大跨连续梁拱组合体系桥拱脚结合段局部应力分析  

Local Stress Analysis of Combination Segment at Arch Foot for Long Span Continuous Beam-arch Combined Bridge

作　　者：赵堃[1] 杨坤 屈志英 张耀武 Zhao Kun;Yang Kun;Qu Zhiying;Zhang Yaowu(Xi an Municipal Engineering Design&Research Institute Co.,Ltd.,710068,China;Shanxi Transportation Technology R&D Co.,Ltd.,Taiyuan 030032,China;SCEGC Installation Group Company Ltd.,Xi an 710068,China)

机构地区：[1]西安市政设计研究院有限公司,710068 [2]山西省交通科技研发有限公司,太原030032 [3]陕西建工安装集团有限公司,西安710068

出　　处：《特种结构》2024年第5期94-100,110,共8页Special Structures

摘　　要：大跨连续梁拱组合体系桥拱脚结合段的构造和受力复杂,需要对此处进行局部应力分析。结合工程实例,采用有限元法对拱脚结合段进行建模,提出了局部模型边界力的施加方法,并对其施加整体模型计算出的内力进行细部计算,分析局部应力状态。计算和分析结果表明,拱脚结合段的应力总体上满足设计规范要求,横隔板分别与顶板、底板和腹板相连接的倒角位置出现应力集中现象,建议对倒角设置平顺过渡段;在拱肋插入处的顶板和支座位置处的底板存在应力集中现象,建议对这些位置加强布置构造钢筋。Owing to complicated construction and loading at combination segment of arch foot,the local stress analysis is needed when designing the long span continuous beam-arch combination bridge.A finite element model for combination segment at arch foot was established.The method of determining boundary force of local model was put forward and the local stresses were analyzed by FEM.The calculation and analysis results showed that the stress states of combination segment at arch foot met the requirements of the design specification requirements on the whole.Stress concentration phenomena appeared at chamfer position of diaphragm plate connected with the top slab,bottom slab and web of the beam,respectively.Smooth transition sections were recommended to chamfer.Stress concentration phenomena also appeared at the top slab inserting the arch foot and the bottom slab setting the bearing,where the strengthening constructional reinforcement was suggested to layout.

关 键 词：连续梁拱组合体系 有限元法 拱脚结合段 局部应力分析 剪力滞效应 应力集中 

分 类 号：U448.38[建筑科学—桥梁与隧道工程] TU997[交通运输工程—道路与铁道工程]