In this article, we will discuss important TECHNICAL TERMS USED IN STEEL STRUCTURE DESIGN.
The self-weight of the structure along with all the super imposed loads permanently attached to the structure is call dead load of the structure. The dead load does not change the position or magnitude with time.
The load on a structure other than the dead load is called live load. The live load changes their position and magnitude with time such as weight of furniture, weight of occupants or peoples. It is expressed as uniformly distributed static load.
Working Stress or Permissible stress:
The allowable stress to which a structural member can be subjected is called working stress or permissible stress. It may be developed in the member without causing structural damage to it.
When a load is exerted or transferred from one surface to another in contact, the resulting stress is known as bearing stress. It is calculated on the net projected area of contact.
Factor Of safety:
The ratio of yield stress of the material to the working stress is called factor of safety. The value of factor of safety is decided keeping in view the average strength of the material, value of design loads, value of internal forces and variation in temperature and settlement of supports. It may be noted that for a greater value of factor of safety, a large cross-section of member has to be adopted.
Modulus of elasticity:
The ratio of longitudinal stress to the longitudinal strain within the elastic region is known as modulus of elasticity.
Modulus of rigidity:
The ratio of shear stress to shear strain within the elastic region is known as modulus of rigidity. It is also called shear modulus of elasticity.
Bulk modulus of Elasticity:
The ratio of hydrostatic stress of volumetric stress to the volumetric strain within the elastic region is called bulk modulus of elasticity.
The ratio of transverse strain or lateral strain to the longitudinal strain under an axial load is known as poisson’s ratio. Its value for steel within the elastic limit varies from 0.25 to 0.33.
The strength at which steel fails under repeated application of loads is known as fatigue strength.
The impact strength of steel is the measure of its ability to absorb energy at high rates of loading.
I hope that this article will be helpful in understanding TECHNICAL TERMS USED IN STEEL STRUCTURE DESIGN.
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