基于无应力状态量的桥梁成桥内力与成桥线形关系研究  

Study on Internal Stress and Shape Control of Bridge During Final Construction Stage Based on Stress-Free State Theory

作　　者：秦竟熙 苑仁安 但启联[4] QIN Jingxi;YUAN Renan;DAN Qilian(Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China;State Key Laboratory of Bridge Intelligent and Green Construction,Wuhan 430034,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China;School of Civil Engineering,Sichuan University of Science&Engineering,Zigong 643000,China)

机构地区：[1]香港理工大学土木与环境工程系,中国香港999077 [2]桥梁智能与绿色建造全国重点实验室,湖北武汉430034 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430056 [4]四川轻化工大学土木工程学院,四川自贡643000

出　　处：《桥梁建设》2025年第2期94-99,共6页Bridge Construction

基　　金：国家重点研发计划项目(2022YFB2602903);中国中铁股份有限公司科技研究开发计划项目(2021-专项-01,2022-专项-01)。

摘　　要：为解决分阶段施工桥梁成桥恒载状态的内力(简称成桥内力)与成桥恒载状态的线形(简称成桥线形)的分析与控制,基于无应力状态法理论建立杆系结构的力学平衡方程和线形控制方程,探究分阶段成形桥梁结构成桥内力与成桥线形的关系,提出成桥内力与成桥线形独立性原理。以斜拉桥结构为例,验证成桥内力与成桥线形的独立性,提出恒载状态成桥内力与成桥线形独立性控制方法,并对相关的工程应用场景进行说明。结果表明:分阶段成形的桥梁结构,通过主动控制构件单元的无应力状态量,可实现相互独立的结构内力和结构线形;在恒载确定的前提下,通过调整控制单元无应力状态量,可实现相同内力、不同线形的成桥状态和相同线形、不同内力的成桥状态;基于成桥内力与成桥线形独立控制方法可为恒载横向不对称斜拉桥设计、钢桁梁结构内力优化和桥梁施工状态偏差调整等提供新的思路。This study investigates the relationship between the internal stress and the shape control of bridges under permanent loads during the final construction stage.By employing the shape control equations of planar beam elements based on the stress-free state theory,the principle of independence between the bridge shape and the internal stress is proposed.Using a cable-stayed bridge as an example,this study examines the independent relationship between the internal stress and the bridge shape,proposes a controlling method for the internal stress and shape of the bridge during the final construction stage,and introduces potential engineering application scenarios.It is concluded that,in the staged construction of bridges with determined permanent loads,independent control of internal stress and bridge shape can be achieved by actively managing the stress-free state variables of component elements.This principle of independence between internal stress and bridge shape under permanent loads offers new insights for designing cable-stayed bridges with transversely asymmetrical permanent loads,the optimization of internal stress in steel truss bridges,and adjusting construction deviations in bridge projects.

关 键 词：桥梁工程 成桥状态 成桥内力 成桥线形 线形控制方程 相互独立 无应力状态量 理论分析 

分 类 号：U441[建筑科学—桥梁与隧道工程] U445[交通运输工程—道路与铁道工程]