| When studying the collapse performance of frame structure,due to the complexity and uncertainty of infilled walls,scholars usually simplify the frame with infilled walls into a pure frame in the analysis,and then roughly consider the contribution of infilled walls to the structure through the method of period reduction.However,this method cannot accurately reflect the performance of the actual structure.At present,some scholars have carried out studies on the collapse performance of frame with infilled walls,mainly focusing on reinforced concrete frames.However,there are few studies on steel frames and the influence of uneven vertical arrangement of infilled walls on the collapse performance of frames is rarely considered.In this paper,a frame model was established in the SAP2000 finite element software based on the simplified formula for calculating the effective width of bidirectional baroque bars.The Alternate Path method,incremental dynamic analysis method and vulnerability analysis method were adopted.The vertical collapse resistance and lateral collapse resistance of steel frames with infilled walls,the uneven vertical infilled walls arrangement and the influence of different thickness of infilled walls on the collapse performance of steel frames with infilled walls were studied.The main research work is as follows:（1）The formula for calculating the effective width of the bidirectional baroclinic bar in the simplified model of the infilled walls is introduced,and the failure criterion used in the collapse process of the frame structure is analyzed.The model of steel frame with solid infilled wall and steel frame with simplified baroclinic bar was established.The dynamic time-history analysis was carried out,and the vertex displacement and base shear were compared.The correctness of the simplified bidirectional baroclinic bar braced frame was verified,which laid a foundation for the follow-up research.（2）On the analysis of vertical collapse analysis method are discussed by the method of demolition of artifacts,steel frame and dynamic elastic-plastic analysis research pure steel frame and infilled walls plane steel frame in the side column,column,the column failure after failure column node vertical displacement,bottom column axial force,the dynamic responses of the beam bending moment and axial force on the second floor,compared with the result of numerical simulation,The failure mode change of the frame after considering the infilled walls is analyzed.（3）Summarized the principle of incremental dynamic analysis,to determine the structural damage index and the ground motion intensity index,the pure steel frame and steel frame with infilled walls and incremental dynamic analysis on the failure modes of the structure under different ground motion and maximum inter-storey drift ratio of correlation analysis,and respectively to the underlying no infilled walls of steel frame and different wall thickness of infilled walls steel frame is calculated,The factors affecting the lateral collapse resistance of steel frames with infilled walls are discussed.When the bottom without infilled wall,the frame will produce weak layer,more likely to collapse.In the process of building design,the weak layer should be strengthened emphatically,which provides a new idea for the design of steel frame with infilled walls.（4）Based on the incremental dynamic analysis,the collapse performance level and ultimate failure state of steel frame structures are quantified,the formula of vulnerability analysis principle is derived,four damage performance states of steel frame structures with infilled walls are defined,and the vulnerability analysis of steel frame structures with infilled walls is carried out based on performance.The seismic demand model of steel frame structure under the selected ground motion intensity is established,and the probability formula of seismic vulnerability is obtained through the regression analysis of the data,and the collapse reserve coefficient of steel frame is analyzed. |
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