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Dynamic responses and failure modes of RC columns under blast loading

SHI Yanchao,LI Zhongxian(School of Civil Engineering,Tianjin University,Tianjin 300072,China)  
The dynamic response of reinforced concrete(RC) member and structure under blast loading is much more complicated than that under other loadings such as earthquake loading and static loading,since the blast wave propagates fast and the load acting on the structure appears at the peak value for a short duration.In this paper,3D numerical models of typical RC columns are established by using software LS-DYNA.In the model,the steel bar and concrete are modelled separately,and the bond slip between them is considered.The strain rate effects of the two materials are also included in the numerical model.Based on the model,numerical simulations are carried out to learn the possible failure modes of RC column under blast loading.Parametric studies are also adopted to investigate the effects of moment of section inertia,concrete strength,longitudinal and transverse reinforcement ratio on the dynamic response of RC column under blast loading.Some suggestion on designing the RC column to resist blast loads is proposed based on the numerical results.It is found that the failure modes of RC column under blast loading depend not only on the column properties,but also on the blast loading type.The results also show that by increasing the moment of section inertia and concrete strength,the lateral displacement of mid RC column can be dramatically decreased under blast loads;by increasing the moment of section inertia,concrete strength and transverse reinforcement ratio,the blast resistant capacity of the RC column can be increased.
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