PRESENTATION: Advantages of direct second order analysis for designing complex structures NZ

When – Thursday 4th August 2016 //

Abstract:
Bifurcation and finite-deflection stability analyses represent two general stability theories and they lead to the first-order linear and direct analysis methods of design for checking of structural stability and capacity. In the bifurcation approach, design is based on an assumed buckling mode at undeformed structural geometry for a specific load case and all columns have their own effective lengths and buckle simultaneously in concept. The effective length method of design has limited accuracy since no practical structures could have elastic buckling at undeformed state without deflections and the error of assuming an incorrect effective length by manual inspection could be catastrophic.
In contrast, the direct analysis approach uses an analysis to predict the loss in stiffness of a deforming structure which is loaded to the various limit states. The direct analysis method of design has been well received by the design profession as a superior and preferred alternative to the effective length method since its introduction in the design codes LRFD in U.S., European and Hong Kong codes some fifteen years ago. The obvious advantage of the direct analysis includes redundant members not over-designed and critical members not under-designed and it could deal with design of structures rationally under different scenarios like fire and seismic engineering, progressive analysis, load sequence studies etc.
This seminar presents the theoretical background with practical considerations of the direct analysis method of design with benchmark and practical examples given on its concept and practical application to complex structures beyond the applicability of the effective length method when the elastic buckling load factor is less than 10 or 5. Experience in using the method for practical design of structures will also be shared.

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About the Speaker:
Dr. SL Chan published more than 300 papers in journals, books and conferences. His book, “Non-linear static and cyclic analysis of steel frames with semi-rigid connections, Elsevier, 2000, pp.336”, summarizes his work on “analysis for design of steel structures” before this century. Dr. Chan also serves as chief editor and a member of editorial board eight international journals including the journals of Engineering Structures and Constructional Steel Research, of ad-hoc committees in drafting guides for design of steel and glass structures in Hong Kong and the U.K., the incumbent President of the Hong Kong Institute of Steel Construction (HKISC), chief editor of its SCI-indexed International Journal “Advanced Steel Construction”, and adjunct professor at several leading universities in Mainland China. In conjunction with a research team of the Tongji University, Professor Chan was given the first class award for research in steel structures by the Education Ministry in the Mainland China in 2008. Professor Chan also received numerous research and consultancy awards from his university, research and project awards from the Hong Kong Institution of Engineers and served as the Chairman of the Structural Division (2013-2014) of the institution. He also serves in several other advisory committees of the Hong Kong SAR Government, including the assignment as the chief consultant of the Code of practice for structural uses of steel, Hong Kong 2005 and 2011