A straightforward means to reduce the mass of a truss beam is to replace some of its rigid members with prestressed tendons. Such a solution, however, involves unique design considerations, most of which have been previously unaddressed in the literature. The present paper seeks to fill this gap by reviewing the general mechanics of and some specific design considerations for a basic class of such structures: regular triangular truss beams with tendon diagonals. The issues considered and illustrated in the context of three architectural options are the pretension necessary for tautness, member vibration, parasitic force effects, truss face accuracy, longeron compression eccentricities, and stiffness. This review offers not only design formulas for one redundant and two determinate variants of the considered class of trusses, but also a blueprint for the systematic analysis and design of other trusses with prestressed members. Two specific details of the involved derivations bear further significance: 1) some shear compliance formulas regularly used for truss beam Timoshenko continuum modeling are shown to be flawed and are corrected and 2) it is illustrated that structural asymmetry may be beneficial: the stiffness of an asymmetrically laced beam is shown to exceed that of its symmetric alternative.
Truss beam with tendon diagonals: Mechanics and designs
Verfachter Träger mit Diagonalverstärkungen: Mechanik und Entwürfe
AIAA Journal ; 46 , 3 ; 557-567
2008
11 Seiten, 8 Bilder, 8 Tabellen, 31 Quellen
Article (Journal)
English
Truss Beam with Tendon Diagonals: Mechanics and Designs
AIAA | 2008
|AIAA-2006-1945 Truss Beam with Tendon Diagonals --- Mechanics and Designs
British Library Conference Proceedings | 2006
|STRUCTURAL MECHANICS AND MATERIALS - Truss Beam with Tendon Diagonals: Mechanics and Designs
Online Contents | 2008
|