Browsing by Author "Jayasinghe, MTR"

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item: Thesis-Abstract
A Study of behaviour of high rise buildings with transfer level under dynamic loading
Jayasundara, TJ; Jayasinghe, MTR
Earthquake resistant structures are not mandatory in countries located away from earthquake prone zones such as Sri Lanka. However after the occurrence of 2004 Tsunami, and considering possible environmental changers and recently observed small scale ground motions, it is advisable to consider Sri Lanka as low seismic zone. With the current trend of "Mixed Development Concept" high- rise buildings with transfer plates are common form in the vicinity as far as apartment buildings are concerned. The consequences in an event of an earthquake can be serious or even fatal for this type of highly irregular buildings and adoption of earthquake detailing alone would not adequate. Therefore, approach is needed in order to enhance the earthquake resistance at the conceptual design stage. This study has been carried out in order to identify the effects on the seismic performance of the building when the level of the transfer plate changes. Accordingly, five number of thirty five storied apartment buildings with transfer plate located at different levels were considered in the analysis. It is observed that building codes provide criteria to classify the vertically irregular structures and suggest dynamic analysis to arrive at design lateral forces. In this context, the buildings under this study were subjected to response spectrum analysis according to the design spectrum given in the UBC 97. Computer simulation has become an efficient tool in the analysis of structures under extreme loading. Therefore, three dimensional computer models generated with the help of SAP 2000 were used in this study. The transfer floor was located at the tenth floor level of the thirty five storied building as the first case. The analysis was repeated by changing the level of the transfer plate to below and above the tenth level. Results obtained for buildings with transfer plate located at different levels were compared. From the comparison of Response Spectrum Analysis results of this study it , was found that, when the level of the transfer floor moves towards the ground it enhances the earthquake resistance of such buildings. Further, it was found that the variation of the base shear, maximum absolute accelerations, maximum absolute displacement and the inter story drift is marginal with respect to the change in level of the transfer plate for this particular building.
item: Conference-Extended-Abstract
A Study on present situation, construction procedures, sensitivity towards the fill height and possible failure scenarios of corrugated soil-steel bridges using PLAXIS
(2010) Gunathilaka, WMS; Shanaka, KBK; Lewangamage, CS; Jayasinghe, MTR
The Southern Highway Project introduced the technology of using Soil-Steel Bridges to Sri Lankan construction industry for the first time. Because of the fact that the technology is still new and less familiar, therefore, it is very important to look at the suitability of the Soil-Steel structures in the Sri Lankan context. The corrugated Sail-Steel Bridges hare been used as underpass and drainage structures in the Southern Highway Project. Corrosion of the metal structure highly depends on the soil types and the ground water conditions of the region where the structure is to be constructed. Already constructed soil-steel structures were closely examined in-order to collect the information on corrosion The loading and unloading procedures given in the guidelines are questionable and there is a need to establish proper guidelines for loading and unloading process for the safety during construction and while the structure is functioning. The actual construction sequence followed in the soil-steel structure construction was modelled using Finite Element Computer Modelling and the stresses and deformations of the structure were obtained. The stresses of the steel structure under different fill heights and the HA loading was also modelled using Unite element computer modelling: Using FEM model, possible failure scenarios n ere identified.
