To be held on Monday, December 28th, 2020, 12:10-13:00
via zoom meeting - link
Behavior of Precast Beam-to-Column Connections under cyclic loading: Experimental & Analytical Study
Dr. Mustafa Mahamid
Research Associate Professor, Department of Civil, Material and Environmental Engineering, University of Illinois at Chicago
Seismic performance of a specific type of moment resisting precast concrete beam-column connection was investigated through reversed cyclic load tests. Structural steel components were incorporated with precast concrete beam and column elements in the experiments to provide a ductile moment -resisting connection. Nonlinear finite element analysis (FEA) of typical monolithic and precast connections was performed to investigate the performance and failure modes of these connections. Concrete Damage Plasticity (CDP) model was used to capture nonlinearities in concrete under cyclic loading. Good agreement was achieved between experimental and numerical results, which indicates that the finite element model is capable of capturing failure modes of the investigated precast connections. Agreement between the experimental and numerical behaviors was valid in terms of both the global load-displacement response as well as the local response, such as the force within connection rods and the beam curvature. Comparison of the performance of precast concrete connections with the companion monolithic connections indicates that the investigated connection method offers the potential to provide an acceptable seismic performance. Behavior of the precast concrete connection was influenced significantly by the anchorage detail used for steel connection plates and the beam reinforcement detailing in the vicinity of the connection. Simple detailing modifications resulted in major improvements in the performance of connection in terms of strength, stiffness and energy dissipation characteristics.
About the speaker:
Currently a visiting lecturer at the Technion, Israel Institute of Technology, a Research Associate Professor at the University of Illinois at Chicago. He worked as a structural engineer at GRAEF and Skidmore, Owings & Merrill (SOM) in Chicago. His designs include a wide variety of projects, including healthcare, commercial, residential, industrial, and high-rise buildings located in the U.S., Europe, Middle East, and China.
Dr. Mahamid is a Fellow of ASCE (F.ASCE), ASCE's Structural Engineering Institute (F.SEI) and ACI (F.ACI) in recognition of his contributions to the profession. He served on several technical committees sponsored by ACI and ASCE/SEI including ASCE 7 and the seismic subcommittee of ASCE 7; he is the chair of the Reinforced Concrete Slab ACI-ASCE joint committee (ACI-ASCE 421). He authored and coauthored numerous journal and conference papers; he is the editor and co-author of the Structural Engineering Handbook 5th edition and for the new book on Cross-Laminated Timber Design, and he is an associate editor for the ASCE Practice Periodical on Structural Design and Construction Journal.
Dr. Mahamid's design and research areas and interest include behavior of steel structures with the focus on steel connections for seismic applications, behavior of concrete structures with the focus on reinforced concrete joints and connections for seismic applications and fire structural engineering. He is a licensed Structural Engineer (SE) in the State of Illinois and Professional Engineer (PE) in California, Washington, Wisconsin, Michigan, and Massachusetts, a Professional Engineer (P.Eng.) in Newfoundland and Labrador in Canada and registered Civil Engineer in Israel.