Assessment of Shear Capacity of Reinforced Concrete Beam Sections Using Modified Compression Field Theory

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Addis Ababa University


The behavior and design of reinforced concrete members subjected to shear remain an area of much concern and investigation. This is particularly due to the less knowledge on shear resistance mechanism of RC structures in one extent and also shear is affected by a number of factors which are not interdependent to eachother. In addition to this many structures were failed due to shear throughout the world. Several researches and proposals were developed for predicting the shear strength of beams in different times by different scholars throughout the engineering world. Most of them were empirical formulations designed to fit the limited set of experimental results for shear. Also different countries adopted design codes based on test results and these codes are continuously changing which necessitates a method that performs further checks on the performance of structures which were designed and constructed based on the previous codes which became outdated. Due to this it is very essential to adopt a theory which forms its basis mainly on the mechanics of members and which gets verified by experimental findings. One of such method is modified compression field theory which is an extension of the compression field theory. It is an analytical model that is largely based on experimental results from University of Torronto by Vecchio and Collins. Particularly, to Ethiopia, where a new code is adopted it is very important to have a tool to assess the performance of structures subjected to shear. So this study presents a tool that can perform shear capacity check based on MCFT using Microsoft visual basic mathematical programming language. The results from the tool are compared with the available codes of ACI and Euro code. With this regard, the shear capacities of all sections obtained by modified compression field theory is greater than that of both the Euro code values and the ACI values as also indicated in previous works of Surafel Tsegaye. Also, the Euro code values are the least values among the three because in Euro code the shear is assumed to be resisted by the shear reinforcements only. On the otherhand for continuous beam sections relatively consistent results were obtained.



Shear, Shear capacity, Modified Compression Field Theory, Concrete