摘要
以深水桥梁的单桩和群桩基础为背景,采用Fluent软件建立圆断面刚性柱体的流固耦合计算模型,采用数值模拟方法,研究了地震作用下水中单柱和多柱的动水压力问题。对于静水中运动的柱体和柱列,将其地震动水压力表达为与Morison方程相同的数学形式,采用最小二乘拟合方法得到惯性力系数和阻力系数,研究了惯性力和阻力在总动水压力中所占的比例。在此基础上通过单柱、双柱和4柱构形,研究了柱直径、柱间距、运动角度、表面波、柱入水深度、柱顶距离水表面距离等因素对动水压力的影响。通过对数值模拟结果的统计,建立了可以考虑上述因素的柱列地震动水压力的简化计算方法,便于水中桥梁抗震设计使用。
Based on single pile and pile group of deep water bridge and using Fluent software, this paper establishes the fluid-solid coupling calculation model of the rigid cylinder with circular section. A numerical simulation method was used to explore the dynamic water pressure of the single cylinder and cylinder group under excitation of the earthquake. For the single cylinder and cylinder group moved in static water, the seismic hydrodynamic pressure was expressed as the same form of the Mori^on＇ s equation. The inertia force coefficient and the drag force coefficient were obtained by use of the least square fitting method, then the ratios between the two forces and the tatal hydrodynamic pressure were discussed. Based on the arrangement of the single cylinder, double cylinder and four - cylinder, this paper analyzes the factors influencing dynamic water pressure, such as the diameter of cylinder, the distance between cylinder, angle of motion, surface wave, the water depth of cylinder, the distance from the top of the cylinder to water surface etc. A simplified method to calculate the dynamic water pressure of cylinder and cylin- der group with consideration of above factors is established, which is convenient for seismic design of bridge.
作者
高昊
赵东晓
黄勇
王君杰
GAO Hao ZHAO Dongxiao HUANG Yong WANG Junjie(School of Civil Engineeing, Tongji University, Shanghai 200092, China Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China)
出处
《世界地震工程》
CSCD
北大核心
2016年第4期203-214,共12页
World Earthquake Engineering
基金
国家重点基础研究发展计划(2013CB036305)
国家自然科学基金项目(51278373
51438010)
关键词
桩基础
桩柱
Morison方程
动水压力
惯性力系数
pile foundation
pile cylinder
Morison equation
dynamic water pressure
inertia force coefficient
