10.1 Concepts of Serviceability Limit States Design 10.1.1 Serviceability limit states In general,the most important serviceability limit states include Deflection-the appearance of a structure or any part of a structure must not be adversely affected by deflections. Cracking-the appearance or durability of a structure or any part of a structure must not be adversely affected by any cracking of the concrete. Durability -this must be considered in terms of the proposed life of a structure and its conditions of exposure.10.1 Concepts of Serviceability Limit States Design 10.1.1 Serviceability limit states In general, the most important serviceability limit states include Deflection – the appearance of a structure or any part of a structure must not be adversely affected by deflections. Cracking – the appearance or durability of a structure or any part of a structure must not be adversely affected by any cracking of the concrete. Durability – this must be considered in terms of the proposed life of a structure and its conditions of exposure