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Study On Performance Of Partially Concrete-filled Steel Tubular (PCFST)Piers Under Lateral Impact

Posted on:2020-10-27Degree:MasterType:Thesis
Country:ChinaCandidate:W XuFull Text:PDF
GTID:2392330590958486Subject:Structural engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of transportation industry,the number of means of transportation has recently increased dramatically,and the carrying capacities of vehicles have continued to increase.Accidents of vehicle collision with urban bridges have occurred from time to time.The impact load has caused huge potential safety hazards to bridges and other structures.The safety of lives and the prosperity and the stability of society,were seriously threatened.Steel tubular piers have good application prospects in urban bridges due to their advantages of light weight,high strength and good ductility.In addition,by filling concrete at the bottom of steel tubular piers,it is expected to greatly improve the antiimpact performance of steel tubular piers.Therefore,this paper intended to carry out experimental and numerical studies on the impact response of partially concrete-filled steel tubular(PCFST)piers.Firstly,under the lateral impact,three rectangular hollow steel tubular and nine PCFST column specimens were tested.The concrete filling rate,the impact direction,and the impact energy were the main factors considered.During the test,the dynamic data acquisition system,high-speed camera and digital image correlation method were used to collect test response.The typical impact force,displacement and strain responses,as well as the failure modes of the specimens,were all analyzed.The test results showed that the impact resistance of PCFST columns were better than that of hollow steel tubular specimens.Secondly,finite element analysis(FEA)model was established using ABAQUS to simulate the impact test,which considered the strain rate effect and contact between steel and concrete.In addition,the FEA models were validated against the experimental data.Based on the validated model,parameter analysis was carried out to investigate the response of PCFST column under the combined action of lateral impact load and axial compression load.Lastly,simplified models of pickup truck and Ford F800 truck considering vehicle stiffness characteristics were used to study the response of full-scale piers under vehicle impact.The parameter analysis of concrete filling rate,impact mass,impact velocity and impact angle was carried out to study the anti-impact performance of piers.Besides,the influence of impactor stiffness characteristics on the response of vehicle-pier impact was also investigated.A rigid impactor model considering the reduction of energy dissipation due to the vehicle deformation was proposed,which could be used to analyze the collision problem between vehicles and column structures.
Keywords/Search Tags:Partially concrete-filled steel tube, Lateral impact, Digital image correlation method, Parameter analysis, Simplified vehicle model, Anti-impact performance
PDF Full Text Request
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