item: Conference-Extended-Abstract
A study on structural behaviour of corrugated soil-steel bridge structure (long span) in Southern highway for different depth of soil cover
(2010) Shanaka, KBK; Gunathilaka, WAS; Lewangamage, CS; Jayasinghe, MTR
Corrugated Soil-Steel Bridges have been used as underpass and drainage structures in the Southern Highway Project. This design and construction process is novel to the Sri Lankan context. The Ring Compression theory, which is based on two dimensional plain strain idealizations, has been used in the design of the structures. However due to the presence of the ring walls, the effect of uneven loading in the longitudinal direction due to load combinations of HA and HB loads, these assumptions are in question. The maximum and minimum depths of soil covers have been defined according to the results obtained by the Ring Compression theory. The effects of depth of cover in Soil-Steel bridges were evaluated using finite element computer modelling according to the US 5400 The original design results and the results of finite element analysis were compared. The structural stability of the existing bridges with respect to the different fill heights was determined. The Ring Compression and Finite Element Methods results are compatible for higher depth of covers The stresses of the steel structure for defined maximum and minimum depth of cover, at the ultimate limit state conditions are less than the crushing strength of the steel. Butt further buckling analysis should be considered because the corrugated steel structure vulnerable to buckling failure
item: Conference-Abstract
Adoption of precast hollow core panels for external walls of multi-storey buildings
(Department of Civil Engineering, Faculty of Engineering, University of Moratuwa, 2022-12) Subakaran, R; Jayasinghe, MTR; Herath, HMST; Mallikarachchi, C
Precast hollow core wall panels have gained popularity for their efficient use as load-bearing and non-load-bearing wall elements. ICC ACOTEC hollow core wall panels are manufactured locally and intended to be used as internal partition wall panels in multi-storey buildings. Partition walls in general are not load-bearing elements, thus they do not undergo significant deformations. This research study focuses on verifying the usability of such precast panels as external wall panels in multi-story buildings, where their load resistance is investigated under lateral wind loads and vertical deformations due to column shortening effects. In addition, using the shape optimisation technique in-built into ABAQUS/CAE advanced finite element software and parametric optimisation study, a better layout for the precast wall is also proposed and its performance is compared with the current standard layout under similar loading and boundary conditions. The numerical model was validated using experimental test results and the optimised panel has a 16% lower net volume than the original hollow panel. Meanwhile, the optimised panel did not show any reduction in strength properties and does not pose any challenges in manufacturing. Using shape-optimised panel sections, panel assemblies are simulated to investigate the panel assembly response under wind loads. Further, recommendations are given on the maximum number of wall panels that could be installed as a single assembly under different wind load intensities at various heights of multi-story buildings. Considering practical aspects, these recommendations are integrated with proposals on connection mechanisms between panel assemblies. Due to the nature of the scope of this research study, long-term effects such as creep and fatigue were not incorporated, and it is recommended to conduct experimental tests for the proposed panel assemblies before practical usage.
item: Conference-Abstract
An experimental study on flexural strengthening of reinforced concrete beams using externally bonded FRP
(2010) Perera, PDR; Jayasinghe, MTR; Lewangamage, CS
The strengthening technique of Ffiber Reinforced Polymer (FRP) bonding externally is now established as a simple and convenient repair method for enhancing the flexural performance of concrete beams. In order to increase the stiffness and the flexural carrying capacity of beams under specific service conditions, FRP bonding has become very effective method. This paper presents the structural performances of FRP bonded beams. Experiment was conducted to find out the flexural strength increment which can he obtained by bonding F RP externally and identified the deflection pattern am! failure modes.
item: Conference-Full-text
Analysis and design of telecommunication towers for earthquake loading in Sri Lanka for sustainability
(2013-11-12) Gunathilaka, AMLN; Lewanagamage, CS; Jayasinghe, MTR
Large number of telecommunication towers has been constructed in Sri Lanka during last few decades with the rapid development of telecommunication sector in the country. These towers play a significant role especially in wireless communication and failure of such tower in a disaster like an earthquake is major concern mainly in two ways. One is the failure of communication facilities will become a major setback to carry out rescue operations during disaster while failure of tower will itself cause a considerable economic loss as well as damages to human life in most of the cases. Therefore, design of telecommunication towers considering all possible extreme conditions is of utmost importance and a good design can be considered as a step towards a greater degree of sustainability. However, almost all telecommunication towers in this country have not been checked for earthquake loading since most of people believe that earthquake threats are not that much of significance to Sri Lanka until recently. With many tremors recorded in recent past, designers have started to rethink about earthquake design of structures and main objective of this research is assessing the performance of exiting towers (which were not initially designed considering earthquake loading) under possible earthquake loading and find cost effective strategies for retrofitting in case such action has to be effected. Accordingly, behaviour of existing four legged Greenfield towers under seismic loadings appropriate for Sri Lankan conditions were analyzed using equivalent static load method given in ANSI/TIA-222-G. This can be considered as an initiative in this research area under local conditions. Results and conclusions based on this analysis are discussed in this paper.
