Abstract
Single angle cross bracings are customarily used in tower structures. According to the joint detailing, there exists not only force eccentricity but also rotational restraint at member ends. In addition, interaction occurs at the member buckling within a bracing panel, as well as within the two portions of a member. All these render the stability calculation rather complicate. In the current codes for tower design, simplified formulae of equivalent slenderness are given so as the member stability can be calculated as axially compressed struts. But these formulae are somewhat crude, giving unbalanced reliability. In this study, basing on the theory of elastic stability, and considering member buckling interaction in close coordination with joint detailing, formulae with better accuracy and reliability are put forward. One of the features of the proposed approach is the distinction between the cross-bracings connected to single angle leg post and those connected to a doubly symmetric leg post. The second feature lies in the refined formulae for specific interaction cases. The suggested formulae correlate well with available test data. Moreover, examination of test results reveals that it is unnecessary to specify lower buckling strength for cross-bracing bars connected by one bolt, provided that there is no in-plane eccentricity at the joint.
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