Slab Design Sheet

Sr. Remark Sr.

1 Concrete Grade 15.00 Mpa 18 lx * lx 9.00
2 Renforcing Steel Grade 415.00 Mpa 19 (Ly / Lx)2 4.00
3 Shorter Span Lx 3.00 m 20 (Ly / Lx)4 16.00
4 Longer Span Ly 6.00 m Two Way Slab 21 By 0.03 moment coefficients
5 Live Load Considered 1.00 kN/m2 22 Bx 0.12 moment coefficients
6 Floor Finish Considered 1.00 kN/m2 23 Dead Load 2.88 kN/m2
7 Steel Assumed 0.3350 % 24 Total Load w 4.88 kN/m2
8 Overall Depth Reqd. 100.00 mm 25 Effective d Provided 96.00 mm
9 Overall Depth Provided 115.00 mm OK 26 w lx lx 43.88
10 Provided Bar Diameter 8.00 mm 27 Ultimate Moment Mux 7.74 kN.m
11 Reqd. Spacing along X 205.00 mm c/c 28 Ultimate Moment Muy 1.94 kN.m
12 Reqd. Spacing along Y 360.00 mm c/c 29 Depth Reqd. for Flexure 61.16 mm
13 Steel Provided 0.2132 % OK 30 Ast in X dir 240.11 mm2
14 Ly / Lx 2.00 31 Ast in Y dir 62.17 mm2
15 Modification Factor 1.43 32 Area of bar 50.27 mm2
16 L/d Ratio suggested 26.00 33 Min Ast 138.00 mm2
17 Modified L/d Ratio 37.18 34 L/D Ratio provided 26.09

DESIGN OF SLAB ( S-1) AT 3.40M LEVEL

 Design of Beam
Beam No. TB6 39,60 STAAD OUT PUT
Load Combination 0.9DL+1.5EQZ)
M 25 Mpa -Mu 241 kN.m Negative Bending Moment
Fe 415 Mpa +Mu 163.77 kN.m Positive Bending Moment
B = Breadth of beam 730 mm Vu 125.11 kN
D = Overall Depth 750 mm top steel dia 20 mm
cover 40 mm bottom steel di 20 mm
d' = top cover 40 mm stirrup dia. 8 mm
d 710 mm
d'/d 0.05
fsc 355 Mpa
Maximum Moment 241.002 kN.m
Moment of Resistance 1269 kN.m Singly Reinforced Beam
Refer page no. 87, Table 51, of SP-16 for Doubly Reinforced Beams
Refer page no. 49, Table 3 of SP-16 for Singly Reinforced Beams
Design For Negative Moment over support
Design BM 241.002 kN.m
-Mu / B d d 0.65491
pt 0.18734 %
pc 0 %
Ast = pt x B x d x 100 971 mm2 Tension Steel
Asc = pc x B x d x 100 0 mm2 Compression Steel
Steel At Top (MAIN) 971 mm2 20 mm 3.091 Nos.
Provide Steel At Top over contineous supports (MA 4-20#
Steel At Bottom 0 mm2 20 mm 0 Nos.

Design for Positive Moment

Design BM 163.77 kN.m
+Mu / B d d 0.44504
pt 0.12599 %
pc 0 %
Balance moment 0 kN.m
Ast1 653 mm2
Ast2 0 mm2
Ast = pt x B x d x 100 653 mm2 Tension Steel
Asc = pc x B x d x 100 0 mm2 Compression Steel
Steel At Bottom (MAIN) 653 mm2 20 mm 2.079 Nos.
Provide Steel At bottom (MAIN) 20 mm 4 Nos.
Steel At Top 0 mm2 20 mm 0 Nos.

Design For Shear

% steel (Ast) 0.187
Design Shear Strength 0.32 Mpa Page 178, Table 61, SP-16
Maximum Allowable shear stress 3.1 Mpa Page 175, Table J, SP-16
Shear Stress = Shear Force / B x 0.25 SAFE
Shear Strength of Concrete 165.5 kN
Design Shear Force 0 kN
Asv 100.5 mm2 Area of shear stirrups
Nominal Stirrupe Spacing 100 mm c/c
OR 0.75 x d 532.5 mm c/c
Design Stirrupe Spacing 100 mm c/c Strirrup Dia 8 mm
Provide Spacing 100 mm c/c Page 175, Clause 4.3, SP-16
 Design of Beam
Beam No. TB1 34 STAAD OUT PUT
Load Combination 1.5(DL+EQX )
M 30 Mpa -Mu 353.02 kN.m Negative Bending Moment
Fe 500 Mpa +Mu 121.78 kN.m Positive Bending Moment
B = Breadth of beam 750 mm Vu 302.98 kN
D = Overall Depth 750 mm top steel dia 20 mm
cover 40 mm bottom steel di 20 mm
d' = top cover 40 mm stirrup dia. 8 mm
d 710 mm
d'/d 0.05
fsc 355 Mpa
Maximum Moment 353.02 kN.m
Moment of Resistance 1565 kN.m Singly Reinforced Beam
Refer page no. 87, Table 51, of SP-16 for Doubly Reinforced Beams
Refer page no. 49, Table 3 of SP-16 for Singly Reinforced Beams
Design For Negative Moment
Design BM 353.02 kN.m
-Mu / B d d 0.93373
pt 0.26892 %
pc 0 %
Balance moment 0 kN.m
Ast1 1432 mm2
Ast2 0 mm2
Ast = pt x B x d x 100 1432 mm2 Tension Steel
Asc = pc x B x d x 100 0 mm2 Compression Steel
Steel At Top (MAIN) 1432 mm2 20 mm 3.874 Nos.
Provide Steel At Top (MAIN) 20 mm 4 Nos.
Steel At Bottom 0 mm2 20 mm 0 Nos.
-Mu 353.02
+Mu 121.783
Maximum Moment 353.02
Vu

Capacity of beam 1565 kN.m Singly Reinforced Beam

Design for Positive Moment
Design BM 121.783 kN.m
+Mu / B d d 0.32211
pt 0.09052 %
pc 0 %
Balance moment 0 kN.m
Ast1 482 mm2
Ast2 0 mm2
Ast = pt x B x d x 100 482 mm2 Tension Steel
Asc = pc x B x d x 100 0 mm2 Compression Steel
Steel At Bottom (MAIN) 482 mm2 20 mm 1.534 Nos.
Provide Steel At bottom (MAIN) 20 mm 4 Nos.
Steel At Top 0 mm2 20 mm 0 Nos.

Design For Shear

% steel (Ast) 0.268
Design Shear Strength 0.38 Mpa Page 178, Table 61, SP-16
Maximum Allowable shear stress 3.1 Mpa Page 175, Table J, SP-16
Shear Stress = Shear Force / B x 0.575 SAFE
beta 12.95
Shear Strength of Concrete 202 kN
Design Shear Force 100.98 kN
Asv 100.5 mm2 Area of shear stirrups
Nominal Stirrupe Spacing 125 mm c/c
OR 0.75 x d 532.5 mm c/c
Design Stirrupe Spacing 305 mm c/c Strirrup Dia 8 mm
Provide Spacing 100 mm c/c Page 175, Clause 4.3, SP-16