Browsing by Author "Vitharana, TVDVK"

Now showing 1 - 3 of 3

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.
item: Conference-Abstract
Performance of concrete-filled double-skin circular steel tubes in compression and its application in buildings in Sri Lanka
(Department of Civil Engineering, University of Moratuwa, 2021-11) Vitharana, TVDVK; Baskaran, K; Hettiarachchi, P
In this research, an attempt has been made to check the feasibility of using concrete-filled circular double skin steel tubes in buildings in Sri Lanka in terms of performance. Concrete-filled steel tubes (CFST) are becoming a new trend in the construction industry. CFST is a component with good performance resulting from the confinement effect of steel with concrete and design versatility. Concrete filled double steel tube is a composite construction component that consists of two steel layers embedding a concrete layer in between and the inner hollow steel section acts as formwork and reinforcement for the concrete. CFDST has many advantages such as high strength, high bending stiffness, good seismic and fire performance. Columns are designed to resist the majority of axial force by concrete alone can be further economized by the use of thin-walled steel tubes. The study about the behaviour and construction of CFDST columns is a prime need. Moreover, this type of structural member has not been used much in Sri Lankan conditions and hence it is vital to investigate further these sorts of structural elements. This research presents a detailed investigation on how CFDST columns behave under axial compression by experimenting on three concentrically loaded columns with three varying diameters. In terms of the failure, global buckling can be seen when the slenderness ratio is higher and the column with the least slenderness ratio demonstrated global buckling along with local buckling which was localized to the top end of the specimen. The test results were verified by analysing the structural element using ABAQUS finite element software and further validated by using a design standard. Finally, this research discusses the feasibility of using CFDST columns in buildings in terms of seismic performance.
item: Conference-Full-text
Study on concrete-filled double-skin circular steel tubes under axial compression
(IEEE, 2022-07) Vitharana, TVDVK; Baskaran, K; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
In this research, an attempt has been made to evaluate the performance of concrete-filled double-skin circular steel tubes (CFDSCT) under axial compression and their application in buildings in terms of performance. Concrete-filled double-skin steel tube (CFDST) is a composite construction component. It consists of two steel layers with concrete sandwiched in between the tubes. The inner hollow steel section acts as formwork and reinforcement for the concrete. CFDST has numerous advantages, which include high strength, high bending stiffness, and good seismic and fire performance. Moreover, this type of structural member is not being used largely in construction, hence it’s vital to investigate and obtain a clear analysis of the implementations. This study presents a detailed investigation of how CFDSCT columns behave under axial compression, by experimenting and further verifying it through analysis of the structural component by developing a numerical model using “ABAQUS” finite element software. The experimental results were further compared to theoretical calculations performed using the “Eurocode 4” design standard. The simulation and the theoretical data are in good compliance with the test results. Ultimately, using a numerical model developed with SAP2000 software, this study discusses the feasibility of using CFDST columns in buildings in seismic performance.