Notes

Design Code, EC2 BS8110 CP65   N/mm2    

Concrete strength;
during demoulding, fck_cube 15 10 15 20 25 30 35 40 45 50   N/mm2     installations stage, fck_{cube_install} 40 25 30 35 40 45 50   N/mm2     service stage, fck_service C35/45 C20/25 C25/30 C30/37 C35/45 C40/50 C45/55 C50/60   N/mm2    

main span rebar , 500 485 500   N/mm2     steel 'C' links, 500 250 460 500   N/mm2     cover, 25 20 25 30 35 40 45 50   mm    

prefered main reinforcements size, 10 6 8 10 12 13 16 20 25   mm    

Design width, b = 1000   mm    

h_stair= m (meter)     Lspan= m (meter)     Stair waist, h_waist= 150 100 110 115 120 125 130 140 145 150 165 175 180 190 200 215 225 230 245 250 260 265 270 275 280 290 300 310 315 325 340 350   mm    

Going= 250 175 190 195 200 205 210 215 225 230 240 250 255 260 265 270 275 280 290 295 300 305 310 315 320 325   mm     Riser= 175 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230   mm    

h_top (nib/corbel)= 100 75 80 85 90 95 100 105 110 115 120 125 130 140 150 160 180 200 225 250   mm     Ltop= 200 100 125 150 175 200 225 250 275 300   mm     h_top , h_bottom (nib/corbel) reinforcement , 500 460 500 250   N/mm2    

h_bottom (nib/corbel) = 100 75 80 85 90 95 100 105 110 115 120 125 130 140 150 160 180 200 225 250   mm     Lbott= 200 100 125 150 175 200 225 250 275 300   mm     prefered nib/corbel reinforcements size, 10 6 8 10 12 13 16 20 25   mm    

Live Loads, LL (service) = 4.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0   kN/m2    

Live Loads, LL (construction) = 3.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0   kN/m2     sdL= 1.2 0.0 0.25 0.5 0.75 1.0 1.2 1.25 1.5 1.75 2.0 2.25 2.5 2.75 3.0   kN/m2