基于贝叶斯理论的随机风荷载作用下悬索桥颤振可靠性分析  

Reliability Analysis of Suspension Bridge Flutter under Stochastic Wind Loading Based on Bayesian Theory

作　　者：楼灿洪 董峰辉[2] DONG Feng-hui(Department of Bridge Engineering/Chang’an University,Xi’an 710064,China;Department of Bridge Engineering/Tongji University,Shanghai 200092,China)

机构地区：[1]长安大学公路学院桥梁工程系,陕西西安710064 [2]同济大学土木工程学院桥梁工程系,上海200092

出　　处：《山东农业大学学报（自然科学版）》2018年第2期247-251,共5页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：中央高校基本科研业务费专项资金(CHD2012JC077);中央高校基本科研业务费高新技术研究项目(CHD0009-2014G2210001);广东省交通运输厅科技重大工程专项(2011-01-001);陕西省交通运输厅科技项目(15-18K)

摘　　要：为分析随机风荷载作用下悬索桥颤振可靠性,本文基于贝叶斯理论预测极值的风速的方法,建立适用于大跨度悬索桥颤振分析模型。在建立结构极限状态方程中,选取颤振临界风速、风速转换因子、阵风因子和桥址处设计风速作为基本随机变量,基于FERUM软件采用一次二阶矩中的JC法来求解大跨度悬索桥结构在随机风荷载作用下的颤振可靠度指标。结果表明,该方法与传统方法相比较,更加准确、客观,具有良好的工程应用价值和实用意义。To analyze the reliability of suspension bridge flutter under stochastic wind loading,this paper established the model being suitable for analyzing the flutter of long-span suspension bridge flutter based on the method of forecasting extreme air speed in the Bayesian theory.In the course of establishing the limit state equation,flutter critical wind speed,conversion factor,gust factor and extreme wind speed at the bridge site were selected as elementary random variables,JC method in linear order second moment based on FERUM was used to calculate the flutter reliability indices of the long-span suspension bridge.The results indicated that this method was more precise and objective than traditional one and had high value in application to practical engineering.

关 键 词：贝叶斯理论 风荷载 悬索桥 颤振 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]