Fine Simulation Of Main Cable And Cable Saddle During Construction Of Suspension Bridge

As the span of the suspension bridge increases,the main cable shape control becomes more and more important during the construction of the suspension bridge.Because the suspension bridge structure has strong nonlinear characteristics,the finite element program is usually used to calculate the suspension bridge structure in actual design and construction.However,the current general finite element program generally ignores the influence of the saddle when simulating the construction process of the suspension bridge,so the calculation result has a certain error.For large-span suspension bridges,this error is not negligible,so the main cable and cable saddle should be refined in the analysis.Based on the nonlinear finite element theory and the segmented catenary theory,this paper analyzes the suspension cable saddle-rope unit and the finite element program suitable for suspension bridge analysis.The main contents are as follows:Firstly,the contact nonlinearity of the suspension cable saddle is studied and analyzed,and an iterative solution method for solving the tangent point between the cable saddle and the cable is established.The calculation method of the initial value of the iterative solution is improved,which effectively reduces the unreasonable initial value.The iteration does not converge and reduces the number of iterations required.And the cable saddle-cord unit is established,and its unit state solving method and unit tangent stiffness matrix solving method are given.The calculation and simulation method of cable saddle-rope unit in analyzing the cable saddle of suspension bridge are analyzed.Then the catenary clue unit is established according to the segmented catenary theory,and the state solving process is derived.And the beam unit and the rod unit are established according to the C.R column method.The solving theory of nonlinear finite element basic equations is analyzed in detail.The nonlinear finite element program including cable saddle-cord unit is written by iterative method,and the parameterization of the program is realized.The example proves that the program has high computational efficiency and computational accuracy and is suitable for the analysis of suspension bridges.In the end,the calculation methods of planar catenary clue unit and plane cable saddle-rope unit are extended to the space,and the space catenary clue unit is established,and the space cable saddle-rope unit is established.The correctness of the unit is verified by an example.Computational analysis shows that the cable saddle-cord unit can effectively simulate the relative relationship between the main cable of the suspension bridge and the cable saddle,and has high accuracy.The unit can be used in the actual suspension bridge construction to realize the refined simulation calculation of the suspension bridge cable system.