工程防灾减灾学术讲坛

报告题目：Component Tests, Fracture Simulation, and Seismic Collapse Assessment of a Braced Frame with Stainless Steel Dampers

报告人：希腊帕特雷大学Theodoros L. Karavasilis教授

报告时间：2022年10月13日（周四）,  15: 00-16: 00

线上报告：腾讯会议（457465153）

主持人：十大体育外围平台网址土木工程系 王斌 教授

资助项目：科技部外专创新人才交流项目

主办单位：十大体育外围平台网址土木工程系、十大体育外围平台网址灾后重建与管理学院、十大体育外围平台网址中国西部抗震防灾研究中心、四川省土木建筑学会工程韧性防灾专业委员会

报告内容： The seminar will present a dual system that consists of a moment-resisting frame equipped with dissipative concentric braces. The dissipative braces are realized as the in-series connection of stainless steel pins (SSPs) with hourglass shape, conventional steel braces, and friction pads. The latter are activated only under very large seismic intensities to control the peak force of the braces. Moreover, replaceable ductile fuses are used in the beams at the expected locations of plastic hinges. Incremental dynamic analyses are performed using an advanced finite element model in Abaqus that simulates geometric and material nonlinearities including ductile fracture in the SSPs. The cyclic behaviour of the SSPs is experimentally evaluated by testing two full-scale specimens in a configuration reproducing their actual connection details in the steel frame. The results of fourteen cyclic tests show that the SSPs have stable symmetric hysteresis, high post-yield stiffness, and large energy dissipation and fracture capacities. Ductile fracture in SSPs is modelled using a plastic motion-based criterion that is calibrated against the experimental results. The results of incremental dynamic analyses show that the proposed system has superior resistance against seismic collapse, with a 1.2% collapse probability under the maximum-considered earthquake. The large collapse capacity is due to the high post-yield stiffness and the excellent fracture capacity of the SSPs.

报告人简介：Prof. Karavasilis leads the Steel Structures Research Group at the University of Patras. Previously he was Professor (Chair in Structures and Structural Mechanics) in the Faculty of Engineering and the Environment of the University of Southampton. He also served as Associate Professor (2013-2016) and Assistant Professor (2011-2013) in Structural Engineering in the School of Engineering of the University of Warwick (UK); as Departmental Lecturer in Civil Engineering (2010-2011) in the Department of Engineering Science of the University of Oxford (UK); and as Post-Doctoral Research Associate (2007-2010) in the ATLSS (Advanced Technology for Large Structural Systems) Research Center of Lehigh University (USA). He is expert in Structural Resilience with a particular focus on Steel and Steel-Concrete Composite Buildings and Bridges under extreme hazards. In parallel with his academic duties, he is extensively involved in design of real structures and has recently completed demanding design projects such as seismic retrofit of vulnerable reinforced-concrete buildings, design of steel buildings with complex geometry and large spans, steel wind turbines, and cable-stayed steel footbridges. He is particularly interested in transferring research results and emerging technologies (damping devices, self-centering systems, demountable systems etc) in practice.