挡水坝地震反应上限基于动水压力影响矩阵(系数)的估算

UPPER BOUND ESTIMATION OF SEISMIC RESPONSES OF RESERVOIR

重力型挡水坝的型体及与相邻坝段的连接都很复杂,加之还有动水压力的作用,结构刚度分布不易清楚确定。本文建议用最不利变形曲线替代振型,无需知道刚度的分布,便能借助动水压力影响矩阵解得水平地震作用下的地震荷载、剪力及弯矩的上限,地震应力的计算可进一步通过静力分析确定。

The rigidity distribution of the gravity dam is usually determined with many difficulties because of complication of its geometry and the connection with the adjacent portion of the reservoir, as well as the action of hydrodynamic pressure.In this paper, an approach is suggested to evaluate the upper bound responses of the seismic loads, shearing forces and bending moments under the action of horizontal earthquake with the help of the influence matrix of hydrodynamic pressure and the substitution of the most unfavourable possible deformation curves for the normal modes under the condition of unknown rigidity distribution.