Design for SLS according to fib Model Code 2010

The present paper provides an overview of serviceability specifications given by the fib Model Code 2010 (MC2010 [1]). First the reasons of crack control and deflection control are discussed, then specific design rules are provided. Simple rules as well as detailed models are also presented. Numerical examples are also provided in order to help application of the design recommendations for crack control (reinforced and prestressed concrete elements) and for deflection control (reinforced and prestressed concrete elements), respectively. Simple rules mean indirect control of cracking or deflections without calculations. Indirect crack control may include limitation of stresses and selection of maximum bar diameter or maximum bar spacing. Indirect deflection control normally means limitation of the span to depth ratio. Detailed models are based on physical and mathematical approaches of cracking and deflections. The design crack width is expressed as the multiple of maximum bond transfer length multiplied by the mean strain between cracks. Deflection analysis can be provided by integration of curvatures or using a simplified or a refined method. Vibrations and numerical modelling of cracking are also briefly discussed. Crack width limits, tension stiffening, span-depth ratio