既有预应力混凝土桥梁结构承载能力时变可靠度研究
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摘要
文章在研究了既有预应力混凝土桥梁抗力和荷载时变特性的基础上,建立了现有预应力混凝土桥梁抗弯承载能力的时变可靠度计算模型,讨论了结构时变可靠度的计算方法,编制了可靠度计算实用分析程序,计算了时变可靠度指标,以我国高速公路桥梁中广泛应用的多座预应力混凝土T梁桥为例,在考虑其抗力时变特性的理论基础上,研究承载能力可靠度的衰减规律。
In this paper,based on the study of the stress and load time-dependent characteristics of the existing prestressed concrete bridges,aprobabilistic model of resistance for the strength limit state for flexural capacity is established,the time-dependent reliability analysis methods are discussed,the program composition with C++ is made to calculate the time-dependent reliability index of flexural capacity.Based on the time-dependent characteristics of existing prestressed concrete bridges and the analysis of the deficiency of time-dependent reliability index,a number of prestressed concrete T-girder bridges,which are widely used in highway bridges in China,are presented to study the attenuation law of the bearing capacity reliability.
In this paper,based on the study of the stress and load time-dependent characteristics of the existing prestressed concrete bridges,aprobabilistic model of resistance for the strength limit state for flexural capacity is established,the time-dependent reliability analysis methods are discussed,the program composition with C++ is made to calculate the time-dependent reliability index of flexural capacity.Based on the time-dependent characteristics of existing prestressed concrete bridges and the analysis of the deficiency of time-dependent reliability index,a number of prestressed concrete T-girder bridges,which are widely used in highway bridges in China,are presented to study the attenuation law of the bearing capacity reliability.
引文
[1]中华人民共和国交通部.公路工程结构可靠度设计统一标准:GB/T 50283—1999[S].北京:中国计划出版社,1999:2-5.
[2]贡金鑫,赵国藩.考虑抗力随时间变化的结构可靠度分析[J].建筑结构学报,1998,19(5):42-51.
[3]ENRIGHT M P.Reliability-based analysis of degrading reinforced concrete bridges[C]//Proceedings of the Workshop on Structural Reliability in Bridge Engineering,Boulder,Colorado.[S.l.:s.n.],1996:257-263.
[4]MORI Y,ELLINGWOOD B.Reliability-based service-life assessment of aging concrete structures[J].Journal of Structural Engineering,1993,119(5):1600-1621.
[5]“公路桥梁车辆荷载研究”课题组.公路桥梁车辆荷载研究[J].公路,1997(3):7-12.
[6]张建仁.现有混凝土桥梁结构基于时变可靠度的评估研究[D].北京:清华大学,2002.
[7]杨伟军,梁文兴,张建仁.服役桥梁评估荷载分析[J].中南公路工程,2002,27(3):31-33.
[8]索清辉,钱永久,张方.对公路桥梁剩余寿命时变荷载取值研究[J].中国工程科学,2004,6(3):52-56.
[9]梅刚,秦权,林道锦.公路桥梁车辆荷载的双峰分布概率模型[J].清华大学学报(自然科学版),2003,43(10):1394-1396.
[10]张建仁,王磊,薛雷.考虑抗力劣化的既有钢筋混凝土桥梁车辆荷载取值研究[C]//中国公路学会桥梁和结构工程分会2005年全国桥梁学术会议论文集.北京:人民交通出版社,2005:859-864.
[11]王磊,张建仁.基于平衡更新过程的既有桥梁车辆荷载效应模型[J].中国公路学报,2008,21(5):50-56.
[12]李扬海,鲍卫刚.公路桥梁结构可靠度与概率极限状态设计[M].北京:人民交通出版社,1997:11-21.
[13]李桂青,李秋胜.工程结构时变可靠度理论及其应用[M].北京:科学出版社,2001:111-115.
[14]DEY A,MAHDEVAN S.Reliability estimation with timevariant loads and resistances[J].Journal of Structural Engineering,2000,126(5):612-620.
[15]交通部专家委员会.公路桥梁通用图:装配式预应力混凝土简支T梁桥上部构造[M].北京:人民交通出版社,2008:22-47.
[16]中交公路规划设计院.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D62—2004[S].北京:人民交通出版社,2004:25-26.
[2]贡金鑫,赵国藩.考虑抗力随时间变化的结构可靠度分析[J].建筑结构学报,1998,19(5):42-51.
[3]ENRIGHT M P.Reliability-based analysis of degrading reinforced concrete bridges[C]//Proceedings of the Workshop on Structural Reliability in Bridge Engineering,Boulder,Colorado.[S.l.:s.n.],1996:257-263.
[4]MORI Y,ELLINGWOOD B.Reliability-based service-life assessment of aging concrete structures[J].Journal of Structural Engineering,1993,119(5):1600-1621.
[5]“公路桥梁车辆荷载研究”课题组.公路桥梁车辆荷载研究[J].公路,1997(3):7-12.
[6]张建仁.现有混凝土桥梁结构基于时变可靠度的评估研究[D].北京:清华大学,2002.
[7]杨伟军,梁文兴,张建仁.服役桥梁评估荷载分析[J].中南公路工程,2002,27(3):31-33.
[8]索清辉,钱永久,张方.对公路桥梁剩余寿命时变荷载取值研究[J].中国工程科学,2004,6(3):52-56.
[9]梅刚,秦权,林道锦.公路桥梁车辆荷载的双峰分布概率模型[J].清华大学学报(自然科学版),2003,43(10):1394-1396.
[10]张建仁,王磊,薛雷.考虑抗力劣化的既有钢筋混凝土桥梁车辆荷载取值研究[C]//中国公路学会桥梁和结构工程分会2005年全国桥梁学术会议论文集.北京:人民交通出版社,2005:859-864.
[11]王磊,张建仁.基于平衡更新过程的既有桥梁车辆荷载效应模型[J].中国公路学报,2008,21(5):50-56.
[12]李扬海,鲍卫刚.公路桥梁结构可靠度与概率极限状态设计[M].北京:人民交通出版社,1997:11-21.
[13]李桂青,李秋胜.工程结构时变可靠度理论及其应用[M].北京:科学出版社,2001:111-115.
[14]DEY A,MAHDEVAN S.Reliability estimation with timevariant loads and resistances[J].Journal of Structural Engineering,2000,126(5):612-620.
[15]交通部专家委员会.公路桥梁通用图:装配式预应力混凝土简支T梁桥上部构造[M].北京:人民交通出版社,2008:22-47.
[16]中交公路规划设计院.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D62—2004[S].北京:人民交通出版社,2004:25-26.