# Factor of safety

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## factor of safety

[′fak·tər əv ′sāf·tē]
(mechanics)
The ratio between the breaking load on a member, appliance, or hoisting rope and the safe permissible load on it. Also known as safety factor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## Factor of safety

A factor used in structural design to provide a margin of safety against collapse or serious structural damage. It allows for any inaccurate assumptions in the loading conditions, inadequate control over quality of workmanship, and imperfections in the materials, but not mathematical errors.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

## factor of safety, safety factor

1. The ratio of the ultimate stress of a structure or pressure vessel to the design working stress.
2. The ratio of the ultimate breaking strength of a member or piece of material or equipment to the actual working stress or safe load when in use.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The comparison of factor of safety of expansive soil cutting slope treated by geogrid reinforced flexible structure or not are only focused in this paper.
In order to be able to estimate [P.sub.f], it is necessary to estimate the standard deviations of the parameters involved in computing the factor of safety. It is observed from the [FS.sub.min] distribution that the COV ranges from 0.164 to 0.174.
Unfortunately, the retaining wall could not increase the factor of safety. So, the other possible remedial measure, that is mud level reduction, is necessary to increase the factor of safety up to a value of 1.3, which might be acceptable for a temporary dam structure.
The current version of the simplified procedure calculates the factor of safety FS against liquefaction of a level ground in terms of the cyclic stress ratio CSR (the demand), and the cyclic resistance ratio CRR (the capacity) according to:
A custom code, based on the Goodman fatigue method, was used with Marc to evaluate the factor of safety for each element of the model,
where [f.sub.s] represents the factor of safety at the grid node, [[tau].sub.u] represents shear strength, c is the cohesion, [phi] is the friction angle, and [P.sub.w] is the pore pressure when below ground water table.
To design a soil slope that is reinforced with piles, engineers and technicians are concerned with two significant parameters: the load that a pile should sustain and the location of the slip surface for the slope with piles under a prescribed factor of safety. Many investigators have studied this problem, and some methods have been proposed.
Due to the absence of nes content data (passing sieve # 200), liquefaction potential has been determined by computation of factor of safety at different percentages of nes content i.e.
The procedure for determining factor of safety and probability of liquefaction for a soil element in a CPT profile and the probability of ground failure at a site is described in the following.
The highest moment in the areas where high-strength concrete was placed was 7.7 lb-in., while the material capacity was 875 lb-in., giving it a factor of safety slightly higher than 10.

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