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