响洪甸拱坝的动水压力响应分析——考虑水库边界吸收作用的影响

Hydrodynamic pressure response analysis of Xianghongdian arch dam——taking account of the effects of reservoir boundary absorption

本文用有限元子结构方法分析响洪甸拱坝的动水压力,以广义座标及振型迭加法求解满库坝体的位移响应,分析中考虑了不同的库底淤积层边界条件,在简谐激振下,计算得到的动水压力分布与原型实测结果符合良好,对不同水库模型(包括空库,满库不可压缩,满库可压缩库底刚性反射、库底均匀吸收以及库底粘弹性非均匀吸收等)进行了简谐激振分析,得到了动水压力与坝体位移的频率响应曲线,从中获得了若干有关库水压缩性影响的规律性认识,

The hydrodynamic pressure on Xiang Hong Dian arch dam has been analyzed by using finite element-substructure method in the paper. Displacement response of the dam under full reservoir is calculated by means of generalized coordinate and mode superposition. The different kinds of boundary condition of the reservoir bottom were taken into account in the analysis. Under harmonic excitation the hydrodynamic pressure distribution obtained by calculation excellently agrees with the prototype testing results. The harmonic excitation analysis for various reservoir models (including empty reservoir, full reservoir with imcompressible liquid, full reservoir with compressible liquid and reflection of rigid bottom, homogeneous absorption of reservoir bottom, and inhomogeneous absorption of reservoir bottom with visco-clastic characterastics) is carried out, and the frequency response curves of hydrodynamic pressure and displacement of the dam are obtained. From the results, knowledge about the regularity of reservoir compression effects is acquired.