Study On Theoretical Analysis And Numerical Simulation Of Cable Structures

Ye Sanhe large-scale suspended-pipe bridge is a super-flexible suspension structuresystem. Compared with the other bridge structures, the suspended-pipe bridge hadcharacteristics of smaller width-span ratio, high-span ratio, larger flexibility, lower dampingand larger stiffness of overall structure, and it was strong non-linearity.The calculation theory of the suspension bridge has developed from the classicalelasticity theory and deflection theory to the finite displacement theory widely used now. Thispaper analyzes the influencing factors about geometric non-linearity of the suspended-pipebridge, introduces two kinds of non-linear analysis methods (the total Lagrange fomulamethod and the updated Lagrange formula method), and studies and sums up its calculationmethod.Compared with the other bridge structures, the safety of the suspended-pipe bridge ismore easily impacted. The suspension bridge is particularly sensitive about low frequencyvibration loads, because of the large flexibility, small stiffness and low damping, so it's evenmore important for dynamic analysis. This paper summarizes the dynamic calculation methodsof suspension bridges under the earthquake loads and fluctuating wind loads.About the safety performance of the Ye Sanhe suspended-pipe bridge, this paper carriedout a full-bridge simulation analysis using ANSYS. It has launched the following work:(1) After analyzing the working principle of the suspension bridge, this paper creates thefinite element model of the suspended-pipe bridge and carries on the geometric nonlinearityanalysis.(2) The dynamic analysis of suspended-pipe bridge includes the modal analysis, theseismic response analysis and the wind-induced response analysis. With regard to seismicresponse analysis, this paper directly inputs the existing seismic data files for dynamic timehistoryanalysis. Because of the characters of the fluctuating wind, the dynamic time-history method is also used to carry on the wind-induced response analysis.(3) Carrying on the analysis of the safety of the suspended-pipe bridge bases on theresults of ANSYS calculations.