Prediction Of Blast Loads Based On The Expected Damage Level By Using Displacement Based Method
Free (open access)
P. F. Silva, B. Lu & A. Nanni
The equivalent viscous damping (EVD) ratio is a crucial parameter in the application of the displacement based method. Previous works have correlated the EVD ratio as a function of the displacement ductility level based on the hysteretic response of reinforced concrete members subjected to blast loads. Furthermore, the displacement response factor (DRF) for blast loads was proved as a function of the EVD ratio and the ratio of impulse duration to the natural period. The explosive charge weight and stand-off distance required to impose a given damage level were predicted by the DBD method based on these research results. In order to examine the feasibility of assessing the blast-resistant capacity of concrete (RC) slabs using the displacement based design (DBD) method. A RC slab was tested under real blast loads in the out-of-plane direction. Test results showed that the blast loads were effectively estimated and the damage levels observed from the field tests correlated well with the predicted levels. Keywords: equivalent viscous damping; displacement based method; ductility; blast-resistant; displacement response factor. 1 Introduction Recent events have drawn considerable attention to the vulnerability and sustainability of structural members subjected to improvised explosive devices (IED). Since protection is never an absolute concept and there is a level of high cost associated with a given damage level of protection, proper assessment tools must be employed to determine within a reasonable degree of accuracy the level of vulnerability of existing and new structures. Furthermore, in blast design, one
equivalent viscous damping; displacement based method; ductility; blast-resistant; displacement response factor.