基于BRB的铁路双柱式超高墩连续梁桥横向减震研究

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摘要为提升双柱式超高墩桥梁的横向抗震性能，可将屈曲约束支撑（BRB）用于双肢墩身。通过某铁路超高墩大跨连续钢桁梁桥非线性时程分析，研究了罕遇（PGA=0.227g）和极罕遇（PGA=0.640g）地震下BRB的参数影响规律、作用机理及减震效果，探讨了高阶振型对BRB墩身地震响应的影响。结果表明：BRB能够改变墩身传力路径，在一定参数范围内可将原有墩身部分弯矩转化为支撑点的轴力和剪力；罕遇地震下BRB未充分发挥耗能作用，地震响应随芯材面积Ae增加而不断接近X撑方案；极罕遇地震下设置BRB可明显减小墩顶位移和墩身轴力响应；BRB会适当增加墩身弯矩响应，但截面PM滞回并未超过等效屈服包络；由于高阶振型效应，BRB墩身中部的剪力、弯矩响应包络图凹凸交替变化；随着墩高的降低，高阶振型的影响减弱，墩身剪力、弯矩包络图近似双折线；采用BRB可有效抑制超高墩的高阶振型，同时提升极罕遇地震下桥墩的耗能能力、增强横桥向抗震性能。

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	漆启明1
	邵长江1
	黄辉1
	王应良2
	戴晓春3
	韦旺1

关键词 ：关键词：连续梁桥, 双柱式超高墩, 屈曲约束支撑（BRB）, 高阶振型, 减震性能

Abstract：To improve the transverse seismic performance of bridges with double-column ultra-high piers, the buckling -restrained braces (BRB) are used as the lateral connections of double columns. Taking a railway long-span continuous steel truss bridge as an example, nonlinear time history analysis was performed under rare (PGA=0.227g) and ultra-rare (PGA=0.640g) earthquakes. The law of design parameters, together with mechanism and seismic mitigation effects of BRB were investigated. The influence of higher order modes on seismic responses of piers with BRB was discussed. The results show that the force transmission path of pier is changed by BRB, and the former bending moment of the columns is partially transformed shear and axial forces within a certain extent at the support nodes. The energy dissipation role of BRB is not full activated under the rare earthquakes, and the seismic response tends to the X-brace model with the increase of core area Ae. When subjected to ultra-rare earthquake, the tip displacement and axial force are obviously reduced. Though the bending moment response would be increased in some degree, the PM interaction hysteresis does not exceeds the envelop curves of the equivalent yield state. Due to the higher order mode effects, the response of shear and moment in the middle of pier with BRB is alternately concave convex. The influence of higher order mode weakens with the decrease of height, and the shear and the moment envelopes approximate to be a bilinear. The higher order mode of ultra-high piers can be effectively suppressed by BRB. Meanwhile, the energy dissipation capacity of pier can be improved and the transverse seismic performance can be enhanced under ultra-rare earthquakes.

Key words： continuous bridge ultra-high double-column pier buckling restrained brace (BRB) higher order mode seismic mitigation performance

收稿日期: 2021-04-28 出版日期: 2022-04-15

引用本文:

漆启明1，邵长江1，黄辉1，王应良2，戴晓春3，韦旺1. 基于BRB的铁路双柱式超高墩连续梁桥横向减震研究[J]. 振动与冲击, 2022, 41(7): 182-192.
QI Qiming1, SHAO Changjiang1, HUANG Hui1, WANG Yingliang2, DAI Xiaochun3, WEI Wang1. Transverse seismic mitigation of railway continuous girder bridge with double-column ultra-high piers based on BRBs. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 182-192.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I7/182

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