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桥梁群桩基础-水耦合系统动力特性数值模拟

ISSN号：1000-4750
期刊名称：工程力学
时间：2011
页码：195-200
分类：U443.13[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程] U441.3[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]同济大学土木工程防灾国家重点实验室,上海200092
相关基金：国家自然科学基金项目（50778131 50978194 90915011）
相关项目：超大跨深水基础桥梁强震灾变过程及控制研究

关键词：深水群桩基础, 动力特性, 结构-水相互作用, 完全数值方法, 势流体单元, deepwater pile-group foundation, dynamic analysis, water-structure interaction, complete numerical method, potential-fluid element

中文摘要：

该文首先介绍了基于势流体单元的结构-水相互作用完全数值分析方法,并对基于该方法的桥梁群桩基础-水耦合系统动力特性分析的实现及建模进行了研究。以某深水桥梁群桩基础为工程背景,利用有限元分析软件ADINA分别建立了结构的三维实体单元和水体的势流体单元模型,分析了结构在不同水深条件下的动力特性。基于简化模型,通过参数分析研究了桩基、承台的设计与流固耦合效应间的关系。主要结论有利用完全数值分析方法进行结构-水耦合系统的动力特性分析是有效的,但分析结果收敛性受流固边界两侧网格尺寸控制;水体-结构相互作用对结构动力特性有明显影响,水深越大,影响越强;桩基、承台的设计都会对水-结构相互作用产生影响,通过合理设计可以减小水体对结构振动的影响。

英文摘要：

The numerical method for fluid-structure interaction analyses based on potential-fluid element was introduced,then the detail of the water-group pile foundation interacted modeling was studied.Taking a deepwater group pile foundation of a bridge as an example,a three-dimensional solid finite element model of the structure and a potential fluid model of water were built in finite element analysis program ADINA,and the dynamic analyses of the model with different depth of water were carried out.In order to investigate the relationship between the hydrodynamic influence and the design geometry of piles and caps,parameter analyses were performed.Main conclusions are： the complete numerical method is an efficient method for dynamic analysis of water-structure interacted system;the convergence of analyses was controlled by the ratio of the gird size of fluid elements on the fluid-structure interface to that of adjacent solid elements;the water-structure interaction has significant influence on dynamic characteristics of the deepwater bridge group foundation;the design of caps and piles causes variation of the fluid-structure interaction,and the hydrodynamic influence can be reduced through reasonable design.

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