Finite Element Analysis on Lateral Impact Resistance of GFRP Tube Concrete-encased steel Members with Simple Support at Both Ends
The lateral impact resistance of GFRP tube concrete-encased steel member was studied to provide reference for the application of the members in engineering.The finite element model of GFRP tube concrete-encased steel member with simple support at both ends under lateral impact loading was established.Based on the verified model,the dynamic responses of typical member under lateral impact load,such as the whole process,failure mode,stress development,time history curve of interaction force and bending moment,were analyzed.Furthermore,the influence of impact energy,impact impulse,steel strength,thickness of GFRP tube and steel ratio on the impact resistance behavior of the member were investigated.The results show that the impact force duration time and the bending deformation of the member increase with the increase of the impact energy and impact impulse.The impact resistance performance of the member can be improved by increasing the strength of steel and the thickness of GFRP tubes.GFRP tubes has a good restraint effect on concrete,and the overall bending failure occurs under the lateral impact load.The plastic deformation of the internal steel is fully developed,and the lateral impact resistance of the member is superior.
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