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为了解决传统方法计算拱坝随机振动效率较低的问题 ,将虚拟激励法和精细直接积分方法结合 ,针对虚拟激励法中荷载为振荡函数的特点提出了振荡函数的精细直接积分法并应用于拱坝地基动力相互作用的有限元边界元无限边界元 (FE- BE- IBE)耦合模型中。以某拱坝为例对Wilson- θ法、Cotes积分法和振荡函数的精细直接积分法进行了比较计算。结果表明 ,精细直接积分方法可以在保证计算精度的前提下增大计算时步的步长 ,提高计算效率 30～4 0倍 ;精细直接积分法中振荡函数的精细直接积分法效率更优于 Cotes积分方法
In order to solve the problem of the traditional method of calculating the random vibration of arch dam, the virtual direct excitation method and the fine direct integral method are combined. According to the characteristics of the load in the virtual excitation method as the oscillation function, a precise direct integration method of the oscillation function is proposed and applied to the arch Finite element boundary element finite element boundary element (FE-BE-IBE) coupled model of dynamic interaction of dam foundation. Taking an arch dam as an example, the precise direct integration method of Wilson-θ method, Cotes integral method and oscillatory function are compared and calculated. The results show that the precise direct integration method can increase the step-by-step calculation time and improve the computational efficiency by 30 ~ 40 times with the premise of ensuring the accuracy of the calculation. The precise direct integration method of the fine direct integral method is more efficient than the Cotes Integral method