CERS - 2014
Permanent URI for this collectionhttp://192.248.9.226/handle/123/17777
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Browsing CERS - 2014 by Author "Baskaran, K"
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- item: Conference-Full-textComparative study on strengthening methods of steel towers(Department of Civil Engineering, University of Moratuwa, 2014-03) Ganadhiepan, G; Baskaran, K; Hettiarachchi, MTPSteel towers are widely used in the telecommunication and power transmission sectors. Failure of these towers causes direct and indirect losses and disruption to the services provided by those towers. As a result, industries and general public face difficulties and the productivity of the country also gets affected. Considerable number of tower failures has taken place in both power transmission and telecommunication sectors of Sri Lanka in the recent past but only a little amount of studies has been done so far. Testing at least a tower in a transmission line is mandatory in the power transmission sector of Sri Lanka. Generally these tests are carried out at the Structural Engineering Research Centre in Chennai. It has been observed that several towers fail prematurely under normal loading conditions during full scale tests, indicating lack of strength of towers. The objectives of this study are analysing tested towers using finite element method and comparatively studying different techniques of strengthening of towers. A general purpose finite element analysis program SAP2000 was used for the modelling and analysis of towers. Finite element model of a tower which has been tested to full scale was developed and validated in SAP2000. Then different methods of strengthening were carried out to the validated model to comparatively study the effect of each method on the strength of the tower. The findings are presented in this paper.
- item: Conference-Full-textModelling of structural failures in RC beam elements using ANSYS(Department of Civil Engineering, University of Moratuwa, 2014-03) Rokilan, M; Baskaran, K; Hettiarachchi, MTPSimulation of failures using Abstract: laboratory experiments will be expensive and time consuming. To overcome these problems making use of finite element methods and advantages of computational software are key considerations. However, proper simulation of structural behaviour is a key factor in the use of FEM analysis. Worldwide a lot of research studies have given attention in this context but in Sri Lanka, concern on this point is considerably less. This paper contains: identification of type of elements like solid-65 and link-8, material models, boundary conditions and other relevant modelling parameters suitable to model structural failures in RC structural elements using ANSYS. Further it seeks to identify the suitability of discrete modelling of reinforcement model. The initial crack formation, failure load and load-displacement curve of beams from laboratory experiments are compared with the nonlinear finite element models using ANSYS to ensure accuracy of model parameters. The accuracy of model is further checked with mesh density and analysis type by conducting different model analysis by changing the parameters and the observations are reported. This paper concludes simulation of flexural failure can be done using ANSYS by small displacement static analysis (equilibrium equations are constructed based on initial position) or large displacement static analysis (equilibrium equations are constructed based on deflected position). However simulation of shear failure is a difficult task since ANSYS has limitations in modelling shear failure using large displacement analysis or small displacement analysis. Further difficulty to converge a solution can be reduced by large displacement static analysis.
- item: Conference-Full-textPros and cons of using structurally insulated panels in Sri Lanka(Department of Civil Engineering, University of Moratuwa, 2014) Jayathilake, L; Baskaran, K; Hettiarachchi, MTPStructurally Insulated Panels (SIPs) are extensively used in energy efficient buildings all over the world. SIPs can be simply introduced as a building material consisting of an insulating layer in between two structural wythes. Since SIP technology is fairly new to Sri Lanka, only few studies have been carried out to check thesuitability of SIP technology in Sri Lanka. SIPs can be used as walling materials, roofing materials and for slab construction instead of conventional building materials such as burnt clay bricks, cement sand blocks or conventional reinforced concrete slabs. This paper describes an experiment carried out to determine the thermal performance of SIP wall, Cement block wall and Burnt clay brick wall model houses. Further,this presents the results obtained from a computer simulation regarding the cooling loads required for above mentioned models. A cost comparison has been done to evaluate the costs of various wall construction techniques used in Sri Lanka. As a whole, this paper describes pros and cons of using SIPs in Sri Lanka.
- item: Conference-Full-textStudy on waterproofing methods used for concrete slabs(Department of Civil Engineering, University of Moratuwa, 2014-03) Fonseka, R; Baskaran, K; Ekanayake, LL; Hettiarachchi, MTPA building or a structure requires waterproofing, if the building materials are not watertight enough on their own. Therefore, waterproofing has become an essential component of a structure to protect its aesthetic appearance, prevent structural damages and for the safety of the occupants. For concrete slabs, major objective will be to stop the water intrusion into the interior of the building at various locations under various exposure conditions. Accordingly the type and the method of waterproofing required may vary with the location and exposure conditions. In the construction industry, many commercially available materials are used for waterproofing ground slabs, roof slabs and bathroom floors. In this research, field surveys were done to identify the types of waterproofing material, different methods of applications and quality controlling measures regarding to waterproofing. Furthermore, issues related to waterproofing were studied to identify common problems which can be arrived in a functioning building. Then the rectifying methods and their performance related to such issues were also studied. A laboratory test serieswas performed on commercially available waterproofing materials to check their suitability. After applying waterproofing materials ontest specimens, they were checked for water absorption under laboratory conditions for 24 hours. Furthermore specimens with integral admixtures were tested for compressive strength to identify any increase in their compressive strength due to crystalline formation.