نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد شاهرود، شاهرود، ایران
2 استادیار، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد شاهرود، شاهرود، ایران
3 استادیار، دانشکده مهندسی معدن، دانشگاه آزاد اسلامی واحد شاهرود، شاهرود، ایران
چکیده .
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
In recent decades, many terrorist attacks have occurred all over the world, which have left many financial and human damages. As a result of these events, engineers felt the need to design explosion-resistant structures. Among the important structures in transportation systems arebridges. On the other hand, this important structure can be an attractive target for terrorist attacks.Therefore, the analysis and investigation of explosive loading on this structure is of great importance. Due to the frequency and expansion of the construction of concrete deck bridges in Iran, this research has investigated and numerically analyzed the deck slab of a reinforced concrete bridge. The parameters investigated in this research include deck displacement and deflection,stress, element removal, the amount of deck destruction and how cracks are formed, the change in scale distance, and the mass of the explosive material. Also, LS-DYNA finite element software has been used for modeling. The results show that on the concrete decks in the bridges, the parameters of the amount and location of the explosion are very important and effective in such a way that it causes extensive damage at the level of the nearby explosions. Based on the results obtained, with the increase in the weight of the explosive, the displacement and stress values in the structure increase in such a way that with the change of the explosive from 250 kg to 500 kg of TNT, the displacement value for the center of the bridge deck is 5.5 times and with the change Explosive material from 500 kg to 700 kg of TNT, we will see a 2.5 times increase in the displacement of the deck.
کلیدواژه‌ها [English]
)