جستجوی مقالات مرتبط با کلیدواژه "terrorist attacks" در نشریات گروه "عمران"

Parking floors in buildings are of the most likely places for terrorist bombings. While terrorist attacks across the globe have increased remarkably in the last decades, it is important to recognize the behavior of existing structures against explosions and to find appropriate solutions to reduce the resulting damages. In this study, the failure probability of a 10-story reinforced concrete building subject to a vehicle bombing in random locations in the ground floor is evaluated. For this evaluation, reliability analysis of the building structure is conducted using a Monte Carlo simulation method and the results are obtained using a dynamic analysis of a finite element model and LS-DYNA software. The random variables considered herein are the location of the explosion, the time history of the blast loading, the gravity loads and the slab depth. In order to investigate the effect of the explosion location on the probability of failure, the building plan was first divided into three categories including the center, side and corner areas, then by randomly generating the explosion in each area, the probability of different level of damages to the building was calculated. Based on the results obtained in this study, the probability of failure in the central area of the plan is more significantly compared with those of the other areas. Finally, it is shown that by strengthening the central columns, the probability of heavy damages (damages greater than 55%) for blast loadings containing 600, 750 and 900 Kg TNT charge weights is reduced to 52%, 56% and 77%, respectively.

Terrorist attacks are one of the biggest challenges in the world in the 21st century. Every year, thousands of people around the world die as a result of terrorist attacks. Meanwhile, metropolitan areas are one of the most important spaces where most terrorist attacks are organized and carried out, so that terrorism can be considered a fundamentally urban phenomenon. Iran and its major cities are also at risk of terrorist attacks due to regional characteristics and the existence of terrorist groups opposed to the regime. In the metropolis of Kermanshah, critical infrastructure, public places and centers of political power are potentially vulnerable to terrorist attacks. In this research, which has been done by descriptive-analytical method, while examining the geographical centers of terrorist attacks in metropolitan areas of the world, the most important places of this type of attacks and the extent of vulnerability of Kermanshah areas against terrorist attacks have been analyzed. . The results show that the infrastructure of Kermanshah refinery, water storage tanks and main tanks, tanks and warehouses of petrochemical and chemical materials, polluting industries (pollutants) of the environment along with residential areas and also the existence of some chemical production units as workshops in the city And the establishment of production units with the risk of pollution near the city due to physical-spatial features, population concentration, etc .; The most vulnerable infrastructure is to terrorist attacks