5.15-7 The truss shown in Figure P5.15-7 is one of several roof trusses spaced 18 feet apart. Purlins are located at the joints and halfway between the joints. Sag rods are located midway between the trusses. The weight of the roofing materials is 15 psf, and the snow load is 20 psf of horizontal projection of the roof surface. Use LRFD and select a W shape of A992 steel for the purlins. Manual Table 6-2 may be used. 15'-0" 6 @ 15'-0" = 90'-0" an FIGURE P5.15-7

5.15-7 The truss shown in Figure P5.15-7 is one of several roof trusses spaced 18 feet apart. Purlins are located at the joints and halfway between the joints. Sag rods are located midway between the trusses. The weight of the roofing materials is 15 psf, and the snow load is 20 psf of horizontal projection of the roof surface. Use LRFD and select a W shape of A992 steel for the purlins. Manual Table 6-2 may be used. 15'-0" 6 @ 15'-0" = 90'-0" an FIGURE P5.15-7

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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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

5.15-7 The truss shown in Figure P5.15-7 is one of several roof trusses spaced 18
feet apart. Purlins are located at the joints and halfway between the joints.
Sag rods are located midway between the trusses. The weight of the roofing
materials is 15 psf, and the snow load is 20 psf of horizontal projection of the
roof surface. Use LRFD and select a W shape of A992 steel for the purlins.
Manual Table 6-2 may be used.
15'-0"
6 @ 15'-0" = 90'-0"
an
FIGURE P5.15-7

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