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7/27/2019 Design of STRIP Foundation
1/21
Load calculation for Foundation
Dead Loads
Roof Slab (El- 28.875 m)
Weight of roof slab = 0.125x24 = 3.0 kN/m2
slab thk=125mm
Area of Slab = 3.95x9.35 = 36.93 m2
total load = 3.0x36.93 = 110.8 kN
Water (El- 25.45 m)
Weight of Water = 10x3.675 = 36.75 kN/m2
Area of Slab = 3.95x9.35 = 36.93 m2
total load = 36.75x36.93 = 1537.2 kN
Beams (El- 25.45 m)
Total length of beams = 3.95x3+9.35x2 = 30.6 m
Thk of beams = 0.55 m
Width of beams = 0.35 m
weight of beams = 24x.55x.35x30.6= 141kN
Concrete Walls (El- 25.45 m)
Height of concrete walls = 3.675 m
T Length of concrete walls = 26.6 m
Width of concrete walls = 0.225 m
Weight of concrete walls = 24x.225x3.675x26.6=528 kN
for Proposed Housing Scheme,LVPS-Phase II
Design of Rectanguler elevated water tank foundation
Dam Safety
Environmental
Doc. No.
Civil Structure Maintanance
Reference Calculation
Ceylon Electriity Board
DateDesigned
Job Code
Checked
Output
Page
Date
7/27/2019 Design of STRIP Foundation
2/21
Slab (El- 25.45 m)
Weight of slab = 0.250x24 = 6.0 kN/m2
slab thk=250mm
Area of Slab = 3.95x9.35 = 36.93 m2
Total load = 6.0x36.93 = 221.6 kN
Beams (El- 21.05 m)
Total length of beams = 3.95x3+9.35x2 = 30.6 mThk of beams = 0.4 m
Width of beams = 0.35 m
weight of beams = 24x.4x.35x30.6= 103 kN
Columns (El- 21.05 m)
Total length of Columns = 4.15x6 = 24.9 m
Bredth of columns = 0.35 m
Width of columns = 0.35 m
weight of columns = 24x.35x.35x24.9 = 73.2 kN
Slab (El- 21.05 m)
Weight of slab = 0.125x24 = 3.0 kN/m2slab thk=125mm
Area of Slab = 4.675x3.95 = 18.5 m2
Total load = 3.0x18.5 = 55.5 kN
Beams (El- 21.05 m to 0.3 m )
Total length of beams = 3.95x3+9.35x2 = 30.6 m
Depth of beams = 0.35 m
Width of beams = 0.35 m
weight of beams = 24x.35x.35x30.6= 90 kN
No of floors = 5 nos
Total weight of Beams = 90x5 = 450 kN
Columns (El- 21.05 m to 0.3 m )
Total length of Columns = 4.15x6 = 24.9 m
Bredth of columns = 0.35 m
Width of columns = 0.35 m
weight of columns = 24x.35x.35x24.9 = 73.2 kN
No of floors = 5 nos
Total weight of columns = 73.2x5 = 366 kN
Weight of flatforms
Area of a flatform = 1.0x1.0 = 1.0 m2Thickness of a flatform = 0.125 m
weight of a flatform = 24x.125x1.0 = 3.0 kN
No of flatform = 6 nos
Total weight = 6x3 = 18 kN
Civil Structure Maintanance Job Code
DateEnvironmental Checked
Page
DateDam Safety
OutputReference Calculation
Doc. No.
