A roof system consists of trusses of the type shown in the figure below, spaced at 20 feet apart. Purlins are to be placed at the joints and at the midpoint of each top chord member. Sag rods will be located midway between trusses.. The total gravity load, including an estimated purlin weight is 20psf of roof surface, with a live load to a dead load ratio of 1.0. Assuming that this is the critical loading condition, use A 36 Steel and select a channel shape for the purlins. Use

A roof system consists of trusses of the type shown in the figure below, spaced at 20 feet apart. Purlins are to be placed at the joints and at the midpoint of each top chord member. Sag rods will be located midway between trusses.. The total gravity load, including an estimated purlin weight is 20psf of roof surface, with a live load to a dead load ratio of 1.0. Assuming that this is the critical loading condition, use A 36 Steel and select a channel shape for the purlins. Use

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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Question

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1. A roof system consists of trusses of the type
shown in the figure below, spaced at 20 feet
apart. Purlins are to be placed at the joints and
at the midpoint of each top chord member. Sag
rods will be located midway between trusses..
The total gravity load, including an estimated
purlin weight is 20psf of roof surface, with a
live load to a dead load ratio of 1.0. Assuming
that this is the critical loading condition, use A
36 Steel and select a channel shape for the
purlins. Use
a) LRFD
15'-0"
b)
6 @ 15'-0" = 90'-0"
ASD.

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steel joist is spaced at 3’-0” oc and spans 35’-0”. It carries a dead load of 45 psf and a live load of 100 psf. What is the most economical steel joist able to carry this load? a. 24K7 b. 26K7 c. 28K7 d. 30K7
A floor systems has its beams spaced at 9 ft apart. The dead load is 120 psf and the live load is 110 psf. The factored LRFD uniform load on this beam due to to dead and live loads in lb/ft is equal to: Group of answer choices 2100 lb/ft 2880 lb/ft 2420 lb/ft 330 lb/ft
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LEARNING ACTIVITY – 3 Problem. A 16x13 136 Steel Purlins spaced @0.81 m. o.c. with 11 mm. diameter Sagrods & Tierods @midpoint is subjected to the following roof loads: D=1.10 KPa, Lr=0. 10 KPa , & V=210 KPH (wind velocity). Use Fy=250 MPA & fs=151 MPa, Lb=4. 10m. o.c. (spacing of truss) Required: Check the adequacy of the following using LRFD-NSCP 2010 & MRM: (1) 16x13 136 Steel Purlins; (2) 11 mm. diameter Sagrods & Tierods.