Diagonal Strut Mechanism of Urm Wall Built in RC Frames for Multi Bays

Abstract eng:
The authors have studied the in-plane seismic performance of one-story, one-bay RC frames with URM wall, and investigated the failure mechanism forming a diagonal strut in the walls. They discussed a simple approach to evaluate the lateral resistances of infill walls. The objectives of this study are to clarify the in-plane and out-of-plane behaviors of infill walls, and to propose a reinforcing system to prevent the infill walls from out-of-plane failure. The current paper reports on in-plane cyclic static tests on one-story, one-bay and one-story, two-bay specimens representative of Turkish RC moment resisting frame models infilled URM walls, and investigates the lateral force resisting mechanisms of the infill walls using an experimental method to identify the diagonal compressive strut formation. Based on the results of the tests, the following major findings were obtained. (1) The proposed method of evaluating an equivalent diagonal strut based on the strain measurements can accurately estimate the wall strengths for the 1 bay and 2 bay specimens throughout the loading cycle. (2) Two independent diagonal struts were formed in the 2 bay specimen. This result supports the effectiveness of analytical modelding by single strut replacement for infill in multi-bay farmes. (3) The FEMA procedure underestimated the lateral strengths of both specimens.

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