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# What is design accidental load?

## What is design accidental load?

Design accidental loads can be prescriptive or defined by the results from a risk analysis. The four most common accidental loads which have to be designed for are. Heat load – incident heat for a certain time period. Blast load – pressure on a surface area as a function of time.

## What are the accidental loads?

Accidental loads are loads which occur as a direct result of an accident or exceptional circumstances, e.g., loads due to collisions, dropped objects and explosions, etc.

What is blast load in offshore?

Blast loading is significantly different from the other forms of loading normally considered in the design of offshore topside structures because of its dynamic nature, the response of the structural system, and the fundamental uncertainties associated with the design event.

IS Code 4991
To know the response of a structure when subjected to blast loads of different standoff distances & various charge weights. To knowing the response of a building when subjected to blast loadings using ETABS software as per IS Code 4991.

A Blast Load is the load applied to a structure or object from a blast wave, which is described by the combination of overpressure and either impulse or duration that causes catastrophic damage to the building both externally and internally.

How do you calculate blast load?

 Calculation of structural blast loads Blast pressure determination is based on computation of, Scaled distance Explosive mass Actual distance from the center of spherical explosion  Calculation of pressure loads on building surface Blast wave and structural interaction: A structure subjected to an external …

#### How do you calculate the force of an explosion?

I find the angle of the explosion point from the object by atan2(x1-x2,y1-y2)*180/PI. Find the resulting X force by F * cos(angle) Find the resulting Y force by F * sin(angle) Use these to assign the Force vector and apply it to the object.

#### How do you calculate overpressure?

In practical applications, the overpressure peak of Equation (2) is usually expressed in the following form,(5) p m = s 1 R g + s 2 R g 2 + s 3 R g 3 where Rg is the scaled-distance between the point and the detonation point.

What is the psi of an explosion?

So, ALOHA uses default overpressure values (in pounds per square inch, psi) that are based on a review of several widely accepted sources on overpressure and explosions: 8.0 psi (destruction of buildings) 3.5 psi (serious injury likely) 1.0 psi (shatters glass)

## How is blast radius calculated?

Calculate the blast radius. Square the distance of the blast and multiply it by pi (3.14). With a 1.79 mile distance, the blast radius of a 2-psi overpressure would be 10.1 square miles.

## What is the peak overpressure?

The maximum value of overpressure at a given location which is generally experienced at the instant the shock (or blast) wave reaches that location. Dictionary of Military and Associated Terms.

What is the expected damage from an overpressure of 1 psig?

Level of damage expected at specific overpressure values

Overpressure* (psig) Expected Damage
14.5-29.0 Range for 1-99% fatalities among exposed populations due to direct blast effects.
* These are peak pressures formed in excess of normal atmospheric pressure by blast and shock waves.