Designed
Ceylon Electriity Board
7/27/2019 Design of STRIP Foundation
3/21
Weight of Ladders
Weight of a ladder = 77x.05x.006x16x4.15 = 1.5 kN
No of ladders = 6 nos
Total weight = 6x1.5 = 9.0 kN
Act on 3 columns
Live Loads
Roof Slabs & Flatform Slab (El- 28.875 m , E1-21.05 m)Live load on roof slab = 1.5 kN/m2
Live load on flatform slab = 2.5 kN/m3
Area of Slab = 3.95x9.35 + 36.93 m2
Area of flatfor slab = 5.02x4.3 = 21.61 m2
Total load = 1.5x36.93+2.5x21.61
= 109.5 kN
Wind Loads
Wind zone is 3
Basic wind speed of zone ,V = 38 m/s
structure is considered as a post disaster structure
Design wind speed Vs = VxS1xS2xS3
S1 =S2 =
Height of the structure is < 30m
S3 =
Dynamic pressure of the wind = k. Vs
(q) = 0.613x Vs
q = 0.613x1.03x38 = 0.911kN/m2
wind is normal to the longer dimention
b/d = 9.35/3.95 =
l/w > 2
H/b = 29/9.35 = 3.1
force coeficient, Cf =
wind force normal to the longer dimention
Effective front area , Ae = 9.7x3.675= 35.65 m2
The total wind load , F = Cf.q.Ae
= 1.2x.911x35.65
= 39 kN
wind is normal to the lesser dimention
d/b = 3.95/9.35 =
l/w > 2force coeficient, Cf =
wind force normal to the shorter dimention
Effective front area , Ae = 4.3x3.675= 15.8 m2
The total wind load , F = Cf.q.Ae
= 0.8x.911x15.8
= 11.52 kN
1.2
2.37
1.01.03
1.00
Reference Calculation Output
Civil Structure Maintanance Job Code Page
Designed
Ceylon Electriity Board
Dam Safety
Doc. No.
Date
Environmental Checked Date
0.42
0.8
7/27/2019 Design of STRIP Foundation
4/21
Total Loads
Dead Loads at EL-28.875 m = 110.8 kN
(roof slab)
Dead Loads at EL-25.45 m = 1537+141+528+222
( water+beams+concreet wall = 2428 kN
+ slab )
Dead Loads at EL-21.05 m = 103+73.2+55.5
( beams+columns+slab) = 232 kN
Dead Loads from = 450+366
EL-21.05 to 0.3 m = 816 kN
(beams+columns)
Weight of flatforms = 18 kN
Weight of ladders = 9.0 kN
Total Dead Load on Columns = 3614 kN
Total Live Load on Columns = 109.5 kN
Wind Load on long wall = 39 kN
Wind Load on short wall = 12 kN
Calculation of Loads on a middle column
Dead Loads
Roof Slab (El- 28.875 m)
Total load = 111 kN
Weight on middle column = 111 /4 = 28 kN
Water (El- 25.45 m)
Total load = 1537.2 /4 = 384 kN
Beams
Total weight of Beams = 141+103+450 = 694 kN
Weight on middle column = 0.22x694 = 153 kN
Weight from slab at EL 25.45 m
Total Weight = 221.6 kN
Weight on middle column = 221.6 /4 =55.4 kN
Columns
Weight of a column = 73.2 kN
Concrete Walls (El- 25.45 m)
Weight of all concrete walls = 24x.225x3.675x26.6=528 kN
Weight of concrete wall = 528/26.6x4.675= 93 kN
Weight from slab at EL 21.05 m
Total Weight = 65 kN
Weight on middle column = 65 /4 =17 kN
Civil Structure Maintanance Job Code
Environmental
Page
Dam Safety
Date
Reference Calculation Output
Ceylon Electriity Board Doc. No.
Designed Date
Checked
7/27/2019 Design of STRIP Foundation
5/21
Load from flatform+Ladders
= (18+9)/6 = 4.5 kN
Dead Load on middle column = 28+384+153+55.4+73.2+
93+17+4.5
= 808 kN
Dead Load on Edge Collumn = (3614-808x2) /4
= 500 kN
Live Load on middle column = 109.5 /4
= 28 kN
Live Load on Edge Collumn = 55.51/4 +54/8
max = 21 kN
Designed
Output
Ceylon Electriity Board Doc. No.
Dam Safety
Reference Calculation
Date
Environmental Checked Date
Civil Structure Maintanance Job Code Page
7/27/2019 Design of STRIP Foundation
6/21
Reference Calculation Output
Ceylon Electriity Board Doc. No.
