ce 160 notes - dead load - san jose state university lab 4 notes.pdf · ce 160 notes - dead load...
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Vukazich CE 160 Dead Load Notes [L4] 1
CE 160 Notes - Dead Load Dead Load – Fixed position gravity load Dead Loads are calculated from tables of weights of building materials (similar to Table 2.1 in text or in AISC steel construction manual) and are usually computed in psf (lb/ft2) Dead Load Table
Use tables of weights of building materials (e.g. AISC Manual of Steel Construction) Convenient to work in unit weight (psf)
Load Path →
Material To metal
deck To beams (W14x22)
To girders, truss
(Lines 1-3) To columns
1-1/2” 18 gauge metal deck
2.82 (A) 2.82 2.82 2.82
Fireproofing 0.5 0.5 0.5 0.5
2” Rigid fiberglass insulation
3 (B) 3 3 3
3 ply felt tar and gravel roofing
5.5 (B) 5.5 5.5 5.5
Ceiling and Lighting
1 (B) 1 1 1
W14x22 @ 6 ft o.c. 3.7 (C) 3.7 3.7 Mechanical (plumbing, HVAC)
4 4 4
W18x50, truss 4 4 Weight of columns 1 Misc. 3 3 3 3 Total 15.82 23.52 27.52 28.52 Use 16 psf 24 psf 28 psf 29 psf Notes:
A. From Vulcraft deck catalog. B. From AISC steel manual “Weights of Building Materials”. C. W14x22: (22 lb/ft)/(6 ft) = 3.7 psf.
Vukazich CE 160 Dead Load Notes [L4] 2
Vukazich CE 160 Dead Load Notes [L4] 3
Lab #4 Problem
1. For our example steel building, using the uniform roof dead load table, draw the
idealization of the following members: A. One of the W14x22 beams between lines A and B (assume simple beam
connections can be idealized as a pin at one end and roller at the other); B. The W18x50 girder on line 2 between lines B and C (assume simple beam
connections can be idealized as a pin at one end and roller at the other); C. The truss on line 1 (as shown below, assume that the columns provide
supports that can be idealized as a pin at one end and roller at the other);
A
B
C
D
1 2 3
22’-0” 22’-0” 1’-6” 1’-6” 1’-6”
18’-0”
18’-0”
18’-0”
1’-6”
6’-0” typ. W14x22
W14x22
W18x65
W14x22
W14x22
W18x65
W14x22
W14x22
W18x65
W18x65 W14x22
W14x22
DO
DO
DO
DO
DO
DO
DO
DO
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
Dbl
6x6
Vukazich CE 160 Dead Load Notes [L4] 4
2. For the idealization of the truss found in 1C, use the method of sections to find
the truss member force in the members indicated in the figure above.
A B C 18’-0” 18’-0”
6’-0” typ.
4’-0”
Findtheaxialforceinthesemembers