自复位全钢型防屈曲支撑的工作原理与滞回特性研究 |
| |
引用本文: | 徐龙河,陈鹏. 自复位全钢型防屈曲支撑的工作原理与滞回特性研究[J]. 工程力学, 2020, 37(12): 147-156. DOI: 10.6052/j.issn.1000-4750.2020.01.0034 |
| |
作者姓名: | 徐龙河 陈鹏 |
| |
作者单位: | 北京交通大学土木建筑工程学院,北京 100044 |
| |
基金项目: | 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。
|
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 |
收稿时间: | 2020-01-15 |
THE HYSTERETIC BEHAVIOR AND WORKING MECHANISM OF SELF-CENTERING STEEL BUCKLING-RESTRAINED BRACES |
| |
Affiliation: | School of Civil Engineering, Beijing Jiaotong University, Beijing 10044, China |
| |
Abstract: | 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. |
| |
Keywords: | |
|
| 点击此处可从《工程力学》浏览原始摘要信息 |
|
点击此处可从《工程力学》下载免费的PDF全文 |
|