混凝土的动力特性与拱坝的非线性地震响应

Dyanmic behavior of concrete and nonlinear seismic response of arch dam

总结分析了混凝土材料的动力特性及其在大坝抗震设计中应用的发展现状及其存在的问题。应用一致黏塑性模型研究了混凝土的应变速率相关特性对结构动力响应的影响。发现动荷载作用过程应变速率变化对结构的变形、应力大小与应力分布均发生影响。最后 ,研究了地震作用下高拱坝应变率沿坝体的分布 。

The state of the art of experimental research on dynamic behavior of concrete and its application to aseismic design of dams are briefly reviewed and critically assessed.By employing the viscoplastic consistency model,the strain rate effect of concrete on dyanamic response of structures is studied.It was found that the magnitude and distribution of displacement and stress of the structures are affected greatly.As an example,the strain rate distribution of a high arch dam subjected to earthquke excitation is calculated and the nonlinear stress response and crack development of the dam are also calculated and examined.It is concluded that the strain rate effect has important significance in aseismic safety evaluation of high concrete dams.