item: Thesis-Abstract
Analysis of elevated water retaining structures using finite element method
Rupasinghe, SKLS; Jayasinghe, MTR
In water supply schemes, concrete structures are used to store the required quantity of water for distribution for an area. In the case of design of these structures, a precise and accurate analysis is considered as a significant issue. Especially in elevated towers such as Intze Tanks, Conical Tanks and Cylindrical Tanks, the membrane shell theory is used extensively in analyzing those structures. The Intze tanks prove to be economical for storing medium and large capacities. It is useful to analyze these structures to obtain a cost effective solution. In most of the structures mentioned above have hoop tension as critical in many parts of the structures due to the water pressure on the sections. Therefore, reduction of hoop tension of the structure is important to reduce the requirement of reinforcement in the particular section. In the research, the elevated structures were analyzed by using the membrane theory. Also the structures were modeled using the Sap 2000 software to compare the results of shell theory with computer modeling. The aim is to investigate the potential for optimization. In this research, the Intze type structures were modeled and analyzed by using the finite element analyzing (FEA) software to check the difference of results between Shell theory and FEA at different locations. The model has shown that the membrane moment and forces obtained from the Finite Element Analysis was considerably lower than the results that have been obtained from manual calculations at certain locations. According to the FEA results, the membrane forces are low in the sections of cylindrical wall, conical bottom and supporting shaft. In order to assess the benefits of more accurate analysis, the structure were redesigned by using the results obtain from FEA to calculate the benefit of cost in finite element analysis& design. A cost analysis was performed to quantify the cost advantages.
item: Conference-Abstract
Analysis of four leg telecommunication towers for seismic loading using response spectrum method
Gunathilaka, AMLN; Lewangamage, CS; Jayasinghe, MTR
Telecommunication towers are common sight even in very remote areas of Sri Lanka with the revolutionary development in this sector during last few decades. These towers play a vital role especially in wireless communication. Hence, a failure of such tower in a disaster like an earthquake is a major concern since it hampers communication needs in rescue operations during the disaster. Further, since these are usually tall structures, failure of tower may itself cause a significant damage. However, almost all existing telecommunication towers in this country have not been checked for seismic loading since Sri Lanka was considered as a country free from earthquakes until recently. But, now most of the structural engineers consider seismic effects for their designs of important structure such as high rise buildings, dams, etc. Still, this practice has not been implemented regarding telecommunication tower designs. This paper discuss the structural performance of selected existing four legged Greenfield towers which were analyzed under seismic loadings using Response Spectrum method given in ANSI/TIA-222-G. Approach of analysis and comparison of analytical results under different seismic analytical techniques as well as with results under wind loading are presented in this paper.
item: Thesis-Abstract
Applicability of suspension bridges for transportation in rural areas in Sri Lanka
Thrimavithana, RSK; Jayasinghe, MTR
For the rapid economic development of rural villages in Sri Lanka the transportation facilities should be upgraded. In this context, one of the bottlenecks is the need of large number of bridges which is a costly item. Therefore the solution given at the moment is the provision of pedestrian suspension bridges, which can be used only for passengers. Almost all the suspension foot bridges available might not withstand dynamic forces such as wind induced dynamic forces and human induced dynamic forces. The biggest issue on these bridges is the safety. For these locations the development of a suspension bridge that can handle both human and cycles loads safely, will be a great advantage. These structures however are always lively with low stiffness, low mass, low damping and low natural frequencies./ A conceptual study has been carried out to investigate the dynamic characteristics of slender suspension foot bridges under human induced dynamic loads. As the first step, some places where suspension foot bridges are located were visited. While crossing the bridge, during the site visit it was felt that those existing bridges are not comfortable and identified as low safety. Different types of suspension bridges and different structural models were observed. Then existing suspension foot bridges were modeled using both software PROKON (V-2.1) and SAP 2000 (V9.3). Under the first step it was tried to introduce different modifications to existing bridges to satisfy comfort and more structural stability with safety. Since these bridges are having low structural factor of safeties, no modifications are allowed.
