DYNAMIC RESPONSE ANALYSIS AND TEST STUDY ON FRP STRENGTHENED RC SLABS SUBJECTED TO BLAST LOADING

The existing protection engineering needs reinforcement to upgrade the anti-blasting resistance so as to remedy the deficiency of strength. A test study was conducted on four reinforced concrete(RC) slabs strengthened with FRP strips subjected to conventional munitions explosion loading. Normal slabs were tested as control specimens. The failure mode and crack patterns were evaluated to determine the failure characteristic of the slabs. The blast resistances were studied. The blast impact load was determined by using structure-medium interaction theory. The analytical model to predict the bending resistance of an FRP strengthened slab was proposed. The motion equations for structures were established by using medium-structure interaction theory. The dynamic response analysis of an FRP strengthened slab under conventional munitions explosion loading were presented. The calculated results are in a good agreement with the experimental results. The experimental and theoretical analysis results show that FRP strips are effective to mitigate the concrete cracking, to improve structural rigidity and to reduce structural displacement. The results also show that the slab strengthened with FRP strips increase its blast resistance capacity. At the ultimate state, the FRP strips failed due to the debonding and fracture from the slab surface.