Analysis of seismic performance of assembled steel structure staggered truss system

Abstract

In order to adapt to the application and development of large-span steel structure, this paper takes a 19-story assembled hybrid staggered truss structure office building as the background. SAP2000 finite element analysis software is used to establish two different forms of assembled steel structure staggered truss system, namely the hybrid staggered truss structure and the vierendeel staggered truss structure. The seismic performance of the structure was analyzed by modal analysis and dynamic elastic-plastic time-history analysis. The main conclusions are as follows: According to the modal analysis of the structure, the directions of the first three modes of the hybrid staggered truss structure are different from those of the vierendeel staggered truss structure. However, the natural vibration period of the two structures gradually decreases with the increase of the vibration mode. The natural vibration period of the vierendeel staggered truss structure is obviously larger than that of the hybrid staggered truss structure, which indicates that the stiffness and quality of the hybrid staggered truss structure are both larger than that of the vierendeel staggered truss structure. Through the dynamic elastic-plastic time-history analysis of the structure, the seismic performance of the two staggered truss structures in the X direction is basically the same. The difference is mainly reflected in the seismic performance in the Y direction. The seismic performance of the hybrid staggered truss structure is obviously better than that of the vierendeel staggered truss structure.