Panel 4 .pdf
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Title: Structural Design Template (version 1).xlsb
Author: Edidiong Edet
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BS8110 REF
CALCULATIONS
OUTPUT
SLAB PANEL P4
2225 mm
3150 mm
TWO-WAY SPANNING SLAB
Longer span of slab
Shorter span of slab
Thickness of slab
Characteristic strength of concrete
Characteristic strength of steel
Density of concrete
Diamater of steel proposed
Table 3.3
Table 3.4
3.3 DURABILITY AND FIRE RESISTANCE
Nominal cover for mild conditions of exposure = 20mm
Max fire resistance of 150mm slab with 20mm
LOADING ON SLAB
2
410 N/mm
3
2400 kg/m
12 mm
cover = 1½hr > 1hr
Self weight of slab
Finishes
Partitions [minimum]
Characteristic dead load
Characteristic imposed load
3.2.1.2.2
3.15 m
2.23 m
150 mm
2
25 N/mm
3.6 KN/m
cover
Fire resistance OK
20 mm
2
1.2 KN/m2
1 KN/m
2
2
5.8 KN/m
3 KN/m2
12.92
Design load [1.4gk +1.6qk]
DESIGN MOMENTS AND REINFORCEMENTS
1.416
Aspect ratio of slab
SHORT SPAN [SUPPORT]
0.075
Support moment coefficient
4.773
Support moment
124
Effective depth of beam ,
[d]
M
0.0124
K
bd2 fcu
0.95
Lever arm, z,
117.80
M
Area of steel required,
As
0.95 f y z
KN/m2
gk
qk
n
2
5.8 KN/m
2
3 KN/m
2
12.92 KN/m
Table 3.14
Table 3.14
3.4.4.4
3.4.4.4
3.4.4.4
Minimum reinforcement area
SHORT SPAN [MIDSPAN]
Table 3.14
Table 3.14
Midspan moment coefficient
Midspan moment
Effective depth of beam ,
3.4.4.4
3.4.4.4
3.4.4.4
K
[d]
M
bd2 fcu
Lever arm, z,
Area of steel required,
As
KNm
mm
d
mm
104 mm2
0.056
3.558 KNm
124 mm
195 mm
Provide
Y 12 at 300
2
2
377 mm
0.0093
0.95 d
117.80 mm
M
0.95 f y z
78 mm2
Provide
Y 12
at 300
2
377 mm
BS8110 REF
CALCULATIONS
OUTPUT
LONG SPAN [SUPPORT]
0.045
Table 3.14
Support moment coefficient
2.878 KNm
Table
3.14
Support
moment
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Effective depth of beam ,
3.4.4.4
3.4.4.4
3.4.4.4
K
[d]
M
bd2 fcu
Lever arm, z,
As
Area of steel required,
112 mm
0.0092
0.95 d
106.40 mm
M
0.95 f y z
69 mm2
Provide
Y 12 at 300
377 mm
2
LONG SPAN [MIDSPAN]
Table 3.14
Table 3.14
Midspan moment coefficient
Midspan moment
Effective depth of beam ,
3.4.4.4
3.4.4.4
3.4.4.4
K
[d]
M
bd2 fcu
Lever arm, z,
Area of steel required,
As
0.034
2.175 KNm
112 mm
0.0069
0.95 d
106.40 mm
M
0.95 f y z
Provide
52 mm2
Y 12
at 300
mm
377
2
2
377 mm
BS8110 REF
CALCULATIONS
OUTPUT
DEFLECTION CHECK
Table 3.9
Basic minimum effective depth for short
span
Moment redistribution factor
Tension reinforcement area provided
Tension reinforcement area required
Design service stress
85.6 mm
1.0
fs
377 mm
78 mm2
2 f y Asreq
Table 3.10
Modification factor
3.12.11.2.7
Modified minimum effective depth
CRACKING
Cracking is controlled by limiting bar spacing.
Maximum spacing allowed for reinforcement
2
0.55
3Asprov
*
1
b
56.20 N/mm2
(477 fs )
2.0
M
120(0.9 2 )
bd
2.00
42.79 mm
372 mm
124 mm
OK
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OK


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