Plastic Design and Second-Order Analysis of Steel Frames

Chen, Wai‐Fah; Sohal, I.

doi:10.1007/978-1-4613-8428-1

Cited by 62 publications

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“…In the secondorder elastic plastic analysis, the deformed shape is considered and geometric nonlinearities can be included using stability functions which enable use of only one beamcolumn element per member to capture the second-order effects. A comprehensive presentation of the plastic design and second-order analysis method can be found in the book by Chen and Sohal [9].…”

Section: Elastic-plastic Hinge Methodsmentioning

confidence: 99%

Advanced analysis for structural steel building design

Chen

2008

Front. Archit. Civ. Eng. China

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The 2005 AISC LRFD Specifications for Structural Steel Buildings are making it possible for designers to recognize explicitly the structural resistance provided within the elastic and inelastic ranges of behavior and up to the maximum load limit state. There is an increasing awareness of the need for practical secondorder analysis approaches for a direct determination of overall structural system response. This paper attempts to present a simple, concise and reasonably comprehensive introduction to some of the theoretical and practical approaches which have been used in the traditional and modern processes of design of steel building structures.

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Section: Elastic-plastic Hinge Methodsmentioning

confidence: 99%

Advanced analysis for structural steel building design

Chen

2008

Front. Archit. Civ. Eng. China

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“…However, for stocky members exhibiting significant yielding, the elastic-plastic hinge analysis over predicts the maximum strength of the structure [25] because of the assumptions that perfect plasticity and zero-length plastic hinges exist. Some refinements are needed to capture the effects of distributed yielding associated with plastification and residual stresses through the cross section.…”

Section: Second-order Refined Plastic Hinge Methodsmentioning

confidence: 99%

“…For indeterminate beams and frames, the plastic limit load will be higher than the initial yield load because of plastification of steel and moment redistribution of the system. In a first-order hinge-byhinge analysis, we assume all the plastic rotations occur at the plastic hinges and the plastic hinge length is zero [25]. The percentage of plastic strength reserved in the beam beyond the elastic limit through moment redistribution is:…”

Section: Redistribution Of Internal Forcesmentioning

confidence: 99%

The Era of Finite Element

2011

Understanding Structural Engineering

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ACKNOWLEDGEMENTSI would like to express my deepest appreciation to my advisor and committee chairperson, Professor Wai-Fah Chen, for his guidance and motivation during my learning career at Purdue University and University of Hawaii at Manoa. Whether through our numerous meetings and e-mails I have learned a lot from Professor Chen.His patience and encouragement gave me the confidence and willingness to overcome the many difficulties encountered while doing this research. He has shown concerns for my academic career at graduate level and also for my future. I believe his valuable advice will benefit me throughout my future endeavors. Finally, I would like to present special thanks to my parents, for their consideration and support that made this work possible. III ABSTRACTThe trends for analysis and design of steel frames are indicated in this dissertation.The current practice consists of applying the first-order elastic analysis with amplification factors or second-order elastic analysis in combination with the AISC-LRFD interaction equations. Determination of the effective length factors and individual member capacity checks are necessary to select adequate structural member sizes. The direct analysis method is a second-order elastic analysis approach that eliminates the determination of effective length factors from the current AlSC-LRFD method. Unsupported member length is used to calculate the axial strength of a member. Equivalent notional loads and/or modified stiffness are applied together with the external loads to account for the effects of initial out-of-plumbness and inelastic softening. For both AlSC-LRFD and direct analysis methods, a structure is analyzed as a whole, but the axial and flexural strength of each member is examined individually. Inelastic redistribution of internal forces in the structural system cannot be considered. As a result, determined member forces are not correct and more conservative member sizes will be obtained. Moreover, member-based approaches cannot predict structural behaviors such as failure mode and overstength factor.The advanced analysis method considered in this work is a second-order refmed plastic hinge analysis in which both effective length factors and individual member capacity checks are not required. In addition, advanced analysis is a structure systembased analysis/design method that can overcome the difficulties of using member-based IV design approaches. Thus, advanced analysis is a state-of-the-art method for steel structure design.Several numerical examples are provided to show the design details of all three methods. The design requirements corresponding to each analysis approach are illustrated in these examples. The pros and cons of each method are discussed by comparing the design results.Advanced analysis is also a computer-based analysis and design procedure consistent with the features of performance-based design. Applying advanced analysis to performance-based fire resistance and seismic design are proposed. This dissertation shows advanced ana...

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“…The kinematical assumption used was the powerful concept of "plastic hinge." Upper and lower bound solutions were obtained by the simple mechanism methods bounded above; and the simple equilibrium methods with moment check bounded below (see for example, Chen and Sohal, 1995). The Plastic Design method was officially adopted by the American Institute of Steel Construction in the early 1960's (see, for example, ASCE Manual 41, 1971).…”

Section: Strength Of Materials Approach To Structural Engineering In mentioning

confidence: 99%

Structural engineering: Seeing the big picture

Chen

2008

KSCE Journal of Civil Engineering

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The state-of-the-art of progress of structural engineering over the last 50 years is examined in three areas: (1) The spatial idealization of structural elements in the form of kinematical assumptions; (2) The constitutive idealization of materials in the form of generalized stresses and generalized strains relations; and (3) The computational implications of solution strategy in the form of closed form, approximate, and numerical procedures on the structural level.

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Plastic Design and Second-Order Analysis of Steel Frames

Abstract: Library of Congress Cataloging-in-Publication Data Chen, Wai-Fah, 1936-Plastic design and second-order analysis of steel frames / W.F. Chen, 1. Sohal. p. cm. Includes bibliographical references and index.

Cited by 62 publications

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Advanced analysis for structural steel building design

Advanced analysis for structural steel building design

The Era of Finite Element

Structural engineering: Seeing the big picture

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