Abstract

Info

Author(s):: ZHAO Er-fei; CHENG Kai; ZHOU Zhen-ping; (School of Mechanical Science and Engineering, Jilin University, Changchun 130022, Jilin, China)

Keywords:: Mechanical engineering; symmetric point to point type; lattice boom; chord; length factor; buckling load; beam-column theory; stability equation

Abstract:: In order to obtain the quick and reliable method to compute the buckling load of the chord, the symmetric point to point truss structure was reasonably simplified, and a spatial mechanical model involving the interaction between chords and web members was established. The stability equation of the chord was derived by using the beam-column theory and was solved to obtain the buckling deformation plane and buckling load of the chord. The results show that the correctnesses of the mechanical model and derivational process are verified by comparing with the results with FEM. By comparison with the buckling load considering web members of only one single plane, the buckling load calculated by using a single plane in which the stiffnesses of web members are weaker, substitutes that of chord. By simplifying stability equation of this approximate calculation method, method by means of solving transcendental equation is established to determine the length factor of chord. Method in this study provides theoretical basis for buckling load of chord form the symmetric point to point truss structure, which can be applied to the practical engineering.