Structural behaviour of steel fibre reinforced concrete wall panels in two-way in-plane action

摘要

The effect of steel fibres on the strength and behaviour of reinforced concrete wall panels in two-way action is reported in this paper. Of the thirty-two wall panels 16 were reinforced normal concrete (NC) without steel fibres and the remaining 16 panels were with steel fibres. The panels were subjected to a uniformly distributed vertical load applied at a small eccentricity of t/6 to simulate a typical wall under load. The variables of wall panels considered in this study were (i) slenderness ratio (SR) (viz. 12, 15, 21, and 30) and (ii) aspect ratio (AR) (viz. 0.75, 1.07, 1.50, and 1.875). Straight steel fibres having diameter 0.38 mm and aspect ratio 60 were used. The volume fraction of steel fibre was 0.50%. Incorporating steel fibres improved the cracking behaviour. Comparing experimental values of ultimate strength with those computed using the methods proposed by other researchers gave differences, which were not acceptable. Therefore, the study necessitated proposing a new method to improve the prediction of the ultimate strength of SFRC wall panels in two-way action. The computed values of ultimate strength using the new method compared well with the experimental values.