支撑与基础刚接的摇摆钢支撑框架结构抗震性能研究  

Study on seismic performance of rocking steel braced framestructure with rigid connection between brace and foundation

作　　者：钱佳怡 赵宝成[1] QIAN Jiayi;ZHAO Baocheng(Jiangsu Key Laboratory of Structure Engineering,SUST,Suzhou 215011,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2024年第4期17-24,共8页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金项目(51878432)。

摘　　要：为了使摇摆钢支撑框架结构具备耗能能力,更好地控制结构在地震作用下的摇摆幅值,提出在摇摆钢支撑两侧框架柱的柱脚位置设置耗能装置,同时简化摇摆钢支撑与基础之间的构造,支撑与基础采用刚性连接。应用有限元软件ABAQUS建立支撑与基础刚接的摇摆钢支撑框架结构模型,对模型进行低周往复加载,得到了其破坏模式,分析了耗能柱脚剪切板开孔间距、剪切板厚度和中心钢支撑跨度等设计参数对其滞回性能的影响,给出了结构设计参数的建议取值和极限承载力计算公式。分析结果表明:支撑与基础刚接的摇摆钢支撑框架结构滞回性能良好,破坏模式合理;在水平荷载作用下,耗能柱脚率先进入塑性耗能,塑性变形充分,耗能能力强;加载过程中,高强度螺栓未达到极限强度,连接方式可靠;随着开孔间距、剪切板厚度和支撑跨度的增加,结构在相同侧移比下的抗侧承载力和刚度提高,但是耗能能力有所下降;公式计算结果与有限元结果吻合较好,可供实际工程参考。In order to make the rocking steel braced frame structure equipped with energy dissipation capacity and better control the rocking amplitude of the structure under earthquake action,the paper proposes that energy dissipation devices be set at the column base on both sides of the rocking steel braced frame column,and that the structure between the rocking steel brace and the foundation be simplified,and the brace and the foundation are rigidly connected.The finite element software ABAQUS was used to establish the structural model of the rocking steel braced frame with rigid connection between the brace and the foundation;the model was subjected to low circumferential reciprocating loading,then its damage mode was obtained;the effects of design parameters such as the opening spacing of the shear plate at the base of the energy-consuming columns,the thickness of the shear plate and the span of the central steel brace on its hysteresis performance were analyzed,then the suggested values of the structural design parameters and the formula for calculating the ultimate load carrying capacity were given.The analysis results show that the hysteresis performance of the rocking steel braced frame structure with rigid connection between the brace and foundation is excellent,and the damage mode is reasonable.Under the action of horizontal load,the energy-consuming column base takes the lead to enter the plastic energy dissipation,and the plastic deformation is sufficient,and the energy-consuming capacity is strong.During the loading process,the high-strength bolts do not reach the ultimate strength,and the connection method is reliable.With the increase of the opening space,the thickness of the shear plate and the braced span,the lateral bearing capacity and stiffness of the structure in the same lateral displacement ratio increase,but the energy-consuming capacity decreases.The calculation results by the formula are in good agreement with the finite element results,which can be used as a reference for practical engineering.

关 键 词：摇摆钢支撑 耗能柱脚 抗震性能 有限元分析 

分 类 号：TU391[建筑科学—结构工程]