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Comparison of classical Winter's bracing requirements of compressed truss chord with stability analysis of 3D truss‐model
Author(s) -
Iwicki P.
Publication year - 2009
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200910097
Subject(s) - truss , bracing , chord (peer to peer) , buckling , structural engineering , stiffness , nonlinear system , mathematics , engineering , brace , computer science , physics , distributed computing , quantum mechanics
Most code requirements concerning bracing are based on principles developed by Winter. The present research is devoted to study a lateral buckling of truss with linear elastic side supports. The classical Winter's model of truss chord in the case of out of the truss plane buckling is compared with nonlinear analysis of 3D truss model. Full bracing condition, that permits the truss chord to support load level corresponding to an unbraced length equal to the distance between braces is calculated. Then an approximate buckling load with less than full bracing is developed and the model is modified to account for unequal normal force distribution in compressed chord. The coefficient of buckling length related to side support distance in function of bracing stiffness is also calculated. The results are compared to design code requirements. It is shown that buckling length of truss chord with side supports considered as elastic elements is larger than assumed in design codes. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)