experiment sheet for compound pendulumFull description
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masonry
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COMPOUND INTEREST
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Full description
compound interest
Height of wall above ground Height of fencing (barbed wire) W idth of wall Length of wall Ground W all below ground Mass density of masonary Wind Data Basic W ind speed Terrain category Class of structure Design wind speed Vz
= = = =
= = = = =
3 0.6 0.345 1000 almost flat 0.15 20.8 47 1 C Vb.K1.K2.K3
Vb
=
47
K1
= =
Probability fa 0.9
K2
=
0.99
K3
=
1
V10
=
41.877
Design Wind Pressure (P Z)[5.4] 2
Pz
=
0.6 x (VZ)
P10
=
1052.20988
=
Cp Ae Pz
Wind Load Calculation
Wind force is given by F Choice of Cf [6.3.2.3 and Table 24] Here, b =1 =1 km(approx), h= 3 m, b/h >160 Since wall is on ground Cf
=
2
=
10
Force on Barbed Wire
Solidity ratio corresponding value of C f for single frame having flat sided members [Table 28]
Ae
1.9 =
0.1
=
199.919877
F= Cp Ae Pz F= Cp Ae Pz
Force on Wall F
=
Cp Ae Pz
=
2104.41975
Bending moment due to barbed wire and wall.
=
10633.1069
Total Shear at base
=
6.51317914
=
22.6044
= =
6M/bd 0.53601043
= =
P/A
Forces at Base
Calculation of stresses at base Total Weight of masonary at base Bending stress caused by vertical bending produced at base on extreme edge
Compressive stress due to weight at base
Maximum tensile stress at extreme fibre for vertical bending
2
0.06552
=
-0.4704904
=
h x Sqrt(480
= = = =
0.21011797 0.29854315 0.37905655 0.52201547
Check for tensile stress According to 5.2.3.2 of IS 1905:1980 ‘Code of practice for structural safety of buildings: Masonry walls (second revision)’, perm issible tensile stress f or freestanding vertical walls in vertical bending is 0.07 N/mm2. However, the tensile stress at base of wall at ground level amounts to 0.3 N/mm2, therefore, exceeds the permissible value. The base width of wall is to be increased for tensile stress design. The thickness of wall at various heights is given by: t Thus t at height 1m from top t at height 1.5m from top t at height 2m from top t at height 3m from top
m m m m m 3 KN/m m/s [5.3.2.2]
ctor[5.3.1 and table 1] (considering mean probable design life of wall as 25 years)
(terrain category 1 and class of structure C) that is, ground is almost flat
