摘要
借鉴地震预报中的加卸载响应比理论,将作用在动力模型上的地震力视为加卸载,采用动力有限单元法和加卸载响应比理论开展全时程动力分析,建立了地震加卸载响应模型,采用相对位移(速度、加速度)作为响应参数,对地震过程加卸载响应比理论在动力响应预报方面进行了有益探索。结果表明,由于相对响应参数比绝对响应参数更能体现动力模型的变形趋势,反映动力荷载的作用机制;以加卸载响应比判断地震稳定性,是可以反映动力响应程度大小的一种有效方法。
Borrowing the idea of load/unload response theory in seismic prediction,seismic dynamic model is established,in which seismic acceleration on the boundary is regarded as load/unload process and relative displacement,velocity or acceleration is looked upon as response parameters,whole time history analysis is performed by finite element method and load/unload response theory,favourable exploratory of the application in dynamic response prediction is then attained through the above-mentioned theories. The results indicate that relative response parameters are more applicable of describing structure deformation,reflecting the dynamic mechanism of action than absolute displacement. Using Load/unload dynamic response ratio to identify the damage degree under seismic waves turns out to be an effective method reflecting the response degree.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期743-747,共5页
Rock and Soil Mechanics
基金
国家自然基金重点资助项目(No.50539110)
关键词
动力响应
加卸载规律
绝对动力响应
相对动力响应
dynamic response
load/unload law
absolute dynamic response
relative dynamic response
