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CIE 430 DESIGN OF WOOD STRUCTURES

SPRING 2014

ASSIGNMENT No. 1

Introduction to Wood Design Due Date:

Problem No. 1 For the house framing section shown in the figure below, determine:

a) The roof dead load, Dq , in pounds per square foot (psf) on a horizontal plane. b) The wall dead load, Dp , in psf of wall surface area. c) The wall dead load, Dw , in pounds per horizontal foot of wall.

(10psf)

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Problem No. 2 For the building framing section shown in the figure below, determine:

a) The roof dead load, rDq , in psf. b) The second-floor dead load, fDq , in psf.

Suspended AcousticalFiber Board System

Movable Steel Partition

Suspended Steel Channel Ceiling System

Suspended AcousticalFiber Board System

Movable Steel Partition

Suspended Steel Channel Ceiling System

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Problem No. 3 The roof framing plan of an industrial building is shown in the figure below. The construction of the roof consists of:

Roofing: 5-ply felt and gravel Sheathing: 15/32-in plywood Subpurlin: 2 x 4 (cross-sectional area = 5.25 in2) at 24 in. o.c. Purlin: - 4 x 14 (cross-sectional area = 46.36 in2) at 8 ft o.c. Girder: 12 x 20 (cross-sectional area = 224.25 in2) at 20 ft o.c.

It can be assumed that the loads are uniformly distributed over the roof surface. Assuming a specific gravity G = 0.5 for the wood members, Find:

a) The average dead load, Dq , over the entire roof in psf b) The tributary dead load, Dw , on the subpurlins in lbs/ft. c) The tributary dead load, Dw , on the purlins in lbs/ft. d) The tributary dead load, Dw , on the girders in lbs/ft. e) The tributary dead load, DC , on column C1 in kips.

12 x 20

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Problem No. 4 The roof framing plan shown in the figure below has girders G1, G2, and G3 supporting gravity loads from the purlins P1. The roof dead load Dq =13 psf, the roof live load is Lq = 15 psf and the roof snow load Sq =20 psf. a) Draw the factored shear and moment diagrams for girder G1 G2, and G3

assuming a series of concentrating reaction loads from the purlins P1. b) Draw the factored shear and moment diagrams for girders G1, G2, and G3

assuming a uniformly distributed load over the entire span (unit load times the tributary width),

c) Compare the results obtained in a) and b) and comment.

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