Research On Seismic Performance Of Infilled Wall RCS Hybrid Frame Structure

The RCS hybrid frame structure is a new structural system that combines steel beams and reinforced concrete columns and can fully utilize the advantages of these two traditional building materials.It has been widely used in multi-story large-span industrial buildings and public buildings.At present,there are many researches on RCS structural nodes,and the research on the overall frame structure and the seismic performance of the whole structure considering the infill wall is still more less.This paper analyzes the major earthquake disasters in recent years,collects the experimental data and theoretical analysis of the research on the infilled wall and RCS hybrid structure by domestic and foreign scholars.For the problem that a large number of columns were first destroyed in the earthquake and the structure failed to achieve the "strong column weak beam" failure mechanism required by the specification,This paper studys the seismic performance of the infilled wall RCS hybrid frame structure,including the following contents:(1)The damage process of the infilled wall frame working together and how the infilled wall affects the performance of the frame structure are analyzed.According to the data of a large number of earthquake disasters,the reason for the mechanism failure of the frame structure "strong column weak beam" damage is analyzed.(2)Compare the advantages and disadvantages between them based on the existing infilled wall frame structure simplified model.According to the principle of stiffness equivalent,the equivalent spring bracing model of the infilled wall is established,and the initial stiffness is derived;by simulating a set of existing experiments,it is verified that the simplified model used in this paper is reasonable and correct.(3)Based on a set of three-layer,three-span real-scale RCS hybrid frame pseudo-dynamic tests that satisfy the "strong column weak beam" failure mechanism,the modal analysis and Pushover analysis of the model are carried out by SAP2000 software.Comparing the development of the three-layer pure frame plastic hinge with the experimental results,it is concluded that the two are basically consistent,and the examples selected in this paper are verified to be reasonable and correct,on this basis,the RCS hybrid frame structure model of the infilled wall with different heights of three,five and seven layers is designed.Each model is provided with a pure frame and five different infilled wall arrangements.The seismic performance of the RCS hybrid frame structure after the infilled wall is considered by comparative analysis.(4)The natural vibration period and the cycle reduction factor of each model under different infilled wall layouts and the distribution of plastic hinges under rare earthquakes are investigated.The results show that the addition of infilled walls changes the hinge order of RCS structures,it can improve the bearing capacity of the structure and bring a better stiffness effect and deformation ability to the structure;the bottom weak layer is easy to invalidate the "strong column weak beam" failure mechanism,this is done by changing the stiffness of the infilled wall and suggestions for infilled wall materials that meet the best seismic performance of the RCS structure are given.