双幅共用墩连续刚构桥合龙方案及顶推力计算研究  

DOUBLE-WIDTH OBLIQUE H-PIER CONTINUOUS RIGID BRIDGE CLOSURE SCHEME AND CLOSING TO P THRUST CALCULATION STUDY BEAM BRIDGE

作　　者：周善起 李超 胡尼芬 孙文强 Zhou Shan-qi;Li Chao;Hu Ni-fen;Sun Wen-qiang

机构地区：[1]中建三局集团有限公司,武汉430075

出　　处：《建筑技术开发》2025年第3期120-122,共3页Building Technology Development

摘　　要：双幅共用墩连续刚构桥在修建过程中,左右两幅悬臂浇筑顺序、合龙方案与顶推力、收缩徐变等诸多因素对桥梁线形及主墩位移均有影响,为确保成桥后主梁线形、主墩偏位、成桥内力满足设计与规范要求,对两幅桥的合龙方案和顶推力深入研究则显得尤为重要。研究结合重庆市某双层公轨共建高架桥工程实例,建立MIDAS有限元数值模型,分析了上层双幅连续刚构桥不同合龙方案对主梁线形及主墩横向位移的影响,从而得出合理的合龙方案。以此方案为基础,分析成桥10年后收缩徐变等因素影响下的主墩纵向位移,并计算顶推力大小,以期为工程实践起到理论支持。In the construction process of a double span shared pier continuous rigid frame bridge,many factors such as the pouring sequence of the left and right cantilever beams,the closure scheme and top thrust,shrinkage and creep have an impact on the bridge alignment and main pier displacement.In order to ensure that the main beam alignment,main pier deviation,and internal forces of the completed bridge meet the design and specification requirements,it is particularly important to conduct in-depth research on the closure scheme and top thrust of the two bridges.A MIDAS finite element numerical model was established based on a case study of a double decker public rail co construction elevated bridge project in Chongqing.The influence of different closure schemes on the main beam alignment and lateral displacement of the main pier of the upper double amplitude continuous rigid frame bridge was analyzed,and a reasonable closure scheme was obtained.Based on this plan,analyze the longitudinal displacement of the main pier under the influence of factors such as shrinkage and creep after 10 years of bridge completion,and calculate the magnitude of the top thrust.In order to provide theoretical support for engineering practice.

关 键 词：连续刚构桥 合龙方案 顶推力 有限元仿真 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]