大跨度钢结构连续刚构桥施工和成桥阶段抖振分析  

Buffeting analysis of long-span continuous rigid frame steel bridge during construction and completion

作　　者：李继为 LI Jiwei(Xiong'an New Area Construction Engineering Quality and Safety inspection Service Center,Xiong'an 071700,Hebei,China)

机构地区：[1]雄安新区建设工程质量安全检测服务中心,河北雄安071700

出　　处：《金属功能材料》2023年第4期94-99,共6页Metallic Functional Materials

摘　　要：以某跨越高山峡谷的大跨度高墩连续刚构桥为研究对象,基于抖振时程分析和桥梁抗风设计理论,利用有限元软件ANSYS,对该钢构桥在施工阶段和成桥阶段的抖振现象进行了研究。研究结果表明:在施工和成桥阶段,自然风引起的主梁节点位移会发生显著变化。脉动风对结构响应的影响相对显著,在设计环节需给予充分考虑。分析桥梁结构横向位移可知,脉动放大较为明显,扭转位移和竖向位移相对小,较扭转位移和竖向位移相对小;桥墩底部弯矩脉动放大作用在横向、竖向和扭转位移上差距较小,这些均与脉动风具有密切相关性。简单讨论了钢材应对桥梁风振的特点。Takes a long-span high-pier continuous rigid frame bridge that spans a mountain and valley as the research object,based on buffeting time-history analysis and bridge wind resistance design theory,using calculation software ANSYS,the steel frame bridge is successfully constructed during the construction phase.The buffeting phenomenon at the bridge stage was studied.The research results show that during the construction and completion stages,the displacement of the main beam node caused by natural wind will change significantly.The effect of fluctuating wind on the structural response is relatively significant,which should be fully considered in the design process.From the analysis of the transverse displacement of the bridge structure,it can be seen that the pulsation amplification is obvious,the torsional displacement and vertical displacement are relatively small,and the torsional displacement and vertical displacement are relatively small.The amplification of the moment fluctuation at the bottom of the pier has a small difference in the horizontal,vertical and torsional displacement,which are closely related to the fluctuating wind.The characteristics of steel responding to wind-induced vibration of bridge are discussed.

关 键 词：连续刚构桥 高墩 风荷载 动力响应 抖振 

分 类 号：U445.4[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]