| As one of the main structures of oil and gas transportation,the pipeline suspension bridge has beautiful appearance,strong spanning ability and good economic indicators.Compared with general suspension bridges,pipeline suspension bridges have lower lateral stiffness and poor wind-induced stability,and wind-resistant cable structures need to be applied to pipeline suspension bridges.The shape of the main cable of the anti-wind cable is different from that of a general suspension bridge.It belongs to a spatial curve,and the force analysis is more complicated and the calculation is very complicated.At present,the segmented catenary theory is mostly used to solve the spatial alignment,which has good accuracy.In our country,the pipeline suspension bridge started late,and the research on wind-resistant cables and stable cables is scarce,so further research is needed.This paper takes the Nanchuan-Fulin Wujiang Pipeline Suspension Bridge as the engineering background.The main research contents and research results are as follows:(1)The calculation theory of the segmented catenary is elaborated,the space catenary force model is established,the wind cable shape coordinates and the unstressed length solution formula are derived from the formula,and the corresponding iterative calculation program is compiled by Matlab.Taking the Nanchuan-Fuling Wujiang Pipeline Suspension Bridge as an engineering example,the calculation results of Matlab program are imported into Midas Civil to establish a finite element model of the bridge state,and the equilibrium state is accurately solved through the suspension bridge analysis module,and the correctness of the method is verified by comparison with the design parameters.(2)By changing the angle of the wind cable,the ratio of rise to span,the initial tension,the cross-sectional area of the wind cable,the cross-sectional area of the wind cable,etc.,the influence on the dynamic characteristics of the structure is analyzed.Among them,the inclination angle and area of the wind cable have the greatest influence on the structure.Analyzed the influence of wind cable parameters on the dynamic characteristics of the bridge during the operation stage,and gave the recommended value ranges for each parameter in the wind cable design,and used the structural optimization theory to optimize the wind cable design of the Nanchuan-Fuling Wujiang Pipeline Suspension Bridge,To provide a reference for the design of the same type of suspension bridge wind cable in the future.(3)Based on the Nanchuan-Fuling Wujiang Pipeline Suspension Bridge,a finite element model with stabilizing cables was established,and the sensitivity of the vertical,lateral and torsional stiffness of the structure to the setting parameters of the stabilizing cables was analyzed,and the spacing,area,tension,and inclination angle of the stabilizing cables were obtained.The value range of the better parameters of,in which the distance between the stabilizer cables and the angle of inclination have the greatest impact on the structure.Comparing the bridge completion and operation stages,through comparative analysis of the structural dynamic characteristics of the three models without stabilizing cables,stabilizing cables and stabilizing cables with inclined angles,it is obtained that the dynamic performance of the structure with stabilizing cables with inclined angles is improved.The best beneficial conclusion.(4)The response spectrum analysis is used to analyze the displacement results of the structure without stabilizing cables,stabilizing cables and inclined stabilizing cables under the action of earthquakes.The inclined stabilizing cables can reduce the horizontal and vertical displacement of the structure and improve the seismic performance of the bridge. |
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