ABCDEFGHIJKLMNOPQRSTUVWXYZ
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DESIGN OF HOLLOW BLOCK SLAB :-
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SLAB ID :-
S-8 ( a-direction)
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1)- APPLIED LOADS :-
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 - Mu (+ive)=mt
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 - Mu (-ive)R=0,00mt
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 - Mu (-ive)L=0,00mt
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 - QuR=4,40t
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 - QuL=4,40t
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 - Wu =1,17t/m
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2)- PROPERTIES OF MATERIAL :-
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 - Fcu=250Kg/cm2
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 - Fy ( Steel)=3600Kg/cm2
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 - Fy ( Stirr.)=2400Kg/cm2
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3)- DIMENSIONS OF SLAB :-
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- Thickness of solid slab (ts) =
45cm
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- Total thickness of H.B.S (t) =
220cm
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- Width of rib (b)
=45cm
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4)- DESIGN OF T-SEC. AT M (+ive) :-
a=550,5408
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a)- ( 0.531 Fy2 / B.Fcu ) As2 - ( 0.9 Fy.d ) As + Mu = 0
b=-704700
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Ascal =0,00cm2c=0
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X1=1280,014124
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b)- Asb = b.d ( ( 4550 / 6300 + Fy ).Fcu / Fy + ( 0.85 Fcu ( B - b ) ts ) / ( b.d.Fy )
X2=0
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Asb =325,66cm2
Ascal < 0.5 Asb -- ( O.K )
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c)- Asmin1 = 9 / Fy ( b.d )
=24,47cm2
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Asmin2 = 1.33 Ascal.
=0,00cm2
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Asmin =0,00cm2
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Asfinal=0,00cm2
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Use218/Rib
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5)- DESIGN OF R-SEC. AT M (-ive)R :-
a=550,5408
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a)- ( 0.531 Fy2 / B.Fcu ) As2 - ( 0.9 Fy.d ) As + Mu = 0
b=-704700
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Ascal =0,00cm2c=0
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X1=1280,014124
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b)- Asb = B.d ( ( 4550 / 6300 + Fy ).Fcu / Fy
X2=0
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Asb =347,09cm2
Ascal < 0.5 Asb -- ( O.K )
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c)- Asmin1 = 9 / Fy ( B.d )
=27,19cm2
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Asmin2 = 1.33 Ascal.
=0,00cm2
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Asmin =0,00cm2
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Asfinal=0,00cm2
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Use212/Rib
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6)- DESIGN OF R-SEC. AT M (-ive)L :-
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a)- ( 0.531 Fy2 / B.Fcu ) As2 - ( 0.9 Fy.d ) As + Mu = 0
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Ascal =0,00cm2a=550,5408
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b=-704700
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b)- Asb = B.d ( ( 4550 / 6300 + Fy ).Fcu / Fy
c=0
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Asb =347,09cm2
Ascal < 0.5 Asb -- ( O.K )
X1=1280,014124
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X2=0
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c)- Asmin1 = 9 / Fy ( B.d )
=27,19cm2
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Asmin2 = 1.33 Ascal.
=0,00cm2
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Asmin =0,00cm2
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Asfinal=0,00cm2
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Use212/Rib
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7)- CHECK MR FOR RIGHT SIDE :-
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- MR = Rmax ( Fcu / gc ) b.d2 =
702,50mt/rib
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 - Mact=0,00mt/rib
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MR > Mact --- Use Min. Solid Part
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SR =30cma=0,585
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b=-4,40
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8)- CHECK MR FOR LEFT SIDE :-
c=-1404,995625
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- MR = Rmax ( Fcu / gc ) b.d2 =
702,50mt/ribX1=52,91192653
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 - Mact=0,00mt/ribX2=-45,39055901
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MR > Mact --- Use Min. Solid Part
S=-4539,055901
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SL =30cmS=-4539
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a=0,585
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9)- CHECK SHEAR ON RIBS FROM RIGHT SIDE :-
b=-4,40
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- qcu = 0.73 Fcu =
11,54Kg/cm2c=-1404,995625
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- qumax = 2.04 Fcu =
32,26Kg/cm2X1=52,91192653
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- Quact / Rib = ( QuR - Wu . SR ) / 2 =
2,02tX2=-45,39055901
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- qu = ( Qu / 0.85 ( b.d + B.ts ) ) =
0,24Kg/cm2S=-4539,055901
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qu < qcu --- Use Solid Part as calculated above
S=-4539
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SR =30cm
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10)- CHECK SHEAR ON RIBS FROM LEFT SIDE :-
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- Quact / Rib = ( QuL - Wu . SL ) / 2 =
2,02t
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- qu = ( Qu / 0.85 ( b.d + B.ts ) ) =
0,24Kg/cm2
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qu < qcu --- Use Solid Part as calculated above
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SL=30cm
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