Designed & Detailed to BS 8110

BS 8110 and limit state

cobjective To serve its




purpose, design a structure must be safe against collapse

and be serviceable in use. Calculations alone do not

durable structures. Equally important are the produce safe, serviceable and

suitability of the materials, quality control and supervision of the

workmanship. Limit state through design admits that a structure may

a number of against defined limits of become unsatisfactory

ways which all have to be considered independently

satisfactory behaviour. It admits that there is an inherent

variability in loads, materials and methods of

and construction which makes it impossible design

to achieve complete safety against any possible shortcoming. By providing sufficient

of limit state will design is to provide

perform satisfactorily during an margins of safety, the aim

acceptable probability that the structure

its intended life. Limit states can he classified into two main (I) groups:

the ultimate limit state, which is concerned with the adequate safety; (2) the

serviceability durability. Generally, in practice, limit states, which are

provision of essentially concerned with there are three limit states which are

normally considered for reinforced concrete and these are given in the Table below.


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