基于易损性的高墩多塔斜拉桥纵向减震控制研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (22) : 149-157.

论文

胡思聪 1 ，李立峰 1,2，王连华 1,2

作者信息 +

Seismic control for multi-span cable-stayed bridge with high-piers using probability fragility method

HU Si-cong 1 LI Li-feng 1,2 WANG Lian-hua 1,2

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文章历史 +

摘要

为研究常用的减震控制方式在高墩多塔斜拉桥这种新型结构中的减震效果，以一座墩高178m的斜拉桥为例，建立了非线性有限元动力分析模型。从PEER强震数据库中选取80条实测地震波进行非线性时程分析；结合结构的特点，定义各关键构件的损伤指标；基于易损性分析理论，建立了关键构件及桥梁系统的易损性曲线。以铅芯橡胶支座和粘滞阻尼器为代表，通过易损性曲线对比研究了不同控制参数和布置形式下，位移型及速度型两类减震控制方式的减震效果。最后，结合桥梁实际情况确定最优的减震方案。分析结果表明：由于高墩的影响，斜拉桥的支座系统、主梁和拉索的损伤概率显著增加，而索塔损伤相对轻微；由于传力机理的差异，不同布置形式下控制参数对减震效果的影响规律不同；无论是位移型还是速度型控制方式，梁端布置形式的减震效果均优于塔梁布置形式；对于相同的布置形式，速度型控制方式较位移型控制方式效果更加显著。

Abstract

In order to investigate the effect of seismic control devices on multi-span cable-stayed bridges with high piers, a cable-stayed bridge with 178 meters piers was taken as a case-study and the nonlinear finite element model was built in this paper. A series of 80 ground motions were selected from the Pacific Earthquake Engineering Research Center database and the nonlinear history analysis have been conducted. The damage indexes of various components were defined according to the structure characteristic. Based on the fragility method, components and bridge system fragility curves were established respectively. The seismic control effect of Displacement-type and Velocity-type control devices, represented by the Lead Rubber Bearing (LRB) and the Viscous Fluid Damper (VFD), with different parameter and arrangement form was contrasted and investigated though fragility curves. At last, the optimal seismic control of the bridge was determined. The results show that the damage probability of bearing, deck and cables increased significantly, and ones of towers become slighter with the increase of the height of piers; Due to the different transmission mechanism of inertial force, the influence of seismic control parameter present discrepancy for different arrangement forms. The device install at the end of deck is superior to install between deck and towers. For the same arrangement form, Velocity-type control device is more effective than the Displacement-type control device.

导出引用

胡思聪 1,李立峰 1,2，王连华 1,2. 基于易损性的高墩多塔斜拉桥纵向减震控制研究[J]. 振动与冲击, 2017, 36(22): 149-157

HU Si-cong 1 LI Li-feng 1,2 WANG Lian-hua 1,2. Seismic control for multi-span cable-stayed bridge with high-piers using probability fragility method[J]. Journal of Vibration and Shock, 2017, 36(22): 149-157

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