item: Conference-Abstract
Application of load bearing cement hollow block walls for multi storey housing
(Department of Civil Engineering, University of Moratuwa, 2024) Wijayarathna, YADKH; Jayasinghe, MTR; Pasindu, HR; Damruwan, H; Weerasinghe, P; Fernando, L; Rajapakse, C
The economic challenges facing Sri Lanka have highlighted the need for affordable housing solutions. This study investigates the viability of load-bearing hollow block walls within a hybrid construction system for multistory residential buildings, utilizing precast slab panels and concrete hollow blocks as lightweight construction materials. The study aims to redefine traditional construction practices and propose an economically viable approach. Structural analysis was conducted using the “Manual for the Design of Plain Masonry in Building Structures to Eurocode 6”, to evaluate the load-bearing capacity and structural integrity of the hybrid system across varying building heights (three to eight stories). Two alternative wall configurations were assessed: (1) walls supporting simply supported beams that carry slab panel loads, and (2) walls directly supporting slab panels. The concrete hollow blocks used are standardized at 200 mm x 190 mm x 390 mm with 47% voids, and the height of wall panel is 3 m with a thickness of 200 mm. The block density is 22 kN/mm², with the mortar strength being 4.0 N/mm². The study showed that the wall configuration of Alternative 2 requires less block strength while maintaining efficient load-bearing capacity compared to Alternative 1 for buildings up to eight stories. Additionally, the Alternative 2 configuration can be applied to buildings up to six stories without needing additional frame support. For buildings with up to three stories, both wall configurations were found to be feasible under the current allowable block strength of 8 N/mm². Moreover, the block strength requirements for buildings up to eight stories using Alternative 2 were determined to be within the achievable limits of current manufacturing practices. This study contributes to the growing body of knowledge aimed at enhancing sustainable construction practices in the region. It offers a practical pathway for structural engineers to meet the increasing demand for affordable housing in urban areas while promoting sustainability of the construction industry. Furthermore, the findings emphasize the potential of using precast slab panels and hollow blocks to enhance the efficiency and sustainability of housing projects. Further exploration of the application of this hybrid system in seismic conditions is recommended as additional reinforcement measures might be necessary to ensure safety and durability under seismic loads. Also, it is recommended that methods to improve the strength of hollow blocks be explored further, particularly for taller structures. Adopting this innovative approach could significantly contribute to meeting Sri Lanka's urgent demand for affordable housing while promoting sustainable construction practices.
item: Conference-Full-text
Applications of high strength concrete in highrise buildings
(Engineering Research Unit, Faculty of Engiennring, University of Moratuwa, 1997-11) Jayasinghe, MTR; Jayanandana, ADC; Alwis, KGNC; Hettiarachchci, P
High strength concrete can be used in high-rise buildings to minimise the size of columns, especially in the lower floors. High strength concrete has the added advantage of a higher elastic modulus that can reduce the deflection. It also has a lower specific creep that makes it possible to use higher stresses associated with high strength concrete. It is shown by a case study that the use of high strength concrete can reduce the cost of construction in Sri Lanka with the currently prevailing prices of concrete and steel. There is also the added advantage to the owners of the building in getting a higher rentable area resulting from reduced member sizes. The use of slender members can make the structure more flexible. However, it is shown that the use of high strength concrete in columns will not adversely increase the wind induced accelerations of the building since the reduction in column size is compensated by the higher modulus of elasticity.
