obler In Fig 2 the double angle 2L4x3x38 of A36 is subject t

obler In Fig. 2, the double angle 2L4x3x3/8 of A36 is subject to tensile load, among which dead load T 100 kips and live load TL- 25 kips. The bolt diameter is 7/8 in. in standard hole. The strength of A36 steel is Fy-36 ksi and Fu-58 ksi. 3\" 3/4.. 24g 2.48 (One angle) 2L4x3x3/8 X = 0.782\" Fig.2 CIV 360 Steel Structure Design - Mid Term Exam Student Name: Enrollment Number Date: Grade: Problem 3: What is the diameter that is used to calculate the net area of the double angle for determine its capacity? (10 points) PhotoGrid

Solution

Gross Area of one angle (A_g^\') = 2.48 in²

Total gross area (A_g) = 2 x 2.48 = 4.96 in²

Bolt diameter (d_b) = 7/8 in

Nominal hole diameter (d_h) = 7/8 + 1/16 = 15/16 in (Refer AISC LRFD section J3 2)

Hole diameter for calculating net area = 15/16 + 1/16 = 1 in (Refer AISC LRFD section B4 3b)

Net section area (A_n) = 4.96 - 2 x 3/8 x 1 = 4.21 in²