基于大坝地震响应的参数反演方法研究

确定合理的参数是对基于大坝的地震响应进行正确分析的前提,利用反分析理论,探讨了大坝的力学参数确定方法。建立了地震荷载响应下的位移统计模型,推导出改进的目标函数形式,并结合遗传算法,以某大坝为例建立有限元模型,编制计算程序,对系统的力学参数进行优化反演,求出待定参数,进行对比验证。结果表明,反演所得参数准确,说明该方法合理可行,对分析大坝性态有重要参考价值。

Study of Parameter Inversion Method Based on Seismic Response of Dam

Reasonable parameters is the premise of correct analysis for dam. Based on the seismic response of dam, the method of mechanical parameter determination is studied by using back analysis theory. Firstly, the displacement statistical model under seismic load response is built, and a modified objective function is deduced. Then, the finite element model of a dam and the calculation procedure combined with genetic algorithm are developed. Finally, the mechanical parameters of the system are inversed and optimized, as well as verified. The results show that the inversed parameters are correspondingly accurate, and the mechanical parameter method based on the seismic response of dam is reasonable and feasible, which may have significant reference value for analyzing the behaviors of dam.