Performance-Based Wind and Earthquake Design Frameworks
for Tall Wood-Concrete Hybrid Buildings

NHERI Lehigh Seminar Series
February 27, 2020 | 4pm-5pm EST

Abstract

A rapid growth of urban populations and associated environmental concerns are challenging city planners and developers to consider sustainable building systems. In response, with new CLT and glulam timber technology, mid-and high-rise timber buildings are becoming attractive solution. Current prescriptive design approaches in the NBCC-2015, however need additional provisions to cover the unique design challenges posed by such tall timber-based hybrid buildings. These challenges span from: a lack of seismic force modification factors calibrated with the notion of collapse risk, to a lack of wind design guidelines to satisfy the serviceability and strength criteria.

In the first part of the talk, the current state-of-the-art in timber-based hybrid systems (e.g., timber-steel and timber-concrete) together with ongoing design and research challenges will be presented.

The second part of the talk will focus on findings of a recently completed project sponsored by the Forestry Innovation Investment's (FII) Wood First Program. In the project, new force modification factors to supplement the NBCC 2015 are developed using the FEMA P-695 collapse risk approach. These factors will be presented together with the associated collapse risks obtained through nonlinear dynamic analysis. It will highlight the rigorously selected ground motions for Vancouver related seismicity in congruence with the 2015 NBCC code.

Tall timber-based hybrid buildings with wood panels for lateral and gravity systems seldom experience deflection related serviceability problems. The last part of this talk will highlight: results of the aerodynamic and aeroelastic wind tunnel tests carried out 10-, 15-, 20-, 30-, and 40-stories models of hybrid tall wood building models, and some mitigation strategies to reduce the wind induced peak floor accelerations.

More information can be found in the following report: https://open.library.ubc.ca/cIRcle/collections/facultyresearchandpublications/52383/items/1.0380777

About The Author

Dr. Solomon Tesfamariam, Professor, The University of British Columbia
Dr. Solomon Tesfamariam is a professor of structural and earthquake engineering at the UBC in Okanagan Campus. He received his B.Sc., M.A.Sc., and Ph.D. in Civil Engineering from Ryerson University, University of Toronto and Ottawa University, respectively. Prior to joining UBC, he has worked for seven years at the National Research Council Canada on developing different decision support tools for infrastructure management, and analytical and numerical based modelling of pipe failures. At UBC, his research interests lie primarily in the design and protection of civil infrastructure/structural systems from multiple hazards (earthquake, wind, fire, etc.). His research philosophy is working on integrated risk analysis and management for civil infrastructure systems. Over the last ten years, funded through NSERC, FPInnovations and Forestry Innovation Investment, he has lead a research group on developing design guidelines for timber-based hybrid structures under wind and earthquake loads.

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