Decision Method on Reasonable Design State of Self-anchored Suspension Bridge with Spatial Cables

摘要

According to the inherent requirements of self-anchored suspension bridge with spatial cablesrnsubjected to loads, the global flow to determine its reasonable design state is clarified. Proceedingrnfrom that the internal force state (especially bending moments) of the girder should be reasonable,rnthe method to calculate the vertical component force of hanger is obtained. Based on both thernfundamental analytical equations of spatial main cable shape-finding and the method to calculaternthe vertical component force of hanger, the specific procedure and approach to find the shape ofrnspatial main cable and to calculate the parameters of hanger in the reasonable design state arerndeveloped with ensuring the convergence. According to the condition that the hanger in thernreasonable design state only inclines in the cross direction, the recursive formula to calculate thernline shape change stiffness of spatial cable are deduced. Thus, the highly efficient and precisernmethod with clear route and definite conception is established, which is convenient forrnprogramming and deciding the reasonable design state of self-anchored suspension bridge withrnspatial cables. The efficiency and accuracy of the method in this paper has been well demonstratedrnby the case study on the Hangzhou Jiangdong Bridge.