自复位全钢型防屈曲支撑的工作原理与滞回特性研究  

THE HYSTERETIC BEHAVIOR AND WORKING MECHANISM OF SELF-CENTERING STEEL BUCKLING-RESTRAINED BRACES

作　　者：徐龙河[1] 陈鹏[1] XU Long-he;CHEN Peng(School of Civil Engineering,Beijing Jiaotong University,Beijing 10044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2020年第12期147-156,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51578058);北京市自然科学基金项目(8172038)。

摘　　要：该文提出一种新型自复位全钢型防屈曲支撑(SC-SBRB),主要由防屈曲耗能系统和预压组合碟簧自复位系统并联组成。对其基本构造和工作原理进行了介绍,建立了能够准确描述支撑滞回特性的恢复力模型。采用ABAQUS有限元软件建立了具有不同设计参数的4个SC-SBRB实体模型,研究了支撑在低周往复荷载作用下的滞回特性及复位性能,并与恢复力模型计算结果进行了对比分析。结果表明,低周往复荷载作用下,SCSBRB的滞回响应呈现稳定饱满的类“旗形”特征,建立的恢复力模型能够准确地预测支撑各阶段的力学性能。SC-SBRB的自复位性能随碟簧初始预压力的增大而逐渐得到发挥,残余变形同步减小。当复位率达到1.0时,支撑最大残余变形率为0.039%,复位性能和耗能能力匹配合理。A novel self-centering steel buckling-restrained brace(SC-SBRB)is proposed,which is mainly comprised of a buckling-restrained energy-dissipation system and a self-centering system of pre-pressed disc springs in parallel.The fundamental configuration and working mechanism of the SC-BRB are introduced.A restoring force model that accurately describes the unique hysteretic behavior of the SC-SBRB is established.Four solid numerical models of SC-SBRBs with different design parameters are built using ABAQUS finite element software.The hysteretic behavior and self-centering performance of the SC-SBRB under cyclic loading are studied and compared with the calculation results of the restoring force model.The results demonstrate that the SC-SBRB exhibits a stable and full flag-shaped hysteretic response under cyclic loadings,and that the proposed restoring force model is capable of accurately predicting the mechanical properties at different stages.The self-centering performance of the SC-SBRB is gradually exerted as the initial pre-pressed force of disc springs increases,while the residual deformation is reduced simultaneously.The maximum residual deformation ratio of the brace is decreased to 0.039%when the self-centering ratio is 1.0,indicating a good coordination of the self-centering and energy-dissipation performance.

关 键 词：防屈曲支撑 自复位性能 组合碟簧 恢复力模型 残余变形 

分 类 号：TU352.1[建筑科学—结构工程]