PRESENTATION – “Modelling and Design of Tall RC Core Wall Buildings” by Prof. John Wallace

Presentation

https://youtube.com/watch?v=OVjOkUU6En8

When – Wednesday 13th April 2016 //

Abstract:

Over the last fifteen years, use of alternative design approaches that use of nonlinear response history analyses (NLRHA) have become common in California. Consensus documents have been developed to help guide the alternative design process, first by the Los Angeles Tall Building Structural Design Council (LATBSDC 2005), and subsequently by the City of San Francisco (AB-083) and the Pacific Earthquake Engineering Research (PEER) Center Tall Buildings Initiative (PEER TBI, 2010). Application of NLRHA requires that elements that contribute significantly to the strength and stiffness of the building, and impact the distribution of forces and nonlinear deformations within building, be modeled. A majority of tall buildings being designed and constructed in California rely on reinforced concrete core walls and post-tensioned gravity frames as the primary lateral-force and gravity-load resisting systems, respectively; therefore, important modeling considerations include describing the force-deformation behavior of structural walls, coupling beams, slab-beam outriggers, and transfer diaphragms. The presentation will provide a brief overview of modeling approaches commonly used for coupling beams and slab-beam outriggers, and then focus on modeling approaches for, and deformation capacity of, structural walls. Of particular interest is the shear behavior and modeling. Results from laboratory tests of flexure-controlled walls with low, moderate, and high levels of shear stress demands will be presented to assess wall deformation capacity as well as modeling approaches that incorporate interaction between nonlinear axial-bending behavior and shear behavior (shear-flexure interaction).

Bio:

John Wallace, professor of civil engineering at the University of California, Los Angeles (UCLA) since 1996, is an internationally recognized expert on the seismic behavior of reinforced concrete structures. His research contributions focus on assessing the behavior of structures subjected to earthquake loading, laboratory and field testing of structural components and systems, developing and validating models for structural analysis and design, and applying sensors and sensor networks to measure responses and interactions between complex structural systems. He was PI of the NSF-funded NEES@UCLA Equipment Site for Field Testing and Monitoring of Structural Performance from 2000 to 2014 and he was involved as a member or leader of numerous teams conducting post-earthquake reconnaissance for the Earthquake Engineering Research Institute. Professor Wallace is active as a consultant and peer reviewer on high-profile performance-based design projects for seismic retrofit of hospitals and seismic design of tall buildings in California. He was a primary author of updated provisions for rehabilitation of existing concrete buildings in ASCE 41-06 Supplement #1 and he has developed code provisions for new buildings as a voting member of ACI 318 and as a former voting member of ASCE 7 Seismic Task Committee. He is a member and past-President of the Los Angeles Tall Buildings Structural Design Council. Dr. Wallace, who is a Fellow of the American Concrete Institute and the American Society of Civil Engineers, received a BS in Civil Engineering from the University of Vermont and MS and PhD in Civil Engineering from the University of California, Berkeley.

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