预应力混凝土连续梁桥转体施工中的稳定性分析与控制  

Stability Analysis and Control in the Rotating Construction of Prestressed Concrete Continuous Girder Bridge

作　　者：付琳 FU Lin(China Railway 14th Bureau Group Corporation Limited,Jinan Shandong 250014,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250014

出　　处：《北方建筑》2024年第6期67-73,共7页Northern Architecture

摘　　要：本文针对跨越207省道及既有陇海铁路的转体连续梁展开了系统的研究。通过数值模拟与试验相结合的方法,探讨其在加速和匀速转动过程中结构的稳定性和应力分布特性。分析了不同转动速度与加速度对主梁受力状态的影响,得出了材料在承载力达到临界值后的变形行为。强调了施工过程中控制荷载施加的必要性,防止因超出抗拉强度而导致的结构损坏。结果表明:随着荷载的增加,主梁的变形由弹性逐渐转向非线性,应力集中现象可能会对结构造成局部损伤。因此,在工程实践中需采取监测手段,实时追踪变形情况,以制定有效的控制策略。本研究为转体连续梁的安全施工和设计提供了坚实的理论基础和实用的数据支持。A systematic study is carried out on the rotating continuous girder spanning 207 provincial highways and the existing Longhai Railway.The stability and stress distribution characteristics of the structure is investigated in the process of acceleration and uniform rotation through the combination of numerical simulation and test.The effects of different rotation speeds and accelerations on the force state of the main girder are analyzed,and the deformation behavior of the material after the bearing capacity reaches the critical value is derived.Emphasizing the necessity of controlling the load application during the construction process to prevent the structural damage due to exceeding the tensile strength.It is revealed that the deformation of the main girder gradually shifts from elasticity to nonlinearity as the load increases,and the stress concentration phenomenon may cause localized damage to the structure.Therefore,monitoring means are required to track the deformation in real time in order to formulate an effective control strategy in engineering practice.This study provides a solid theoretical foundation and practical data support for the safe construction and design of rotating continuous girders.

关 键 词：预应力混凝土 连续梁桥 球铰转动法 稳定性分析 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]