【摘 要】
：
测试和分析了两座混凝土桥梁的动力响应,使用冲击荷载激振。第一座桥梁系在跨中加载,荷载分四级,直到桥梁因超载而破坏。每级荷载在施加后均作全套模态分析。第二座桥梁在梁
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测试和分析了两座混凝土桥梁的动力响应,使用冲击荷载激振。第一座桥梁系在跨中加载,荷载分四级,直到桥梁因超载而破坏。每级荷载在施加后均作全套模态分析。第二座桥梁在梁板的下表面粘贴了附加钢筋(钢筋置于钢模板中)。分别测量了附加钢筋粘贴前后模态参数。桥梁加载至剪切破坏为止,然后再测量其模态参数。两座桥均观测到了共振频率和相对阻尼比中的较小差异,也观测到了振型图间的差异。
The dynamic response of two concrete bridges was tested and analyzed using shock load excitation. The first bridge is loaded in midspan and the load is divided into four levels until the bridge is destroyed by overloading. After each load is applied to make a full set of modal analysis. The second bridge has additional bars attached to the underside of the slab (the bars are placed in the steel formwork). The modal parameters before and after attaching the rebars were measured respectively. The bridge is loaded until the shear failure, and then its modal parameters are measured. Both bridges observed smaller differences in resonance frequency and relative damping ratio and also observed differences in mode shapes.
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