Sharif Digital Repository

Over the last years, terrorist attacks and accidental explosions have brought on a need for research in the field of structural engineering to study the response of a building subjected to blast loading conditions. An explosion within or surrounding a building, not only can have disastrous effects causing both structural damage or failure, but may also lead to the death of human beings.In order to prevent these catastrophes and gain a better understanding of responses of the buildings and lateral resisting systems with different characteristics, the study of the behavior of the lateral resisting systems under blast loading conditions is essential. This research will also aid in the... 

On Grade steel tanks are widely used in petroleum complexes, refineries, power plants and many urban facilities. Increasing the number of attacks, incident reports and operational events happening in refineries proves the sensitivity of these strategic facilities against various Hazards such as explosion. So, the damage assessment of tanks after the explosion is important for their maintenance and repair.Since some of the tanks containing flammable materials, quick action to estimate the possible damage and required strengthening and retrofitting or disconnecting the input to a plant lifeline is of utmost importance. Therefore, special attention to study the blast loading and the study of... 

Underground gas pipelines are one of the vital parts of each country which surface blasts can break them down, make destructive explosions and threaten the safety of neighborhood structures and people. In this paper, to enhance the safety of these lines, response of buried 56 inch high pressure gas pipeline to a surface blast is numerically investigated. Beside the main aim, parametric studies on the effects of: i) explosive mass, ii) pipeline thickness, iii) burial depth and iv) concrete protective layer, on pipeline deformation are performed. To simulate the problem according to actual explosion events, geometries are modeled in real scales, pipeline properties are predicted with... 

The on grade flexible steel storage tanks are extensively used in oil refineries, petrochemical plants, power plants and many other municipal utilities. The increasing statistics of various incidents and attacks occurred to these facilities clearly indicates the vulnerability of these strategic installations under the effects of intentional (terrorist) blasts. Therefore, Given the strategic nature of the care and maintenance for these tanks, their damage assessment under the prescribed explosion is quite important. Due to flammable content of some of these tanks, it is necessary to speed up the process of their vulnerability assessment and making the appropriate decisions for any needed... 

Public transit system has become one of the targets of terrorist attacks using explosives, examples of which include the 1995 attack on Paris subway and the 2004 attack on Moscow subway. Under the present context of intense threats of terrorist attacks on subway systems in metropolitan areas around the world, explicit three-dimensional Finite Element method was used to investigate the dynamic response and damage of subway structures under internal blast loading. The study was motivated by the fact that explosion in subway structure may not only cause direct life loss, but also damage the subway structure and lead to further loss of lives and properties. The study used the Mashhadsubway... 

One of the methods of drilling coal mines is mine blasting (drilling with explosives). In this method, explosives such as dynamite are used to excavate the mine and destroy the coal seams. During this type of drilling, in addition to dust, dangerous toxic gases are also produced, so quick and proper ventilation of mine tunnels is necessary in this type of drilling.Depending on the type of mining, the required ventilation system may be different. For example, if the drilling method is long-term method, the mine ventilation is of the U type, but if the mine drilling is the sub-level caving type, auxiliary ventilation is used.In this study, the method of mining is sub-level caving, so that one...