# Civil Engineering - Theory of Structures - Discussion

Discussion Forum : Theory of Structures - Section 1 (Q.No. 2)
2.
The shape factor of standard rolled beam section varies from
1.10 to 1.20
1.20 to 1.30
1.30 to 1.40
1.40 to 1.50
Explanation:
No answer description is available. Let's discuss.
Discussion:
23 comments Page 2 of 3.

Asaithambi said:   6 years ago
Shape factor for square section = 1.5,
Rectangular section = 1.5.

I-section = 1.12 to 1.2.
Tube = 1.27.
Triangle = 2.346.

Gajan Rana said:   6 years ago
@Asaithambi.

Shape factor for Rectangular section = 1.5 & Circular section = 1.7.

M@hesh said:   6 years ago
Shape factor is the ratio of plastic moment to yield moment of a given section. It gives the reserve strength of the section after yielding.

Plastic moment is the capacity of any section derived using the plastic analysis i.e. assuming that the whole section have yielded and plastic state is reached.

Yield moment the capacity of the section assuming that only the outermost fiber is yielded.

Allen said:   6 years ago
Can show some exact formula to solve this?

Shuvanjan Dahal said:   6 years ago
Shape factor is the ratio of elastic to plastic moment capacity. Also, it is the ratio of elastic section modulus to plastic section modulus.

Asaithambi said:   7 years ago
What is the shape factor for a rectangular and a circular sections?

James lakshmann cpt said:   8 years ago
Shape factor is ratio between plastic and section modulus.

Emmanuel said:   8 years ago
Section modulus of rolled member as he said.

Vijay said:   9 years ago
Shape factor is ratio the of plastic section modulus(Zp) or section modulus( Ze)

Zp = A/2(y1+y2).
Ze = I/y.

Ariki said:   9 years ago
Shape factor triangular?