2012年11月第11期(总170)铁道工程学报JOURNALOFRAILWAYENGINEERINGSOCIETYNov2012NO.11(Ser.170)收稿日期:2012-07-10作者简介:张运波,1971年出生,男,副教授;孙立伟,1985年出生,男,助理工程师。文章编号:1006-2106(2012)11-0049-05车辆超载对矮塔斜拉桥可靠度影响分析张运波孙立伟(石家庄铁道大学,石家庄050043)摘要:研究目的:由于我国现代化工业建设的快速发展,致使运营车辆超载现象成为常态。超载问题将会直接造成在役桥梁的损伤,削弱结构的耐久性能,致使桥梁承载潜力降低,甚至危及安全运营。本文以一实际矮塔斜拉桥为工程背景,以大型有限元分析软件MIDAS/CIVIL为分析为手段,以疲劳可靠度理论为基础,对车辆超载工况下矮塔斜拉桥的受力影响进行有限元模拟分析,研究车辆超载对斜拉索疲劳可靠度的影响。研究结论:(1)通过有限元计算不同荷载工况下拉索的应力幅值和疲劳可靠度值,可知在120t活载作用下,其拉索的疲劳可靠度降到了0.8左右。(2)设计单位应充分认识重车以及超载车辆对桥梁结构影响的重要性,从设计阶段就考虑超载车辆对桥梁结构的影响,以提高桥梁结构的安全性以及使用寿命。关键词:车辆超载;疲劳可靠度;长期变形中图分类号:U443文献标识码:AAnalysisofInfluenceofVehicleOverloadonReliabilityofLow-towerCableStayedBridgeZHANGYun-bo,SUNLi-wei(ShijiazhuangRailwayUniversity,Shijiazhuang,Hebei050043,China)Abstract:Researchpurposes:WiththefastdevelopmentofChina'smodernizedindustry,thephenomenonofvehicleoverloadbecomespopularanditwoulddamagethebridgeandweakenthebridge'sdurability,resultinginreductionoftheloadbearingcapacityofthebridgeindifferentdegrees,andevenendangeringthebridge'ssafeoperation.Takingthelow-towercablestayedbridgeastheengineeringbackground,takingthefiniteelementsoftwareMIDAS/CIVILastheanalysismeansandtakingthefatiguereliabilitytheoryasthebase,thefiniteelementsimulationanalysisoftheinfluenceofthevehicleoverloadontheloadbearingoflow-towercablestayedbridgewasmadeandtheresearchwasdoneontheinfluenceofvehicleoverloadonthefatiguereliabilityofthestaycable.Researchconclusions:(1)Fromthefiniteelementcalculationofthestressrangeandfatigueofthestaycableunderthedifferentloads,itcanseenthefatigue...