旧桥承载力的分析及鉴定
|
摘要
研究目的:鉴定旧桥承载力,可以评估桥梁运营的安全性,为加固设计提供依据。本文以钢筋混凝土简支T形梁桥为例,从桥梁整体工作状况、钢筋锈蚀程度、梁体开裂程度等因素入手,通过数值分析,对旧桥的承载力进行分析和鉴定。总结出旧桥承载力鉴定的基本程序。研究结论:旧桥承载力的鉴定,应该按照全桥检查、细部检测、主梁承载力检算、全桥承载力鉴定的程序进行。即首先根据桥梁的整体工作状况及病害情况确定折减系数,然后对病害最为严重和负荷最大的两类主梁进行检算,最后根据检算结果对桥梁承载力进行鉴定。对文中所列桥梁的承载力进行鉴定可见:该桥设计荷载低,加之病害的影响,承载力不能满足荷载的要求。必须对桥梁进行提高承载力加固,以保证桥梁运营的安全。
Research purposes:By verification of the load bearing capacity of the old bridge,the operation security of bridge can be appraised and the basis can be offered to the reinforcement design of the bridge.In this paper,taking a reinforced concrete simply-supported T-beam bridge as an example,the analysis and verification are made for the loading bearing capacity of the old bridge by a numerical analysis from the aspects of the overall working situation of the bridge,the corrosion degree of the steel bar and the cracking degree of beam,and the basic procedure of verifying the load bearing capacity of old bridge is offered. Research conclusions:When verifying the load bearing capacity of old bridge,the procedures of overall inspection,detailed detection,calculation of load bearing capacity of the beam and the verification of the load bearing capacity of the bridge should be followed.It means that,firstly,the reduction coefficient is defined according to the overall working situation and the defect situation of the bridge,then the load bearing capacity of the beams with most serious defects or bearing maximum load is calculated,and finally,the load bearing capacity of the bridge is verified according to calculation result.The verification of the load bearing capacity of the bridge presented in this paper shows as the design load of this bridge is low and the bridge has some defects,the load bearing capacity of the bridge can't satisfy request.So the bridge must be reinforced to enhance its load bearing capacity for ensuring the operation security of the bridge.
Research purposes:By verification of the load bearing capacity of the old bridge,the operation security of bridge can be appraised and the basis can be offered to the reinforcement design of the bridge.In this paper,taking a reinforced concrete simply-supported T-beam bridge as an example,the analysis and verification are made for the loading bearing capacity of the old bridge by a numerical analysis from the aspects of the overall working situation of the bridge,the corrosion degree of the steel bar and the cracking degree of beam,and the basic procedure of verifying the load bearing capacity of old bridge is offered. Research conclusions:When verifying the load bearing capacity of old bridge,the procedures of overall inspection,detailed detection,calculation of load bearing capacity of the beam and the verification of the load bearing capacity of the bridge should be followed.It means that,firstly,the reduction coefficient is defined according to the overall working situation and the defect situation of the bridge,then the load bearing capacity of the beams with most serious defects or bearing maximum load is calculated,and finally,the load bearing capacity of the bridge is verified according to calculation result.The verification of the load bearing capacity of the bridge presented in this paper shows as the design load of this bridge is low and the bridge has some defects,the load bearing capacity of the bridge can't satisfy request.So the bridge must be reinforced to enhance its load bearing capacity for ensuring the operation security of the bridge.
引文
[1]王有志,张宏同,徐鸿儒,等.在用钢筋混凝土梁式桥的安全性评估[J].长安大学学报(自然科学版),2002(5):39-41.Wang Youzhi,Zhang Hongtong,Xu Hongru,etc.Safety-based Evaluation of Existing ReinforcedConcrete Girder Bridges[J].Journal of Chang'anUniversity(Natural Science Edition),2002(5):39-41.
[2]姜海波,车惠民.既有铁路混凝土梁疲劳与承载力可靠性评估[J].土木工程学报,2000(1):27-31.Jiang Haibo,Che Huimin.Assessment of Fatigue andLoad-bearing Reliability of Existing Concrete Beam ofa Railway Bridge[J].China Civil Engineering Journal,2000(1):27-31.
[3]陆新征,张炎圣,黄盛楠,等.基于非线性有限元和快速建模的桥梁承载力预测[J].兰州交通大学学报.2009(4):12-16.Lu Xinzheng,Zhang Yansheng,Huang Shengnan,etc.Prediction of Bridge Bearing Capacity Based on High-precision Nonlinear Finite Element Analysis and FastModeling Technology[J].Journal of Lanzhou JiaotongUniversity,2009(4):12-16.
[4]刘斌云,霍达.现有混凝土桥梁结构剩余寿命预测方法研究[J].市政交通水利工程设计,2008(2):78-81.Liu Binyun,Huo Da.Research on Remaining LifeEvaluation Methods for Existing Concrete Bridges[J].Municipal.Traffic Engineering Design,2008(2):78-81.
[5]孙彬,牛荻涛,王庆霖.锈蚀钢筋混凝土压弯构件非线性有限元分析[J].西安建筑科技大学学报.2005(3):326-331.Sun Bin,Niu Ditao,Wang Qinglin.Non-linear FiniteElement Analysis of Corroded RSC Compressive andFlexural Members[J].J.Xi’an Univ.of Arch.&Tech.(Natural Science Edition),2005(3):326-331.
