Second-Order Inelastic Analysis of Steel Frames Using Element with Midspan and End Springs
Publication: Journal of Structural Engineering
Volume 121, Issue 3
Abstract
An efficient method for elastoplastic large-deflection analysis of steel frames using an element with plastic hinges at midspan and two ends is proposed. The need in conventional methods to divide a member into two or more elements to model the distributed loads, and the need to allow for a plastic hinge at its span is eliminated. The formation of plastic hinges is simulated as gradually softening springs. This approach prevents the overestimation of the capacity of a steel frame and also reduces the complexity in data handling. Because the element stiffness matrix is explicitly derived, the additional computational effort for forming the element matrix only involves a few algebraic calculations and is therefore minimal. The saving in the overall computer time and data input and output efforts is considerable since a single element can be used to model one beam member in the ultimate analysis of most practical structures. Most importantly, the linear structural model can be directly used for a second-order inelastic analysis, leading to a convenience and consistency in extending a linear analysis to a nonlinear analysis.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 121 • Issue 3 • March 1995
Pages: 530 - 541
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Mar 1, 1995
Published in print: Mar 1995
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