item: SRC-Report
Applications of neural networks to produce optimum designs
Jayasinghe, MTR; Jayawardane, AI
item: SRC-Report
Applications of neural networks to produce optimum designs
Jayasinghe, MTR; Jayawardane, AI
An artificial neural network can be considered as an information processing system where the architecture essentially mimics the biological system of the brain. A neural network consists of a number of interconnecting processing units referred to as neurons. Each of these connections has numerical weights associated with them. These weights determine the nature and strength of the influence between the interconnected neurons. The neural network can be trained by using a suitable set of data. The trained network can be tested for its performance. When the performance is adequate, the net can be used to make predictions for new cases. Neural networks have been successfully used in many disciplines on engineering such as in many civil engineering applications (Goh, 1994), prediction of pile capacities (Chow et al., 1995), Multi-objective and multirecourse decision support systems (Wei & Singh, 1995), Control systems (Macnab & D’Elenterio, 1995) etc.
item: Conference-Full-text
Assessing the cracks developed in Dematamal Viharaya, Butthala
(Department of Civil Engineering, University of Moratuwa, Sri Lanka., 2011-12) Jayasinghe, MTR; Paskaran, S; Perera, TM; Kumara, D; Ratnayake, N
Stupas of Sri Lanka stand as proud examples for the engineering excellence of ancient Sri Lanka. Dematamal Viharaya at Butthala is one of the oldest stupas in Sri Lanka built in the 2nd Century BC which is a, 19m tall non-plastered brick structure. This stupa has developed cracks since 1998. Cracks have initiated from the pesawalalu and propagate to the top of the dome. The research covered in this report is aimed at the identification of the A comprehensive study was carried out to identify the possible causes for the cracks which may be due to self weight and shape of the stupa, expansive nature of soil, arch action induced due to separation of old and modern masonry. Experiments were done to assess the expansive nature of the soil and a Finite element analysis was carried out using the Finite element software SAP2000. The results revealed that the possible cause may be the arch action induced due to separation of old and modern masonry.
item: Conference-Full-text
Behavior of reinforced concrete columns confined with CFRP (Carbon fibre reinforced polymer)
(2013-11-11) Rankoth, CK; Lewangamage, CS; Jayasinghe, MTR
In modern world the retrofitting of structures is promoted rather than demolishing and reconstruction of deteriorated structures.Attentionhas also given to increase the load carrying capacity of existing structures to increase the usage capacity or to change the intended usage. Retrofitting of structures using Carbon Fibre Reinforced Polymer materials is accepted as a sustainable and effective method comparatively to most of other well-known methods like steel plate bonding and external post tensioning. This paper presents anexperimental study carried out to understand the effectiveness of external CFRP confinement for square reinforced concrete columns and validation of ananalytical stress strain model,using experimental results. Four reinforced concrete columns, one control specimen without external confinement and three specimens with full external confinement were tested for compression to monitor the strength gain against axial loading. The results showed a considerable increase of the axial strength, about 50% and improved ductility, up to about 20% for the columns with external confinement. The analyticalstress stain modelpresented anacceptable agreement with obtained experimental results.
