Analytical Calculation Method for Critical Load of Lateral Stability of Ring Bridge Towers
This article takes the circular bridge tower of a self-anchored suspension bridge as the research object,and based on the basic equation of spatial bending and torsion deformation of curved components,obtains the bending and torsion deformation energy of the circular tower during lateral tilting and the external force potential energy generated by the load.Using the energy method,the analytical solution of the critical load for lateral instability of the circular bridge tower is derived and a calculation method for the critical load is proposed.The theoretical calculation values are compared with the finite element calculation results through examples,which verifies the correctness of the proposed calculation method.This article also analyzes the influence of changes in parameters such as radius,center angle,and section stiffness of the circular bridge tower on its lateral stability.The research results show that the lateral bending resistance significantly contributes to the lateral stability of the circular bridge tower,thus the selection of radius and center angle of the circular bridge tower should be given attention for their influence on lateral stability.
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