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工程力学  2014 

钢管混凝土单圆管拱结构振动台阵试验研究

DOI: 10.6052/j.issn.1000-4750.2012.11.0857, PP. 82-92

Keywords: 钢管混凝土拱桥,地震响应,振动台阵试验,单圆管,多点激励,抗震分析

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Abstract:

为了研究钢管混凝土拱桥地震响应特性,以某钢管混凝土拱桥为原型,通过采用人工质量一致相似律设计制作1∶10缩尺比例的钢管混凝土拱结构模型,利用福州大学地震模拟振动台台阵系统,采用正弦波激励、Taft波以及当地场址生成的人工波等,进行了纵向、横向、横向+纵向地震动试验。试验结果表明,不同的地震波激励使结构产生不同的地震响应。Taft波横向激励产生的响应小于纵向激励的,人工波正好相反。拱顶的加速度相对于拱脚的有放大作用,放大倍数与输入波形的卓越周期相关；多维激励和行波激励使结构的加速度、位移和应变响应显著增大,其对结构的影响比一致激励时更为不利。不过,试验过程中模型均未出现开裂和破坏现象,表明钢管混凝土拱结构具有良好的抗震性能。

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