Is LSM better than WSM?

1) Serviceability check in case of LSM is required because after the elastic region strain is higher, which results in more deformation, hence a check is necessary. 2) LSM is strain based method whereas WSM is stress based method. 3) LSM is non-deterministic method whereas WSM is deterministic approach.

What is the difference between working stress approach and limit state approach?

In limit states design, we consider the structure to have failed when it reaches the lower yield point. In working stress design, the design strength is calculated such that the stress in the material is restrained to its yield point, under which the material follows Hooke’s law, and hence the term “elastic” is used.

What is the difference between working stress design and ultimate strength design?

Ultimate Strength Design method is used extensively and almost exclusively in many countries for structural design practice . The Working Stress Design (WSD) method designs RC sections assuming them to be within their elastic limits, where stresses are proportional to strains.

What is the difference between working load and ultimate load?

The ultimate loads are obtained by increasing the working/service loads suitably by some factors. These factors which are multiplied by the working loads to obtain ultimate loads are called as load factors. These load factors give the exact margins of safety in terms of load.

Is code for WSM and LSM?

Difference b/w WSM & LSM:

Working Stress Method	Limit State Method
Stress- Strain behavior is linear.	Stress-Strain behavior is non-linear.
WSM is also known as plastic design.	LSM is also known as Elastic design.
WSM is Stress based method of RCC design.	LSM is Strain based method of RCC design.

Why LSM is referred to as non deterministic method?

This method assumes that the actual loads, permissible stresses and factors of safety are known. So it is called as deterministic method. This method is based upon the probabilistic approach which depends upon the actual data or experience, hence it is called as non-deterministic method.

Which is better WSD or USD?

You will get the theoretical Definition of Working Stress Design and Ultimate Stress Design and their Assumptions from the linked article….Difference Between WSD and USD Method.

	USD(Ultimate Stress Design) Method	WSD(Working Stress Design) Method
7	Stability of Structure is more than WSD	Stability of Structure is less than USD

What is the difference between ultimate stress and working stress?

When designing machine parts, it is desirable to keep the stress lower than the maximum or ultimate stress at which failure of the material takes place. This stress is known as the working stress or design stress. It is also known as safe or allowable stress.

What are the 3 methods of design?

There are three methods of structural design, i.e. working stress, limit state and ultimate load method of structural design. These design methods are used for reinforced concrete as well as steel structure design.

What are the assumptions of LSM?

Welcome back.

• 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.
• Maximum strain in the tension reinforcement in the section at failure shall not be less.