FLOOD02929

• County: Statewide
• Community: na
• Basin: Statewide
• Title: Manufactured Home Installation in Flood Hazard Areas
• Date: 9/1/1985
• Prepared By: FEMA
• Floodplain - Doc Type: Educational/Technical/Reference Information

s

Sx
W

Wi
W'f

W*f

Wu
W'u

= Vertical member spacing (ft)
= Section modulus (in3)
, ,
= Outside width of manufactured home (ft)
= Lateral wind load (pst)
= Lateral wind load per vertical member (/b)
= Lateral wind load adjusted parallel to bracing (Ib)
= Uplift wind load (pst)
= Uplift wind load per vertical member (Ib)

Vertical Member Loads

The vertical load on each elevating member from Table 4.10 must be determined for two design con-
ditions: 1) where roof live load governs and 2) where wind load governs.
For the first condition above, roof live load, dead load, and floor load act vertically downward through
the chassis I-beam. This load (Fr) is determined as follows:

Fr = [(Rf)(Ar) + (Df + Ff)(Af)J

'1

Where:

Fr = Load per vertical member (Ib)

Ri = Roof live load (pst)

Ar = Roof area including eaves (ft2)

Of = Dead load (pst)

Ff = Floor live load (psf)

Af = Floor area (ft2)

'1 = Number of vertical members (load points)

For the second condition above, the lateral wind load is transferred to the chassis I-beam and the
dead load and floor live load act vertically downward through the chassis I-beam. This load (Fw) is deter-
mined as follows:

Lw + (Of + Ff)(Af)

'1

Fw =

- Where:

Fw = Load per vertical member (Ib)

Df = Dead load (psf)

Fi = Floor live load (psf)

Af = Floor area (ft2)

'1 = Number of vertical members (Ioa'd points)

Lw = Vertical load due to wind (I b)
The vertical load due to wind is calculated as follows:

Lw
Where:
h

Wf
L

[(h/2)(12)(Wf)(L)(h))
=
a

= Outside height of manufactured home, including perimeter rail and chassis I-beam (It)
= Lateral wind load (pst)
= Outside length of manufactured home (ft)

90