【摘要】 基于有限元法,采用振型分解反应谱法研究了在中等偏硬坝基上坝体弹模和坝高对重力坝动力特性及地震响应的影响规律。通过对不同坝体弹模和高度重力坝动力响应规律对比分析得出:随着坝体刚度的增大,坝顶加速度减小,坝头部位的竖向动应力减小;坝顶加速度响应受坝高的影响不显著,坝头部位的竖向动应力在坝高为100 m时最大。同时通过对牙根二级水电站不同高度挡水坝段进行动力分析,论证了上述结论 。更多还原

【Abstract】 Based on finite element method, the modal response spectrum method is used to study the influences of elastic modulus and height of dam loeated on medium or more rigid foundation on the dynamic characteristics and seismic response of gravity dam. The comparison of dynamic responses of gravity dams with different elastic modulus and height shows that,(a)with the increase of dam stiffness, the acceleration of dam crest will decrease and the vertical dynamic stress of dam abutment will decrease; and(b) the acceleration response of crest is not significantly affected by dam height, but the vertical dynamic stress of dam abutment will be maximum when the dam height is 100 m. The dynamic analyses for the water retaining sections of the gravity dam in Yagen II Hydropower Station demonstrate above conclusions.更多还原