Study On The Performance Of Infilled Subjected To In-plane And Out-of-plane Loading

In recently years it is indicates that infilled is easy to be damaged , collapsed and even be thrown out the plane in the earthquake ,which caused economic loss and people's casualty,moreover, hindered the rescue routes of post seismic.Therefore, the people more and more regar the seismic security of infilled, especially,it is eagerly waiting for studying under out-of-plane loading.This thesis based on the research results of home and abroad about in-plane and out-of-plane mechanical behavior of infilled , and combine with the relevant provisions of domestic and international codes of infilled, have done some research as follows:(1) According to the earthquake damage of infilled, summarize the provisions of domestic and international codes of infilled, analyzeshortage of specifications for the infilled, to get the maximum length to thickness ratio and the maximum thickness ratio of infilled which needn't to check bearing capacity for wind and seismic. And associate with the study on the performance of infilled at home and abroad, get the constrained boundaries, high-thickness ratio and the compressive strength and so on,they are the sensitivity factors of infilled out-of-plane mechanical behavior.(2)Under out-of-plane loading infilled model were set up,including different constraints boundaries,different height-thickness ratio and different compressive strength of masonry, do linear and nonlinear analysis, to study these factors'influence in the out-of-plane behavior of infilled, analysis of these factors limits in theoretical method, and evaluate the seismic performance of infilled under the these factors. Finally a reasonable form of boundary constraints, height-thickness ratio limit,and the compressive strength limit of masonry when infilled subjected to out-of-plane loading are got.(3) Pure frame and infilled frame structure model were established,then carry out non-linear finite element analysis under in-plane loading and out-of-plane loading, to study the infilled impact on main structural when onerall structure subjected to in-plane and out-of-plane loading. Meanwhile, compare and evaluate the seismic performance of the infilled frame structure under both Conditions. The results showed that: under the in-plane forces, the infilled has favorable impact on the main structure, which are consistent with the existing experimental and theoretical result; under the out-of-plane forces,infilled with a negative impact on the main structure, reduce the bearing capacity of overall structure, stiffness and ductility; under the out-of-plane forces, infilled frame capacity is weaker, ductility is samller .The results of this article provided theoretical support for our codes in seismic designing of infilled wall under out-of-plane loading. Improved the effect of infilled on the overall structure, provided the valued reference for anti-earthquake design of infilled wall.