Research On Wind-induced Response Of Long-span Radial Cable-stayed Pipe Bridge

Cable-stayed pipeline bridge is a common crossing structure in oil and gas transportation,it is a typical super flexible structure system with strong nonlinearity.This kind of structure has a smaller integral rigidity compared to normal bridge structures.So the cable-stayed pipeline bridge has a higher possibility to appear vibration phenomenon caused by wind,and this phenomenon will come out adverse wind-induced response in large-span cable-stayed pipeline bridge,which may do harm to the structure.While the bridge is damaged,not only economic loss will be caused,but also serious pollution will be generated to local environment.Due to the above reasons,it has very important practical significance to study the wind-induced response about cable-stayed pipeline bridge system.But there is a lack of this kind of study specialized in this particular system.This article learn the idea from other research about large-span cable-stayed pipeline bridge,study the wind-induced response of the system based on wind-induced theory,structural nonlinear theory,dynamic property of pipeline bridge and numerical modeling of wind load.The main content is as follows:(1)The three-dimensional finite element model of cable-stayed pipeline bridge is established by Abaqus according to its structure features.And the contact form,loading condition and check standard between the structure and constraint,assembly units are confirmed;(2)The three main factors influence geometric nonlinearity of cable-stayed pipeline bridge are expounded,and improved temperature cycle iteration method is used to confirm the intimate cable force of the stay cable.Based on the above,nonlinear static procedure is processed on cable-stayed pipeline bridge to determine completed bridge state.And simulation about influences auxiliary pier and its place will do to the static result is also been done;(3)Based on the completion state of bridge,analysis of nonlinear dynamic characteristics is been done about the cable-stayed pipeline bridge.Aim at auxiliary pier and its place,intimate cable force of the stay cable that influence the structure dynamic characteristics,sensitivity analysis is been processed;(4)Simulation theory of the steady gauss stochastic process is explained in details.According to engineering practice,fluctuating wind field data is been set.Apply the theory of harmonic synthesis,simulation about pulsating wind speed curve under the consideration of bridge tower wind effect is been made by Matlab about the cable-stayed pipeline bridge.And pulsating wind speed curve is turned into wind load time curve;(5)Wind-induced response model of cable-stayed pipeline bridge is been built based on Abaqus.The key points of the analysis are the influences that intimate cable force of the stay cable,auxiliary pier and its place and initial wind angle do to the structural wind response.The calculation and analysis of the finite element model of the cable-stayed pipeline bridge constructed in this paper combined with the actual engineering parameters are performed.The results obtained are in accordance with the actual situation.The research results of this paper provide certain theoretical basis for reducing the damage of wind-induced vibration to the cable-stayed bridge and improving its wind resistance reliability.