The cable-stayed Shipshaw bridge, which crosses the Sagucnay river near Jonquiere, Quebec, suffered structural damage during the November 25, 1988 Saguenay earthquake (M{sub}L = 6,0). One of four anchorage plates connecting the steel box girders to one abutment failed due to the ground shaking. This paper compares the results of the modal analysis and testing conducted to determine the dynamic properties of the bridge. This comparison validated the dynamic model of the bridge used in a time-step analysis to explain the cause of failure. Measured natural frequencies and mode shapes are compared with the corresponding computed values. The paper also includes a description of the in-situ vibration measurements in which a 44 ton truck traveling on the bridge was used as dynamic excitation.
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机译：斜拉的Shipshaw Bridge，它在魁北克省Quebec附近的Sagucnay河附近越过魁北克省突破的结构损坏，1988年11月25日遭遇了结构损坏（M {Sub} L = 6,0）。由于地面摇动，将钢箱梁与一个基台连接到一个基台的四个锚固板中的一个。本文比较了所进行模态分析和测试的结果，以确定桥梁的动态特性。这种比较验证了在时间步骤分析中使用的桥梁的动态模型，以解释失败的原因。测量的自然频率和模式形状与相应的计算值进行比较。本文还包括对原位振动测量的描述，其中在桥上行驶的44吨卡车用作动态励磁。
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