Grameen Sampark Final April 0... - pmgsy

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Laboratory Test (Under Vertical Loading)
A set of tests have been carried out in laboratory to
ascertain the ability to sustain vertical load by a paper in
Grameen Sampark
terms of its own weight when folded to different ratios of
length and breadth of folds corresponding to different
heights. The results obtained are as under:
Test Height (H) Length of Breadth of Self weight Slenderness Length of Sustained Ratio of
No. (in mm) Fold (L) Fold (B) of the Paper Ratio Fold/ Breadth weight Load and
(in mm.) (in mm.) (in gms.) of Fold (L/B) (in gms.) Self weight
I 80 75 25.0 2.56 3.20 3.00 454.00 177.34
II 80 55 27.5 2.56 2.90 2.00 543.00 214.06
III 80 30 10.0 1.28 8.00 3.00 170.00 132.81
IV 66 63 42.0 1.60 1.57 1.50 410.00 256.25
V 143 63 42.0 3.33 3.40 1.50 356.67 107.11
VI 100 80 50.0 1.00 2.00 1.60 238.00 238.00
VII 45 75 20.0 4.00 2.25 3.75 1020.00 255.00
VIII 56 60 22.0 8.00 2.54 2.72 1987.00 248.38
IX 180 43 18.0 5.00 10.00 2.39 145.00 29.00
X 150 43 18.0 4.00 8.33 2.39 770.00 197.50
XI 120 43 18.0 4.00 6.67 2.39 947.00 236.75
XII 83 43 18.0 2.00 4.61 2.39 1800.00 750.00
It is found from the laboratory tests that when breadth of
fold (B) = 0.125 times of height (H) and the length of fold
(L) is thrice the breadth of fold the most economical
cross section of the folded plate wall would be adequate
to sustain vertical load upto hundred and thirty three
times (133) that of the self weight of the structure. Which
virtually means that a 3 m. long 250 mm. thick brick
wall of height 3 m., if folded in conformity to the above
parameters of fold, can take load of 580 tons (Self weight
4387 Kgs.). It can sustain load from approximately 800
m2 of roof area. which confirms that if materials of
higher crushing strength could be obtained by
improving quality of material used for folded wall, the
cost for quality improvement might bring much higher
cost benefit ratio.