报告题目：Reserve Capacity and Seismic Collapse Prevention for Braced Frames in Moderate Seismic Regions
报告人：Prof. Larry Fahnestock 美国伊利诺伊大学香槟分校
报告时间：2016年8月18日14:00
报告地点：综合实验三号楼5楼会议室
报告人简介：Larry Fahnestock博士自2006年起在美国伊利诺伊大学香槟分校（UIUC）任教，现任UIUC土木与环境工程系副教授。他于1996年在美国Drexel University获得土木工程学士学位和建筑学学士学位，1998年和2006年在Lehigh University分别获得硕士和博士学位。他是美国土木工程学会会员，美国地震工程研究所会员，美国钢结构学会会员以及美国结构稳定性研究委员会副会长。Larry Fahnestock博士的主要研究方向包含地震工程学、钢结构、结构抗震设计、结构节点性能、极端荷载下桥梁性能、连续性倒塌以及结构大尺度实验研究等。2016年获美国钢结构协会特别贡献奖。担任本科生和研究生钢结构设计课程的主讲教师，并获得多项教学成果奖。
Abstract
Steel concentrically-braced frames (CBFs) are used extensively as lateral-force-resisting systems for low to mid-rise buildings in moderate seismic regions of the United States, such as the East Coast and Midwest. These CBFs are economical since they are stiff, strong and relatively simple to design, fabricate and erect. Although good structural performance of CBFs for typical gravity and wind loading is well-established, there is little evidence – either from experimental research or field observation – related to CBF performance when subjected to design-basis earthquake demands. CBFs in moderate seismic regions are often not specifically detailed to achieve ductile inelastic response, so the effect of brittle limit states is largely unknown. As a result of this situation, a research project was initiated to investigate the seismic performance of CBFs in moderate seismic regions with particular focus on the influence of reserve capacity – lateral-force-resisting mechanisms outside of the primary load path. The project includes a comprehensive integration of analyses and full-scale tests for components, connections and systems. This seminar will present selected results from this in-progress research program, including nonlinear analysis results and data from recent tests. The combined numerical and experimental evaluation provides insight into the limit states that can develop for low-ductility CBFs and illustrates potential design strategies that can be implemented to achieve adequate collapse prevention performance while still preserving the economy of the system.
Bio
Larry Fahnestock has been on the faculty of the Department of Civil and Environmental Engineering at the University of Illinois at Urbana-Champaign since 2006. He holds a B.S. (Drexel University, 1996), M.S. (Lehigh University, 1998) and Ph.D. (Lehigh University, 2006), all in civil engineering, in addition to a B.S. (Drexel University, 1996) in architectural engineering. From 1998 to 2000, Prof. Fahnestock worked as a structural engineer for the architectural and engineering firm KlingStubbins, and he is a licensed professional engineer in California and Illinois. Prof. Fahnestock has research interests in earthquake engineering, steel structures, seismic building design, connection behavior, bridge performance under service and extreme loading, progressive collapse mitigation, and large-scale testing of structural components and systems. He is a member of the American Institute of Steel Construction (AISC), the American Society of Civil Engineers (ASCE) and the Earthquake Engineering Research Institute, and he is vice-chair of the Structural Stability Research Council. His research awards include the ASCE Raymond C. Reese Research Prize (2009), an ASCE Walter L. Huber Civil Engineering Research Prize (2014) and an AISC Special Achievement Award (2016). Prof. Fahnestock teaches undergraduate and graduate courses in behavior and design of steel structures. His teaching awards include the University of Illinois College of Engineering Rose Award for Excellence (2010) and the Chi Epsilon Central District Excellence in Award (2013).
