低温条件下大跨径混合梁斜拉桥合龙顶推技术研究
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摘要
为研究大跨径混合梁斜拉桥中跨合龙施工技术,以主跨340 m的重庆高家花园轨道环线专用桥为工程背景,借助Midas/Civil2015有限元软件对其施工过程进行了仿真模拟,并对合龙顶推位移量和合龙顶推力的两个关键合龙参数的计算方法进行了系统研究。首先提出基于刚性支承连续梁法,对合龙前斜拉桥最大悬臂结构进行等效简化,利用结构温度作用位移公式计算出不同温差下的梁体伸缩量,进而确定出合龙顶推位移量,并将其与有限元软件计算值进行对比,吻合程度较高。又将现场监测的实测值与之对比,误差较小,验证了合龙顶推量数值计算方法的可靠性。其次,通过对影响主梁顶推各个因素进行分析,得出了顶推力计算公式,并利用影响矩阵和Matlab软件有效计算出不同合龙顶推位移量的顶推力数值,确定了两者变化关系。将现场监测的顶推力实测值与其对比,实测值呈台阶式增长关系,理论值呈线性增长关系,实测值均匀地分布在理论值两侧,一定程度上验证了顶推力数值计算方法的可行性。最后,介绍了缝接合龙法的现场施工过程,并依次从成桥后的斜拉索附加索力、主梁附加应力、主梁线形变化及主塔偏移方面对成桥状态进行了对比验证分析,成桥状态良好。
To research the central span closure technique for long span hybrid girder cable-stayed bridge, taking the Chongqing Garden Gao Rail Link Bridge with 340 m main span as an example, the closure process is simulated by using the Midas/Civil2015 FE software, and the calculation method of the 2 key closure parameters(jacking displacement and jacking force) is systematically studied.First, the continuous girder method based on rigid support is proposed, the maximum cantilever structure of the cable-stayed bridge before closure is equivalent simplified, and the stretching amounts of the girder body under different temperature differences are calculated by structure temperature acting displacement formula, and the jacking displacement for closure is determined accordingly, which is compared with the calculated value of FE software, showing the high degree of coincidence.It is also compared with the measured value of field monitoring, showing the small deviation, which verified the reliability of the numerical calculation method of the jacking displacement.Second, through the analysis of the influencing factors of girder jacking, the jacking force calculation formula is obtained.Combining the influence matrix and the Matlab software, the jacking force values under different jacking displacements are calculated effectively, and the relationship between jacking force and jacking displacement is identified.The comparative analysis shows that the measured values have a stepwise growth relationship, while the theoretical values show a linear growth relationship.The actual values are evenly distributed on both sides of the theoretical values, which verified the feasibility of the jacking force numerical calculation method to some extent.Finally, the construction process of the seaming closure method is introduced, and the completion state of the bridge is compared and verified from the additional cable force of the cable, the additional stress of the main girder, the change of the main girder geometric shape and the deviation of the main pylon, which shows the bridge is in good condition.
To research the central span closure technique for long span hybrid girder cable-stayed bridge, taking the Chongqing Garden Gao Rail Link Bridge with 340 m main span as an example, the closure process is simulated by using the Midas/Civil2015 FE software, and the calculation method of the 2 key closure parameters(jacking displacement and jacking force) is systematically studied.First, the continuous girder method based on rigid support is proposed, the maximum cantilever structure of the cable-stayed bridge before closure is equivalent simplified, and the stretching amounts of the girder body under different temperature differences are calculated by structure temperature acting displacement formula, and the jacking displacement for closure is determined accordingly, which is compared with the calculated value of FE software, showing the high degree of coincidence.It is also compared with the measured value of field monitoring, showing the small deviation, which verified the reliability of the numerical calculation method of the jacking displacement.Second, through the analysis of the influencing factors of girder jacking, the jacking force calculation formula is obtained.Combining the influence matrix and the Matlab software, the jacking force values under different jacking displacements are calculated effectively, and the relationship between jacking force and jacking displacement is identified.The comparative analysis shows that the measured values have a stepwise growth relationship, while the theoretical values show a linear growth relationship.The actual values are evenly distributed on both sides of the theoretical values, which verified the feasibility of the jacking force numerical calculation method to some extent.Finally, the construction process of the seaming closure method is introduced, and the completion state of the bridge is compared and verified from the additional cable force of the cable, the additional stress of the main girder, the change of the main girder geometric shape and the deviation of the main pylon, which shows the bridge is in good condition.
