Hello Civil Engineers, Thank you for visiting howtocivil.com. By this article, you are going to learn the basic differences between the WSD(Working Stress Design ) Method and the USD (Ultimate Stress Design) Method of Reinforced Concrete Structure Design. This comparative article on USD and WSD methods of design concrete structures will describe a brief comparison of these two methods based on their design methods, Strength, Durability, etc. 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
The Difference between Working Stress Design and Ultimate Stress Design Method of Reinforced Concrete structure Are following,
[epcl_box type=”notice”]WSD VS USD Method[/epcl_box]
| USD(Ultimate Stress Design) Method | WSD(Working Stress Design) Method | |
| 1 | Ultimate Stress Design(USD) Method is define as the method of design structural members by considering the ultimate Strength of steel and concrete is called USD Method. | Working Stress Design method is define as the method of design structural members by considering the allowable Strength of steel and concrete is called WSD Method. |
| 2 | It’s primarily based on the strength concept of Concrete. | It’s based on the linear theory or elastic theory. |
| 3 | Factor of Safety is considered in this design. | Factor of Safety is not considered in this design. |
| 4 | It’s Consider to Design Critical Combination of load | It’s Consider to Design carrying load |
| 5 | It’s designing for elastic behavior of materials. | It’s designing to plastic behavior of materials |
| 6 | Materials strength to be used for member design | Modular Ratio used for member design |
| 7 | Stability of Structure is more than WSD | Stability of Structure is less than USD |
| 8 | It’s a modern design method. | It’s a pretty old design method. |
| 9 | This method is used for mostly the biggest structures and developed nations. | This type of method is used for mostly small structures and undeveloped nations. |
| 10 | Economical Design method. | Less economical Design method. |
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