Finite Element Analysis Of Antiknock Performance Of CFRP Confined Concrete Filled Steel Cylindrical Columns

In recent years,more explosive terrorist attacks targeting important buildings as well as some unexpected incidents like gas explosion and other explosions in industrial production frequently occur.The explosive impact loads has great effect on the normal use of building structure and the safety of human life and property,which,as a result,may lead to structural failure,continuous collapse and even casualties.It is very necessary to improve the ability of building structures or components to resist explosive impact loads by using high-performance fiber to reinforce composites.It is also an important direction for developing the front-line anti-explosive technology on buildings’ protection.Concrete filled steel(CFST)structure confined by CFRP is a new type formed by sticking carbon fiber reinforced plastics(CFRP)around the concrete-filled tube(CFST).Some scholars at home and abroad now have done many researches on concrete-filled tube columns confined by CFRP,who pay more attentions on the static as well as anti-seismic performance than the anti-explosive.This thesis,taking concrete-filled steel tubular columns confined by CFRP as the research object,numerical stimulates its anti-explosion performance under different influence factors resorting to finite element software ANSYS/LS-DYNA and then analyzes its dynamic response under explosion load by combining with related theories.The main research contents and results are as follows:(1)This paper,based on the finite element software ANSYS/LS-DYNA,does the modeling of explosives,air,steel tubes and concrete by using SOLID164 solid elements while of CFRP by using SHELL163 thin shell elements,and then numerical simulates the existing explosion tests of concrete-filled steel tube columns by adopting the fluid-solid couplingmethod.It verifies the feasibility of material models as well as test methods after making a contrastive analysis on the results of the numerical simulation and the test.(2)In this thesis,it also shows influence rules of CFRP adhesive layer number,explosive quantity,and wall thickness as well as slenderness ratio of steel tube on its anti-explosive performance through changing the model parameters of concrete-filled steel tube(CFST)confined by CFRP.(3)Based on the research results of concrete-filled steel tube(CFST)unified theory,this thesis infers the composite stiffness and the plastic limit bending moment of concrete-filled steel tube(CFST)confined by CFRP.And it also infers dynamic response of concrete-filled steel tube(CFST)columns confined by CFRP under explosive load resorting to the equivalent single-degree of freedom method so as to make a contrastive analysis on the maximum displacement of the column span obtained and numerical simulation results.