An improved method of hydrodynamic pressure calculation for circular hollow piers in deep water under earthquake
An improved method of hydrodynamic pressure calculation for circular hollow piers in deep water under earthquake
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DOI：
10.1016/j.oceaneng.2013.07.001
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发表时间：
2013-11
影响因子：
5
通讯作者：
Qiao Li;Wanli Yang
中科院分区：
文献类型：
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作者：
Qiao Li;Wanli Yang
地震作用下，水库中圆柱形空心墩的动水压力与海洋结构物的动水压力不同。外水和内水引起的动水压力表达式复杂，计算困难。为了提高它们的适应性，本文对它们进行了修改和简化。将动水压力表达式中提取的附加质量和附加阻尼引入标准受迫振动控制方程，得到了修正的控制方程和考虑动水压力的深水桥墩整体数值计算模型。证明了自由表面波及其附加阻尼可以忽略不计，弹性振动引起的附加质量可以近似地用桥墩刚体运动引起的附加质量代替，后者的表达式又可以用曲线拟合得到的简单表达式代替。对比研究表明，简化后的表达式不仅方便，而且具有足够的精度，可供实际应用。通过实例分析，揭示了附加质量对桥墩地震反应的强化作用.
Hydrodynamic pressure for cylindrical hollow piers standing in reservoir under earthquake differs from those of offshore structures. Hydrodynamic pressure expressions caused by outer water and inner water are so complicated that their solutions are difficult to calculate. Modification and simplification are performed to improve their adaptabilities in the paper. Added mass and added damping extracted from the hydrodynamic pressure expressions are incorporated into standard forced vibration governing equation, the modified governing equation and the modified numerical calculation model for a whole deep water pier considering hydrodynamic pressure are obtained. Free surface wave and its resulting added damping are proved to be negligible, added mass caused by elastic vibration can be approximately substituted by one caused by rigid motion of pier, and the expressions of the latter are further substituted by simple expressions obtained by curve fitting. Comparison studies show that the simplified expressions are not only convenient but also accurate enough for practical application. Also application is presented and how added mass intensifies seismic response of pier is revealed.