# Tag: Equilibrium Equilibrium of Structures

A structure is considered to be in equilibrium if, initially at rest, it remains at rest when subjected to a system of forces and couples. If a structure is in equilibrium, then all its members and parts are also in equilibrium. In order for a structure to be in equilibrium, all the forces and couples (including support reactions) acting on

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# Tag: Equilibrium Stress and Strain

Structural capacity, or ultimate strength, is that property of a structural member that serves as a measure of is ability to support all potential loads without severe cracking or excessive deformations. To indicate when the limit on load-carrying usefulness has been reached, design specifications for the various structural materials establish allowable unit stresses or design strengths that may not be exceeded under  maximum loading.

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# Tag: Equilibrium Equations of Equilibrium

When a body is in static equilibrium, no translation or rotation occurs in any direction (neglecting cases of constant velocity). Since there is no translation, the sum of the forces acting on the body must be zero. Since there is no rotation, the sum of the moments about any point must be zero. In a two-dimensional space, these conditions can be written: where

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# Tag: Equilibrium Moments of Forces

A force acting on a body may have a tendency to rotate it. The measure of this tendency is the moment of the force about the axis of rotation. The moment of a force about a specific  point equals the product of the magnitude of the force and the normal distance between the point and the line of action of the force.

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