LYQJ40 t-18 m架桥机抗风稳定性能研究

Study on wind-resistance stability of LYQJ40 t-18 m bridge erection machine

为探究海域风荷载对架桥机抗风稳定性的影响,以采用LYQJ40 t-18 m架桥机安装预制纵横梁的某海域项目为依托,采用谐波合成法模拟风速时程,利用MATLAB软件基于Kaimal谱生成脉动风场,再利用有限元软件对架桥机在最大悬臂工况下的静风荷载、脉动风荷载响应进行了计算,分析架桥机的主梁抗倾覆稳定性。计算结果表明:在静风荷载、脉动横向及竖向风荷载作用下,架桥机主梁的最大应力分别为-132.5、-166.9、-171.2 MPa,均小于许用应力(176 MPa),架桥机支点的反力均为正值,没有支座脱空风险,且抗倾覆系数K>1.5,架桥机不会发生倾覆失稳现象。因此,架桥机在海域风荷载作用下具有良好的抗风稳定性,可保障施工安全。

In order to explore the influence of sea area wind load on the wind-resistance stability of bridge erection machine,LYQJ40 t-18 m bridge erection machine is used to install precast longitudinal and transverse beams for a project near a sea area,and the weighted amplitude wave superposition method was used to simulate the wind speed time history and MATLAB software generates fluctuating wind field based on Kaimal spectrum.Then,the finite element software was used to simulate the maximum cantilever working condition and calculate the response of bridge erection machine under static and fluctuating wind loads.The anti-overturning stability of the main girder of the bridge erection machine was analyzed.The calculation results show that under static wind load,fluctuating transverse wind load and vertical wind load,the maximum stresses of the girder of the bridge erection machine were respectively-132.5,-166.9 and-171.2 MPa,which are less than the allowable stress of 176 MPa.The counter forces of the supporting points of the bridge erection machine were all positive values.There is no risk of bearing separation and the anti-overturning coefficient is K>1.5.The bridge erection machine could not overturn and lose stability.The above research shows that the bridge erection machine has good wind-resistance stability under the action of sea area wind load,which could ensure the construction safety.