جستجوی مقالات مرتبط با کلیدواژه « پناهگاه زیرزمینی » در نشریات گروه « فنی و مهندسی »

Underground structures such as sanctuaries and tunnels are considered as important and strategic structures. The response of an underground structure to loading from a surface explosion is a major issue in passive defence. So far, many studies have been carried out on various parameters such as ground response, structure response, field experiments, etc. However, there are still many unknown and vague aspects of the explosion and its impact on the soil and structure environment. In this study, the effect of soil moisture on the safety of an underground shelter has been investigated for the different amount of stress and displacement. Autodine software has been used to model the underground shelter, and two Lagrangian and Eulerian environments have been considered. The chosen explosive charge in this study is 52.16 kg of TNT, and the data is recorded using the gauges enclosed in the model. The results show that increase in the degree of saturation of the soil layer has increased the excessive pressure from the soil, and as a result, the von Mises stress in the concrete and steel system has increased and led to the deterioration of the situation.

The main purpose of this paper is to develop a design guide for locating underground urban shelters based on the criteria that are used in the passive defense. Today, the passive defense alongside the defense is one of the security systems for residential settlements of interest to urban planners; underground shelters are one of the main examples of the passive defense among them. Underground shelters once more emphasize that sub-surface structures such as subway lines and spaces such as underground shops and shopping centers are defined as urban elements in the urban spatial structure. Therefore, this research is based on passive defense criteria and attempts to find the desirable location of underground shelters on the metro stations of Tabriz Metro Station. The method of this research is descriptive-analytic and based on its purpose, and it is an applied research. The technique used to prioritize and weigh the criteria is the Delphi technique and the technique to prioritize the choices that are made to establish desirable locations is the AHP technology shelters. Accordingly, the five main criteria were developed from non-operational defenses, namely access criteria, demographic criteria, environmental permeability, physical criteria and performance criteria, and a total of 25 sub-criteria. Finally, after comparing the stations as the location of the shelters On the central stations of Tabriz Metro Line 1 and 2, Station 6 was selected as the desirable station for the deployment of a refuge on Tabriz Metro Line 2.