斜拉桥横向减震振动台试验

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (3) : 47-53.

论文

斜拉桥横向减震振动台试验

易江1，孙平宽2，李建中1

作者信息 +

Shaking table tests for transverse aseismic control of cable-stayed bridges

YI Jiang1, SUN Ping-kuan2, LI Jian-zhong1

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摘要

为了研究弹塑性阻尼器对斜拉桥横向地震反应的减震效果，以一座独塔斜拉桥为研究对象，设计了1:20大比例缩尺的全桥振动台模型，采用一条远场波和一条近场波作为地震输入，对该模型进行了全桥横向振动台试验。试验结果表明，与塔梁、墩梁横向固定连接相比，塔梁、墩梁横向采用弹塑性阻尼器连接能有效减小桥塔横向地震响应，如在远场和近场地震输入下，塔底截面钢筋应变分别最大减小了40%和10%；但在近场地震输入下，弹塑性阻尼器变形约为远场地震输入时的3.6~4.6倍，加载完成后产生明显的残余变形。通过对比数值和试验结果可知，数值结果与试验结果较接近、吻合较好。

Abstract

based on a single-tower cable-stayed bridge, a 1:20 large scale full bridge model for shaking table tests was designed to study the effectiveness of elastic-plastic damper to reduce transverse seismic responses of the cable-stayed bridge. Both a far-field ground motion wave and a near-field one were taken as seismic inputs for the bridge model’s shaking table tests. Test results showed that comparing to a rigid connection of tower-deck and pier-deck, tower-deck connected to pier-deck with elastic-plastic dampers effectively reduces transverse seismic responses of the tower; under the action of a far-field ground motion wave and a near field one, the reinforcing bar strain of the tower bottom section can be reduced by 40% and 10%, respectively; however, under the action of a near-field ground motion wave, the elastic-plastic damper’s deformation is 3.6~4.6 times of that under the action of a far-field one, it produces obvious residual deformation after loading is completed. Comparing the test results with those of numerical analysis, both of them agreed well.

关键词

斜拉桥

/ 横向减震 / 振动台试验 / 弹塑性阻尼器

Key words

cable-stayed bridge / transverse aseismic control / shaking table test / elastic-plastic damper

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易江1，孙平宽2，李建中1. 斜拉桥横向减震振动台试验[J]. 振动与冲击, 2018, 37(3): 47-53

YI Jiang1, SUN Ping-kuan2, LI Jian-zhong1. Shaking table tests for transverse aseismic control of cable-stayed bridges[J]. Journal of Vibration and Shock, 2018, 37(3): 47-53

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