# Homework No. 1 Structural Engineering and Design Loads

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```					CE 405: Design of Steel Structures – Prof. Dr. A. Varma

Homework No. 1: Structural Engineering and Design Loads
A two-dimensional (2D) building frame is shown in the following figures. The dead loads,
using the ASCE 7-98 Standards, and are shown in the Figures. The roof load is found to be equal
to the snow loads for this frame. Assume that all the column sections are W12 x 50, all the beam
sections are W14 x 68, and all the truss members are W6 x 20.

Conduct linear elastic analysis of the frame for the following load combinations:
•   1.2D + 1.6L + 0.5(Lr or S)
•   0.9D ± 1.3W
•   1.2D + 0.5L + 0.5(Lr or S) + 1.3W

Determine the design forces, i.e., the tension force, compression force, shear force, and
bending moment (positive and negative), for the fifteen members indicated in Figure 3 for the

Combination
Tension Compression Shear Pos. Moment      Neg. Moment
CE 405: Design of Steel Structures – Prof. Dr. A. Varma

1.5 k
1.5 k
0.75 k                                              0.75 k   10 ft.

10 ft
1.5 k                  0.5 k/ft 3.0 k                     1.5 k 12 ft.
0.5 k/ft

1.5 k                               3.0 k                 1.5 k 12 ft.
0.5 k/ft             0.5 k/ft

1.5 k 12 ft.
1.5 k                  0.5 k/ft 3.0 k       0.5 k/ft

15 ft.

20 ft.                  20 ft.

10 ft.

0.5 k/ft        10 k     0.5 k/ft     5k     12 ft.
5k

5k               0.5 k/ft        10 k     0.5 k/ft     5k     12 ft.

0.5 k/ft        10 k     0.5 k/ft     5k     12 ft.
5k

15 ft.
CE 405: Design of Steel Structures – Prof. Dr. A. Varma

3.0 k
3.0 k
=                                         13
Snow Load (S) 1.5 k                                         14
15
1.5 k       10 ft.

12
10                     11            12 ft.

8
7                       9                                          12 ft.

5
4                   6             12 ft.

2

1                       3                                          15 ft.

20 ft.                          20 ft.
0.8 k         0.9 k
Wind Load (W)                           1.6 k                               1.8 k
0.8 k                                                          0.9 k             10 ft.
1.4 k                                                                             0.8 k

12 ft.

2.5 k                                                                             1.6 k

12 ft.

2.5 k                                                                             1.6 k

12 ft.

2.5 k                                                                            1.8 k

15 ft.

```
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