钢筋混凝土系杆拱桥施工阶段稳定性研究  

Study on the Stability of Reinforced Concrete Tied Arch Bridge in Construction Stage

作　　者：王青蕊 WANG Qingrui(China Railway 17^th Bureau Group Co.Ltd.,Taiyuan Shanxi 030006,China)

机构地区：[1]中铁十七局集团有限公司,山西太原030006

出　　处：《铁道建筑技术》2020年第11期92-96,共5页Railway Construction Technology

基　　金：中铁十七局集团有限公司科技研发计划项目(2017-18)。

摘　　要：系杆拱桥既能发挥梁桥的抗弯性能,又能发挥拱桥较好的抗压性能,但钢筋混凝土系杆拱桥在各施工阶段所受的荷载和外部约束条件都不尽相同,所以其各构件的受力变形特性较难统一界定。本文以关凤大桥为研究对象,建立有限元模型,研究了其整个施工阶段位移和应力情况。结果表明:系梁和拱肋都是始终受压,系梁的最大压应力出现在截面突变处,拱肋的最大压应力出现在1/8截面处,二者的最大挠度值都出现在1/2位置处;吊杆的最大应力远小于材料的容许应力,结构设计偏安全。Tied arch bridge can not only give full play to the bending performance of beam bridge,but also give full play to the better compression performance of arch bridge.However,the load and external constraint conditions of reinforced concrete tied arch bridge in each construction stage are not the same,so it is difficult to define the mechanical and deformation characteristics of its components.This paper takes Guanfeng Bridge as the research object,establishes the finite element model,and studies the displacement and stress of the whole construction stage.The results show that both the tie beam and the arch rib are always under pressure,the maximum compressive stress of the tie beam appears at the abrupt change of the section,the maximum compressive stress of the arch rib appears at the 1/8 section,and the maximum deflection of both appears at the 1/2 position;the maximum stress of the suspender is far less than the allowable stress of the material,so the structure design is more safe.

关 键 词：系杆拱桥 施工阶段 受力特性 挠度 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]