动力时程响应的加卸载响应比描述研究

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。

Dynamic stability research by using load/unload ratio method

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.