doi:10.3850/978-981-07-7136-2_294
Second-Order Plastic Analysis of Steel Frames by a Single Element Per Member Allowing for Arbitrarily Located Plastic Hinge
Professor Siu-Lai Chan
Department of Civil and Environmental Engineering,
The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Email: ceslchan@polyu.edu.hk
Biography
Professor Siu-Lai Chan is the author of more than 300 papers, the incumbent President of the Hong Kong Institute of Steel Construction, Deputy Chairman of Structural Division in the Hong Kong Institution of Engineers, Honorary Fellow of SSSS and adjunct professor at Southeast University in Nanjing, Harbin Institute of Technology in Harbin and Tongji University in Shanghai. He is also the chief editor of the SCI international journals “Advanced Steel Construction”, “Steel and Composite Structures (2002-2005)” and the regional editor of “International Journal of Applied Mechanics and Engineering” and a member of editorial boards in 9 other engineering journals. Professor Chan has been the principal consultant for the Code of practice for structural uses of steel 2005 and 2011 and for structural uses of glass (under preparation) published by the Buildings Department of the Hong Kong Government and a member of technical publications committee and of the Research Panel of the Institution of Structural Engineers, U.K., a member of expert panel of American Institute of Steel Construction (AISC), a member of the editorial team of the a popular guidebook “Structural Uses of Glass” published by the Institution of Structural Engineers, U.K. Recently, Professor Chan was a co-recipient with researchers at Tongji University of the first class award for research in steel structures by the Education Ministry in the Mainland China and received several research and consultancy awards from his university. In the past decade, his work in second-order direct analysis, appears in chapter 5 of the steel code, changes the design practice towards a more reliable and efficient design approach and used by major consultants in Hong Kong for projects in the region.
His paper describes his work developed for and applied to projects for design of temporary structures in Taiwan and U.K.
Abstract
This paper proposes an analytical model using one element per member for second-order inelastic analysis of steel frame, allowing for initial imperfections, geometric and material nonlinearities. A new curved beam-column element with an arbitrarily located hinge (ALH) along member length is introduced. Further, two plastic hinges at element ends are also integrated into the new element formulations. The plastic hinges are simulated as gradually softening springs and the corresponding formulae are also presented. In this element, the member initial imperfection is explicitly modeled so that the P-δ effect can be directly considered in structural analysis. It further utilizes the elastic buckling mode as initial imperfection shape for determination of the global frame P-Δ imperfection. The conventional formulation requires two or more elements to capture the plastic behavior along the member while one element per member is sufficient in the proposed analytical model. Consequentially, the saving in computer time and data manipulation efforts is considerable. Finally, several benchmarking examples are given for verifying the accuracy and validity of the proposed method.
