Using Douglas fir–larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf, dead load is 10 psf, and deflection is limited to L/360 under live load only. TABLE 5.10 Maximum Spans for Floor Joists (ft-in.)aJoist SizeSpacing (in.)2 x 62x 82 x 102 x 12Live load = 40 psf, Dead load = 10 psf, Maximum live-load deflection = L/3601210-914-217-920-7169-912-715-517-1019.29-111-614-116-3248-110-312-714-7Live load = 40 psf, Dead load = 20 psf, Maximum live-load deflection = L/3601210-613-316-318-10169-111-614-116-319.28-310-612-1014-10247-59-5011-613-4Source: Compiled from data in the International Building Code (Ref. 4), with permission of thepublisher, International Code Council."Joists are Douglas fir-larch, No. 2 grade. Assumed maximum available length of single piece is26 ft.

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Using Douglas fir–larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf, dead load is 10 psf, and deflection is limited to L/360 under live load only.

Using Douglas fir–larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf, dead load is 10 psf, and deflection is limited to L/360 under live load only.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Sizing Joists and Rafters

In civil engineering and building construction, joists and rafters are the major components including beams and columns. Almost every structural construction including buildings, skyscrapers, bridges, commercial complexes, and so on makes use of joists and rafters to provide structural integrity to the building. Joists are primarily thick long pieces of metals, concrete, or wood that are used to support the floor and ceiling. On the other hand, rafters form the major component of pitched roofs, which are a series of sloped long pieces extending from a ridged area that makes contact with the plane area of the wall. They account for the load-bearing of the building along with the beams.

Question

TABLE 5.10 Maximum Spans for Floor Joists (ft-in.)a
Joist Size
Spacing (in.)
2 x 6
2x 8
2 x 10
2 x 12
Live load = 40 psf, Dead load = 10 psf, Maximum live-load deflection = L/360
12
10-9
14-2
17-9
20-7
16
9-9
12-7
15-5
17-10
19.2
9-1
11-6
14-1
16-3
24
8-1
10-3
12-7
14-7
Live load = 40 psf, Dead load = 20 psf, Maximum live-load deflection = L/360
12
10-6
13-3
16-3
18-10
16
9-1
11-6
14-1
16-3
19.2
8-3
10-6
12-10
14-10
24
7-5
9-50
11-6
13-4
Source: Compiled from data in the International Building Code (Ref. 4), with permission of the
publisher, International Code Council.
"Joists are Douglas fir-larch, No. 2 grade. Assumed maximum available length of single piece is
26 ft.

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