存梁时间对拼宽T梁桥运营期主梁线形的影响
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摘要
为研究存梁时间对拼宽桥主梁线形的影响,基于有限元法建立了三跨拼宽T梁桥有限元模型,分析了拼宽桥运营一段时间后在收缩徐变作用下的竖向、横向及纵向变形.研究结果表明:在考虑收缩徐变对拼宽桥线形的影响时,新旧桥梁的运营时间长短对主梁线形的影响较小,主要由存梁时间控制;拼接处的新旧梁位移差应予以控制,避免过大位移差引起的开裂风险;存梁时间过短对运营期的主梁线形不利,建议拼宽用新梁的存梁时间取6个月以上,最低不得少于3个月.
In order to study the influence of the beam-preserving period on the geometric shape of the main beam of the widened bridge,a finite element model of the three-span widened T-beam bridge was established based on the finite element method,and the vertical,transverse and longitudinal deformation under the action of shrinkage and creep after the operation of the wide bridge was analyzed.The results show that when considering the influence of shrinkage and creep on the shape of the wide bridge,the operation time of the new and old bridges has less influence on the main beam geometric shape,which is mainly controlled by the beam-preserving period;the displacement of the new and old beams at the joint should be controlled.To avoid the risk of cracking caused by excessive displacement difference,the small beam-preserving period is not good for the main beam geometric shape during the operation period.It is recommended to use the new beam for more than 6 months,and the minimum is not less than 3 months.
In order to study the influence of the beam-preserving period on the geometric shape of the main beam of the widened bridge,a finite element model of the three-span widened T-beam bridge was established based on the finite element method,and the vertical,transverse and longitudinal deformation under the action of shrinkage and creep after the operation of the wide bridge was analyzed.The results show that when considering the influence of shrinkage and creep on the shape of the wide bridge,the operation time of the new and old bridges has less influence on the main beam geometric shape,which is mainly controlled by the beam-preserving period;the displacement of the new and old beams at the joint should be controlled.To avoid the risk of cracking caused by excessive displacement difference,the small beam-preserving period is not good for the main beam geometric shape during the operation period.It is recommended to use the new beam for more than 6 months,and the minimum is not less than 3 months.
引文
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[2]AGCS Z,VANKO M.Preparation of the reconstruction of the old bridge over the Danube in Bratislava[J].Procedia Engineering,2016,156:8-15.
[3]PAEGLITIS A,ZVEJNIEKS V,AHMENKO G.Light weight concrete application in Latvian Bridges[C]∥Proceedings of the Fib Symposium,2004:198-199.
[4]KELLER T,ROTHE J,CASTRO J D,et al.GFRP-balsa sandwich bridge deck:concept,design,and experimental validation[J].Journal of Composites for Construction,2014,18(2):1-10.
[5]徐强.高速公路改扩建工程桥涵结构物拼接技术[M].北京:人民交通出版社,2011.XU Q.Splicing technology of bridge and culvert structure of expressway reconstruction and extension project[M].Beijing:People's Transportation Press,2011.
[6]何启龙,钱若霖,贺书磊,等.不同横向刚度劣化类型下的拼宽桥受力影响[J].沈阳大学学报(自然科学版),2018,30(2):151-156.HE Q L,QIAN R L,HE S L,et al.Impact of widening bridge under different types of lateral stiffness degradation[J].Journal of Shenyang University(Natural Science).2018,30(2):151-156.
[7]何启龙,邬晓光,贺攀,等.基于RBF-SVM的拼宽预应力混凝土T梁桥可靠度分析[J].内蒙古大学学报(自然科学版),2018,49(4):431-438.HE Q L,WU X G,HE P,et al.Study on the flexural reliability for the old t beams of widening PC bridges based on RBF-SVM[J].Journal of Inner Mongolia University(Natural Science Edition),2018,49(4):431-438.
[8]黄萍.预应力混凝土T梁变宽拼宽静力特性分析[J].公路交通科技,2010,27(3):86-92.HUANG P.Research on static behavior of broaden spliced prestressed concrete T-type beam bridges[J].Technology of Highway and Transport,2010,27(3):86-92.
[9]林天然,王晓军,柴春峰,等.收缩徐变对拼宽桥梁影响的数值分析[J].城市道桥与防洪,2017(3):121-123.LIN T R,WANG X J,CHAI C F,et al.Numerical analysis on influence of shrinkage creep on spliced and widened bridge[J].City Bridge and Flood Control,2017(3):121-123.
[10]王浩,朱若溪,张肇红.连接刚度对加宽桥梁荷载横向分布的影响分析[J].公路,2013(7):143-146.WANG H,ZHU R X,ZHANG Z H.Analysis of the influence of connection stiffness on lateral distribution of load of widened Bridge[J].Highway,2013(7):143-146.
[11]叶奂.改扩建项目中桥梁拼宽技术的探索与应用分析[C]∥中国公路学会养护与管理分会第七届学术年会论文集,2017.YE H.The research and application analysis of bridge expansion project in widening technology[C]∥The Seventh Annual Conference of China Institute of Highway Maintenance and Management,2017.
[12]廖朝华.高速公路改扩建工程关键技术研究[D].武汉:武汉理工大学,2009.LIAO Z H.Research on key technology of expressway reconstruction and extension project[D].Wuhan:Wuhan University of Technology,2009.
[13]苏佩,钱若霖,邬晓光,等.装配式简支T梁宽桥横向分布[J].沈阳大学学报(自然科学版),2017,29(3):229-232.SU P,QIAN R L,WU X G,et al.Transverse distribution of fabricated simply supported T-girder bridge[J].Journal of Shenyang University(Natural Science),2017,29(3):229-232.
[14]黄文波.公路旧桥扩宽加固及连接技术研究[D].广州:华南理工大学,2009.HUANG W B.The width reinforcement and the splicing engineering research of old bridge expands[D].Guangzhou:South China University of Technology,2009.
[15]温庆杰.混凝土桥梁拓宽设计理论与施工技术[M].徐州:中国矿业大学出版社,2015.WEN Q J.Theory and construction technology of concrete bridge widening design[M].Xuzhou:China University of Mining and Technology Press,2015.
[16]国家铁路局.铁路桥涵设计规范:TB 10002-2017,J460-2017[S].北京:中国铁道出版社,2017.National Railway Administration of the People's Republic of China.Code for design on railway bridge and culvert[S].Beijing:China Railway Publishing House,2017.