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Determines the primary "pull" or shear stress on the section. sigma sub c t comma m a x end-sub Max tensile stress If this exceeds the concrete's tensile strength ( f sub c t comma e f f end-sub ), cracks are calculated. Inner lever arm Distance between compression and tension chords. cap A sub s l end-sub Tensile reinforcement area Essential for limiting the width of the "pull" effect. Report Warnings & Errors Nemetschek Scia Engineer V Crack Pull