Flexural performance evaluation of slab using welded bar mat

Abstract

ABSTRACT This is an experimental study on flexural performance evaluation when welded bar mats (WBM), which improve the rib shape, strength, and diameter limits of the existing structural welded wire fabric (WWF), are applied to slabs. The purpose of this study was to verify the change in behavior and structural performance when a new material was applied to a structural member. Flexural tests were performed with a total of 10 slab specimens using various variables. The load-deflection relationship and crack patterns of the slab specimens were analyzed to evaluate the applicability of WBM as a structural reinforcement. The results of the structural test were compared with the proposed design formula of the current design standards to check the safety, and the serviceability were verified by comparing the performance with the case of using the conventional rebar. According to the material test results, the yield strength of the steel wires applied to the WBM did not appear clearly, the elastic modulus of the material increased by about 8% compared to that of normal rebar, so that the yield strain and elongation decreased compared to that of normal rebar. When WBM were used for slabs, the nominal strength of the member was found to sufficiently satisfy the design flexural strength. However, as the strength of the material increased, bond failure occurred due to stress concentration between orthogonal steel wires so that deflection and crack concentration phenomena increased.