一种基于相对位移的铰缝传力性能评估方法
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摘要
在超载运输及严酷环境因素的长期作用下,装配式混凝土板梁桥的铰缝损伤诱发的铰缝开裂、渗水及桥面铺装错台等病害现象非常普遍。基于板梁桥铰缝的受力状态和变形形态的分析,提出采用铰缝处板梁间的相对位移与板梁挠度的比值来描述铰缝的损伤度的构想,建立考虑铰缝损伤的板梁桥的铰缝传力模型。结合板梁桥静载试验中多点加载及荷载偏心情况,提出以铰缝的损伤度为评价指标的板梁桥铰缝损伤及其横向传力性能的定量评估方法。实桥静载试验资料的验证结果证明,提出的铰缝损伤度评价指标及传力性能评估方法是合理的,可用于实际工程中混凝土板梁桥的受力状态评估。
Damaged hinge joint induced diseases such as cracking,seepage and pavement faulting usually appear in fabricated concrete plate-girder bridge under the long-term action of the overload transportation and harsh environmental factors.Based on the stress state and deformation analysis of plate girders and hinge joint,a conception of using the ratio of relative displacement adjacent to hinge joint and the general deflection of plate girder beam is put forward to describe the damage degree of hinge joint.Hinge joint load transfer model considering the damage of hinge joint is established for fabricated plate-girder bridge.Combined with multi-point and eccentric loading situation in conventional static loading test of highway bridges,a quantitative assessment method is put forward to evaluate the damage degree and lateral load transmission performance of hinge joint in fabricated plate-girder bridge.Several real bridge static load test data is used to validate the feasibility of the proposed model,and the results prove that the hinge joint damage evaluation index and load transmission performance evaluation method are reasonable and they can be used in technical condition evaluation of fabricated plate girder bridge in the practical engineering.
Damaged hinge joint induced diseases such as cracking,seepage and pavement faulting usually appear in fabricated concrete plate-girder bridge under the long-term action of the overload transportation and harsh environmental factors.Based on the stress state and deformation analysis of plate girders and hinge joint,a conception of using the ratio of relative displacement adjacent to hinge joint and the general deflection of plate girder beam is put forward to describe the damage degree of hinge joint.Hinge joint load transfer model considering the damage of hinge joint is established for fabricated plate-girder bridge.Combined with multi-point and eccentric loading situation in conventional static loading test of highway bridges,a quantitative assessment method is put forward to evaluate the damage degree and lateral load transmission performance of hinge joint in fabricated plate-girder bridge.Several real bridge static load test data is used to validate the feasibility of the proposed model,and the results prove that the hinge joint damage evaluation index and load transmission performance evaluation method are reasonable and they can be used in technical condition evaluation of fabricated plate girder bridge in the practical engineering.
引文
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[9]卫军,李沛,张国法,等.空心板铰缝结构耐用性能的试验研究[J].华中科技大学学报:自然科学版,2012,40(1):77-81.WEI Jun,LI Pei,ZHANG Guofa,et al.Experimental study on durability performance of hollow slab hinged joint[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2012,40(1):77-81.
[10]李国豪,石洞.公路桥梁荷载横向分布计算[M].2版.北京:人民交通出版社,1987:87-95.LI Guohao,SHI Dong.Calculation of load transverse distribution of highway bridges[M].2nd ed.Beijing:People's Transportation Press,1987:87-95.
[11]秦禄生.重载条件下小跨径简支板桥的横向铰接能力分析[J].公路,2007(10):14-16.QIN Lusheng.Transverse hinged capacity analysis of small span simple supported slab bridge under overload condition[J].Highway,2007(10):14-16.
[12]Timoshenko S.材料力学[M].北京:科学出版社,1990:210-217.Timoshenko S.Mechanics of materials[M].Beijing:Science Press,1990:210-217.
[2]黄民水,朱宏平.空心板梁桥"单板受力"病害机理及其加固处治研究[J].华中科技大学学报:自然科学版,2008,36(2):118-121.HUANG Minshui,ZHU Hongping.Study on mechanism processing and reinforcement of"single slab bearing"disease of hollow core slab beam bridge[J].Journal of Huazhong University of Science and Technology:Nature Science Edition,2008,36(2):118-121.
[3]JTG/T H21-2011,公路桥梁技术状况评定标准[S].JTG/T H21-2011,Standards for technical condition evaluation of highway bridges[S].
[4]乔学礼.空心板铰缝破坏机理及防治措施研究[D].西安:长安大学公路学院,2008:1-62.QIAO Xueli.Study on damage mechanism and prevention measures of hollow slab joints[D].Xi'an:Chang'an University.School of highway,2008:1-62.
[5]董海航.装配式板桥铰缝受力机理与耐用性能研究[D].西安:长安大学公路学院,2010:1-71.DONG Haihang.Study on force mechanism and durability of fabricated slab bridge hinge joint[D].Xi'an:Chang'an University.School of Highway,2010:1-71.
[6]杨继新.装配式空心板桥铰缝受力性能研究[D].呼和浩特:内蒙古工业大学土木工程学院,2009:1-100.YANG Jixin.Study on Mechanical Properties of fabricated hollow slab bridge hinge joints under the load[D].Hohhot:Inner Mongolia University of Technology.College of Civil Engineering,2009:1-100.
[7]邹毅松,袁波波,王银辉,等.基于瞬态动力分析的装配式板桥铰缝损伤识别[J].重庆交通大学学报:自然科学版,2011,30(1):1-3,43.ZOU Yisong,YUANG Bobo,WANG Yinhui,et al.Damage identification of hinged joints of prefabricated slab bridges based on transient dynamics analysis[J].Journal of Chongqing Jiaotong University:Natural Science,2011,30(1):1-3,43.
[8]窦勇芝,王复明,蔡迎春.基于信赖域算法的板梁桥横向连接刚度的参数识别[J].结构工程师,2006,22(6):25-29.DOU Yongzhi,WANG Fumin,CAI Yingchun.Parameter identification of transverse coupling stiffness for plate girder bridges based on trust region algorithm[J].Structural Engineers,2006,22(6):25-29.
[9]卫军,李沛,张国法,等.空心板铰缝结构耐用性能的试验研究[J].华中科技大学学报:自然科学版,2012,40(1):77-81.WEI Jun,LI Pei,ZHANG Guofa,et al.Experimental study on durability performance of hollow slab hinged joint[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2012,40(1):77-81.
[10]李国豪,石洞.公路桥梁荷载横向分布计算[M].2版.北京:人民交通出版社,1987:87-95.LI Guohao,SHI Dong.Calculation of load transverse distribution of highway bridges[M].2nd ed.Beijing:People's Transportation Press,1987:87-95.
[11]秦禄生.重载条件下小跨径简支板桥的横向铰接能力分析[J].公路,2007(10):14-16.QIN Lusheng.Transverse hinged capacity analysis of small span simple supported slab bridge under overload condition[J].Highway,2007(10):14-16.
[12]Timoshenko S.材料力学[M].北京:科学出版社,1990:210-217.Timoshenko S.Mechanics of materials[M].Beijing:Science Press,1990:210-217.