古田溪一级重力坝悬臂梁振型分解反应谱法抗震计算

Cantilever seismic calculation of mode-superposition response spectrum method for the gravity dam of Gutianxi first cascade

本文提出了重力坝悬臂梁材料分区规则 ,按此规则可确定任一水平条块的材料组成、形状、大小与位置。在振型分解反应谱法抗震计算中 ,提供了不等间距的悬臂梁柔度计算公式 ,考虑了地震动水压力的作用与地基弹性的影响 ,研制了相应的计算程序。利用该程序对古田溪一级重力坝进行了地震烈度 7度的抗震计算 ,得出了一些有价值的结论。典型坝段的计算结果规律性强 ,自振周期与有限元法结果基本一致 ,表明本文的方法与程序是正确可靠的 ,可用于重力坝抗震设计。

The material zoning of cantilever for gravity dam is presented in the paper,on the basis of which the material components,the shape,the size and the location of any horizontal block can be easily determined.On the mode superposition response spectrum method,the flexibility equations of the cantilever with inequable length elements are provided.By considering of the dynamic water pressure and foundation elasticity,a relevant computer program is developed.By using this program,seismic computation of the gravity dam of Gutianxi first cascade under the earthquake intensity of 7 degrees is carried out,and some valuable results are obtained.The present correct and feasible method and computer program can be used for the seismic design of gravity dam due to the regularity of the computed results and the agreement of computed periods with FEM for the typical monolith.