Problem 5.4.C Rafters are to be used on 24-in. centers for a roof span ofthe weight of the rafters. Find the rafter size required for Douglas fir-larch16 ft. Live load is 20 psf (without snow) and the dead load is 15 psf, includingof (a) No. 1 grade and (b) No. 2 grade, based on bending stress.

The weight of an object is the force of gravity on the object and may be defined as the mass times…

Answered: span of Problem 5.4.C Rafters are to be…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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simple beam with a span of 14 ft supports a uniformlydistributed dead load of 300 lb/ft and a uniformly distributed live loadof 500 lb/ft. A 10 × 14 beam of Douglas fir–larch of select structuralgrade is used. Is the beam safe with respect to shear stress?
Design a Douglas fir-Larch No. 1 beam to support the load shown.
Accurate solution?
Using Douglas Fir larch, No. 2 Grade, pick the joist required if the live load is 40psf, the dead load is 20psf, deflection is limited to L/360, and joist spacing is 16 in on center with a span of 16?
a. Determine the allowable fiber stress in bending for a Douglas fir south select structural grade 2 Y4 for single and repetitive member use.b. What are the allowable spans for a Hem fir number 2, 2 ¥ 8 set at 12 in. o.c., 16 in. o.c., and 24 in. o.c.?
Using the ASD method, find the allowable axial compressionload for the following wood columns. Use Douglas fir–larch, No. 2grade.
Ten-feet-high 2 × 4 studs of Hem Fir, No. 1 grade, are usedin an exterior wall. Wind load is 25 psf on the wall surface; studs are 16 in.on center; the gravity load on the wall is 500 lb/ft of wall length. Investigatethe studs for combined action of compression plus bending using the ASDmethod.
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.
Problems 8.2.EH Select square column sections of Douglas fir-larch, No. 1 grade, for the following data: Required Axial Load (kips) Unbraced Length (ft) E 20 8. F 50 12 50 20 H. 100 16 WOOD COLUMNS 28 22 91 X 91 14 X 14 12 X 12 OL X 18 20 22 24 26 28 Unbraced Length (Feet)
Design a wood brace in No. 2 Doug Fir to resist a wind load where the ASD load combination results in an axial load of P – 15000 pounds. The brace length of 15 feet and K – 1.0. For the wind load only, a load direction of 1.6 will apply. You may assume normal temperature, wet conditions and not incised. You may make whatever assumptions you need in order to arrive at your solution.
Using Table 5.10, select joists to carry a live load of40 psf and a dead load of 10 psf on a span of 15 ft 6 in. Wood isDouglas fir–larch, No. 2 grade.

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