What is the concept of limit state method?
Table of Contents
- 1 What is the concept of limit state method?
- 2 What are the assumptions made in the limit state method of design?
- 3 What are the assumptions made in elastic theory of RCC design?
- 4 What is meant by limit state mention the objectives of limit state method of design?
- 5 What do the factors of safety consider in limit states design method?
What is the concept of limit state method?
The Limit State Method is defined as a method which limits the structural use of the material of the structure up to a certain load at which acceptable limit of safety and serviceability are applied so that the failure of structure does not occur.
What is limit state method in structural design?
Limit state design (LSD) refers to a structural engineering design method. A degree of loading or other actions imposed on a structure can result in a ‘limit state’, where the structure’s condition no longer fulfils its design criteria, such as; fitness for use, structural integrity, durability, and so on.
What are the assumptions made in the limit state method of design?
What are the various assumptions made in the theory of Limit State of Collapse (flexure) in case of RC members? Plane sections normal to the axis remain plane after bending. The maximum strain in concrete at the outermost compression fibre is 0.0035 in bending. Tensile strength of concrete is ignored.
What is limit state design explain design philosophy?
In limit state design risk based evaluation criteria is included. Thus the philosophy of limit state design method is to see that the structure remains fit for use throughout its designed life by remaining within the acceptable limit of safety and serviceability requirements based on the risks involved.
What are the assumptions made in elastic theory of RCC design?
Fundamental assumptions of elastic theory of bending The concrete and steel reinforcement are perfectly bonded.It means that the tensile strain in steel reinforcement is equal to the tensile strain in concrete surrounding the steel. All tensile stresses are taken up by steel and none by concrete.
What are the assumptions made in the working stress method?
The basic assumptions in WSM are: Plane Section before bending will remain plane after bending. The stress-strain relationship will follow Hooke’s law. The tensile stress is taken by steel only.
What is meant by limit state mention the objectives of limit state method of design?
Limit states are the acceptable limits for the safety and serviceability requirements of the structure before failure occurs. The design of structures by this method will thus ensure that they will not reach limit states and will not become unfit for the use for which they are intended.
What is limit state design philosophy How is it different from the working stress method?
Difference Between Working Stress Method and Limit State Method
| Working Stress Method | Limit State Method |
|---|---|
| In working stress method, the material follows Hooke’s law as stress is not allowed to cross the yield limit. | Limit state method, stress is allowed to cross the yield limit. |
What do the factors of safety consider in limit states design method?
Limit state design approach considers that the structure should sustain all loads and deformations liable to occur during its construction, perform adequately in normal use, and have adequate durability.