Stability of pretwisted beams in cross bracings
M. R. Shadnam and R. Abbasnia*
Sharif University of Technology, Tehran 11365-9313, Iran;
*Iran University of Science and Technology, Tehran, Iran
Pages: 328-335
Abstract
New systems of pretwisted bars are
suggested, and their stability under a
conservative load is investigated. In
this paper, closed-form relationships
are obtained for the direct evaluation
of critical loads of pretwisted cross
bracings with different end connections
and an arbitrary ratio of the
dimensionless parameters of tension and
compression elements. The equation for
the critical loads is derived for
tension and compression braces with
different section properties, lengths,
and axial loading. It is found that the
critical load of a twisted brace is
higher than that of a nontwisted brace.
Parametric solutions are graphically
displayed to clarify the distinct
behavior, including the boundary
separating symmetric and antisymmetric
modes of buckling.
|
