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Optimization Of Rigid Frame Bays Using Harp Bracings

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  024027,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10472) @2002
Authors:   Jesús Montero, Pablo Galletero, Carlos Neumeister, Fausto Díaz
Keywords:   Structural analysis, metallic structure, rigid frame, harp bracing

Flat transverse frames are normally used when building bays. These frames are placed in series and held longitudinally with bracings. These two directions, transversal and longitudinal are independent of each other. Thus, the transversal frame bears loads in its plane with no help from the longitudinal bracings. In the case of transverse rigid frames, with the typology described, the pillars act as bending brackets, requiring large-size pillars and large foundations.

Against the traditional typology (exposed above), an alternative can be the utilisation of special onroof bracings called harp bracings. With these harp bracings, the loads received by the pillars are partially transmitted to the gable end. In this way, the pillars tend to behave as encastered-supported elements, which require smaller section size and foundations.

This paper presents a comparative study between rigid frames, solved with traditional bracings, and harp bracings. Spans from 10 m to 35 m are included, as well as bay lengths from 20 to 50 m. The contrast between both bracing systems is made at a budget level for the whole bay frame, including metallic frame and foundations.

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