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Flat Slab Design 4.35m x 4.35m
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Flat Slab Design 4.35m x 4.35m
Flat slab designFull description...
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laurenjia
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Design of Flat Slab
A) LOADINGS Concrete Density Sla t!ickness #anel Dro% %anel
= = = =
24.00 kN/m3 0.2" m $ 4.3" $ &."0
4 .3 " & ." 0
Dea' Loa' (t o sla (t o 'ro% ,otal ,otal
= = =
&&3.*4 kN +.&0 kN &2&.+4 kN
,otal ,otal
= =
2".00 kN/m2 4*3.3 kN
=
"".*+ kN
Li-e Loa'
,otal ,otal nactore' loa'
,!ereore ltimate loa' on t!e 1oor = an' ei-alent 'istrite' loa' n =
2+.+* kN %er %anel
4.00 kN/m2
B) ANALYSIS
5ecti-e s%an L = 3 .3 " m Dro% %anel6s 'imension 7 &/3 %anel 'imension. ,!ereore colmn stri% = (i't! o 'ro% %anel = &."0 m a) Centre of interior span
#ositi-e moment
=
22&.20 kNm
8i't! o mi''le stri%
= 7
2.+" m &/2 %anel 'imension
,!ereore %ro%ortion o moment taken taken y mi''le stri% = 0." ,!s t!e mi''le stri% %ositi-e moment = &30.4 kNm ,!e colmn stri% %ositi-e moment = 0.*0 kNm '
=
220.00
c
=
y
=
i) Middle strip 9
=
<0.2" ? 9/0.)@0." ; As
ii) Column strip 9
= =
=
0.4: 0.4" 20.00
=
&":0.&4 mm2 <&4,&2 200mm)
=
0.04
<0.2" ? 9/0.)@0." ; As
0.03
= =
= =
=
0.4" 0.4" 20.00
&0+4.43 mm2 <&0,&2 &+*." mm)
b) Interior Support
Ne>ati-e moment
= =
?0.0""L ?&*&.3" kNm
an' t!is is also 'i-i'e' to #ro%ortion taken y mi''le stri%
= = =
#ro%ortion taken y colmn stri% or t!e mi''le stri% 9 = <0.2" ? 9/0.)@0." ; As
0.04 = =
=
20.00
= :*&.42 mm2 <:,&2 "*0 mm)
or t!e colmn stri% ' = 9 = <0.2" ? 9/0.)@0." ; As
c) Punching Shear 1) At the column head:
0.4: 0.4"
= =
3:".00 0.03 = =
0.4* 0.4" 34:.*"
+30.0 mm2 <+,&2 200mm)
0.33 ?":.&: ?&&".&
'iameter o colmn !ea' %erimeter = =
= *00.00 mm $ 'iameter o colmn !ea' 2&.&& mm
S!ear orce B
= ? /4<'iameter o colmn !ea')@2n = &0.02 kN ,o allo( or t!e e5ects o moment transer B is increase' y &" t!s = &.&"B/' &.30 N/mm2 = 2) irst critical %erimeter is &."' t!s t!e len>t! o %erimeter Fltimate s!ear orce t!s s!ear stress -
0.+ c
=
= = = = = =
"4*."0 mm 4
= As
=
&00As/'
=
-c
=
4.3+
&"+2.00 mm
0.2 0.*<&00As/')@&/3<400 0.43 N/mm
= - -c t!ereore t!e section is a'eate in %nc!in> 3) At t!e 'ro%%e' %anel critical section is
= = =
an' %erimeter Calclate' s!ear B
= =
2
2
Dro%%e' %a 2.&: +:40.00
? 2 $ n *00.2* kN
t!s t!e s!ear stress -
0.42 N/mm
=
2
-c
t!s t!e section is a'eate. Span-Eective Depth Ratio
At t!e centre o s%an K/'2 Asre
=
0.4
=
&":0.&4 mm2
As%ro-
=
&"+2.00 mm2 2 2+3."3 N/mm
s
= ,!ereore mo'iHcation actor As sc! S%an L = e5ecti-e 'e%t! =
= 4.3" m 220.00 mm
&.42
limitin> s%an/e5ecti-e 'e%t! actal s%an/e5ecti-e 'e%t!
= =
3*.02 &.*
m $
0.&" m
<& no 2"0$2"0 C #ile)
30.00 N/mm2 4:0.00 N/mm2
&."0 m
kNm kNm
N/mm2 <rom t!e colmn ace) r E 2<&."')) ter E 2
/')@&/4/Jm
nel (i't! E 2 $ &." $ ' m sare mm
<,ale 3.&0 MS +&&0)
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