INFLUENCE OF IN-PLANE AND OUT-OF-PLANE INTERACTION OF INFILL WALLS ON GLOBAL COLLAPSE RESISTANCE CAPACITY OF INFILLED RC FRAME

Abstract eng:
Firstly, the model using beam-column elements with fiber discretization to consider in-plane and out-of-plane interaction of infill walls was elaborated. Then, in order to validate the proposed model, a shaking table test model of a 4-storey infilled RC frame was modeled and analyzed via the finite element software, OpenSees. Comparison with the experimental and simulated results indicates that the numerical model considering in-plane and out-ofplane interaction of unreinforced masonry infill walls is valid for modeling the infilled RC frame structure. Then, based on the calibrated numerical model, a three-dimensional model of an infilled RC frame teaching building was established via OpenSees. And static pushover analysis and incremental dynamic analysis under 24 suites of ground motion records were carried out on the model with and without considering in-plane and out-of-plane interaction of unreinforced masonry infill walls. Furthermore, incremental dynamic analysis results were used to evaluate the global collapse resistance capacity of the structure with 50% collapse probability. Analytical results show in-plane and out-of-plane interaction of infill walls has a significant influence on the seismic behavior of the structure. The model without considering in-plane and out-of-plane interaction of infill walls shows obvious degradation. Without accounting for in-plane and out-of-plane interaction of infill walls, the global collapse resistance capacity of the structure will be underestimated obviously.

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