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针对地震作用下计算边界宽度对倒虹吸结构的动力响应情况,以南水北调中线某箱形倒虹吸结构为例,地基采用Mohr-Coulomb非线性本构模型,输入人工地震波,利用ADINA软件在静力基础上进行重启动分析,同时对ADINA进行二次开发,实现了循环计算。结果表明,边界宽度对倒虹吸结构的应力和位移值影响不超过10%,且当达到7倍宽度后,基本趋于稳定,而3倍宽度的倒虹吸结构的加速度放大系数较好,且加速度误差也在工程误差范围内。
Aimed at the dynamic response of inverted siphon structure under the action of earthquake, taking a box inverted siphon structure in the middle line of South-to-North Water Transfer Project as an example, the nonlinear Mohr-Coulomb constitutive model was used for the foundation. The artificial seismic wave was input into the foundation. On the restart analysis, while the second development of ADINA, to achieve a loop calculation. The results show that the influence of the boundary width on the stress and displacement of the inverted siphon structure does not exceed 10%, and when the width reaches 7 times the width, it basically stabilizes, while the acceleration amplification factor of the inverted siphon structure with 3 times width is better. The error is also within the scope of engineering error.