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

**Characteristic
strength and loads**

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.

? f_{k} =
f_{m} -1.646 (2.6) here f_{m}
= 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

L_{k}
= L_{m} + 1.64_.

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

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