基于响应面法的大跨径斜拉桥静力参数敏感性分析  

Analysis of Static Parameter Sensitivity of Long-span Cable-stayed Bridge Based on RSM

作　　者：刘剑[1] 王达[2] 

机构地区：[1]中南林业科技大学土木工程与力学学院,湖南长沙410004 [2]长沙理工大学土木与建筑学院,湖南长沙410064

出　　处：《公路交通科技》2015年第8期100-106,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51408615;51308071)

摘　　要：为了研究各设计参数对大跨度斜拉桥结构响应的影响程度,采用响应面法(RSM)构建结构响应与设计参数之间的显式响应方程,对大跨度斜拉桥进行参数敏感性分析。以某大跨径斜拉桥为研究对象,采用ANSYS有限元程序建立有限元模型,模型中考虑了拉索弹模、拉索索力、主梁刚度、主梁体积重量、桥塔刚度及桥塔体积重量6个主要设计参数,通过显式响应方程求解各设计参数对结构响应的敏感因子,掌握大跨度斜拉桥结构内力、变形及拉索索力随着设计参数改变的变化趋势。并首次提出根据敏感百分比的大小将结构设计参数分为4个重要性等级,定量区分各设计参数对结构响应的影响程度。结果表明:同一设计参数对不同结构响应的影响程度是不一致的,不能笼统的认为某一设计参数是否重要,采用响应面法对大跨径斜拉桥进行参数敏感性分析切实可行。To research the impact of various design parameters on structural response of long-span cablestayed bridge, the explicit response equation between design parameters and structure response is constructed by using the response surface method （RSM） to analyze the of parameter sensitivity of long-span cable-stayed bridge. Taking a long-span cable-stayed bridge as the research object, its finite element model is built by ANSYS FE program. The model considers 6 main design parameters, including elastic modulus of cable, force of cable, rigidity of girder, unit weight of girder, rigidity and unit weight of bridge pylon, and solves the sensitive factors of these design parameters to the structure through the explicitly response equation, it could helps to know the tendency of internal force, deformation and cable force of long-span cable-stayed bridge varying with the design parameters. It is first put forward that the design parameters are divided into 4 importance rating according to the value of its sensitive percentage, which could quantitatively distinguish the influence degree of the design parameters on the structural response. The result shows that （ 1 ） the impact of the same design parameter on different structure response is unequal, it should not generally think that a certain design parameters is important; （2） it is feasible to use RSM to analyze the parameter sensitivity of long-span cable-stayed bridge.

关 键 词：桥梁工程 斜拉桥 响应面法 敏感性分析 敏感因子 敏感百分比 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]