微幅晃动下考虑地基效应的矩形贮液结构动力响应研究剖析.doc

微幅晃动下考虑地基效应的矩形贮液结构动力响应研究 程选生景 伟*李国亮李 德马 亮 （兰州理工大学 土木工程学院 甘肃，兰州730050 摘 要：一般情况下矩形贮液结构通过底板直接坐落在地基上，有必要在考虑地基效应的基础上研究其动力特性。定义了微幅晃动波高限值，建立了矩形贮液结构的简化模型。采用人工边界模拟地基效应，建立了有限元计算模型，对比了两类模型对应的晃动波高，基于势流理论在微幅晃动范围内研究了不同边界条件、不同地震波和不同地震加速度幅值下矩形贮液结构的动力响应。结果表明，两类模型得到的晃动波高趋势一致，且最大晃动波高相差较小。在微幅晃动范围，液体最大晃动波高和地震加速度幅值成线性关系，考虑土-结构相互作用后，壁板水平位移、壁板有效应力和液体晃动压力有较大程度的的减小，而地基效应对液体晃动波高影响很小。 关键词：微幅晃动；土-结构相互作用；矩形贮液结构；粘弹性边界；流-固耦合；动力响应 中图分类号：TU357 文献标识码：A DOI: Dynamic response of rectangular liquid-storage structure considering foundation effect under small amplitude sloshing CHENG Xuan-sheng, JING Wei, LI Guo-liang, LI De, MA Liang (School of Civil Engineering, Lanzhou University of Technology, Lanzhou, 730050, China) Abstract: Rectangular liquid-storage structure is often located on the foundation through the bottom plate, it is necessary to study the dynamic response characteristics on the basis of considering the foundation effect. The limit height of small amplitude sloshing is defined, the simplified model of the rectangular liquid storage structure is established. Using artificial boundary to simulate foundation effect, the finite element calculation model is established, comparing sloshing height corresponding to two kinds of models to verify the rationality of the simplified model. Based on the potential flow theory, the dynamic responses of rectangular liquid-storage structure with different boundary conditions, different seismic waves and different seismic acceleration amplitudes are studied. The results show that sloshing height trend of the two kinds of models is consistent, and the difference of maximum sloshing height is small. In the range of small amplitude sloshing, there is a linear relationship between the maximum sloshing height and the amplitude of earthquake acceleration, after considering soil-structure interaction, tank wall horizontal displacement, tank wall effective stress and liquid sloshing pressure have a greater degree of