Seismic Performance Of Frame Structure Considering Connection Influence Between Infilled Wall And Frame

Infilled frame structure is convenient to design and construct, and it has flexible space layout and large interior space, therefore it is widely used in multi-storey commercial office buildings, hospital buildings, school buildings and residential buildings. But earthquake damage, especially the Wenchuan earthquake damage, shows that unreasonable connection between filler wall and frame will cause the destruction of the frame, even collapse, which lead to heavy casualties and property damage, thus the connection has drawn attention in some researchers.Code for Seismic Design of Buildings in China suggests that Infilled wall should be separated or connected flexibly with column. But there is no unified norm clarify what the extent of connections should be and in what procedures they should be built. The influence of connection, between filler wall and frame, to structural seismic performance is focused in the dissertation. Different connection stiffness and different connection ways are designed in finite element model. The main research works are as follows:(1)ABAQUS is adopted to simulate the pseudo-static test in literature. Cracking load and cracking displacement of infilled wall, damage features of structure and hysteretic curve are compared to verify the reliability of finite element model.(2)The finite element models of the frame structure without infilled walls and the frame structures connecting infilled walls with different stiffness and different ways are established in ABAQUS. By comparing the results of modal analysis and empirical formula, it is found that infilled wall has great influence on structural natural periods, which means involving the consideration of the influence of infilled walls in structure analysis is necessary. And the differences in connection stiffness only have small influences in the structural frequencies and mode shapes, the structure shows same dynamic properties in those situations.(3)By analyzing the elastic-plastic time history of the structures, including structures with or without infilled walls, under frequent earthquake and rare earthquake, the results shows that infilled walls have relatively large influences on structural stress, deformation and failure characteristics. This further verify the necessity of the consideration of infilled walls in frame structure analysis.(4)This dissertation analyzes the elastic-plastic time histories of the structures, Adopting different connection stiffness under frequent earthquake and rare earthquake, and the seismic performance of the structures with different connection stiffness is studied by comparing acceleration response, interlayer displacement angle, seismic damage characteristics of frames and infilled walls, the results show that reasonable connection stiffness could improve seismic performance of structure; In the case of this dissertation, the structure shows a good seismic performance when it adopts 75% connection stiffness between infilled wall and frame.(5)Basing on the results above, the elastic-plastic time histories of the structures with different connection ways are further analyzed under frequent earthquake and rare earthquake; By comparing acceleration response, interlayer displacement angle, damage characteristics of acceleration response, interlayer displacement angel, damage characteristics of components and structure, the seismic performances of the structures with different connection ways are studied This shows that reasonable connections ways between infilled walls and frames can improve structural seismic performance. In the case of this dissertation, constructional column and horizontal beam between filled wall and frame contribute to a better seismic performance.The researches in this dissertation will provide some references to frame structure design in choosing reasonable connection stiffness and connection ways between infilled walls and frame.