rohtak1 opt 2

2
a esgn : Slabs are designed as per Appendix-C of I.S.456-1978 Mx = ax * w * lx 2 My = ay * w * lx 2 Where: Mx = M oment on strip of unit width spanning l x My = M oment on strip of unit width spanning l y w = Total design load per unit area ax, ay = Coefficient given in Appendix-C of I.S.456-1978 depending upon Edge Conditions and Aspect Ratio lx = Effective Span in X direction ly = Effective Span in Y direction Lx = Clear Span in X direction Ly = Clear Span in Y direction lx = Lesser of (Lx + Effective Depth ) & Centre to Centre of Support ly = Lesser of (Ly + Effective Depth ) & Centre to Centre of Support Slab Reinforcement Curtailment Negative Reinforcement at C ontinuous Edge = 0.30 l from edge o f suppor t Negative Re inforcement at Discontinuous Ed ge = 0.15 l from edge of support Concrete Grade in N/mm 2  (sck) = 15 Steel Gradein N/mm 2  (sy) = 415 Most Critical Slab S.No. Edge Condition Total Depth (m) Lx (m) Ly (m) ly/lx Load (T/m 2 ) 1 0.150 4.750 5.060 D.L. 0.550  ax(-)ve 0.0352 Mux(-v e) 1.004 Ast x(-ve) 2.32 Tor 8 @ 216 Tor 10 @ 338 Tor 12 @ 486 1 Interior Panel  ax(+)ve 0.0265 Mux(+ve) 0.757 Astx(+ve) 1.73 Tor 8 @ 290 Tor 10 @ 454 Tor 12 @ 654 Eff. Depth (m) lx (m) ly (m) L.L. 0.250  ay(-)ve 0. 03 20 Mu y( -ve) 0. 913 Asty (- ve ) 2. 10 Tor 8 @ 239 Tor 10 @ 373 Tor 12 @ 538 Drawing Room 0.126 4.876 5.186 1.064 Total 0.800  ay(+)ve 0.0240 Muy(+ve) 0.685 Ast y(+ve) 1.56 Tor 8 @ 323 Tor 10 @ 504 Tor 12 @ 726 Required Tor 8 @ 216 ( in Shor t sp an) and Tor 8 @ 323  (Long span). Moment Coef ficients Factor ed Moments (Tm) Steel Area (cm 2  /m) Bar Description

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Page 1: Rohtak1 Opt 2

8/17/2019 Rohtak1 Opt 2

http://slidepdf.com/reader/full/rohtak1-opt-2 1/1

a es g n:

Slabs are designed as per Appendix-C of I.S.456-1978

Mx = ax * w * lx2

My = ay * w * lx2

Where:

Mx  = Moment on strip of unit width spanning lx

My  = Moment on strip of unit width spanning ly

w = Total design load per unit area

ax,ay = Coefficient given in Appendix-C of I.S.456-1978

depending upon Edge Conditions and Aspect Ratio

lx = Effective Span in X direction

ly = Effective Span in Y direction

Lx = Clear Span in X direction

Ly = Clear Span in Y direction

lx = Lesser of (Lx + Effective Depth ) & Centre to Centre of Support

ly = Lesser of (Ly + Effective Depth ) & Centre to Centre of Support

Slab Reinforcement Curtailment

Negative Reinforcement at Continuous Edge = 0.30 l from edge of support

Negative Reinforcement at Discontinuous Edge = 0.15 l from edge of support

Concrete Grade in N/mm2 (sck) = 15

Steel Gradein N/mm2 (sy) = 415

Most Critical Slab

S.No. Edge Condition Total Depth (m) Lx (m) Ly (m) ly/lx Load (T/m2)

1 0.150 4.750 5.060 D.L. 0.550   ax(-)ve 0.0352 Mux(- ve) 1.004 As tx(-ve) 2.32 Tor 8 @ 216 Tor 10 @ 338 Tor 12 @ 486

1 Interior Panel   ax(+)ve 0.0265 Mux(+ve) 0.757 Astx(+ve) 1.73 Tor 8 @ 290 Tor 10 @ 454 Tor 12 @ 654

Eff. Depth (m) lx (m) ly (m) L.L. 0.250   ay(-)ve 0 .0 32 0 M uy (- ve ) 0 .9 13 Asty( -ve) 2 .1 0 Tor 8 @ 239 Tor 10 @ 373 Tor 12 @ 538

Drawing Room 0.126 4.876 5.186 1.064 Total 0.800   ay(+)ve 0.0240 Muy(+ve) 0.685 As ty(+ve) 1.56 Tor 8 @ 323 Tor 10 @ 504 Tor 12 @ 726

Required Tor 8 @ 216 ( in Short span) and Tor 8 @ 323  (Long span).

Moment Coefficients Factored Moments (Tm) Steel Area (cm2 /m) Bar Description