جستجوی مقالات مرتبط با کلیدواژه « explosion loading » در نشریات گروه « عمران »

Nowdays, for the designing of underground structures in addition to common loads such as earthquakes, explosives loading is considered. Most of these structures around the world are constructed in a safe depth in the soil. The depth of earth where underground structure under explosive forces does not receive damage, called “safe”. The depth in design and construction of underground structures for use more of the anchor properties of the soil around the structure and minimize the structural weight and also using the damping properties of the soil to reduce the shock wave caused by the explosion of the exact penetrating weapons. Usually explosive loading of these structures is based on the relations and procedures from theoretical and experimental research. Also the numerical methods and using finite element softwares to calculate the explosion load of these structures has been prevalent. In this study the effects of buried explosion on a reinforced concrete underground structure is investigated numerically and analytically. The numerical simulation was carried out using finite element software AUTODYN. In order to analyze the how to explosive loading and underground structure response, the effect of weight of explosive and buried depth of structures was investigated. Additionally, numerical results with relations that presented in reliable scientific resources and US instructions for designing this type of structures were compared. Finally, according to the results of research, in order to improve the designing of these structures under explosion loading in soil, it’s suggested that the incremental factor doesn’t apply to such loads.

Using underground spaces with regards to population expansion and the troubles of rail transportation is one of the basic infrastructure in developing countries. To this aim, life preservation of people and servicing them in important instances like accidental explosion conditions has a special importance. the dual application of tunnels and underground metro stations both as a sanctuary and as a means of transport; therefore, investigating the explosion impact in such constructions and an appropriate estimation about the imposed loads on them through the explosion is one of the most important aspects of passive defense.
In this study, the effects of tunnel cross-section geometry on the performance of the tunnel under explosion loading have been investigated using centrifuge modelling. Cross section of tunnels modeled in this study consists of rectangular, horseshoe and circular. According to the results, optimized cross-sections can be circular or horseshoe design is based on design targets.