Question

Reinforced Concrete Design Example 1: Using the ACI-Code approximate structural analysis, design for a warehouse, a continuous one-way solid slab supported on beams 4.0 m apart as shown in Figure. Assume that the beam webs are 30 cm wide. The dead load is 3 kN/m² in addition to the own weight of the slab, and the live load is 3 kN/m². Use fcº=28MPa, fy= 420MPa 8.0 m 4.0 m 4.0 m 4.0 m

RENFORCEMENT CONCRETE DESIGN (ACI-Code 2019).

Answer 1

A) Given be =am D.L-3 kn Im? L.L = 3 kalm? fc = 28 MPa fy = 420 MPa width of web = 0.som 1) 5 elect Im wide slab strip > Thickness of slab l 24 hmin 4000 24 - 166.66 ~ 170 mm clear span 4-0.30 - 3.70m 2) Loading! self wt. of slab = 25 kNlim xo.11 = 4.25 kalm2 Wu = 1.2D. L + 1,6 L. L - 12(4.25 + 3) + 1.6x3 cou = 13.50 kNlm 2 3) Who? walan? 2 LA Colin B ant I * to last -la 17 w ln? Evaluate man factored bending moment in strip Moment coett. 1-Yra /A Volu :'16 Factured moment KN.m -7,7 13.20 18.5 -1680 11.60 Sample, at A, Mu= 2/2 x 13.50 +3.70² = 27.7 krom

AS check for shear Ettective deplh =d: 0.17-0.020 -0.006 = 144 m ha Yumar a 1.15 Wiln 1.15 x13.5x3.70 - 29.70 KM ove = omsx (d) x fc 6 x boxd -0.5x1 6 x 198 x1000x144 : 95247 m DVc = 95.25 km > Vuman= 28.70 kn, Hence ok. s) Reinforcement for flenuse and shrinkage s (-) 0.85 fol 2.3x Myl fy o fc bar min. reinforcement , Ast min = 0.0018x 1000x170 = 306 mm² (m Reinforcement for fleruse = fx bad 16.80 factosed moment 7.7 13.20 18.50 1160 birimi Reinforcement ratio 0.0009 0.0016 0.0029 0.00207 0.0014 (8) Reinborcement (mm/m / 130 230 417.60 299 901,60 man, dein borcement 306 306 306 306 306 Bar size (mm) 10 10 To Bar spacing.com) 250 250 175 250 250

Bar spacing o Х reint. x 1000 = I x10? x 1000 = 250 mm 306 cic Shrinkage reint: 0.0018 8 10ooxin0 = 306 mm2fm Provide 0 10 bar @ 250 mm c/c 6) check for spacing per ACI Main reinforcement i) 30 = 3x 10 - 510 mm secondary reinforcement i) 5D=58170 = 850mm ii) 300mm ii) Asomm Hence Prorided spacing is Ок. 7) Reinforcement detailing $ 10-250 diotis 010-250 144 mm Momm 3.70 3.703- 4m 0.30m 0.30 0.30 0.30 m •Bar bent alternatively from flesuse reintorcement
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