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榕江大桥主桥振动台试验研究

, PP. 39-44

Keywords: 矮塔斜拉桥,振动台试验,抗震结构体系,粘滞阻尼器,无约束体系

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Abstract:

榕江大桥是一座柔梁矮塔斜拉桥,为研究其纵向合理抗震体系和减震措施,设计了120缩尺试验模型,并开展了四台阵振动台试验。通过改变塔-梁的连接方式,建立了无约束体系和粘滞阻尼器体系的试验模型,并分别测试不同地震激励下的地震反应。试验结果表明与无约束体系相比,粘滞阻尼器体系不能减小结构的纵向加速度反应,但能够有效减小纵向位移反应,且随着动峰值加速度的增加,位移控制的效果更明显;在具有相同动峰值加速度的不同地震波激励下,结构的地震响应存在差异,甚至相差较大,应选取与工程场地频谱特征值相符的地震波进行桥梁抗震设计。

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