高铁大跨矮塔斜拉桥施工控制研究及应用  

Study and Application of the Construction Control for Long-span Low-pylon Cable-stayed Bridge of High Speed Railway

作　　者：谢明志[1] 魏昌辛 杨永清[1] 李晓斌[1] 张克跃[1] 张涛 XIE Ming-zhi;WEI Chang-xin;YANG Yong-qing;LI Xiao-bin;ZHANG Ke-yue;ZHANG Tao(Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Siehuan 610031,China;Third Engineering Co.Ltd,Chinese Railway Construction Bridge Engineering Bureau Group,Shenyang,Liaoning 110043,China)

机构地区：[1]西南交通大学,成都610031 [2]中铁二院工程集团有限责任公司,成都610031 [3]中国铁建大桥工程局集团第三工程有限公司,沈阳110043

出　　处：《铁道工程学报》2018年第9期35-41,48,共8页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51508474);中央高校基本科研业务费专项资金项目(2682013BR015EM);教育部"春晖计划项目"(Z2014034)

摘　　要：研究目的:为确保高铁大跨矮塔斜拉桥高效、高精度的施工控制,使结构安全可控,且成桥内力、线形及索力满足设计要求,本文以新建怀邵衡铁路沅江特大桥(90+180+90)m矮塔斜拉桥为工程背景,根据理论计算、结构力学特点及工程面临的问题和挑战,建立适用于该复杂体系的施工控制体系,重点开展参数敏感性分析以探明力学行为特点,并建立线形控制、索力控制、应力控制计算及数据分析处理方法。研究结论:(1)主梁变形及应力受梁体自重、预应力和斜拉索索力影响最大,混凝土收缩徐变和索梁塔温差均为影响成桥索力及塔偏的敏感因素;(2)与常规大跨斜拉桥相比,二者力学行为差异大;(3)理论及实践表明,采用的控制系统、计算分析处理方法确保了主梁线形平顺、应力安全可控、索力均匀,均符合规范及设计要求;(4)本研究成果可应用于类似复杂结构的施工控制。Research purposes： In order to ensure the high efficiency and high-precision construction control for super long-span low-pylon cable-stayed bridge of high speed railway,make the structure safe and controllable,and the internal force,line shape and cable force of the completed bridge meet the design requirements,the（90 ＋ 180 ＋ 90） m low-pylon cable-stayed bridge of Yuanjiang extra large bridge on Huaihua-Shaoyang-Hengyang Railway was taken as a case-study,the construction control system suitable for the complex system was established according to theoretical calculation,structural mechanical behaviors and engineering problems and challenges. In this paper, parameter sensitivity analysis was carried out especially to demonstrate the characteristics of structural mechanics behavior.Besides,the methods of linear control, cable force control, stress control calculation, and data analysis were established.Research conclusions：（1） The weight of the main girder,prestressing force and cable force have a great influence on the deformation and stress of the main girder. The concrete shrinkage and creep and the temperature difference among the cable,beam and tower both are the sensitive factors that affect the cable force of the completed bridge and thedeflection of the tower.（2） The mechanical behaviors of long-span low pylon cable-stayed bridge of high speed railway are different from those of conventional long-span cable-stayed bridges.（3） Theoretical research and practice show that the calculation method and the control system adopted can ensure the geometric linear smoothness,girder stress safety and controllable,and the cable force uniformity that the monitoring indices can well meet the requirements of the specifications and design.（4） The research results can be applied to the construction control of similar complex structures.

关 键 词：桥梁工程 大跨矮塔斜拉桥 高速铁路 施工监控 参数敏感性 

分 类 号：U24[交通运输工程—道路与铁道工程] U448.27[建筑科学—桥梁与隧道工程]