秀山大桥主桥钢箱梁施工过程计算分析
|
摘要
秀山大桥主桥为主跨926m的双塔钢箱梁地锚式悬索桥,采用三跨连续弹性支承体系。为了提高钢箱梁吊装过程的结构计算精度,采用MIDAS Civil软件建立全桥施工过程有限元模型,对成桥恒载目标、主缆与加劲梁线形、无索区体系转换及合龙过程中的计算精度影响因素进行分析。结果表明:该桥加劲梁的整体刚度和恒载分配需分阶段形成;采用主缆-索鞍的接触模拟方法计算主缆线形,能有效消除索鞍附近区域主缆线形的计算误差;根据临时连接件的实际开口边界状态模拟加劲梁的铰接状态,可得到较为准确的加劲梁线形;在体系转换及合龙阶段,根据预抬量、预偏量、合龙口位移差等指标对加劲梁的内力和线形进行精确控制,最终使成桥达到预定理想状态。
The main bridge of Xiushan Bridge is a ground-anchored suspension bridge with a main span of 926 m,consisting of double towers and steel box girders,adopting three-span continuous elastic support system.In order to improve the accuracy of structural calculation of steel box girder during hoisting process,we adopted MIDAS Civil finite elements software to establish a finite element model of the whole bridge construction process,and analyzed the factors influencing the calculation accuracy of the dead load target,the alignment of the main cable and stiffening beam,the system transformation of the cable-free zone,and the closure process.The results show that the overall stiffness and dead load distribution of the stiffening girder of the bridge need to be formed in stages.The contact simulation method of the main cable-saddle is used to calculate the main cable shape,so that the calculation error of the main cable shape near the saddle can effectively be eliminated.The articulation state of the stiffening girder can be simulated according to the actual open boundary state of the temporary connector,and the more accurate stiffening girder shape can be obtained.In the stages of system transformation and closure,the internal force and alignment of the stiffening girder are accurately controlled according to the indexes of pre-lifting,pre-deviation and closure displacement difference,so that the completed bridge can reach the desired state.
The main bridge of Xiushan Bridge is a ground-anchored suspension bridge with a main span of 926 m,consisting of double towers and steel box girders,adopting three-span continuous elastic support system.In order to improve the accuracy of structural calculation of steel box girder during hoisting process,we adopted MIDAS Civil finite elements software to establish a finite element model of the whole bridge construction process,and analyzed the factors influencing the calculation accuracy of the dead load target,the alignment of the main cable and stiffening beam,the system transformation of the cable-free zone,and the closure process.The results show that the overall stiffness and dead load distribution of the stiffening girder of the bridge need to be formed in stages.The contact simulation method of the main cable-saddle is used to calculate the main cable shape,so that the calculation error of the main cable shape near the saddle can effectively be eliminated.The articulation state of the stiffening girder can be simulated according to the actual open boundary state of the temporary connector,and the more accurate stiffening girder shape can be obtained.In the stages of system transformation and closure,the internal force and alignment of the stiffening girder are accurately controlled according to the indexes of pre-lifting,pre-deviation and closure displacement difference,so that the completed bridge can reach the desired state.
引文
[1]董萌,崔冰,王潇军.三跨连续弹性支撑体系悬索桥结构体系设计研究[J].中国工程科学,2013(8):18-25.(DONG Meng,CUI Bing,WANG Xiao-jun.Research of Three-Span Continuous Elastic Supporting Suspension Bridge Structure System Design[J].Engineering Science,2013(8):18-25.in Chinese)
[2]南京重大路桥建设指挥部.南京长江第四大桥工程技术总结[M].北京:人民交通出版社,2013.(Construction Headquarters of Major Roads and Bridges of Nanjing City.Technical Summary of Fourth Nanjing Changjiang River Bridge Project[M].Beijing:China Communications Press,2013.in Chinese)
[3]王忠彬.武汉鹦鹉洲长江大桥上部结构施工监控技术[J].桥梁建设,2018,48(1):100-105.(WANG Zhong-bin.Construction Monitoring Techniques for Superstructure of Yingwuzhou Changjiang River Bridge in Wuhan[J].Bridge Construction,2018,48(1):100-105.in Chinese)
