Abstract

Info

Title:: Seismic Performance of Reduced Beam Section Connection Steel Frames Under Low-cyclic Loading

Author(s):: ZHENG Hong; MENG Chun-hui; SHI Dan; School of Civil Engineering, Chang’an University

Keywords:: reduced beam section connection; space steel frame; finite element analysis; plastic hinge; hysteretic behavior; seismic performance

Abstract:: In order to study seismic performance of reduced beam section connection steel frames under lowcyclic loading, finite element simulation analysis of space steel frames with common connections or reduced beam section connections were carried out using ABAQUS software. Based on the finite element simulation analysis results, the failure mode, bearing capacity, hysteretic behavior, energy dissipation capacity, strength and stiffness degradation of the two types of steel frames were compared. The results show that the reduced beam section connection can let the plastic hinge of beam end move outward to beam end flange weakened, and avoid welded connection brittle fracture induced by stress concentration. The equivalent viscous damping ratio of reduced beam section connection steel frame is obviously greater than common connection steel frame. When the steel frames enter the yield stage, the stiffness and bearing capacity degradation of reduced beam section connection steel frame is slower than common connection steel frame. The reduced beam section connection steel frame has beam hinge ductility failure mechanism, and the seismic performance is better.