| BRB在双柱式桥墩抗震体系中的工作机理分析 |
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| 引用本文： | 张永亮,董阳,张磊,陈兴冲.BRB在双柱式桥墩抗震体系中的工作机理分析[J].西北地震学报,2018,40(5):957-962. |
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| 作者姓名： | 张永亮 董阳 张磊 陈兴冲 |
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| 作者单位： | 兰州交通大学甘肃省道路桥梁与地下工程重点实验室, 甘肃 兰州 730070;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室, 甘肃 兰州 730070,兰州交通大学甘肃省道路桥梁与地下工程重点实验室, 甘肃 兰州 730070;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室, 甘肃 兰州 730070,北京堡瑞思减震科技有限公司, 北京 100043,兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室, 甘肃 兰州 730070 |
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| 基金项目： | 国家自然科学基金项目（51768037，51768036）；甘肃省科技计划资助（17JR5RA103） |
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| 摘 要： | 以设置防屈曲支撑(Buckling-Restrained Braces,BRB)的双柱式桥墩体系为研究对象,系统分析上部结构惯性力在该体系中的传递机理;以某3×30m公路高架桥为工程背景,采用非线性时程反应分析法研究BRB的设置方式及参数取值对桥梁地震反应的影响规律,揭示BRB在双柱式桥墩中的工作机理。其研究结论为:(1)对于设置BRB的双柱式桥墩,当BRB未屈服时,通过其轴向刚度改变结构体系的传力路径,墩底弯矩、剪力降低,但墩底轴力改变量将增大,即以较大的墩身轴力改变量换取较小的墩底弯矩及剪力。(2)在BRB屈服的情况下,BRB通过改变下部结构的传力路径及滞回耗能双重机制影响结构的地震反应,BRB耗能作用将降低墩身的轴力改变量,使减震效果更优。(3)双柱式桥墩横桥向设置BRB是一种较为有效的减震体系,但其减震效果与BRB具体布置方式及力学参数取值有关。
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| 关 键 词： | 公路桥梁 双柱式墩 地震反应 BRB 减震机理 |
| 收稿时间： | 2017/6/7 0:00:00 |
Working Mechanism of Buckling-restrained Braces in theSeismic System of Double-column Bridge Piers |
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| ZHANG Yongliang,DONG Yang,ZHANG Lei and CHEN Xingchong.Working Mechanism of Buckling-restrained Braces in theSeismic System of Double-column Bridge Piers[J].Northwestern Seismological Journal,2018,40(5):957-962. |
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| Authors: | ZHANG Yongliang DONG Yang ZHANG Lei and CHEN Xingchong |
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| Institution: | Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, Gandu, China;National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China,Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, Gandu, China;National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China,Beijing Baoruisi Shock Absorption Technology Co., Ltd., Beijing 100043, China and National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China |
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| Abstract: | This study investigates a double-column pier system with buckling-restrained braces (BRB), while focusing on the transmission mechanism of the superstructure inertial force in the system. Taking a 3×30 m highway viaduct as the engineering background, the positioning of BRB and the influence of different parameters on the seismic response of the bridge were studied by a nonlinear time-history response analysis to understand the working mechanism of BRB in double-column piers. The following can be concluded from the study:(1) For double-column piers with BRB, when BRB do not yield, it changes the force transfer path of a structure through its axial stiffness, thereby decreasing the bending moment and sheer force of the pier bottom; however, the change of axial force at the pier bottom would be enlarged. (2) When the BRB yields, it influences the seismic response of the structure by changing the force transfer path of the substructure and its hysteretic energy dissipation mechanism. The energy consumption of BRB would reduce the change of axial force of the pier and optimize the damping effect. (3) Double-column pier with BRB in transverse bridge direction is an effective damping system, and the damping effect is relevant to the specific arrangement and mechanical parameters of BRB. |
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| Keywords: | highway bridges double-column pier seismic response buckling-restrained brace (BRB) seismic-reduction mechanism |
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