单向及双向输入地震波对拱坝系统的影响

采用ADINA有限元软件建立三维的拱坝-库水-淤沙-地基耦合模型,分别以人工合成地震波水平记录计算输入的单向及双向地震波,改变激励方向,分析了坝体、坝基的位移及应力响应。结果表明,双向输入地震波下,拱坝体系各监测点的位移和应力响应明显大于单向输入时的情况,同时,位移和应力的最大值与激励角度有关,最不利输入角度处于-40°~-90°之间。

Influence of Unidirectional and Bidirectional Input Seismic Waves on Arch Dam System

The three-dimensional coupling model of arch dam-reservoir water-silt-foundation was established by using finite element software ADINA.The input unidirectional and bidirectional seismic waves were recorded and calculated by using synthetic seismic waves horizontally.The excitation direction was changed,the displacement and stress response of the dam body and foundation were analyzed.The results show that the displacement and stress responses of the monitoring points of the arch dam system under the bidirectional input are obviously larger than those under the unidirectional input.Meanwhile,the maximum displacement and stress are related to the excitation angle,and the most unfavorable input angle is between -40° and -90°.