建筑结构学报2025，Vol.46Issue(9)：13-23,11.DOI:10.14006/j.jzjgxb.2024.0207
低预应力需求自复位支撑-框架体系抗震性能研究
Investigation on seismic performance of low-prestressed self-centering braced frame system
摘要
Abstract
The development of the low-prestressed self-centering(LPSC)brace effectively addresses limitations of high prestress demand and limited axial deformation capacity of the self-centering brace.By utilizing stainless steel energy-dissipating rods and optimizing key structural components,the performance of the LPSC brace has been further enhanced.To comprehensively evaluate the seismic performance and advantages of the LPSC system,a nine-story braced steel frame was numerically modeled and analyzed in OpenSees.To ensure the accuracy of the results,two numerical models were developed in the analysis,one including the basement and the other excluding it.Comparative analyses were conducted between the original and optimized LPSC systems and other bracing systems,including buckling restrained brace(BRB),self-centering buckling restrained braces(SC-BRB),conventional self-centering energy-dissipation(C-SCED),and telescoping self-centering energy-dissipation(T-SCED)systems,focusing on both design requirements and seismic performance.The results indicate that the optimized LPSC system reduces the collapse probability under rarely occurring earthquakes from 2.5％to 0,and significantly improves control over story drift concentration and residual displacement.Notably,the prestress demand for the LPSC system is only 10％of that required by other self-centering brace systems,while post-earthquake structural damage remains minimal and residual drift is maintained below 0.2％,enabling rapid functional recovery after an earthquake.Although the LPSC system is slightly less effective than the BRB system in controlling floor accelerations,it demonstrates superior capacity in mitigating soft-story.Furthermore,the basement modeling approach influences the distribution of seismic responses and performance across all bracing systems.关键词
自复位支撑/支撑框架/抗震性能/残余位移/韧性结构Key words
self-centering brace/braced frame/seismic performance/residual deformation/resilient structure分类
建筑与水利引用本文复制引用
白鸿昊,周颖,肖意..低预应力需求自复位支撑-框架体系抗震性能研究[J].建筑结构学报,2025,46(9):13-23,11.基金项目
国家重点研发计划(2023YFC3805000),国家自然科学基金项目(52025083,52208501). （2023YFC3805000）
