Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 34)
34.
The deflection of any rectangular beam simply supported, is
Discussion:
45 comments Page 1 of 5.
VIPIN SAINATH said:
5 years ago
Option C &D is correct because Deflection is inversely proportional to Depth & Moment of Inertia. Deflection is directly proportional to Width and length. When we increase the width area Moment of Inertia reduces and Deflection may also be increased and In case of length, longer spans have high deflection ratio.
Niraj Adhikari said:
6 years ago
As we know pure bending formula,
M/I =E/R ( particular).
Where 1/R= deflection.
So deflection is proportion to bending moment and inversely proportion to flexural rigidity (EI) where I for rectangle section is bd^3/12.
Hence, deflection is inversely proportioned to with and also a cube of its depth.
M/I =E/R ( particular).
Where 1/R= deflection.
So deflection is proportion to bending moment and inversely proportion to flexural rigidity (EI) where I for rectangle section is bd^3/12.
Hence, deflection is inversely proportioned to with and also a cube of its depth.
Taba Tallum said:
2 months ago
Option A, B & C are correct in the case of a rectangular beam.
Deflection = 5wl4 ÷ 384EI for uploading,
= Wl^3÷48EI for point load etc.
Where I = bd^3/12.
Deflection is directly proportional to weight or load & length.
Deflection is inversely proportional to width and the cube of depth.
Deflection = 5wl4 ÷ 384EI for uploading,
= Wl^3÷48EI for point load etc.
Where I = bd^3/12.
Deflection is directly proportional to weight or load & length.
Deflection is inversely proportional to width and the cube of depth.
U.S.lakshmi said:
6 years ago
The deflection of the beam is directly proportional to (wl^3) and inversely proportional to EIso why is the option choose 'c' and actually option e is all the above I think there is some printing mistake done.
Zia-Ur-Rehman said:
6 years ago
In every equation for rectangular beam, there is a term variable/EI (I= bh^3/12) in the denominator, while the rest of variables change with loading conditions, therefore the given answer is correct.
(2)
Pradipto Sarkar said:
8 years ago
As per my knowledge, the answer will be (E)... because;
(a) not directly proportional to its weight but the load.
(b) I may be 1/12 db^3.
(c) same as (b).
(d) power of l changes with the load.
(a) not directly proportional to its weight but the load.
(b) I may be 1/12 db^3.
(c) same as (b).
(d) power of l changes with the load.
Ajay Desai said:
7 years ago
As per my knowledge, the answer will be (E). Because;
(a) not directly proportional to its weight but the load.
(b) I may be 1/12 db^3.
(c) same as (b).
(d) power of l changes with the load.
(a) not directly proportional to its weight but the load.
(b) I may be 1/12 db^3.
(c) same as (b).
(d) power of l changes with the load.
Mohit said:
4 years ago
D should be the correct answer, width and depth will change about the axis you are considering that is Ixx or Iyy but the length will be the same, so the answer should be option D.
(2)
Chanchal said:
7 years ago
Loading condition is not given. We can't determine the deflection of any particular case. So, the right answer should be none of these.
Rahim Sayyed said:
4 years ago
Between B &D, D is Power 3 therefore it's a major factor dominating the deflection compare to B. So, D should be the right one.
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