(55) Cold-Formed Steel Sections (small buildings)
07-23-2019, 11:24 AM
Post: #1
 SlideRule Senior Member Posts: 1,287 Joined: Dec 2013
(55) Cold-Formed Steel Sections (small buildings)
An extract from APPLICATION OF COLD-FORMED STEEL SECTIONS TO PRIMARY MEMBERS OF SMALL STEEL BUILDINGS, Missouri University of Science and Technology, 3rd International Specialty Conference on Cold-Formed Steel Structures, Alejandro L. de la Barra (M.ASCE) Professor of Civil Engineering {Universidad Iberoamericana, Mexico}, 24 NOV 1975, 32 pgs.

SUMMARY
In the greater part of Mexico there is no provision in the building codes for snow load; consequently, a low live load is generally used, and light cold formed steel members can be employed for primary members, reducing the cost per square meter of construction with these structures. A comparison is given on the weight and cost of several types of structures in actual use in Mexico against those proposed. An analysis of the ratio of labor and steel cost trend is presented.
A simplification of the design procedures is proposed, adapted to hand design with a
desk calculator, using available sections in Mexico. Possibility of use of variable sections is viewed, and results of this investigation given.
A brief study of fabrication procedure is presented with the idea of marketing through dealers to prospective customers. Erection procedures are studied with a "do-it-yourself" thought in mind.

DESIGN PROCEDURE
The simplified design procedure proposed consists of using for design the basic formulae for bending shear and axial load, or a combination of both.
The procedure of design is simplified by the use of formulae such as those given by V. Leontovich … Find maximum moments and reactions of the given rigid frame with hinged supports and constant section, subject to loads specified:

This calculation can be very much simplified by the use of a programmable pocket calculator, such as
HP-55

Appendix# 2.
HP-55 Title RIGID FRAMES WITH UNIFORM VERTICAL LOAD

HP-55 Title DESIGN OF Z COLO-ROLLED PURLINS

Excellent documentation; a pedagogic delight!

BEST!
SlideRule
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