Numerical Analysis On Blast-resistant Capacity Of Reinforced Concrete Barriers Wall

The explosion was a phenomenon that a lot of energy released rapidly within alimited volume and a very short time.Explosion shock wave,fragment of the explosionwere structures pose a major hazard.With the frequent occurred of terrorist activitiesand industrial problems,a serious threat to people’s life and production.So,it becomesan important research field of Civil Engineering that enhances the blast resistantcapacity of building.Most structures were reinforced concrete structures,therefore,ithas a great significance to carry out the research of the blast resistant capacity ofreinforced concrete.The great significance are that to reduce the explosion damage tostructures,protect the state property and the life of the people and safeguardemergency rescue work successfully implemented when suffer from the terroristattacks.This article combine domestic and foreign steel and concrete materialconstitutive model,to numerical simulation analysis of the dynamic response ofreinforced concrete barriers walls under the explosive loading.The following work hasbeen done:（1）Explosion produce explosion pressure on the structure and distribution ofthe impact of obstacles.It is the key of numerical analysis that how to approximatereflect the experimental explosion loading.The article researched the propagation ofexplosion shock wave when dynamite explosion near the ground.Use the ANSYS/LS-DYNA to establish3D models to carry numerical simulation under the differentamount of explosives,then comparative analysis the simulation results and thereference test data.（2）Introduced the concrete material model MAT72R3,which can be adapt tolarge strain,high strain rate,high-pressure.The propagation rules of shock wave causedby TNT bombs in an obstructive field are analyzed,and the numerical simulation ofthe shock wave flows around an obstacle is conducted when the explosive detonates.The initial development of three-dimensional explosive field and the around-flowbehavior with an obstacle around explosive source are obtained.（3）In this paper,3D numerical models of reinforced concrete barriers walls areestablished by using software ANSYS/LS-DYNA,the steel bar and concrete aremodeled separately,and the bond slip between them is considered.In order to considerthe slippage of the reinforced concrete,the virtual spring is used to build the connection between rebar and concrete.One-dimensional slide lines for rebar inconcrete can be defined by CONTACT1D.The results of the two different modeling ofreinforced concrete barriers wall were compared,the advantages and disadvantages ofthem can be found in this analysis.All these work offer the theoretical principle andmeritorious reference data for anti-detonation design about the reinforced barrierswall.Finally,summary the article,draw to the main conclusions and give out issues thatdeserve further research in the future.