偏载对多点支承转体系统受力及稳定性分析  

Analysis on the Influence of Eccentric Load on Force and Stability of Multi-Point Supported Swivel System

作　　者：张杰 ZHANG Jie(China Railway 11^(th)Bureau Group 1^(st)Engineering Co.Ltd.,Xiangyang Hubei 441104,China)

机构地区：[1]中铁十一局集团第一工程有限公司,湖北襄阳441104

出　　处：《铁道建筑技术》2023年第2期152-155,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(20-B02)。

摘　　要：为研究偏载对多点支承转体系统受力和稳定性的影响,本文开展现场转体模型试验,研究偏载对承力支腿应力、球铰应力、转动牵引力、桥梁位移的影响,探讨偏载作用下关键参数变化规律。结果表明:偏载对承力支腿和球铰应力有较大影响,随着偏载值增大,各承力支腿和球铰应力数值及波动程度增加,转体系统稳定性降低;在偏载作用下,转体系统受轨道不平顺、转动加速效应等因素的影响被放大,桥梁转动所需牵引力、主梁竖向位移和扭转角均显著增大;实桥转体建议严格控制风荷载、主梁两侧不对称悬臂长度、桥面施工机具等偏心荷载。In order to study the influence of eccentric load on the mechanical performance and stability of multi-point supported swivel system, a field swivel model test is carried out in this paper. The influence of eccentric load on bearing leg stress, spherical hinge stress, swivel traction force and bridge displacement is studied, and the variation law of the key parameters under eccentric load is discussed. The results show that the eccentric load has a great influence on the bearing leg and spherical hinge stress. With the increase of the eccentric load, the value and fluctuation degree of each bearing leg and spherical hinge stress increase, and the stability of the swivel system decreases. Under the action of eccentric load, the influence of the swivel system is amplified by the factors such as track irregularity and swivel acceleration effect, and the traction force required for the swivel bridge, the vertical displacement of the main beam and the torsion angle are significantly increased. It is suggested to strictly control the eccentric load, such as wind load, the asymmetric cantilever length on both sides of the main beam, and bridge construction equipment during the construction of swivel bridge.

关 键 词：多点支承转体系统 偏载 转体系统稳定性 现场试验 

分 类 号：U446.1[建筑科学—桥梁与隧道工程] U445.465[交通运输工程—道路与铁道工程]