ARCE 226 Structural Systems
California Polytechnic State University, SLO Kelsey Parolini, S.E.
Homework No. 4
Using the framing layout shown below completed d1e following.
1. Draw the loading diagram (F.B.D.) of a loaded interior and exterior purlin. T
ROOF DEAD LOAD = 10 PSF
ROOF LIVE LOAD = 20 p3.- TYP. EXTERIOR TRUSS
ALL MEMBER SELF WEIGTH INCLUDED
TYP. EXTERIOR COLUMN
TYP. INTERIOR TRUSS
TYP. INTERIOR COLUMN
TYP. JOIST (A)
EXT. PURLIN (c)
INT PURLIN (B)
There are four main assumptions made in the
analysis of truss
l Truss members are connected together at their
2 Truss are connected together by frictionless
3 The truss structure is loaded only at the joints.
4 The weigh
. a: .< sun-:nwaw.wmhilW_
Table 3.1 Weights of Building Materials
B'll ll ll illillt E
I Roof dead loads
Asphalt shingles 2.
Wood shingles, 1 in. 3
3-ply with gravel 5
5-ply with gravel 6
Copper or Tin 1
Book tile, 2