[4]邓小康,谢肖礼,徐恭义.武汉杨泗港长江大桥成桥状态的统一悬链线计算方法[J].桥梁建设,2018,48(4):79-83.(DENG Xiao-kang,XIE Xiao-li,XU Gong-yi.Unified Catenary Calculation Method for Main Cable of Wuhan Yangsigang Changjiang River Bridge in Completion State[J].Bridge Construction,2018,48(4):79-83.in Chinese)
[5]李鸥.大跨度单主缆悬索桥体系转换过程受力分析[J].桥梁建设,2014,44(3):104-108.(LI Ou.Force Condition Analysis of a Long Span Single Main Cable Suspension Bridge in Process of System Transformation[J].Bridge Construction,2014,44(3):104-108.in Chinese)
[6]但启联,魏凯,向琪芪,等.加劲梁形式及支承体系对三塔悬索桥整体刚度影响研究[J].世界桥梁,2017,45(5):49-53.(DAN Qi-lian,WEI Kai,XIANG Qi-qi,et al.Influences of Forms and Supporting System of Stiffening Girder on Global Stiffness of Three-Tower Suspension Bridge[J].World Bridges,2017,45(5):49-53.in Chinese)
[7]钟继卫.大跨度悬索桥钢箱梁吊装精细化分析[J].桥梁建设,2010(6):9-12.(ZHONG Ji-wei.Refined Analysis of Hoisting and Installation of Steel Box Girder of Long Span Suspension Bridge[J].Bridge Construction,2010(6):9-12.in Chinese)
[8]蒋晓槟,王骑.考虑抗风的大跨悬索桥临时连接件受力分析及优化[J].桥梁建设,2013,43(1):35-41.(JIANG Xiao-bing,WANG Qi.Mechanical Analysis and Optimization of Temporary Connectors for Long Span Suspension Bridge Considering Wind Resistance[J].Bridge Construction,2013,43(1):35-41.in Chinese)
[9]齐东春,沈锐利,杨俊.两种新单元在悬索桥有限元计算中的应用[J].桥梁建设,2014,44(1):18-24.(QI Dong-chun,SHEN Rui-li,YANG Jun.Application of Two New Elements to Finite Element Calculation of Suspension Bridge[J].Bridge Construction,2014,44(1):18-24.in Chinese)
[10]柴生波,王秀兰,肖汝诚.悬索桥主缆纵桥向约束刚度研究[J].中国公路学报,2015,28(8):59-66.(CHAI Sheng-bo,WANG Xiu-lan,XIAO Ru-cheng.Study on Longitudinal Restraint Stiffness of Main Cable in Suspension Bridge[J].China Journal of Highway and Transport,2015,28(8):59-66.in Chinese)
[2]南京重大路桥建设指挥部.南京长江第四大桥工程技术总结[M].北京:人民交通出版社,2013.(Construction Headquarters of Major Roads and Bridges of Nanjing City.Technical Summary of Fourth Nanjing Changjiang River Bridge Project[M].Beijing:China Communications Press,2013.in Chinese)
[3]王忠彬.武汉鹦鹉洲长江大桥上部结构施工监控技术[J].桥梁建设,2018,48(1):100-105.(WANG Zhong-bin.Construction Monitoring Techniques for Superstructure of Yingwuzhou Changjiang River Bridge in Wuhan[J].Bridge Construction,2018,48(1):100-105.in Chinese)
[4]邓小康,谢肖礼,徐恭义.武汉杨泗港长江大桥成桥状态的统一悬链线计算方法[J].桥梁建设,2018,48(4):79-83.(DENG Xiao-kang,XIE Xiao-li,XU Gong-yi.Unified Catenary Calculation Method for Main Cable of Wuhan Yangsigang Changjiang River Bridge in Completion State[J].Bridge Construction,2018,48(4):79-83.in Chinese)
[5]李鸥.大跨度单主缆悬索桥体系转换过程受力分析[J].桥梁建设,2014,44(3):104-108.(LI Ou.Force Condition Analysis of a Long Span Single Main Cable Suspension Bridge in Process of System Transformation[J].Bridge Construction,2014,44(3):104-108.in Chinese)
[6]但启联,魏凯,向琪芪,等.加劲梁形式及支承体系对三塔悬索桥整体刚度影响研究[J].世界桥梁,2017,45(5):49-53.(DAN Qi-lian,WEI Kai,XIANG Qi-qi,et al.Influences of Forms and Supporting System of Stiffening Girder on Global Stiffness of Three-Tower Suspension Bridge[J].World Bridges,2017,45(5):49-53.in Chinese)
[7]钟继卫.大跨度悬索桥钢箱梁吊装精细化分析[J].桥梁建设,2010(6):9-12.(ZHONG Ji-wei.Refined Analysis of Hoisting and Installation of Steel Box Girder of Long Span Suspension Bridge[J].Bridge Construction,2010(6):9-12.in Chinese)
[8]蒋晓槟,王骑.考虑抗风的大跨悬索桥临时连接件受力分析及优化[J].桥梁建设,2013,43(1):35-41.(JIANG Xiao-bing,WANG Qi.Mechanical Analysis and Optimization of Temporary Connectors for Long Span Suspension Bridge Considering Wind Resistance[J].Bridge Construction,2013,43(1):35-41.in Chinese)
[9]齐东春,沈锐利,杨俊.两种新单元在悬索桥有限元计算中的应用[J].桥梁建设,2014,44(1):18-24.(QI Dong-chun,SHEN Rui-li,YANG Jun.Application of Two New Elements to Finite Element Calculation of Suspension Bridge[J].Bridge Construction,2014,44(1):18-24.in Chinese)
[10]柴生波,王秀兰,肖汝诚.悬索桥主缆纵桥向约束刚度研究[J].中国公路学报,2015,28(8):59-66.(CHAI Sheng-bo,WANG Xiu-lan,XIAO Ru-cheng.Study on Longitudinal Restraint Stiffness of Main Cable in Suspension Bridge[J].China Journal of Highway and Transport,2015,28(8):59-66.in Chinese)