item: Conference-Abstract
Cellular pile raft foundations for lightweight multi-storey buildings
(Department of Civil Engineering, University of Moratuwa, 2024) Sandamal, NGTM; Jayasinghe, MTR; De Silva, LIN; Pasindu, HR; Damruwan, H; Weerasinghe, P; Fernando, L; Rajapakse, C
The global demand for housing and urban land scarcity has driven the need for multistorey buildings. The substructure design plays a crucial role in ensuring the stability of these structures, as traditional foundation methods, like piled or piled raft foundations, are essential for distributing the substantial loads. However, the high costs associated with these systems have prompted the e ploration of alternative foundation designs This study’s approach seeks to optimize foundation construction by reducing costs without compromising structural integrity, making it a viable solution for sustainable urban development. This study investigates the feasibility of employing a raft foundation, particularly a weight-compensated cellular raft design for multistorey buildings exceeding 10 floors which typically require costly pile foundations. Unlike traditional piles, Backhoe loaders are proposed for constructing piles filled with Aggregate Base Course (ABC) with cement and inserting reinforced columns for anchoring the cellular raft. The strategy involves settling the building slightly to mobilize the soil capacity, particularly for sandy clay soil conditions. Furthermore, the study explores the potential of lightweight superstructures to significantly reduce construction costs by optimizing structural weight and eliminating the need for pile foundations. Specifically, it explores the utilization of Expanded Polystyrene (EPS) based lightweight panels and precast prestressed concrete beam systems with precast prestressed concrete slabs. Investigating a 10-story reinforced concrete moment resisting frame (MRF) supported by a cellular piled raft foundation, the research employs a direct approach considering soil-structure (SSI) interaction effects. Through construction stage analysis using finite element software (Midas GEN, Midas GTS NX), the study determines optimal gap sizes for the cellular raft and assesses the maximum number of storeys feasible without pile foundations. Overall, this study suggests that on sandy clay soil, constructing taller buildings with a maximum of 14 floors, in addition to the cellular basement, is feasible using lightweight superstructures in conjunction with cellular rafts. Moreover, the research recommends increasing pile spacing beyond the current 5m x 5m grid configuration to fully mobilize soil capacity. Future studies should also investigate the effectiveness of these foundation systems across various soil types, including silty clay, loamy soil, and sandy loam, to further validate the design's applicability in different geological conditions.
item: Thesis-Abstract
Comparative analysis o n simply supported pre- stressed box beams in Sri Lankan highway bridges
(2014-08-22) Jabbar, MARMA; Jayasinghe, MTR
The National Road network of Sri Lanka consists of 4326 bridges. There are 365 bridges which Have the length more than 30m .Only 800 bridges are made of prestressed concrete superstructures and all others are with reinforced concrete, steel and arches. The most popular types of prestressed beams used in Sri Lanka are inverted T, M, I, and the box beams. The inverted T and M beams are widely used. Further, for 30m span simply supported bridges, space rectangular box beams and spaced trapezoidal box beams were used. For the continuous bridges big spine beams also have been used with post tension pre-stressing system in recent bridge constructions. For longer span bridges, box beams are highly suitable. Generally box beam has higher torsional capacity because of its closed geometry. The enhanced torsional stiffness of the box beam sections improves the load distribution properties for the superstructure. It has higher bending carrying capacity and requires reduced beam height compared to other beam section for a particular span. Hollow spaces in box beams can be used for services and it is also aesthetic. In Sri Lanka 19% of the existing bridges are with prestressed concrete and presently many highway projects are under construction. Therefore, the usage of box beams will improve the effect on the time of construction, cost, construction easiness, aesthetic considerations and utility services. There are different types of box beams available that can be used for this simply supported span range. They are standard box beam, standard U beam and spaced box beams. The rectangular spaced box beam has been used for a two lane bridge in a 30m simply supported span and the trapezoidal spaced box beam has been used for a four lane elevated flyover in Sri Lanka. Comparative analysis and design on all these box beams are useful for future bridge constructions. This research is concentrated on the design of 30m simply supported four lane bridge super structures using the above different types of prestressed box beams separately. The results of analysis and design and the properties of the beams are compared. The total width of the designed bridges is 17.4m. It has a central reserve of 1.2m. There are four lanes; each lane is 3.5m width. There are two pedestrian walk ways of 1.1m width. All the bridge decks were modeled in SAP 2000 for the grillage analysis. Loading was done according to BS 5400: Part 2, 1978, and bending moments, shear forces and torsional moments were found for critical load combination. Prestressing designs were carried out for all beams and the final results are compared. Cost for each deck also compared. The different launching methods adapted for these Bridges are also compared. Conclusions and recommendations are laid down based on these compared results.
