The crack width for lower values of concrete cover or grade of steel while the Indian standard as well as the other expressions under estimates it as shown in figure 5.1, 5.2, 5.3. Figure 5.1.1: Estimation of crack width using different formulas compared with expt. Data for 20 mm cover. The crack width, wk, may be calculated as follows: wk = sr,max ⋅ ( εsm - εcm) (7.8) where: sr,max. Is the maximum crack spacing. Is the mean strain in the reinforcement under the relevant combination of loads, including the effect of imposed deformations and taking into account the effects of tension stiffening. Regarding the crack width calculations based on IRC: 112-2011 the reinforcement requirement is coming very high i.e almost twice to thrice than the required reinforcement for ultimate limit state. The Formula given for the crack width (Wk) is =Srmax (Esm - Ecm), but if we use Srmax the calculated crack width is exceeding the limiting value, to.
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