Research On Seismic Behavior Of Infill Wall Frames Based On Equivalent Spring Strut

At present, the infilled frame structure is widely used in modern building structure because of the flexible space separation, light weight, and it is advantageous to the earthquake resistance, saving material and so on. Among them, the infilled wall as a non-structural component is often ignored by the designer, that is, the cooperative effect of the filling wall and the frame is not considered in the structural design. Through a large number of earthquake damage investigation, the influence of the filling wall on the frame structure can’t be ignored. Based on the background of the performance based seismic design theory, the severe disaster background of the filled wall frame and the policy background of the promotion of energy-saving, the paper has done the following work:(1) Based on a lot of literature, the paper has briefly described several stages of the infilled wall when the failure as well as the typical failure modes in terms of the theory,summarized the filled wall frame structure of the simplified calculation model. Through analysis and comparison of the advantages and disadvantages of each model, the paper has chosen equivalent diagonal strut which can better reflect the infilled walls under earthquake action by force of the mechanical properties of the model finally.(2) The initial stiffness of the simplified model of the equivalent spring has been derived. Stiffness skeleton curve of equivalent spring strut of two new types of filling wall materials, such as aerated concrete block and concrete hollow block, are established by converting the infilled wall skeleton curve of the former. The finite element analysis software SAP2000 is used to establish a simplified model of the infilled wall frame structure to analyse in pushover method, and the results are compared with the experimental results, provided a better fit.(3) The paper has briefly described the basic principle and steps of static elastoplastic analysis. Based on the Pushover analysis of 4, 7 and 10 layers of three different height RC frame structures, the influence of the filling wall along the height layout on the seismicperformance of RC frame was studied. The law of the influence of different distribution forms on the RC frame structure in the vertical direction have been summarized.