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## Civil - Design of Reinforced Concrete Elements - Methods Of Design Of Concrete Structures

Posted On :  16.07.2016 01:57 pm

Limit state method is based on statistical concepts. Strength of materials and loads are highly variable in a range of values.

Limit state method is based on statistical concepts. Strength of materials and loads are highly variable in a range of values. The test in laboratory on compressive strength of concrete has indicated coefficient of variation of �10%. Hence in reinforced concrete construction, If is not practicable to specify a precise cube strength. Hence in limit state design uses the concept of �characteristic strength� fck indicates characteristics strength of concrete & by characteristic strength of steel. In general fk indicates the characteristic strength of material.

? fk = fm -1.646   (2.6) here fm = mean strength.

Similarly �characteristic load� is that value of load which has an accepted probability of not being exceeded during the life span of structure. In practice the load specified by IS875 � 1987 is considered as characteristic load. Equation for characteristic load is

Lk = Lm + 1.64_.

Tags : Civil - Design of Reinforced Concrete Elements - Methods Of Design Of Concrete Structures
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