Review on Nonlinear Behavior Assessment of Reinforced Concrete Frames by Carbon Fiber Reinforced Polymers under Blast Loading

 

Mini Review

This review focuses on the numerical nonlinear analysis of blast pressure wave propagation on CFRP reinforced buildings. The frequency and severity of missile attacks and terrorist operations have led to the need for building strengthened structures against these dangers. The implementing of extreme and immediate explosive energy imposed to buildings needs special requirements. Also, the CFRP reinforced structures shows their ability in facing to various types of dynamic loads such as earthquakes, winds and waves. Their ability to respond to such intense loads is evaluated in this research. Explosion is a very fast release of energy in the form of light, heat, sound and shock wave. The shock wave consists of a very dense air that moves quickly from the center of explosion outward with ultrasonic velocity. By the expansion of the shock wave, the value of pressure decreases rapidly (proportional to distance, the third factor) and reflects after reaching a rigid surface, and its amount may increase up to thirteen times. The magnitude of the reflection coefficient is in close proximity of the explosive and the angle of the hitting wave. Pressure also decreases exponentially. In loading of an explosive, the loading time is very short, and it is usually expressed in terms of milliseconds. These days, due to the unpleasant spread of the threat imposed to human life by explosion, the analysis and designating of important structures such as military, governmental and fundamental, and utilities against these loads are not anymore, a costly conservatism but an inevitable necessity. Regarding explosive analysis and designing, due to the nature of these charges and applications of the building and also observing economic issues, different levels of performance for the structure under the explosive load are considered. On the other hand, using modern approaches and efficient materials the structure can be reinforced [1].


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