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Lecture_2 - 1.2 Limit State Design(Design to BS 8110 1.2.1...

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7 1.2 Limit State Design (Design to BS 8110) 1.2.1 Introduction The design of engineering structures must ensure: o The structure is safe under the worst loading. o The deformation of the members does not detract from the appearance, durability or performance of the structure during normal working conditions. Design purpose – to achieve acceptable probabilities that a structure will not become unfit for its intended use – i.e., that will not reach a limit state . Two principal types of limit state: o Ultimate limit state relating to safety: The whole structure or its components should not collapse , overturn or buckle when subjected to design loads. o Serviceability limit state - relating to satisfactory performance: The structure should not become unfit for use due to excessive deflection and cracking. o Other limit states that may be reached include excessive vibration, fire resistance, fatigue, etc. 1.2.2 Characteristic material strengths ( f k ) Concrete strength it is based on the mean cube crushing strength (cube strength )
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