Why LSM method is more preferable than WSM methods?

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. 3) LSM is non-deterministic method whereas WSM is deterministic approach. 4) The partial safety factor is used in LSM whereas Safety factor is used in WSM.

Why do we use WSM in case of water tanks rather than LSM?

Why Working Stress Method (WSM) for Water Tanks? Water tanks or any liquid retaining structures are vulnerable to stresses with the variation of water level in it. When compared with limit state method of design, the WSM method provide more serviceability that help to increase the durability and life of water tanks.

What are the advantages of working stress method?

Advantages of WSM:

• It is simple, both in concept as well as in application.
• It is reasonably reliable.
• It is essential to have a knowledge of WSM, since it forms a part of LSM. IS:456-2000 has incorporated LSM and WSM.
• The design usually results in large sections of structural members as compared to LSM.

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

Workin stress method is based method of R.C.C Design. Limit state method is based method of R.C.C Design. 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.

Why working stress method is used for water tank?

Working stress method is adopted as it does not account for the variation of loads and the design is mostly conservative. Water tanks are more vulnerable. Moreover, the Working stress method offers more serviceability when compared to the Limit state method which extends the lifespan of the structure.

What is the difference between the working stress method and the limit state method described in the Indian steel design code?

The cardinal difference between Working state method (WSM) and Limit State method (LSM) is: WSM is an elastic design method whereas LSM is a plastic design method. Hence the “moment-rotation” capacity of beam, for example, is utilized making the design more economical.

What are the limitations of working stress method?

Limitations of working stress method : The assumptions of linear elastic behaviour and control of stresses within specially defined permissible stresses are unrealistic due to several reasons viz., creep, shrinkage and other long term effects, stress concentration and other secondary effects.