Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 2 (Q.No. 36)
36.
A simply supported wooden beam 150 cm long and having a cross section 16 cm x 24 cm carries a concentrated load, at the centre. If the permissible stress ft = 75 kg/cm2 and fs = 10 kg/cm2 the safe load is
Discussion:
19 comments Page 1 of 2.
Civi said:
5 years ago
@Pronay.
M- MOMENT OF INERTIA;
C- a distance of extreme fibre from the neutral axis (H/2)
but it for I section beam why they used it in rectangular? please explain me.
M- MOMENT OF INERTIA;
C- a distance of extreme fibre from the neutral axis (H/2)
but it for I section beam why they used it in rectangular? please explain me.
Anomi said:
5 years ago
Ft = tensile stress
Ft = M.C/I where i=bh3/12 = 18432.
75 = M. 12/18432.
M = 115200.
M = PL/4.
115200 = p 150/4.
P= 3072.
Answer is 3075,i.e Option C.
Ft = M.C/I where i=bh3/12 = 18432.
75 = M. 12/18432.
M = 115200.
M = PL/4.
115200 = p 150/4.
P= 3072.
Answer is 3075,i.e Option C.
(1)
BHASKAR said:
5 years ago
f/y = M/I.
M = fI/y.
M = 75*((16 * 24^3)/12) * (2/24).
M = 115200.
WL/4 = 115200.
W = (115200*4)/150.
W = 3072.
M = fI/y.
M = 75*((16 * 24^3)/12) * (2/24).
M = 115200.
WL/4 = 115200.
W = (115200*4)/150.
W = 3072.
(4)
Kailash said:
7 years ago
The answer should be 3050 because max permissible value is 372 then how this structure can withstand 375 load?
Dalisha said:
9 years ago
Take higher stress equal to M/z and M = wl/4; z=bd^2/6 which comes to be 3072 so near answer is 3075.
Praveen Balaji said:
8 years ago
Calculate Z and M = f x z..
After calculating M = 115200kgcm.
Then M =wl/4.
From this w= 3072kg.
After calculating M = 115200kgcm.
Then M =wl/4.
From this w= 3072kg.
Asha said:
4 years ago
Permissible stress should be lesser of two
Why did we take 75, it should be 10 right?
Why did we take 75, it should be 10 right?
Deepak said:
7 years ago
Permissible stress is 3075 but after applied fos 10, the safe load is 307.5 kg.
Sandeep said:
8 years ago
@Dalisha.
How to get the answer, can you explain, What is the value of w?
How to get the answer, can you explain, What is the value of w?
Abhik said:
6 years ago
@Kailash.
3071 is the correct answer. Then how it will be 3050?
3071 is the correct answer. Then how it will be 3050?
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