Dam Safety
Date
Designed Date
Environmental Checked
Civil Structure Maintanance Job Code Page
7/27/2019 Design of STRIP Foundation
7/21
Reference Calculation Output
Ceylon Electriity Board Doc. No.
Dam Safety
Checked Date
Civil Structure Maintanance Job Code Page
Designed Date
Environmental
7/27/2019 Design of STRIP Foundation
8/21
Civil Structure Maintanance Job Code Page
Date
Environmental Checked Date
Ceylon Electriity Board Doc. No.
Dam Safety Designed
Reference Calculation Output
7/27/2019 Design of STRIP Foundation
9/21
Civil Structure Maintanance Job Code Page
Designed Date
Environmental Checked Date
Ceylon Electriity Board Doc. No.
Dam Safety
Reference Calculation Output
7/27/2019 Design of STRIP Foundation
10/21
Characteristic axial load on Column = kN
Characteristic Bending Moment on Column = kN
Characteristic Concrete Strength = kN
Allowable Ground Bearing Pressure = kN
Column Dimension
Bredth = mm
Width = mm
Footing Dimention
Length D = mm
Width B = mmHight h = mm
Characteristic Design Axial load = kN
Characteristic Design Bending Moment = kN.m
The equivalent eccentricity e = M/N
= mm
D/6 = 0.95d = mm
So z = mm x = (d-z)/0.45
= mm
As = M/(0.87.fy.Z) As =
= mm x/d = 0.95d = mm
194
104
6.37
0.007
192.53 184.3
780.0
804.0
250 50 6
55.9
434.33 0.060
780 434
932
153.9
0.024
906.86 885.4
885.4
780.0
804.0
1000 50 10 8
924.58 885.4
885.4
16.5
435.74 0.018
7/27/2019 Design of STRIP Foundation
20/21
Reference Calculation Output
Checked S.M.P. Date 03.06.2013
Civil Structure Maintanance Branch Job Code Page 1
Ceylon Electricity Board Doc. No. ..
Dam Safety, Designed S.M.P. Date 03.06.2013
Environmental &
z = mm x = (d-z)/0.45
= mm
As= M/(0.87.fy.Z)
= mm2 x/d = = mm2 > mm2 As =
mm2
at support
As provided
Shear resistance of the T beam = mm2
T12 @
250 mm
Cl 3.4.5. Maximum Shear force at point = kN
Maximum Shear force at the faceof column E = - x col face dimensi
= kN similler to
web dimension
Table 3.8 100As/bd = 100x
x
=
Check for Shear
V = KN d = mm
v = V/bd As prov = mm2
= N/mm2
100As/bd = 400/d =
vc = 0.79 {100As/bd}1/3 {400/d}1/4 {1/m} {35/25}1/3
vc = N/mm2 >
0.5 xVc = N/mm2
Nominal links should be provided
Assume two legs of T10 links
Asv = mm2
R10 @
Sv < Asv.0.87fy./(0.4bv) 250 mm
< 0.75d =
Shear resistance of the FlangeConsider shear at the face of rib
Check for Shear
V = KN d = mm
v = V/bd As prov = mm2
= N/mm2 < 0.8(fu)0.5 = N/mm2452.0
0.1876 4.0
0.1889
157
284.56 699
36 194
932
804.0
0.1783
0.2876 0.43
0.3777 0.1783
166.2
804.0
300 932
0.2876
166
375
452.0
181.8
181.8 104 0.15
184.3
3.3
86.4 0.017
375 86
q1 KN/m
(w2-w1)/2
7/27/2019 Design of STRIP Foundation
21/21
Reference Calculation Output
Checked S.M.P. Date 03.06.2013
Civil Structure Maintanance Branch Job Code Page 1
Ceylon Electricity Board Doc. No. ..
Dam Safety, Designed S.M.P. Date 03.06.2013
Environmental &
Table 3.8 Critical Shear stress
100As/bd = 400/d =
vc = 0.79 {100As/bd}1/3 {400/d}1/4 {1/m}
vc = N/mm2 >
0.5 xVc = N/mm2
Shear RF is not needed
0.233
0.233 2.06
0.466 0.1876
Recommended