新型TDAB力学性能及其在双柱式桥墩减震中的应用  

MECHANICAL PERFORMANCE OF NOVEL TDAB AND ITS SEISMIC REDUCTION APPLICATION IN DOUBLE-COLUMN PIERS

作　　者：王德斌 王英豪 付兴 孙治国[3] 张昕岳 WANG De-bin;WANG Ying-hao;FU Xing;SUN Zhi-guo;ZHANG Xin-yue(School of Civil Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Key Laboratory of Building Collapse Mechanism and Disaster Prevention,China Earthquake Administration,Institute of Disaster Prevention,Beijing 101601,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]防灾科技学院中国地震局建筑物破坏机理与防御重点实验室,北京101601

出　　处：《工程力学》2025年第3期128-142,共15页Engineering Mechanics

基　　金：辽宁省教育厅科研项目(LJKMZ20220860);国家自然科学基金项目(52027811,51978167)。

摘　　要：为解决传统位移相关型支撑在低强度地震作用下变形较小难以充分发挥其工作性能的问题,基于桥式放大工作机理提出了一种扭转位移放大型支撑(TDAB)。介绍了其基本构造、工作机理,基于弹性、弹塑性及完全塑性3个变形阶段推导给出了支撑理论恢复力模型,通过数值模拟研究了不同初始放大角度下支撑的滞回性能、等效阻尼比和塑性变形,并对附加新型TDAB的双柱式桥墩进行抗震性能分析。结果表明:理论恢复力模型能够有效描述TDAB的滞回性能,与数值模拟结果吻合较好;随着初始放大角度α0的减小,TDAB屈服承载力、最大承载力、初始刚度和耗能能力均显著提高;合理设计传力转动板尺寸,支撑最大拉压荷载比能够满足规定限值1.3,但仍建议采用倒V形或人字形支撑布置形式,以满足结构在正、负两加载方向的均衡性抗震性能需求;将设有不同初始放大角度的TDAB应用于双柱式桥墩结构,TDAB展现出了良好的减震控制效果,附加新型TDAB的双柱式桥墩最大墩顶位移、墩底塑性转角和桥墩墩底剪力均明显减小,通过减小TDAB初始放大角度能够进一步提高双柱式桥墩的抗震性能。In order to solve the problem that traditional displacement-related braces have small deformation and are difficult to fully exert their working performance under low-intensity earthquakes,a torsional displacement-amplified brace(TDAB)is proposed upon the bridge amplification working mechanism.Its basic structure and working mechanism are introduced first,and then a theoretical restoring force model for TDAB is deduced upon the elastic,elastoplastic and complete plastic deformation stages.Through numerical simulation,the hysteretic properties,equivalent damping ratio and plastic deformation of the TDAB at different initial magnification angles are investigated,and the seismic performance of a double-column pier structure with the TDAB proposed is analyzed.The results show that the theoretical restoring force model can effectively describe the hysteretic performance of the TDAB,which is in a good agreement with the numerical simulation results.With the decrease of the initial magnification angleα0,the yield bearing capacity,maximum bearing capacity,initial stiffness and energy dissipation capacity of the TDAB increase significantly.When designing the size of the force transfer rotating plate reasonably,the maximum tension-compression load ratio of the brace can meet the specified limit of 1.3,but it is still recommended to adopt the inverted V or herringbone support layout to meet the balanced seismic performance requirements of the structure in the positive and negative loading directions.The TDAB shows an excellent seismic control performance when being applied to a double-column pier structure with different initial amplification angles.The maximum pier top displacement,maximum plastic rotation and shear force of the double-column pier structure equipped with the TDABs all decrease obviously,and the seismic performance can be further improved by reducing the initial amplification angle of the TDAB.

关 键 词：位移放大 扭转耗能 恢复力模型 数值模拟 减震率 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]