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典型高墩大跨混凝土刚构桥模态参数测试

, PP. 33-39

Keywords: 高墩大跨,刚构桥,模态参数,抗震薄弱方向,阻尼比

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Abstract:

位于云南省鲁甸县的牛栏江大桥是三跨一联(90m+170m+90m)的预应力混凝土刚构桥,混凝土薄壁空心墩高度为128m,是典型的高墩大跨混凝土刚构桥。为了系统研究该类桥梁的抗震性能,对牛栏江大桥实施了模态测试。通过合理选择传感器和记录器,恰当地布置测点,克服了信号弱、频率低、测点间距大等困难,得到了高质量的反映该桥模态的数据。结合数值分析给出的振型形状,依据实测数据得出该桥的竖向、纵向和横向多阶模态。该桥构造上具有横向类似悬臂梁的特点,约束最少,相对薄弱,模态结果证实了这一认识。

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