铁路钢桥承载能力极限状态目标可靠指标研究
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摘要
研究目的:以可靠度理论为基础的极限状态设计法是铁路工程结构设计规范发展的必然,而目标可靠指标是其重要组成部分,随着铁路事业的飞速发展,原有可靠指标校准值的基础条件部分发生了改变,这就需要结合新情况对铁路钢桥的承载能力目标可靠指标进行分析。研究结论:本文得到了新形势下铁路钢桥抗力统计参数,校准了铁路钢桥承载能力极限状态的目标可靠指标,得到了抗力、恒载和活载的分项系数,通过验证,满足由容许应力法向极限状态设计法转轨中安全度继承性的要求;通过对抗力和荷载参数的灵敏度分析,表明抗力和活载的统计参数对可靠指标影响权重大,而恒载的统计参数和恒载与活载标准值效应比影响权重较小。
Research purposes: Limit states design method based on reliability theory is the trend of development for the design code in railway engineering structures,and the target reliability index is an important part among it.With the rapidly development of railway industry,the basic conditions of the original calibrate value have partly changed,which requires analysis of target reliability index for steel railway bridges' ultimate limit states under the new situation. Research conclusions: Under the new situation,resistance statistical parameters of steel railway bridge have been listed.The target reliability indexes of ultimate limit states are calibrated.At the meantime,the partial factors of dead load and live load and resistance are advised,which can meet needs of safety requirements of inheritance in transition from the allowable stress method to limit states design through verification.According to the sensitivity analysis of load and resistance parameters,the statistical parameters of resistance and live load have a large effect on the reliability index,while the parameters of dead load and the ratio of dead load and live load have little effect on it.
Research purposes: Limit states design method based on reliability theory is the trend of development for the design code in railway engineering structures,and the target reliability index is an important part among it.With the rapidly development of railway industry,the basic conditions of the original calibrate value have partly changed,which requires analysis of target reliability index for steel railway bridges' ultimate limit states under the new situation. Research conclusions: Under the new situation,resistance statistical parameters of steel railway bridge have been listed.The target reliability indexes of ultimate limit states are calibrated.At the meantime,the partial factors of dead load and live load and resistance are advised,which can meet needs of safety requirements of inheritance in transition from the allowable stress method to limit states design through verification.According to the sensitivity analysis of load and resistance parameters,the statistical parameters of resistance and live load have a large effect on the reliability index,while the parameters of dead load and the ratio of dead load and live load have little effect on it.
引文
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[10]邓铁军.结构工程施工系统可靠性理论方法及其应用的研究[D].长沙:湖南大学,2007Deng Tiejun.Research on the Theory and Method ofReliability in Structural Engineering ConstructionSystem[D].Changsha:Hunan University,2007.
[2]GB 50153—2008,工程结构可靠度设计统一标准[S].GB 50153—2008,Unified Standard for ReliabilityDesign of Engineering Structures[S].
[3]赵万强.隧道衬砌结构可靠性设计浅论[J].铁道工程学报,2002(4):56-60.Zhao Wanqiang.Preliminary Discussion on ReliabilityDesign of Tunnel Lining Structure[J].Journal ofRailway Engineering Society,2002(4):56-60.
[4]潘际炎,张玉玲,张建民.铁路钢桥及其焊接接头可靠度设计研究[C]//工程结构可靠性—全国第四届学术交流会议论文集.北京:地震出版社,1996.Pan Jiyan,Zhang Yuling,Zhang Jianmin.Research onthe Reliability Design of Railway Steel Bridges and TheirWelding Joints C]//Reliability of EngineeringStructures—the 4th China Academic CommunicationConference Processdings.Beijing:Earthquake PublishCompany,1996.
[5]张玉玲,潘际炎.铁路临时桥梁结构强度可靠度设计研究[C]//工程结构可靠性—全国第四届学术交流会议论文集.北京:地震出版社,1996.Zhang Yuling,Pan Jiyan.Research on the StrengthReliability Design of Railway Temporary Bridges[C]//Reliability of Engineering Structures—the 4th ChinaAcademic Communication Conference Processdings.Beijing:Earthquake Publish Company,1996.
[6]李铁夫.铁路桥梁可靠度设计[M].北京:中国铁道出版社,2006.Li Tiefu.Design on Reliability for Railway Bridge[M].Beijing:China Railway Publishing House,2006.
[7]张玉玲.铁路工程结构极限状态设计通用方法及专业参数处理分析研究[R].北京:中国铁道科学研究院,2010.Zhang Yuling.Research on Universal Method andProfessional Parameters of Limit States Design forRailway Engineering Structures[R].Beijing:ChinaAcademy of Railway Sciences,2010.
[8]R.E.MELCHERS.Structural Reliability Analysis andPrediction[M].Elis Horwood Limited,1987.
[9]JTG D60—2004,公路桥涵设计通用规范[S].JTG D60—2004,General Code for Design of HighwayBridges and Culverts[S].
[10]邓铁军.结构工程施工系统可靠性理论方法及其应用的研究[D].长沙:湖南大学,2007Deng Tiejun.Research on the Theory and Method ofReliability in Structural Engineering ConstructionSystem[D].Changsha:Hunan University,2007.
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