[6]宗周红,任伟新,郑振飞.既有桥梁承载能力评估方法[J].地震工程与工程振动,2005(5):147-152.Zong Zhouhong,Ren Weixin,Zheng Zhenfei.LoadCarrying Capacity Assessment Methods of ExitingBridges[J].Earthquake Engineering and EngineeringVibration,2005(5):147-152.
[7]李福如,姜福香,刘晓南,等.在役混凝土桥梁承载力评定方法研究进展[J].工程建设,2010(6):5-9.Li Furu,Jiang Fuxiang,Liu Xiaonan,etc.Progress inResearch of Bearing Capacity Evaluation Method of inService Concrete Bridge[J].Engineering Construction,2010(6):5-9.
[8]林志春,王强.基于可靠度理论的既有桥梁承载力评估[J].桥涵工程,2007(6):62-65.Lin Zhichun,Wang Qiang.Assessment on the BridgeBearing Capacity Based on the Reliability Theory[J].Bridge and Culvert Engineering,2007(6):62-65.
[9]田杰,许克宾.高速铁路简支梁桥等跨布置的理论研究[J].铁道工程学报,2001(3):51-55.Tian Jie,Xu Kebin.Research on Simply SupportedBeams with Equal Span on High Speed Railways[J].Journal of Railway Engineering Society,2001(3):51-55.
[10]钟铭,许克宾,袁长卿.铁路混凝土简支曲线直梁空间扭转计算方法[J].铁道工程学报,1999(4):37-41.Zhong Ming,Xu Kebin,Yuan Changqing.CalculatingMethod of Torsion-Bending Analysis of SimplySupported Straight Concrete Beas on Railway Curve[J].Journal of Railway Engineering Society,1999(4):37-41.
[2]姜海波,车惠民.既有铁路混凝土梁疲劳与承载力可靠性评估[J].土木工程学报,2000(1):27-31.Jiang Haibo,Che Huimin.Assessment of Fatigue andLoad-bearing Reliability of Existing Concrete Beam ofa Railway Bridge[J].China Civil Engineering Journal,2000(1):27-31.
[3]陆新征,张炎圣,黄盛楠,等.基于非线性有限元和快速建模的桥梁承载力预测[J].兰州交通大学学报.2009(4):12-16.Lu Xinzheng,Zhang Yansheng,Huang Shengnan,etc.Prediction of Bridge Bearing Capacity Based on High-precision Nonlinear Finite Element Analysis and FastModeling Technology[J].Journal of Lanzhou JiaotongUniversity,2009(4):12-16.
[4]刘斌云,霍达.现有混凝土桥梁结构剩余寿命预测方法研究[J].市政交通水利工程设计,2008(2):78-81.Liu Binyun,Huo Da.Research on Remaining LifeEvaluation Methods for Existing Concrete Bridges[J].Municipal.Traffic Engineering Design,2008(2):78-81.
[5]孙彬,牛荻涛,王庆霖.锈蚀钢筋混凝土压弯构件非线性有限元分析[J].西安建筑科技大学学报.2005(3):326-331.Sun Bin,Niu Ditao,Wang Qinglin.Non-linear FiniteElement Analysis of Corroded RSC Compressive andFlexural Members[J].J.Xi’an Univ.of Arch.&Tech.(Natural Science Edition),2005(3):326-331.
[6]宗周红,任伟新,郑振飞.既有桥梁承载能力评估方法[J].地震工程与工程振动,2005(5):147-152.Zong Zhouhong,Ren Weixin,Zheng Zhenfei.LoadCarrying Capacity Assessment Methods of ExitingBridges[J].Earthquake Engineering and EngineeringVibration,2005(5):147-152.
[7]李福如,姜福香,刘晓南,等.在役混凝土桥梁承载力评定方法研究进展[J].工程建设,2010(6):5-9.Li Furu,Jiang Fuxiang,Liu Xiaonan,etc.Progress inResearch of Bearing Capacity Evaluation Method of inService Concrete Bridge[J].Engineering Construction,2010(6):5-9.
[8]林志春,王强.基于可靠度理论的既有桥梁承载力评估[J].桥涵工程,2007(6):62-65.Lin Zhichun,Wang Qiang.Assessment on the BridgeBearing Capacity Based on the Reliability Theory[J].Bridge and Culvert Engineering,2007(6):62-65.
[9]田杰,许克宾.高速铁路简支梁桥等跨布置的理论研究[J].铁道工程学报,2001(3):51-55.Tian Jie,Xu Kebin.Research on Simply SupportedBeams with Equal Span on High Speed Railways[J].Journal of Railway Engineering Society,2001(3):51-55.
[10]钟铭,许克宾,袁长卿.铁路混凝土简支曲线直梁空间扭转计算方法[J].铁道工程学报,1999(4):37-41.Zhong Ming,Xu Kebin,Yuan Changqing.CalculatingMethod of Torsion-Bending Analysis of SimplySupported Straight Concrete Beas on Railway Curve[J].Journal of Railway Engineering Society,1999(4):37-41.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心