Civil Engineering Reference
In-Depth Information
Figure G12-3
Frame loading for
unheated storage
building in Design
Example 1.
26 LB/FT
2
37.3 LB/FT
2
26 LB/FT
2
7.8 LB/FT
2
37.3 LB/FT
2
26 LB/FT
2
7.8 LB/FT
2
The larger of the two controls, and its horizontal extent is 4
h
d
=
4(3.51 ft)
=
14 ft.
Figure G12-4
summarizes the load cases from the heated storage build-
ing purlins. These loads, in lb/ft, are calculated in the same manner as those
for the unheated storage building. For example, the balance load of 105 lb/ft
is calculated as
p
s
(21 lb/ft
2
) times the 5 ft purlin spacing. With the exception
of the end bay adjacent to the unheated storage building, the gable roof drift
load in
Figure G12-4G
would likely control for purlins within 25 ft of the
ridge. For purlins farther from the ridge, (i.e., beyond the horizontal extent
of the gable roof drift surcharge), one of the partial load cases in
Figure
G12-4B
through
F
would control.
For the end bay adjacent to the unheated storage building, the roof step
drift load in
Figure G12-4H
would almost certainly control the design of
purlins located from 25 to 40 ft from the ridge and may well also control the
