Answer / mizpah

Working stress method of design based on the elastic theory in which materials, concrete and steel are assumed to be stressed well below their elastic limit under the design loads. Working stressess (permissible stress) for the materials are determined by dividing the ultimate or yield stressess by suitable factor of safety values.

Limit state method of design based on limit state concept, te structure shall be designed to withstand safely all loads liable to act on it throughout its life;It shall also satisfy the serviceability requirements, such as limitations on deflection and cracking. The acceptable limit for the safety and serviceability requirements before failure occurs is called a "limit state". The aim of design is to achieve acceptable probabilities that the structure will not become unfit for the use for which is intended, that is that it will not reach a limit state...

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Respected Sir, I am from a hilly place called Darjeeling ,I have constructed house of 9 column out of which 4 of the column is under water , i have put rcc slab on top and on top of the rcc slab i have construced two room house with bricks and light roof , now i am planning to change the light roof with rcc slab for the two room, my main concern is will the column under water will hold the load of the new rcc slab coz it already 10 to 12 yrs old , i dont know what to do , can u advice me regarding this matter, weather to leave the upper floor roof light or make it rcc slab.(If i put the slab , it will require 45bags of cement and u calculate how much of steel and sand and pebbles) thanks with regard Anand

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