# 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 1 of 3.

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.

Sunny Kumar said:   3 years ago
Rectangle/ square - 1.5
Triangle with vertex upward -2.34 (best section)
Triangle with vertex horizontal - 2
Solid circular section - 1.7
Thing ring - 1.27
Diamond section (Rhombus) - 2
Thin hollow Rhombus - 1.5
I section ( about strong axis) - 1.12 to 1.15
I section ( about week axis ) - 1.55
T- section - 1.9 to 1.95
(2)

MKS said:   4 years ago
The ratio of the plastic moment to the yield moment is known as the shape factor. For a rectangular section the plastic moment Mp is about 1.5 times greater than the elastic moment capacity. For an I-section the value of the shape factor is about 1.12.

Deepak Baswal said:   5 years ago
The shape factor of the standard rolled beam section varies from 1.10 to 1.20. 1 section is in rolled section and other circular rectangular etc are not in a rolled steel section.

SURAJ GIRI said:   5 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.
Diamond-section - 2.

T section : 1.90 - 1.95.

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:   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.

Sanket Sangale said:   5 years ago
I-section. - 1.14.
Rectangle & square. - 1.5.
Circular. - 1.7.
Diamond - 2.0.
Triangular - 2.34.

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.

Gajan Rana said:   6 years ago
@Asaithambi.

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