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12 mm bars 18 bars 18 diameters 20 mm bars 20 mm dia 30 mm cover 600 DISTANCE 750 Specimen area of concrete Area of steel bar diameter bars 20 Beeby calculated values CEB equation Cement and Concrete Concrete Association Concrete stress crack formed crack widths measured cracking load Demec direct tension DISTANCE ACROSS SPECIMEN DISTANCE TO BAR Distance to edge Fixed bar size Fixed bar spacing Haqqi equation hence percentage Group hydraulic jacks mean crack width MEAN STRAIN Figure mean values mean width Measured and calculated MEASURED SPACING measured values overestimates the crack plotted predicted values pure tension reinforcing bar shown in Figure significant difference slab spacing Group specimens in Group specimens tested steel stress 380 stress level subjected to direct surface tensile strength tensile stress tension stiffening effect test specimens transverse links uncracked underestimate the crack Variation in crack varying bar Wexham widths for specimens