考虑不同桩土效应分析模型的双座串联斜拉桥动力特性分析  

Dynamic Characteristics Analysis of Two Series-connected Cable-stayed Bridges Considering Different Pile-soil Effect Analysis Models

作　　者：黄鸣柳 沈文爱 胡宇航 朱宏平[1] 何友娣[2] HUANG Ming-liu;SHEN Wen-ai;HU Yu-hang;ZHU Hong-ping;HE You-di(School of Civil Engineering&Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China;China Railway Major Bridge Reconnaissance&Design Institute Co Ltd,Wuhan 430056,China)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《土木工程与管理学报》2020年第5期137-141,168,共6页Journal of Civil Engineering and Management

基　　金：中铁大桥勘测设计院集团有限公司科技项目;国家自然科学基金(51838006)。

摘　　要：以双座串联大跨度斜拉桥——洪鹤大桥为背景,利用Midas/Civil分别建立了采用直接嵌固模型、等效嵌固模型、六弹簧模型、Winkler地基梁模型共四种不同桩土效应分析模型下的的全桥有限元模型,并对所有的有限元模型进行了动力特性分析。分析结果表明:双座串联大跨度斜拉桥具有自振周期较长、自振频率较低、模态密集、振型在东西桥交替出现等特点。同时发现考虑桩土作用会降低结构的整体刚度,延长结构的自振周期,会改变高阶振型,不同桩土效应模型对结构动力特性影响效果不同。对于软土场地上的大跨度斜拉桥推荐使用六弹簧模型和温克尔地基梁模型模拟桩土效应。Based on the background of Honghe Bridge,a long-span cable-stayed bridge in series,the finite element models of the whole bridge under four different pile-soil effect analysis models,namely direct embedded model,equivalent embedded model,six-spring model and winkler foundation beam model,are established using Midas/Civil,and the dynamic characteristics of all the finite element models are analyzed.The analysis results show that:the double series-connected long-span cablestayed bridge has the characteristics of long-span natural vibration period,low natural frequency,dense modes and alternate mode shapes in the east-west bridge.At the same time,it is found that considering the pile-soil effect,the overall stiffness of the structure will be reduced,the natural vibration period of the structure will be prolonged,and the high-order vibration mode will be changed.And different pile-soil effect models have different effects on structural dynamic characteristics.The six-spring model and winkler foundation beam model are recommended to simulate the pile-soil effect for large span cable-stayed bridges at soft soil sites.

关 键 词：桩土效应 动力特性 双座串联 大跨度斜拉桥 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]