山区桥梁双柱式桥墩设置BRB的减震效果研究

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摘要为增强山区桥梁双柱式桥墩的横向抗震能力，本文尝试采用一种新型的耗能减震构件，即在双柱式桥墩之间设置防屈曲支撑(Buckling-Restrained Braces, BRB)，并通过数值分析手段研究其减震效果。考虑双柱式桥墩的规则性和BRB布置形式，利用SAP2000软件建立含BRB的双柱式桥墩横向分析模型。采用谱分析和非线性时程分析，得到双柱墩小震（线弹性）和大震（弹塑性）作用下的内力和变形。引入减震率和残余位移角两个参数，通过增量动力分析方法，进一步验证BRB对双柱式桥墩抗震能力的提升作用。结果表明，小震下BRB可减轻规则与非规则双柱式桥墩承受的地震力，但会一定程度增加基础剪力，大震下BRB能够有效减小桥梁墩柱最大塑性变形并控制其残余位移角。

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	李晓莉1
	孙治国2
	刘昕1
	王东升1
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关键词 ：双柱式桥墩, 减震设计, 防屈曲支撑, 非线性时程分析, 减震率, 残余位移角

Abstract：In order to improve the lateral seismic performance of bridges with double column bents in mountain areas, a new seismic retrofitting method for the bents was proposed by using buckling-restrained braces (BRB) as a seismic dissipation damper and the seismic behaviors of the bents were analyzed.Considering the regularity of the bents and layout of the BRB, a seismic analysis model for the bents in lateral direction retrofitted with BRB was built by using the software SAP2000.The internal forces and deformations of the bents were obtained by the linear response spectrum analysis under small earthquakes and the nonlinear time history analysis under strong earthquakes.The incremental dynamic analysis on the double column bridge bents retrofitted with BRB was conducted, and the responses of the bents were further verified by introducing two comparable parameters, the seismic response reduction ratio and residual drift ratio.The results show that the BRB can reduce internal forces of the bents effectively, while the shear strength demand of the bent base would be increased.The BRB could also reduce the maximum plastic deformation and residual drift ratio of the bents effectively.

Key words： double column bridge bents seismic reduction design bucking-restrained braces nonlinear time history analysis seismic response reduction ratio residual drift ratio

收稿日期: 2017-07-13 出版日期: 2018-11-15

引用本文:

李晓莉1，孙治国2，刘昕1，王东升1,3. 山区桥梁双柱式桥墩设置BRB的减震效果研究[J]. 振动与冲击, 2018, 37(22): 173-180.
LI Xiaoli1,SUN Zhiguo2,LIU Xin1,WANG Dongsheng1,3. Seismic responses of double column bridge bents with buckling-restrained braces in mountain areas. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(22): 173-180.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I22/173

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