结构质量分布及损伤与动力响应关系研究

结构动力系统中质量、阻尼、刚度等物理参数及其分布决定着结构的动力特性．当这些物理参数及其分布发生改变时，结构的动力特性会随着改变，从而即使在相同荷载作用下，结构的动力响应也会发生改变．为保障结构的安全运营需深入了解结构在不同质量分布及损伤情况下的动力响应．用试验的方法研究了结构的不同质量分布及损伤与结构动力响应的关系．不同质量分布用立柱上方不同的质量块模拟，结构损伤用立柱中部的裂缝模拟．测试了正弦扫频激励结构发生一阶共振时动力应变的最大值．试验结果表明结构动力应变响应最大值随着结构质量分布的不均匀程度的增大而增大．在不同的质量分布状况下，当结构无损伤时，结构下部应变响应最大值总大于结构中部应变响应最大值．当结构有损伤时，结构下部应变响应最大值总小于结构中部应变响应最大值．

Study on relationship between structural mass distribution, damage and dynamic response

The structural dynamic property is determined by physical parameters such as mass,damping,stiffness and their distribution.The structural dynamic property alters when these parameters and their distribution change.So the structural dynamic response varies even if the exciting force is same.Maintaining safety and integrity of the structures requires a better understanding of relationship between structural mass distribution,damage and dynamic response.In this study,relationship between structural mass distri...