引文
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[13] 吴运宏,岳青,朱利明,等.金塘大桥主通航孔斜拉桥合龙控制措施[J].施工技术,2011,40(3):15-17.WU Yun-hong,YUE Qing,ZHU Li-ming,et al.Control Measures for Closure Construction of Jintang Primary Fairway Bridge [J].Construction Technology,2011,40(3):15-17.
[14] 贾少敏,赵雷,杨兴旺.嘉绍大桥主航道桥几何合龙控制[J].公路交通科技,2014,31(4):87-93.JIA Shao-min,ZHAO Lei,YANG Xing-wang.Geometry Closure Control of Main Channel Bridge of Jiaxing-Shaoxing Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(4):87-93.
[15] 陈鸣,罗承斌,张永涛,等.苏通大桥主桥中跨顶推辅助合龙技术[J].中外公路,2008,28(5):132-138.CHEN Ming,LUO Cheng-bin,ZHANG Yong-tao,et al.Assistant Pullback Technique for Main Span Closure of Sutong Bridge[J].Journal of China & Foreign Highway,2008,28(5):132-138.
[16] 陈荣刚.六跨连续刚构组合梁桥合龙方案研究[J].公路交通科技,2014,31(7):91-96.CHEN Rong-gang.Study on Closure Scheme of Six-span Continuous Rigid Frame Composite Girder Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(7):91-96
[17] 刘明虎,谭皓,徐国平,等.大跨径混合梁斜拉桥合龙技术研究与实践[J].桥梁建设,2011,41(4):83-87.LIU Ming-hu,TAN Hao,XU Guo-ping,et al.Research and Practice of Closure Techniques for Long Span Hybrid Girder Cable-stayed Bridge[J].Bridge Construction,2011,41(4):83-87.
[18] 肖汝诚,郭文复.结构关心截面内力,位移混合调整计算的影响矩阵法[J].计算力学学报,1992,9(1):91-99.XIAO Ru-cheng,GUO Wen-fu.Influence Matrics Method for Structural Adjustment Calculation of Internal Forces and Displacements of Concern Sections[J].Chinese Journal of Computational Mechanics,1992,9(1):91-99.
[19] 肖汝诚,项海帆.斜拉桥索力优化的影响矩阵法[J].同济大学学报:自然科学版,1998,26(3):235-240.XIAO Ru-cheng,XIANG Hai-fan.Influence Matrix Method of Cable Tension Optimization for Cablo-stayed Bridges[J].Journal of Tongji University:Natural Science Edition,1998,26(3):235-240.
[2] 易云焜,严和仲,赵鹍鹏,等.厦漳跨海大桥北汊主桥配切-顶推合龙技术[J].桥梁建设,2013,43(4):49-53.YI Yun-kun,YAN He-zhong,ZHAO Kun-peng,et al.Technique of Cutting-pushing Closure for North Main Bridge of Xiazhang Sea-crossing Bridge[J].Bridge Construction,2013,43(4):49-53.
[3] 涂国平,张喜刚,刘玉擎,等.混合梁斜拉桥[M].北京:人民交通出版社,2013:7-8.TU Guo-ping,ZHANG Xi-gang,LIU Yu-qing,et al.Hybrid Girder Cable-stayed Bridge[M].Beijing:China Communications Press,2013:7-8.
[4] 刘琳.大跨度混合梁斜拉桥施工期主梁应力控制与合龙技术研究[D].成都:西南交通大学,2013.LIU Lin.Girder Stress Control and Closure Technique in Construction Period of Long-span Hybrid Girder Cable-stayed Bridges[D].Chengdu:Southwest Jiaotong University,2013.
[5] 万华.荆岳长江公路大桥中跨基于缝接合龙法的合龙施工技术[J].中外公路,2011,31(4):104-107.WAN Hua.Closure Construction Technique for Jingyue Yangtze River Highway Bridge Based on Seaming Closure Metho [J].Journal of China & Foreign Highway,2011,31(4):104-107.
[6] 周晟.大跨径混合梁斜拉桥中跨合龙施工控制研究[D].长沙:长沙理工大学,2011.ZHOU Sheng.Research on Mid-span Closure Construction Control of Long-span Hybrid Girder Cable-stayed Bridge[D].Changsha:Changsha University of Science & Technology,2011.
