Abstract
During dynamic events such as impact and blast loading, structures experience high rates of loading and the materials experience elevated strain-rates. During such events, a large amount of energy is also suddenly imparted to the structure. If the structure fails to absorb the incoming energy, a sudden, catastrophic collapse may occur. In spite of our continued efforts to understand the impact resistance of reinforced concrete elements, our comprehension in this area remains severely limited. There also remains a critical need to devise techniques of strengthening structures under impact loading. Impact tests were carried out on simply supported reinforced concrete beams using a fully instrumented drop-weight impact machine. The drop height was varied to change the rate of loading, and companion tests were carried out at slow, quasi-static rates of loading. The effectiveness of externally bonded fiber reinforced polymers (FRP) sheets in enhancing the impact resistance of reinforced concrete beams was also investigated. Results demonstrate that the ultimate load carrying capacity of reinforced concrete beams increases with an increase in the rates of loading, but after a certain loading-rate, a plateau in the load capacity is attained. Externally bonded fiber reinforced polymer sheets are highly effective in increasing the resistance of RC beams to impact loading.
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