Simulation Research on Mechanical Properties of Temporary Swivel Pier System of Long-span Bridge
In order to reduce the influence of long-span bridge construction on the operation of highway and railway lines,shorten the construction period and save the cost,a temporary pier external rotation method is proposed.The finite element analysis model of the swivel spherical hinge is established by Midas Fea software,and the local stress of the swivel system under the uniform rotation stage,the accelerated rotation stage and the unbalanced load is analyzed.In the uniform rotation stage,the maximum stress of the upper and lower spherical hinges is 39.79 MPa and 49.34 MPa respectively,which meets the strength requirements.In the accelerated rotation stage,when the angular acceleration exceeds 0.711 rad/s2,the maximum stress of the spherical hinge exceeds the design value.When the angular acceleration exceeds 0.716 rad/s2,the maximum shear stress of the spherical hinge exceeds the design value.Under the action of unbalanced load,the strength of the swivel spherical hinge meets the design requirements,and the maximum height difference of each point at the edge of the spherical hinge is less than the processing limit.The external rotation method of temporary pier can realize the rotation under the maximum eccentricity.After the construction is completed,the spherical hinge still meets the quality standard and can be recycled.
temporary swivel pierswivel systemexternal prestressingfinite element analysisspherical hinge for rotation
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