Question

Why we need to use elastic limit state?

Answer 1

A limit state is a condition of a structure beyond which it no longer fulfills the relevant design criteria.The condition may refer to a degree of loading or other actions on the structure, while the criteria refer to structural integrity, fitness for use, durability or other design requirements.

Limit state design requires the structure to satisfy two principal criteria: the ultimate limit state and the serviceability limit state

Any design process involves a number of assumptions. The loads to which a structure will be subjected must be estimated, sizes of members to check must be chosen and design criteria must be selected. All engineering design criteria have a common goal: that of ensuring a safe structure and ensuring the functionality of the structure.

1)ULS is not a physical situation but rather an agreed computational condition that must be fulfilled, among other additional criteria, in order to comply with the engineering demands for strength and stability under design loads. A structure is deemed to satisfy the ultimate limit state criterion if all factored bending, shear and tensile or compressive stresses are below the factored resistances calculated for the section under consideration.

2)

Serviceability limit state (SLS)Edit

a) limit state of deflection

b)limi state of cracking

c)limi state of vibration