Development of Special Explosive Charges for the Reconstruction of Unstable Damaged Buildings (original) (raw)
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MATEC Web of Conferences
The attenuation is a function of a structural strength and mass of the PES structure. Relatively light or weak structures (or open PES facilities) are assumed to not attenuate any of the pressure or impulse load. These not-attenuating facilities include: Pre-engineered metal building, Hollow clay tile building, Trailer (drop or stand-alone), Tractor-trailer and Bulk/tank truck/Van truck. If there is a barricade present between the PES and the ES and this barricade meets certain criteria, the user can direct the model to reduce the pressure and impulse arriving at the ES because of the presence of the barricade. The fractional damage of the PES structure remaining intact after an explosive event is a function of the equivalent NEW (Net Explosive Weight) and the PES building type. The fractional damage (a value between 0 and 1) of each PES component (roof, front wall, side walls, and rear wall) is determined by comparing the NEW to lower-bound and upper-bound damage limits for the PES...
Practical aspects regarding the evaluation of explosion protected equipment
MATEC Web of Conferences
Based on the experience accumulated over time on the evaluation of equipment and installations in environments with potentially explosive atmospheres, this paper is intended to be an element of synthesis on issues related to the “in situ” assessment and solutions of solvency the deficiencies found. The assessment of these installations is very important in order to verify the implementation of measures that lead to minimizing the risk of ignition of explosive atmospheres. Evaluation of these installations is made through an on-site visit and on the basis of the technical documentation developed by the care of the user. In first part of the paper were presented the legal aspects regarding the placing on the market and the use of equipment designed for potentially explosive atmospheres. The paper is continuing with the presenting the technical aspects regarding the evaluation of equipment and installations operating in potentially explosive atmospheres followed by requirements for ele...
5thEuropean Federation of Explosives Engineers,Budapest
Among the different accidental events related to important structures all over the world, explosive loads have received considerable attraction in recent years. On the other hand due to utilizing underground structures in various shapes such as road, railway and subway tunnels, water and sewerage conveying tunnels, urban underground facilities and shelter structures, evaluation of explosion resistant features for these structures has major importance. Since there have not been any established common standards or practices governing the design of protective structures ,at the present study by means of numerical analysis a subway tunnel adequacy for external explosion effects, was investigated. For this purpose in the first stage, a 2D developed numerical model analyzed by FLAC code and the results calibrated with an existing centrifuge model test results. In continue using the calibrated model the underground subway analyzed for various geological sections. Utilizing extracted results mainly in the form of internal forces in critical points of tunnel liner, the liner bearing capacity was investigated for induced blast effects.
2007
The demolition and rubble recycling industry is emerging as an alternative sector of the extractive industry and its development is fundamental from the environmental point of view. Concepts developed by the extractive industry find close analogies in demolition-recycling activity. The material processing relies on similar physical principles, and the same similarity is broadly observed in plant layout. The studied case is the side toppling of a 36 m high building, whose bearing structure was made of reinforced concrete factory cast walls and ceilings. Upon removal by mechanical cutting of a part of the walls, the remaining part of the bearing structure was blasted. The fall was studied through motion picture analysis, vibrometric records and numerical analysis, with the main aim of obtaining information on the resisting forces acting during the collapse. The practical objective was to obtain information and rules for the design of the basal notch and of the preliminary weakening, i...
Hasty Demolition of Concrete Structures
1961
Model Charge Tests on Reinforced Concrete Walls (Series 1), Showing the Three Methods of Priming Charge. ]4 Measuring of Explosive for Loading into Wooden Forms. 15 Method of Estimating Crater Volumec. 16 Walls Used for Testing Full-Scale Breaching Charges. 18 Tamping a Charge by Pressing Two Mud-filled Sandbags Against the Charge Taped to the Wall. 18 14 Top: Damage Inflicted with 21-pound Charge 2 Inches Thick. Bottom; Wall Breached with 2*pound Charge 1 Inch Thick. 20 x LIST OF ILLUSTRATIONS (cont'd) SCaption Page Rectangular Charge with a Length Three Times Its Height and a Ratio of Thickness to Contact Area of 1:125.
Basic concepts for explosion protection
Basic Concept for Explotion Protection, 2020
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Programs for calculating the explosion resistance of buildings and structures
IOP Conference Series: Earth and Environmental Science, 2017
Trends in the development of the oil and gas processing industry and facilities using liquefied hydrocarbon gases in the technological processes lead to an increase in the number of emergency situations and as a result to the increase of the damage and environmental degradation. A gasified housing stock is a special group of explosive objects. The accident in such disasters lead to hundreds of human victims. The main danger of explosive effects on objects can lead to a large-scale destruction connected with an "internal explosion". It results in the release of combustible substances (gas, oil, etc.) into enclosed or semi-enclosed rooms (modules) with the ignition (in explosion mode of deflagration or detonation) of air gas mixtures (AGM).
MATEC Web of Conferences
Design and efficient implementation of OSH management in the field of explosives for civilian use, having the effect of optimizing the activity of preventing unwanted events blast type specific to industrial locations intended for the preparation / storage of explosives for civil use, constitutes it explosion risk assessment which represents the integrated expression of the configuration components of this type of risk within the different accident scenarios. No matter what it's about a component within the location or his integral technical infrastructure such an analysis allows the identification and ranking of site specific accident hazards to be assessed, in order to properly allocate security resources for priority measures to prevent and combat / eliminate the causes of these types of dangerous events. To this end, the ”Security Document” specific to the industrial site intended for specific operations with explosive materials must demonstrate that: an appropriate accident...