Preliminary Study On Several Key Factors Affecting Seismic Performance Evaluation Of Multi-storey Frame Structures

In this paper,a simplified method for evaluating the earthquake resistance of a multi-storey frame building is proposed in this paper,which is used to evaluate the earthquake resistance of a multi-storey frame building.The force ratio is the core concept for evaluating the overall seismic performance of the structure.It has the advantages of clear physical concept,quick and concise,quantifiable and maneuverable.The work done in this article is as follows:(1)The seismic structure characteristics and earthquake damage characteristics of the frame structure are analyzed,and the main factors affecting the seismic capacity of the frame structure and their influence laws are studied by summarizing a large number of examples of engineering earthquake damage.(2)The concept of resistance ratio used to characterize the seismic capacity of multi frame structures is proposed.Based on the bottom shear method in the code for seismic design of buildings(GB50011-2010)and the formula for calculating the shear capacity of various components,the formula for calculating the resistance ratio is derived.The formula contains the total number of buildings and the strong seismic fortification.Factors such as degree,thickness of infill wall,concrete strength,reinforcement strength and mortar strength.(3)Based on the ABAQUS software,six models with the consideration of the structure layer and the seismic fortification intensity are established,and the modal analysis and static elastoplastic analysis are carried out.The influence of the number of layers and the seismic fortification intensity on the seismic capacity of the multi-storey frame buildings is studied,and the regression fitting is made to the consideration of the number of layers and the seismic fortification intensity in the formula.The formula of positive coefficient is given,and a simplified formula for calculating the resistance ratio of multi-storey frame buildings is finally given.(4)Selecting 8 storey frame structure office and an example of 5 storey frame structure office building in a certain area to carry out the two level appraisal method in the current specification.The 8 storey frame structure and the 5 storey frame structure are identified by the simplified formula of the resistance of the multi-storey frame structure.Compared with the existing identification methods and the results of the method proposed in this paper,the correctness and effectiveness of the simplified method for evaluating the seismic capacity of the multi-storey frame buildings proposed in this paper is verified.