V形墩连续刚构桥顶升不同步对主梁的影响分析  

Analysis of Influence of Non-synchronous Jacking on Main Girder of Continuous Rigid Frame Bridge with V-shaped Piers

作　　者：王勇 WANG Yong(Huzhou Traffic Plan and Design Institute,Huzhou,Zhejiang 313000,China)

机构地区：[1]湖州交通规划设计院,浙江湖州313000

出　　处：《黑龙江交通科技》2024年第9期122-126,共5页Communications Science and Technology Heilongjiang

摘　　要：以V形墩连续刚构桥作为工程背景,分析V形墩连续刚构桥的受力特点并简要介绍了主跨桥梁概况。按规范要求对需顶升的V形墩连续刚构桥按规范进行现状评估,并作为顶升的前提条件。分析了本桥的顶升方案设计,根据顶升方案,分析V形墩连续刚构桥切割顶升过程中的体系转换,在切割完成后需对主桥顶升,考虑到顶升过程中千斤顶会存在不同步的影响,假定竖向位移偏差20 mm,对四个墩位可能出现的组合进行包络,考察主桥的受力。采用有限元分析软件建立全桥模型,并模拟顶升不同步工况。通过计算分析可知,位移差控制在20 mm以内时,不会对顶升过程中主桥结构的安全性造成显著影响,施工过程中应通过实时的监控测量尽可能地实现同步顶升。Taking V-piers continuous rigid frame bridge as engineering background,the mechanical characteristics of V-pier continuous rigid frame bridge are analyzed and the general situation of main span bridge is briefly introduced.The status of V-shaped piers continuous rigid frame bridge which needs to be jacked up is evaluated according to the code and taken as the prerequisite for jacking up.The jacking scheme design of the bridge is analyzed.According to the jacking scheme,the system conversion during the cutting jacking process of the V-shaped continuous rigid frame bridge is analyzed.After the cutting is completed,the main bridge should be jacked up.Proposed full bridge model was used to simulate the jacking asynchronous condition.Through calculation and analysis,it can be seen that when the displacement difference is controlled within 20 mm,it will not have a significant impact on the safety of the main bridge structure during the jacking process.In the construction process,synchronous jacking should be realized as far as possible through real-time monitoring and measurement.

关 键 词：V形墩连续刚构桥 桥梁顶升 不同步工况 受力分析 

分 类 号：U445[建筑科学—桥梁与隧道工程]