[7] 杨飞,向学建,刘殿元,等.瓯江特大桥钢箱梁合龙控制研究[J].公路交通科技,2014,31(4):94-99.YANG Fei,XIANG Xue-jian,LIU Dian-yuan,et al.Steel Box Girder Closure Control Research of Oujiang Grand Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(4):94-99.
[8] 李宏江,李万恒,张劲泉,等.既有PC斜拉桥合龙段拆除的施工控制[J].公路交通科技,2008,25(8):61-66.LI Hong-jiang,LI Wan-heng,ZHANG Jin-quan,et al.Construction Control for Removal of the Closure Segment in an Existing Prestressed Concrete Cable-stayed Bridge[J].Journal of Highway and Transportation Research and Development,2008,25(8):61-66.
[9] 项海帆.高等桥梁结构理论[M].北京:人民交通出版社,2001:284-285.XIANG Hai-fan.Structural Theory of High Grade Bridges[M].Beijing:China Communications Press,2001:284-285.
[10] 崔清洋,张大华,朱华.结构力学[M].武汉:武汉理工大学出版社,2010:113-114.CUI Qing-yang,ZHANG Da-hua,ZHU Hua.Structural Mechanics[M].Wuhan:Wuhan University of Technology Press,2010:113-114.
[11] 吴明威,华勇,向梨梨,等.大跨度钢桁结合梁斜拉桥合龙施工技术[J].施工技术,2016,45(增1):294-297.WU Ming-wei,HUA Yong,XIANG Li-li,et al.Closure Construction Technology of Cable-stayed Bridge with Large Span Steel Truss Composite Girder[J].Construction Technology,2016,45(S1):294-297.
[12] 何承海,彭琳琳.嘉绍大桥合龙工艺研究[J].施工技术,2014,43(23):58-60.HE Cheng-hai,PENG Lin-lin.Study on Closure Technology of Jiashao Bridge[J].Construction Technology,2014,43(23):58-60.
[13] 吴运宏,岳青,朱利明,等.金塘大桥主通航孔斜拉桥合龙控制措施[J].施工技术,2011,40(3):15-17.WU Yun-hong,YUE Qing,ZHU Li-ming,et al.Control Measures for Closure Construction of Jintang Primary Fairway Bridge [J].Construction Technology,2011,40(3):15-17.
[14] 贾少敏,赵雷,杨兴旺.嘉绍大桥主航道桥几何合龙控制[J].公路交通科技,2014,31(4):87-93.JIA Shao-min,ZHAO Lei,YANG Xing-wang.Geometry Closure Control of Main Channel Bridge of Jiaxing-Shaoxing Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(4):87-93.
[15] 陈鸣,罗承斌,张永涛,等.苏通大桥主桥中跨顶推辅助合龙技术[J].中外公路,2008,28(5):132-138.CHEN Ming,LUO Cheng-bin,ZHANG Yong-tao,et al.Assistant Pullback Technique for Main Span Closure of Sutong Bridge[J].Journal of China & Foreign Highway,2008,28(5):132-138.
[16] 陈荣刚.六跨连续刚构组合梁桥合龙方案研究[J].公路交通科技,2014,31(7):91-96.CHEN Rong-gang.Study on Closure Scheme of Six-span Continuous Rigid Frame Composite Girder Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(7):91-96
[17] 刘明虎,谭皓,徐国平,等.大跨径混合梁斜拉桥合龙技术研究与实践[J].桥梁建设,2011,41(4):83-87.LIU Ming-hu,TAN Hao,XU Guo-ping,et al.Research and Practice of Closure Techniques for Long Span Hybrid Girder Cable-stayed Bridge[J].Bridge Construction,2011,41(4):83-87.
[18] 肖汝诚,郭文复.结构关心截面内力,位移混合调整计算的影响矩阵法[J].计算力学学报,1992,9(1):91-99.XIAO Ru-cheng,GUO Wen-fu.Influence Matrics Method for Structural Adjustment Calculation of Internal Forces and Displacements of Concern Sections[J].Chinese Journal of Computational Mechanics,1992,9(1):91-99.
[19] 肖汝诚,项海帆.斜拉桥索力优化的影响矩阵法[J].同济大学学报:自然科学版,1998,26(3):235-240.XIAO Ru-cheng,XIANG Hai-fan.Influence Matrix Method of Cable Tension Optimization for Cablo-stayed Bridges[J].Journal of Tongji University:Natural Science Edition,1998,26(3):235-240.