强化准则对含屈曲约束支撑结构附加阻尼比影响分析  

Analysis of the influence of hardening rule on additional damping ratio of buckling-restrained brace structure

作　　者：陈橙 赵娟 胡大柱 Chen Cheng;Zhao Juan;Hu Da-zhu(Shanghai Institute of Technology,Shanghai 201418,China)

机构地区：[1]上海应用技术大学,上海201418

出　　处：《工程抗震与加固改造》2025年第2期47-56,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金青年基金项目(51408361)。

摘　　要：在地震作用下,屈曲约束支撑会经历塑性变形的过程,产生循环硬化。然而,在工程设计中,模拟屈曲约束支撑滞回性能时,其强化准则的选取尚未得到充分重视。为探究使用不同强化准则对含屈曲约束支撑结构的附加阻尼比的影响,本文推导了随动强化、混合强化和等向强化3种强化准则对附加阻尼比及有效刚度的影响。通过Q235钢材为芯板的屈曲约束支撑低周往复加载试验,得到实测滞回曲线及骨架曲线。以试验骨架曲线为基础,结合ETABS软件中的强化模型,以非线性弹簧单元模拟屈曲约束支撑,采用与试验相同的加载规则,对比双线性和多线性骨架曲线在不同强化准则下的滞回特征。构建多层和高层框架结构,分析含屈曲约束支撑结构在不同强化准则下附加阻尼比的基本规律。结果表明:多线性骨架混合强化模型能够较为准确模拟屈曲约束支撑的力学行为。对于缺少混合强化准则的模型,也可以选择随动强化准则,但需要对随动强化大震下计算的附加阻尼比进行调整。Under the action of earthquake,a buckling-restrained brace will undergo the process of plastic deformation,resulting in cyclic hardening.However,in engineering design,the selection of hardening rule has not been paid enough attention when simulating the hysteretic behavior of buckling-restrained braces.In order to explore the influence of different hardening rules on the additional damping ratio of the structure with buckling-restrained braces,the influence of three hardening rules of kinematic hardening,mixed hardening and isotropic hardening on the additional damping ratio and effective stiffness were deduced.Through the low-cycle loading test of buckling-restrained brace with Q235 steel as the core plate,the measured hysteresis curve and skeleton curve are obtained.Based on the test skeleton curve,combined with the hardening rule in software ETABS,the nonlinear spring element was used to simulate the buckling-restrained brace.The same loading rules as the test were used to compare the hysteretic characteristics of bi-linear and multi-linear skeleton curves under different hardening rules.The basic law of additional damping ratio of buckling-restrained brace structure under different hardening rules was analyzed by constructing multi-story and high-rise frames.The results show that the multi-linear skeleton hybrid hardening model can accurately simulate the mechanical behavior of buckling-restrained braces.For the model without mixed hardening rule,the hardening rule of kinematic hardening can also be selected,but the additional damping ratio calculated needs to be adjusted.

关 键 词：屈曲约束支撑 强化准则 附加阻尼比 骨架曲线 混合强化 

分 类 号：TU352[建筑科学—结构工程]