Assessment of Shear Capacity of Reinforced Concrete Beam Sections Using Modified Compression Field Theory
No Thumbnail Available
Date
2020-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
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which became outdated.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.
Description
Keywords
Shear, Shear capacity, Modified Compression Field Theory, Concrete