消能限位型钢支撑抗震性能试验研究及结构地震易损性分析  

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF ENERGY DISSIPATION AND POSITION LIMITATION STEEL BRACE AND STRUCTURE SEISMIC VULNERABILITY ANALYSIS

作　　者：刘春阳[1,2] 孙鹏 赵兴权 LIU Chun-yang;SUN Peng;ZHAO Xing-quan(Department of Civil Engineering,Shandong Jianzhu University,Jinan,Shandong 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan,Shandong 250101,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101

出　　处：《工程力学》2022年第5期210-223,共14页Engineering Mechanics

基　　金：山东省自然科学基金项目(ZR2018MEE044)。

摘　　要：该文提出一种消能限位型钢支撑以期改善建筑结构抗震性能,设计了5个钢支撑,设计参数为限位位移、限位块数量、钢芯截面尺寸及长度。通过低周往复加载试验对5个钢支撑的破坏特征、滞回特性、骨架曲线和刚度等抗震性能进行了研究。基于IDA分析评估了含钢支撑框架结构模型的抗地震倒塌性能。结果表明:该钢支撑构造合理,滞回性能稳定;增设限位块后可发挥限位作用,并可提供较大的附加刚度;限位块数量和截面尺寸以及其与支撑工作段连接面焊缝的刚度影响附加刚度的提升程度;该文提出的钢支撑各阶段刚度计算公式所得结果与试验值符合较好,可为钢支撑设计提供参考;设置含有限位块的消能限位型钢支撑结构的倒塌储备系数提高,有利于改善底层柔性结构的抗倒塌能力。A kind of energy dissipation and position limitation type steel brace is proposed to improve the seismic performance of a building structure. Five steel braces are designed, and the limitation displacement,limitation block number, steel core section size and length are chosen as the design parameters. Based on the test study, the characteristics including the failure mode, hysteresis loops behavior, skeleton curves, and stiffness are demonstrated. The seismic collapse resistance of steel braced frame structures is evaluated through IDA analysis.The results show that: the steel brace structure is reasonable with stable hysteretic performance, and the position limitation block could play a limiting role and provide greater additional stiffness. The number and section size of the position limitation block and the weld stiffness of the joint surface with the steel core affect the lifting degree of the additional stiffness. The calculation results of the stiffness formulas presented are in a good agreement with the experimental values, which can provide a reference for the practical design of steel braces. The collapse reserve coefficient of this type of steel braces with position limitation blocks is increased, beneficial to improve the collapse resistance of soft first storey building.

关 键 词：底层柔性建筑 钢支撑 消能限位 支撑附加刚度 地震易损性分析 抗倒塌性能 

分 类 号：TU392[建筑科学—结构工程]