Fink trusses spaced at 20 feet on centers support W6 x 12 purlins, as shown in Figure 3.32a. The purlins are supported at their midpoints by sag rods. Use A36 stee and design the sag rods and the tie rod at the ridge for the following service loads. Metal deck: Built-up roof: Snow: Purlin weight: 2 psf 5 psf 18 psf of horizontal projection of the roof surface 12 pounds per foot (lb/ft) of length

Fink trusses spaced at 20 feet on centers support W6 x 12 purlins, as shown in Figure 3.32a. The purlins are supported at their midpoints by sag rods. Use A36 stee and design the sag rods and the tie rod at the ridge for the following service loads. Metal deck: Built-up roof: Snow: Purlin weight: 2 psf 5 psf 18 psf of horizontal projection of the roof surface 12 pounds per foot (lb/ft) of length

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Example 3.15
FIGURE 3.32
Fink trusses spaced at 20 feet on centers support W6 x 12 purlins, as shown in
Figure 3.32a. The purlins are supported at their midpoints by sag rods. Use A36 steel
and design the sag rods and the tie rod at the ridge for the following service loads.
Metal deck:
Built-up roof:
Snow:
Purlin weight:
46.6'
2 @
12' = 24'
4.679 k
46.6
18.17k
(b)
2 psf
5 psf
45
18 psf of horizontal projection of the roof surface
12 pounds per foot (lb/ft) of length
112
42'
90'
(a)
P
P
2@
12' = 24'
F
R
R
12
(c)
45
3'
3'
3'
3'
12'
4.679 k
4.679k

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