Shaking Table Test Research About The Influence Of Masonry-infilled Wall On The Seismic Performance Of The RC Frame Structures

In recent years, there are a large number of earthquakes occoured in China, and the building’s seismic performance draws more attention nowadays than before. The reinforced concrete(RC) frame structure accounted for a large proportion in China’s existing buildings. Due to its flexible architectural layout, large space advantage, the reinforced concrete structure is widely used for hospitals, shopping malls, schools and other public buildings, thus there is an important practical significance of research on seismic behavior of frame structures.A large number of reinforced concrete structures were found appearing column damage based yield model, in the investigation of structural damage after earthquake. Among them, weakness story at bottom which caused by the uneven vertical infilled walls is a common failure mode, such yield mechanism contrary to the expected "strong column-weak beam" yield mechanism. The infilled wall is an important factor whether framework can achieve "strong column-weak beam" yield mechanism. In this paper, through shaking table test and numerical simulation, in order to analyze the influence which infilled wall brought to frame structure, the main research work is as follows:1. In order to explore the influence which infilled wall brought to frame structure and soft first story at bottom due to uneven vertical infilled walls, two 1:4 reduced-scale models A and B of frame structure were tested on shaking table under different horizontal ground motions.2. After the shaking table test, dynamic characteristics, seismic reponse, crack development process, yielding mechanism and ultimate destroy form of the two models were compared and studied.The results show that: infilled wall significantly increased the initial stiffness and ultimate stiffness of the frame structure, improved the energy dissipation capacity of the frame structure; frame structure with weakness story at bottom was easily damaged; the internal force distribution of frame structure was changed by the infilled wall, which leads to column’s damage.3. Based on the mechanical properties of the material experiment, using finite element analysis software OpenSees, numerical simulation of two test structural was performed. By comparing results of numerical simulation and shaking table test, verified the reasonableness of the finite element simulation method.