Analysis and design of jack-up chords
Abstract
In this work, the design interaction equations determining the load carrying capacity of wide-flange, thin-walled box and circular tubular beam-columns have been investigated. Jack-up chords and members with regular sections behave differently and the aim here is to improve our knowledge and provide practical solutions for the modification of the design interaction equations. This dissertation consists of four parts. In Part One, the analytical procedure and the development of a computer program based upon the superposition method for determining the plastic strength of sections subjected to axial compression combined with biaxial bending, is discussed. In Part Two, the tangent stiffness method for determining the moment-curvature relationship of column segments and the M - P - $\Phi$ parameter expressions used for simplification are discussed. Part Three presents Newmark's iteration method for determining the maximum column strength and in Part Four, the ultimate axial load-carrying capacity of jack-up chord beam-columns is obtained by the moment-thrust-curvature based procedure. After evaluating the analytical results and comparing them with the AISC and API equations, the behavior and strength of jack-up chord members is estimated by modified equations. The computer program provides a practical tool for the analysis of jack-up chord members subjected to axial compression and biaxial bending.
Degree
Ph.D.
Advisors
Chen, Purdue University.
Subject Area
Civil engineering|Mechanical engineering|Mechanics
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