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dseign of staircase_m.tech-ii sem

1
Design of Staircase Data Rise= 0.15 Assume Thck of waist slab= 0.175 m Tread= 0.3 Span= 5 Load Calculations: 1 Self wt of slab= 4.891399 2 Live Load= 5 3 Floor Finish= 0.75 4 Wt of steps= 1.8 Total Load = 12.4414 18.6621 Bending Moment Calculation: 58.319056 kN-m check for Effective Depth: 58319056 d= 1000*3.45 d= 130.0157 mm <d assumed HENCE SLAB THCK.ASSUMED IS SAFE Therefore Provide D = 175 d = 155 Reinforcement: AstReqd = 0.5*20 1- 415 AstReqd = 1252.706 Astmin= 0.12%of gross section 210 Provide 12#@ 90mm c/c as main steel and 8# @200 mmc/c as distribution steel Astprovided = 1256 Check for Deflection: 0.810323 b*d Modification factor as per IS = 1.05 Allowable span / depth rati = 21 Actual span / depth ratio = 32.25806 kN/m 2 kN/m 2 kN/m 2 kN/m 2 kN/m 2 Factored Load (Wu kN/m 2 Max Bending Moment =(Wu)xL 2 /8: 1-(4.6*BM*10 6 ) 20*b*d 2 mm 2 mm 2 mm 2 Percentage of reinf. provided = 100 x Ast

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Excel file for design of staircase

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Sheet1Design of StaircaseDataRise=0.15Assume Thck of waist slab=0.175mTread=0.3Span=5Load Calculations:1Self wt of slab=4.8913987008kN/m22Live Load=5kN/m23Floor Finish=0.75kN/m24Wt of steps=1.8kN/m2Total Load =12.4413987008kN/m2Factored Load (Wu)18.6620980512kN/m2Bending Moment Calculation:Max Bending Moment =(Wu)xL2/8:58.3190564099kN-mcheck for Effective Depth:58319056.40991d=1000*3.45d=130.0156695238mm


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