跨既有铁路的墩中转体连续刚构桥静风响应分析  

Analysis of the Static Wind Response of Continuous Rigid Frame Bridge with Pier Swivel Construction Crossing Existing Railway

作　　者：王祥 WANG Xiang(Sichuan Road&Bridge(Group)Corporation Bridge Engineering Co.,Ltd.,Chengdu,Sichuan 610017,China)

机构地区：[1]四川路桥桥梁工程有限责任公司,四川成都610071

出　　处：《黑龙江交通科技》2024年第9期90-96,共7页Communications Science and Technology Heilongjiang

摘　　要：随着我国交通路网的建设、完善和铺展,新旧线路的开通和更替,当新建桥梁遇到已有的交通线路时,转体施工法可满足相互兼容的要求。然而,跨既有线路桥梁的大跨度、高墩、大吨位等特点使得其对风的作用也越来越敏感。针对转体梁桥在风荷载作用下的抗风稳定性问题进行分析,以大树村龙川江三线大桥为研究对象,利用有限元和计算流体力学等数值模拟手段,建立其转体上部结构有限元模型并计算转体梁段静力三分力系数,通过模拟其在复杂静风荷载和动力风荷载作用下的响应特性,明确最不利静风荷载布载方式;根据转体前后两个状态的前10阶模态特性,确定转体梁段的最不利受力施工阶段,研究成果可为转体梁桥提供抗风设计的科学依据与技术支撑。With the expansion of domestic infrastructure and transportation networks,swivel construction ensures compatibility between new bridges and existing lines.Yet,long-span bridges crossing existing routes,characterized by high piers and heavy loads,are vulnerable to wind effects.focusing on a rigid frame bridge.Taking the Dashucun Longchuan River Third-line Bridge as the research subject,employing numerical simulations including finite element analysis and computational fluid dynamics,we model the swivel superstructure and calculate aerodynamic coefficients.Through simulations under static and dynamic wind loads,the most unfavorable load conditions are identified.Modal analysis of pre and post-swivel states pinpoints critical construction stages.The study offers a scientific foundation and technical guidance for wind-resistant design of swivel girder bridges.

关 键 词：桥梁转体施工 静风响应 跨既有铁路 连续刚构桥 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]