钢混组合结构在危桥改造工程中的适应性  

Adaptability of Steel-concrete Composite Girders in Unsafe Bridge Reconstruction Projects

作　　者：卢晓琪 顾无敌 苗建宝 赵庭 Lu Xiaoqi;Gu Wudi;Miao Jianbao;Zhao Ting(Baoji City Highway Administration Bureau,Baoji 721004,China;Qinhuangdao Transportation Public Service Center,Qinhuangdao 066000,China;Xi’an Highway Research Institute,Xi’an 710065,China)

机构地区：[1]宝鸡市公路局,陕西宝鸡721004 [2]秦皇岛市交通运输公共服务中心,河北秦皇岛066000 [3]西安公路研究院有限公司,西安710065

出　　处：《黑龙江科学》2024年第22期74-77,共4页Heilongjiang Science

基　　金：陕西省交通科研项目(20-04K)。

摘　　要：为研究钢混组合结构在桥梁改造工程中的适用性,依托某干线公路上的一座危旧桥梁改造工程,结合桥梁病害情况,提出3种改造方案。方案一为更换主梁为钢板混凝土组合梁,方案二为更换主梁为同类型的预应力简支箱梁,方案三为对原结构进行体外预应力+局部增大截面的组合加固。通过对比适应性、施工要求、经济等因素,推荐采用更换主梁为钢板混凝土组合梁的方案,对结构进行验算分析,计算结果表明,改造后桥梁的承载极限状态及正常使用状态均满足要求,达到了桥梁改造的目的,为同类桥梁改造提供借鉴。In order to study the adaptability of steel-concrete composite girders in bridge reconstruction projects,the study proposes three reconstruction schemes based on a reconstruction project of an old and unsafe bridge on a trunk road,combines with the disease situation of the bridge,and proposes 3 modification scheme.Scheme One involves replacing the main beams with steel-concrete composite girders,Scheme Two involves replacing the main beams with similar type of prestressed simply supported box girders,and Scheme Three involved externally prestressing the original beams combined with locally increasing the section for reinforcement.Through comparing factors,such as adaptability,construction requirements and economy,it is recommended to replace the main beams with steel-concrete composite girders.Structural calculation and analysis are conducted.The calculation results show that the bearing limit state and normal use state of the reconstructed bridge meet the requirements,the purpose of bridge reconstruction is achieved,and reference for similar bridge reconstruction is provided.

关 键 词：桥梁工程 加固改造 换梁 钢板混凝土组合梁 体外预应力 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]