反分析理论在测试结构动应力中的应用
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摘要
水流、风、地震等脉动荷载作用在大型结构或建筑物时,经常会诱发结构振动。这些振动有时会危及结构的安全,甚至引起结构的破坏。当结构振动时,会引发的结构动应力,就目前研究水平来说对结构动应力直接进行测量还是一个难点,而对结构动位移的测量已经相当成熟。变换思路,通过对结构动位移的测量,结合模态叠加法,反分析结构的动应力,从而为结构的安全进行评价。以模态叠加法原理为基础,结合结构动位移的测试结果来反分析结构的动应力的思路无论从理论上还是实践上都是可行的,为大型结构动应力的测试提供了一种新的思路和方法。
When the pulsating load,such as water wind and earthquake,acts on a large-scale structure or building,vibration will be induced.Sometimes vibration will endanger the safety of a structure and even destroy it.When the structure vibrates,its dynamic stress will be induced.As far as the present research is concerned,it is still difficult to test the dynamic stress directly.However,it is easy to test the dynamic displacement of a structure.In this paper,a new way will be introduced,that is,the dynamic stress can be calculated by testing the dynamic displacement of a structure combining the method of mode superposition.Then the result can be used to evaluate the safety of the structure.The measure,which is based on the method of mode superposition and combining the testing result of the dynamic displacement,is available in theory and in practice.And it provides a new way to test the dynamic stress of a structure.
When the pulsating load,such as water wind and earthquake,acts on a large-scale structure or building,vibration will be induced.Sometimes vibration will endanger the safety of a structure and even destroy it.When the structure vibrates,its dynamic stress will be induced.As far as the present research is concerned,it is still difficult to test the dynamic stress directly.However,it is easy to test the dynamic displacement of a structure.In this paper,a new way will be introduced,that is,the dynamic stress can be calculated by testing the dynamic displacement of a structure combining the method of mode superposition.Then the result can be used to evaluate the safety of the structure.The measure,which is based on the method of mode superposition and combining the testing result of the dynamic displacement,is available in theory and in practice.And it provides a new way to test the dynamic stress of a structure.
引文
[1]傅志方,华宏里.模态分析理论与应用[M].上海:上海交通大学出版社,2000.
[2]房震,余湘娟,杨付权.一种求解动应力的新方法[J].水文地质工程地质,2002,(2):15-17.
[3]李利红,崔赞洙,杨国范.用有限元法对地震动应力分析[J].农业工程科学,2006,(2):397-400.
[4]吴健,金峰,徐艳杰.多维地震个方向相关性对拱坝动应力的影响[J].地震工程与工程振动,2005,(4):50-54.
[2]房震,余湘娟,杨付权.一种求解动应力的新方法[J].水文地质工程地质,2002,(2):15-17.
[3]李利红,崔赞洙,杨国范.用有限元法对地震动应力分析[J].农业工程科学,2006,(2):397-400.
[4]吴健,金峰,徐艳杰.多维地震个方向相关性对拱坝动应力的影响[J].地震工程与工程振动,2005,(4):50-54.
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