Accounting of centrally-compressed steel rods actual work at stability calculation
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2018, Vol 1, Issue 70
Abstract
In the article, the authors investigate the actual work of coverings trusses centrally compressed steel T-section rods composed from two angles at stability calculating. Flexibility of these rods takes the value λ ˃ 60. The actual work of the structural element is taken into account by the working conditions coefficient. At the same time, according to the current norms, the stability coefficient is determined directly in the calculation of the investigated rods, taking into account the work of the structural element under real conditions, where there are initial curvatures of the rods associated with different factors. In this way, it is not an ideal centrally compressed rod that is considered, but an eccentric-compressed with small eccentricity. But, the working conditions coefficient also takes into account this unfavorable circumstance, which was not directly reflected in calculations before, and now it is taken into account by determining the values of the stability coefficient with allowance for the initial curvatures of the compressed element. The values of the stability and working conditions coefficients of the considered rods simultaneously take into account the features of the real design and the initial imperfections of the rods. And this can lead to an unjustified stability reserve of the centrally compressed rods of the trusses and to an increase of structure`s metal capacity. The use of the stability coefficient, determined at stability calculating of the centrally compressed steel rods of the trusses, leads to a stability reserve up to 13.06% due to the re-registration of the initial curvatures of the rod, which have already been taken into account by the working conditions coefficient (γc = 0.8).
Authors and Affiliations
Y. V. , Kupchenko, P. M. , Singayevsky
Keywords
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