3 new papers about space structures
1. Failure mode and strength of space truss compression chord members
Engineering Structures
Volume 21, Issue 5, May 1999, Pages 395-405
Abstract
A number of new space truss systems employ continuous and eccentric chord members. The present paper is intended to provide
a better understanding of the effect of load eccentricities on the truss member performance, especially those in compression. Special
emphasis is given in this paper to channel sections and rectangular hollow sections for being the most commonly used in the new
truss systems. These sections are analysed algebraically, then underwent a series of parametric studies designed to assess their
performance in various situations and to establish their best shape and working conditions. The results can be of significant benefit
to the design procedure of space trusses with continuous and eccentric chord members.
2. Effect of force limiting devices on behaviour of space trusses
Engineering Structures
Volume 21, Issue 1, January 1999, Pages 34-44
Abstract
Earlier research on space trusses has identified their tendency to collapse in a brittle manner upon the buckling of a number of
critical compression members. In an attempt to alter the brittle post-buckling characteristics of truss compression members, and
hence introduce overall truss ductility, force limiting devices can be used. These devices are fitted to critical compression members,
and designed to provide a pure elastic–plastic behaviour with a long plateau of member ductility. The present study has been
carried out to assess the effect force limiting devices can have on truss overall behaviour, and to determine where they should be
used in order to achieve the best benefit. Typically, a compromise has to be struck between the improvement to structural behaviour
associated with these devices and the cost addition caused by their use; in most circumstances, the use of force limiting devices
is limited to a small selection of the most critical compression chord members.
3. OPTIMAL DESIGN OF PRESTRESSED TRUSSES
Computers & Structures
Volume 43, Issue 4, 17 May 1992, Pages 741-744
Abstract
This paper is concerned with the effect of prestress on the minimum weight design of singly
loaded trusses which are required to satisfy stress constraints. Use is made of realizability theorems to
derive two distinct formulations--the equilibrium formulation and the hybrid formulation, in a linear
programming form. The former has the member forces as unknown variables whereas the latter searches
directly for the prestressing system and calculates the member forces a posteriori. A 72-bar double layered
grid is used as an example to show weight savings of up to 37%.
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