Abstract
Since the 9.11 attacks in New York, terrorist attacks, military strikes, and accidental explosions have caused serious damage to various infrastructures around the world. Accidental traffic explosions in bridge engineering have occurred frequently due to the increasing firework truck on the bridge and heavy fuel oil ships under the bridge. Besides, intentional car bomb explosions in terrorist attacks and military assaults are significant threats to the bridge structure. Bridge pier is a particularly important component of the overall bridge structure due to its vertical support capacity. Therefore, the damage of reinforced concrete (RC) piers under blast loading should be studied. In this paper, the pier is simplified as a single degree of freedom (SDOF) system based on energy equality, and the blast loading distribution on the surface of the pier is simplified as a uniform distribution. Then, the P-I curves of an RC pier are obtained based on the SDOF system and a uniform distribution blast loading to quickly evaluate the damage extent of an RC pier so that the P-I curves and fitting formulas for different damage extents can be used for practical engineering. After a numerical simulation verification, the P-I curves and fitting formulas based on the simplified method can supply a rapid and effective method for engineers to assess the postexplosive damage of an RC pier.
Highlights
Since the 9.11 attacks in New York, terrorist attacks, military strikes, and accidental explosions have caused serious damage to various infrastructures around the world [1]
When the blast loading is in zone A, the actual structural damage extent is more significant than what is stated by the P-I curve
When the blast loading is in zone B, the actual structural damage extent is less than what is stated by the P-I curve. ere are a series of P-I curves in a structural damage extent diagram, where each td t (b) td t (c)
Summary
Since the 9.11 attacks in New York, terrorist attacks, military strikes, and accidental explosions have caused serious damage to various infrastructures around the world [1]. Test method can reliably get the P-I curve for a specific structure by a large number of blasting experiments, in which overpressure and impulse on the structural surface at different damage extents are obtained. It is an economically and logistically poor choice and is hard to apply to actual engineering. Erefore, the equivalent SDOF method is used to calculate the structural dynamic response and determine the P-I curve of a bridge pier in this paper so that the damage extent can be quickly evaluated.
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