item: Article-Full-text
A comparative embodied energy analysis of a house with recycled expanded polystyrene (EPS) based foam concrete wall panels
(Elsevier, 2017) Dissanayake, C; Jayasinghe, C; Jayasinghe, MTR
The building industry has consumed a vast amount of natural resources and also been responsible for a significant energy usage. This is expected to increase further with economic development where more people will need quality housing. Therefore, any building material that minimizes the usage of natural resources or use waste materials to a certain extent could have a promising future. Such a novel walling system has been considered in this study, which uses 50% of recycled expanded polystyrene (EPS) to produce lightweight foam concrete panels. A detailed study was carried out to determine the embodied energy of those panels. A comparative study carried out using a typical single storey house and different building materials indicated that the foam concrete precast panel can be a good competitor and hence has the potential to be promoted as a mainstream walling material.
item: Thesis-Abstract
Comparative study on simply supported pre-stressed box girders and double T beams for Two lane highway bridges
Wijendra, WSN; Jayasinghe, MTR
There are about 3800 bridges on National Road Network with length varying from 3.0 m to 300.0m.These bridges have varying widths about 3.0m to 20.0m and some of these have been constructed more than 50 to 100 years back. Most of the bridges span 30m and above. They were constructed using steel concrete composite or steel. Steel is a very costly material, even though it has some very good structural advantages./ Few bridges have been constructed in the recent past using T,M,Y,I beams in the span around 30m by launching side by side. And this was a very tedious procedure. Aesthetic view of a bridge has been neglected during the past 50 years or more due to the design complexity. Time for completion of a bridge has become an uphill task these days due to the price fluctuation and other constrains such as traffic and utility services./ This study is concentrated on the design of a simply supported 30m pre-stressed post tensioned box girder and comparing the properties and other advantages mainly with the Double T beams. Mainly the geometry of the box girder was selected with the help of past research papers and the geometry of the double T beam was selected where the cross sectional area is approximately equal to the cross sectional area of the box girder. Design of the box girder is done using three dimensional finite element method and the spine beam method. Although the Finite Element method is very versatile and powerful manual, calculations is also done as box girders designs are very rare. As the history of the double T beams arc also very rare, it is also designed using SAP 2000, spine beam, and three dimensional Finite Element methods./ Both beams are analyzed for HA,HB moving loads. Load combinations are considered, dead plus HA live load as load combination 2 and dead plus HB as load combination 3 Shear force, bending moment, tortional moment, support reactions, stresses, amount of tendons were compared. In spite of that, the launching method, capability for utility services were also compared. Conclusions and the recommendations of the study will be laid down based on the results in the study
item: Conference-Full-text
A Comparative Study to Assess the Sustainability of Bamboo Reinforced Concrete over Conventional Steel Reinforced Concrete
(2022-08-23) Vitharana, TVDVK; Bandaranayake, SS; Jayasinghe, MTR; Herath, HMST; Mallikarachchi, HMYC
Amongst various sustainable building materials, bamboo reinforced concrete has come into concern as a potential substitute for steel-reinforced concrete. This has drawn attention due to some major drawbacks of steel in reinforced concrete including elevated cost, high energy consumption, increased emission of carbon, etc. Bamboo is a rapidly renewable material that has displayed outstanding mechanical properties which are adequate to replace steel in reinforced concrete. In the present context, in addition to its structural performance, it is of vital importance to evaluate the sustainability of bamboo reinforced concrete over conventional reinforced concrete. In this work, the structural capacity of replacing steel with bamboo in different structural elements was analytically determined. Subsequently, a comprehensive work study-based analysis was executed to compare the sustainability of a bamboo reinforced concrete beam element with a conventional steel-reinforced concrete beam element in terms of their embodied carbon and cost. Results of this study justify the possibility of promoting bamboo as a potentially sustainable alternative to steel in reinforced concrete as bamboo reinforced concrete displays drastically reduced sustainability indices for embodied carbon, and cost while maintaining adequate structural capacities.