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Effect of Cracked Section on Lateral Response of Reinforced Concrete Flanged Beams

By Wakchaure M. R and Varpe Charulata S


Abstract: In an analysis of reinforced concrete structure the flexural stiffness of section is an important parameter and the change in the value of flexural stiffness may result in significant change in analysis result. The current study aims to estimate the reduction in flexural stiffness of reinforced concrete flanged beam sections subjected to lateral loading and take the cracking effect of reinforced concrete section into account. The reduction in flexural stiffness due to earthquake shaking may increase the lateral deflection and it can be significantly greater as compared to deflection estimated using gross flexural stiffness. To take this effect into consideration, the design code of some countries suggest reduction factors or equations to reduce the gross flexural stiffness to effective flexural stiffness but they have some drawbacks because not consider all important parameters in there equation. However in Indian seismic code IS 1893 (2002) and many countries there are no provisions to account for reduction in stiffness due to concrete cracking. Analytical work in present study identified the parameters and influences of these parameters on effective stiffness are determined and suggest the simplified but reasonable accurate expression for computation of effective stiffness of reinforced concrete flanged beam section. Proposed equations can be easily use by designer to estimate the effective stiffness of reinforced concrete flanged beam sections accurately

Topics: Concrete cracking, Deflections, effective stiffness, flanged beam
Year: 2014
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