大跨度连续刚构桥合龙方案及力学行为研究  

Research on Long-Span Continuous Rigid Frame Bridge Closure Scheme and Mechanical Behavior

作　　者：张宝恒 ZHANG Baoheng(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2023年第6期150-152,170,共4页Railway Construction Technology

基　　金：中铁第五勘察设计院集团有限公司科技研发计划项目(T5Y2020-B01)。

摘　　要：本文以重庆合安高速公路涪江(100+190+100)m连续刚构桥为研究背景,拟定两种不同合龙方案,建立有限元模型进行合龙顶推分析,并对两种不同合龙方式下桥梁内力及位移进行对比,以确定合理成桥状态为目标,进行大跨度连续刚构桥合龙方案及力学行为研究。结果表明:采用中跨顶推方法对于不同合龙方案均能显著改善主墩受力,一定程度改善主梁受力;先中跨合龙相较于先边跨合龙主梁弯矩偏小;先边跨合龙后中跨合龙方式能更大程度改善主墩受力状态。In this paper,the(100+190+100)m continuous rigid frame bridge of Fujiang Bridge in Chongqing He'an Expressway is taken as the research background.By drawing up two different closure schemes,the finite element model is established to carry out the closure jacking analysis,and the internal force and displacement of the two different closure methods are compared.In order to determine the reasonable bridge state,the closure scheme and mechanical behavior of long-span continuous rigid frame bridge are studied.The research shows that the method of middle span jacking can significantly improve the stress of main pier and improve the stress of main beam to a certain extent for different closure schemes.The bending moment of the main beam of the middle span closure is smaller than that of the side span closure.The method of closing the side span before the middle span can greatly improve the stress state of the main pier.

关 键 词：连续刚构桥 合龙 顶推方案 力学行为 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U441.2[交通运输工程—道路与铁道工程]