随机车辆荷载作用下斜拉索索力的概率模型及可靠度分析  

Analysis of Probabilistic Model of Stay Cable Stress and Reliability Under Random Vehicle Loads

作　　者：杨晓艳[1] 贡金鑫[1] 张启伟[2] 

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024 [2]同济大学桥梁工程系,上海200092

出　　处：《建筑科学与工程学报》2014年第2期90-98,共9页Journal of Architecture and Civil Engineering

基　　金：交通运输部西部交通建设科技项目(2008 318 494 04)

摘　　要：以苏通长江大桥为工程背景，计算了随机车辆荷载作用下的斜拉索索力，采用随机过程的跨阈理论建立了斜拉索索力的概率模型，在此基础上对随机车辆荷载作用下斜拉索的可靠度进行分析。结果表明：斜拉索索力可以采用高斯平稳随机过程描述；设计基准期内斜拉索索力最大值的概率模型可通过跨闽理论确定；按随机车流数据建立的车辆荷载概率模型计算的斜拉索可靠指标为7．93～14．55。Taking Sutong Yangtze River Bridge as a project background, the stay cable stress under random vehicle loads was calculated and the probability models of stay cable stress underrandom vehicle loads were developed based on the stochastic process theory. Then the reliability of stay cable under random vehicle loads was analyzed. The results show that the stay cable stresscan be modeled by a Gaussian stationary stochastic process and the probability function of maximum stay cable stress can be determined using up-crossing theory. The stay cable reliabilityindex was from 7.93 to 14.55 for the long span cable-stayed bridge under random vehicle loads.

关 键 词：斜拉桥 索力 车辆荷载 概率模型 可靠度 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]