拱坝横缝非线性动力响应的模型试验和计算分析

Shaking table tests and numerical analysis for nonlinear seismic behavior of an arch dam model with contraction joints

本文采用脆性材料 (重晶石膨润土混合料 )制作的拱坝模型来研究拱坝横缝的非线性动力响应。通过振动台输入谐波和地震波对模型拱坝进行动力试验 ,并运用拱坝非线性分析有限元程序ADAP - 88来进行计算比较 ,试验结果验证了数值模型的可行性 ,揭示了带横缝拱坝在地震荷载作用下的反应规律。此外 。

Using an arch dam model tested on a shaking table,some nonlinear seismic behaviors of arch dams with contraction joints are studied in this paper.Under a series of harmonic and earthquake wave loadings,the joint opening behaviors and acceleration responses of the arch dam model were tested.The experimental results are compared with the results of numerical analysis by a finite element program—ADAP-88(Arch Dam Analysis Program,presented in 1988)—under the same dynamic loadings.The comparisons show that the numerical model used in ADAP-88 is reasonable for nonlinear analysis of arch dams with contraction joints.In addition,some seismic behaviors of arch dams with opening contraction joints are discussed from both experimental results and results of numerical analysis.