# Civil Engineering - Structural Design Specifications - Discussion

Discussion Forum : Structural Design Specifications - Section 1 (Q.No. 45)
45.
If the dimensions of a rectangular section of a short column are 15 cm x 20 cm, its unsupported length should be restricted to
9.0 m
10.0 m
11.0 m
12.0 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
7 comments Page 1 of 1.

Sk j said:   2 years ago
Thanks for explaining @Harsh.

MJM Gcek said:   3 years ago
Thanks @Harsh.

Harsh said:   7 years ago
Refer IS 456.

Clause 25.3(Slenderness limit of columns)
25.3.1 say that,

The unsupported length between end restraints shall not exceed 60 times the least lateral dimension of a column.
So as per is standard
60 * 1.5 = 9 m.

I hope all clear.
(2)

Priya said:   7 years ago

Roy said:   7 years ago
Unsupported length as per clause 25.3.1 is 60 times of its least Lateral dimension which is 60x15 = 900 cm = 9 m.

Anomy said:   7 years ago
For short column.

lenth<3*least lateral dim.
Therfore, legth <3 * (15*20) = 900cm = 9m.

Laxman said:   9 years ago
It should be 15*12 = 180 cm.

Lef/b< = 12 (short column).