钢铅组合防屈曲支撑的滞回性能与参数研究  

Research on Hysteretic Characteristics and Parameters of Steel-lead Mixed Buckling-restrained Brace

作　　者：闫维明[1] 何伟[1] 陈适才[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《防灾减灾工程学报》2011年第6期609-615,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家科技支撑计划课题(2006BAJ03B06)资助

摘　　要：为简化防屈曲支撑的加工工艺,提高防屈曲支撑的初始刚度和在小变形下的耗能能力,基于现有防屈曲支撑在截面形式与构造方式上的特点,提出了一种新型钢铅组合防屈曲支撑并进行了构造设计。通过有限元数值模拟,分析了钢铅组合防屈曲支撑的耗能特性与效果,建立了恢复力简化模型,并根据理想弹塑性材料本构关系推导出滞回规则。通过对不同设计参数的理论分析和数值模拟,分析了钢铅屈服力比、铅剪切面长宽比、核心段宽厚比和耗能段长度等参数对防屈曲支撑滞回性能的影响。研究结果表明,钢铅组合防屈曲支撑能够提供较大的抗侧刚度,耗能效果良好,加工工艺简单,适合工程应用。Based on the cross-section and construction characteristics of existing BRBs,the concept of steel-lead mixed BRB is proposed in order to simplify the manufacture process,improve the capacity of dissipating energy and increase the stiffness in small deformation,and the construction is designed.According to the results of finite element analysis,the features and effect of dissipating energy of steel-lead mixed BRB is analyzed,a simple resilience model is obtained,and the hysteretic rules are summed up according to the ideal elasto-plastic material constitutive relation.By the theoretical analysis and FEA of different design parameters,the influence of steel-lead yield load ratio,lead shear plane length-width ratio,core segment width-thickness ratio and length of core segment on hysteretic characteristics of BRB is analyzed. The result of analysis shows that steel-lead mixed BRB provides larger stiffness to resist lateral deformation, has good effect in energy dissipation,and it is easy to manufacture and useful in engineering application.

关 键 词：防屈曲支撑(BRB) 钢铅组合 滞回曲线 恢复力模型 

分 类 号：TU352.1[建筑科学—结构工程]