Conferences
RESEARCH ON SEISMIC DESIGN OF DEEP WIDE-FLANGE STEEL COLUMNS
IN THE U.S.
Designers in high seismic regions in the U.S. routinely use deep wide-flange columns for Steel Special Moment Frame design nowadays, a practice which deviates from that prior to the 1994 Northridge, California earthquake. This paper presents history of deep column issues that first surfaced in testing of moment connections, results from a numerical simulation that led to a comprehensive NIST-sponsored research program involving cyclic testing of more than 45 large-size columns. Findings from this program including implications to AISC Seismic Provisions will be presented.
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Hybrid Simulation of Moment Frames With Deep Columns Experiencing Axial Shortening
Wide flange steel column elements have been commonly used for steel moment frames in seismic regions. To economically comply with drift limit requirements, the moment of inertia of the section is increased by choosing slender and deep sections. However, deep columns are susceptible to local buckling and subsequent axial shortening when subjected to a combination of high axial forces and cyclic lateral loads. The interaction between the shortening columns and the surrounding structural framing system can result in a redistribution of axial loads, which has not been examined in detail. Here, this interaction is studied through a hybrid simulation of a full-scale steel moment frame subassembly using advanced hybrid simulation algorithms with new capabilities developed for this test. A new mixed displacement and force control framework is implemented to capture the coupled nature of the column axial behavior during shortening. The lateral behavior of the frame is highly dependent on the moment frame with reduced beam sections considered in this study. The experimental cruciform subassemblage includes beam-to-column connections and this measured plastic hinge response is utilized through online model updating to update parameters in the nonlinear numerical beam models. Preliminary tests are presented for these ongoing experiments.
Asian Deans’ Forum
The Rising Stars Women in Engineering Workshop
The Asian Deans’ Forum is composed of representatives from engineering schools of six leading Asian universities: Hong Kong University of Science and Technology, National Taiwan University, National University of Singapore, Seoul National University, Tsinghua University, and The University of Tokyo.
Organized by Asia’s top engineering schools, this workshop aims to bring together young female professionals in engineering disciplines from around the world, including scholars, researchers and engineers interested in exploring and advancing careers in academia, for scientific and career-oriented discussions relevant to the development of women academic leaders in Asia.Insightful plenary and keynote lectures, panel discussions and mentoring sessions will offer participants a glimpse into an academic career in top Asian universities.