台风区双孔连做造桥机风振效应研究

Research on Wind Vibration Effect of Diplopore Connecting Bridging Machine in Typhoon Area

本文对双孔连做造桥机结构风振响应进行研究,为造桥机设计提供理论依据。以平潭海峡公铁两用大桥双孔连做造桥机为研究对象,采用MIDAS CIVIL软件建立造桥机有限元模型,通过加载脉动风速时程荷载分析4923 m/s、43.8 m/s风速在0°与90°风攻角条件下造桥机停机状态与过孔状态结构的振动响应。研究结果表明:停机状态下,横风振动频率大于顺风振动频率,横风振动引起的杆件内力峰值较大;过孔状态下,横风振动频率小于顺风振动频率,横风振动引起的杆件内力峰值亦较大。过孔状态横风振动,结构杆件主要以横向位移为主,竖向位移较小;顺风振动结构杆件主要以竖向位移为主,未发生整体偏移、扭转等现象。造桥机各构件均未出现破坏与共振现象,满足台风作用下结构安全要求。

To study the wind vibration effect and provide theoretical basis for structural design of diplopore connecting bridging machine,this article took diplopore connecting bridging machine as the research object of the Pingtan Strait road-rail dual-use bridge,the overall finite element model of the bridging machine was established by MIDAS CIVIL.The vibration effect of the structure in the stopped state and the passing hole state of the bridging machine under the action of the wind speed of 49.23 m/s and 43.8 m/s at the wind attack angle of 0°and 90°was analyzed by loading the fluctuating wind speed time history load.The result shows that when the bridging machine is in the stopped state,the crosswind vibration frequency is greater than the downwind vibration frequency,and the peak internal force of the rod caused by the crosswind vibration is larger;when the bridging machine is in the passing hole state,the crosswind vibration frequency is less than the downwind vibration,and the peak internal force of the rod caused by the crosswind vibration is larger.When the bridging machine is in the passing hole state,the crosswind vibration occurs,the structural members mainly appear laterally displaced,and the vertical displacement is small;when the downwind vibration occurs,the structural members mainly appear vertical displacement,and there is no overall structural deviation,torsion,etc.The body and components of the bridging machine have no damage and resonance,which meets the structural safety requirements under the action of typhoon.