Seismic performance analysis of centrally braced steel frame with one-side bolt connection
LIN Xinyan
YANG Xinyu
WANG Xinwu
XUN Haisu
LIU Huanhuan
JANG Il Young
Abstract：Objectives In order to study the seismic performance of braced and semi-rigid steel frame struc-ture system,Methods a center-braced steel frame with semi-rigid beam-column joints composed of nested one-side bolts and T-stub was designed,and the quasi-static test and finite element numerical simulation were carried out.By observing the entire experimental phenomenon,the seismic indicators such as hyster-esis,bearing capacity,stiffness degradation,and energy dissipation were analyzed.Results The results show that the failure process of the specimen has gone through three stages:elastic section,plastic sec-tion,and failure section,the failure mode of the specimen is mainly the buckling failure of the brace un-der compression,and the plastic deformation mainly accumulates on the brace system,presenting the char-acteristics of ductile failure as a whole.After the brace breaks,there is no obvious plastic deformation in beam-column and T-shaped steel joints,and the steel frame still has a high safety reserve,which conforms to the design principle of"strong joints and weak members."It indicates that the structure has two lines of seismic resistance.Conclusions The cooperative work of brace and semi-rigid steel frame makes the speci-men have high lateral stiffness,horizontal deformation resistance,high bearing capacity,stable hysteretic performance and excellent energy dissipation capacity;During the test,the mechanical performance of the one-side bolts are not significantly different from that of the ordinary high-strength bolt,and there is no se-rious relaxation of the preload,and it can effectively maintain the bolt preload.Through finite element nu-merical analysis,it is known that reducing the slenderness ratio of the brace can effectively improve the seismic performance of the structure,but a small slenderness ratio can lead to an increase in the stiffness of the brace and accelerate the damage of other components.Therefore,in order to effectively improve the seismic performance of the structure,it is necessary to consider the ductility of the structure and reduce the slenderness ratio of the brace.
Keywords：center braceone-side boltsT-stubsemi-rigid connectionseismic performance
Publication Date：2024-04-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 166-176 )