Effects of Dynamic Fluid-Structure Interaction on Seismic Response of Multi-Span Deep Water Bridges Using Fragility Function Method
Effects of Dynamic Fluid-Structure Interaction on Seismic Response of Multi-Span Deep Water Bridges Using Fragility Function Method
复制标题
利用脆弱性函数法研究动态流固耦合对多跨深水桥梁地震响应的影响
DOI：
10.1260/1369-4332.18.4.525
复制
发表时间：
2015-03
影响因子：
2.6
通讯作者：
Shen, Guoyu
中科院分区：
文献类型：
--
作者：
Pang, Yutao;Kai, Wei;Yuan, Wancheng;Shen, Guoyu
采用脆性函数法研究了多跨深水桥梁流固动力相互作用对地震反应的影响。目前，研究结构的流固动力相互作用效应的方法主要有两种：解析的附加质量法和全尺寸的二维或三维有限元法。本文提供了一个计算经济，但足够的程序。该方法采用莫里森方程计算桩和柱的附加质量，建立水-地基耦合系统模型计算承台的附加质量。在该水-地基耦合体系中，采用桩梁单元，避免了对水域的深入模拟。以我国一座典型的深水多跨连续组合梁桥为研究对象。模型参数的不确定性被认为是使用实验设计方法。极限状态函数是通过一个简单的模糊模型。采用非线性时程分析方法，建立了墩柱和桩基的脆性函数。然后比较了模糊模型中不同参数和不同水深条件下的脆性曲线，以说明模糊性和地震动水压力的影响。一般情况下，对于只有桩周围水的桥梁，水对桥梁潜在破坏的影响很小，实际上可以忽略不计。但是，对于承台处于水下的情况，增加水深一般会增加承台的破坏概率。结果表明，对于深水桥梁，流固动力相互作用的影响对桥梁的响应是不利的，其影响随着水深的增加而增大，主要表现为承台位移的增加和墩柱地震反应的增加。
This paper employs the fragility function method to study the effects of dynamic fluid-structure interaction on seismic response of multi-span deep water bridges. Currently, two approaches are widely used to study the dynamic fluid-structure interaction effect of structures: the analytical ‘added mass’ method and full-scale two- or three dimensional finite element modeling. This paper offers a computationally economical yet adequate procedure. In this procedure, Morrison equation is employed to calculate the added mass for piles and columns, and a water-foundation coupling system is modeled to calculate the added mass for pile cap. In this water-foundation coupling system, a pile beam-element was adopted to avoid the thorough water domain modeling. A typical multi-span continuous composite girder bridge in China lying in deep water environment is used as a case study. The uncertainty of modeling parameters is considered using an experimental design method. The limit state functions are derived through a simple fuzzy model. Fragility functions of pier column and pile foundation are developed using nonlinear time history analysis. Fragility curves conditioned on different parameters in fuzzy models and different water depth are then compared to illustrate the effects of fuzziness and seismic hydrodynamic pressure. In general, for bridges with only pile surrounding water, the influence of water on potential damage of bridges is small and can be practically negligible. However, for the cases which the pile cap is under the water, increasing the water depth can generally increase the damage probability. It is concluded that for deep water bridges, the influence of dynamic fluid-structure interaction can be harmful to bridge responses, which aggravates with water depth by increasing the displacement of pile cap and introducing larger seismic demands on pier columns.
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影响因子：
3.6
作者：
Bayram Aygün Aygün-Bayram-Aygün-Aygün-2123231221;L. Dueñas-Osorio;J. Padgett;R. DesRoches
通讯作者：
Bayram Aygün Aygün-Bayram-Aygün-Aygün-2123231221;L. Dueñas-Osorio;J. Padgett;R. DesRoches
影响因子：
4.5
作者：
Padgett, Jamie E.;DesRoches, Reginald
通讯作者：
DesRoches, Reginald
影响因子：
4.5
作者：
J. Padgett;B. G. Nielson;R. DesRoches
通讯作者：
J. Padgett;B. G. Nielson;R. DesRoches
DOI：
10.1061/(asce)st.1943-541x.0000231
发表时间：
2010-11
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
M. Barbato;Q. Gu;J. Conte
通讯作者：
M. Barbato;Q. Gu;J. Conte
DOI：
--
发表时间：
1981
期刊：
--
影响因子：
--
作者：
K. Ang
通讯作者：
K. Ang