THE INFLUENCE OF AXIAL FORCES ON THE COLLAPSE LOADS OF FRAMES
BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
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In the limit analysis of frames the influence of the axial forces is usually neglected because the limit moment of a section is not reduced seriously by a moderate axial force. In an earlier paper concerned with the limit analysis of arches it was shown that the presence of axial forces requires the use of yield hinges that allow not only relative rotation but also relative axial displacement of adjacent cross sections. In the present paper a different approach is discussed the extendible hinges on the center line are replaced by ordinary hinges off the center line. It is shown that, under certain assumptions, the location and the limit moment of an off-center hinge are independent of the axial force. The collapse load of a frame in which axial forces must be considered is thus found to equal the collapse load of a slightly modified frame in which axial forces may be neglected.
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