skip to Main Content

MATERIALS GUEST SPEAKERS

RESILIENT WOOD BUILDINGS FOR COMMUNITY RESILIENCE TO NATURAL HAZARDS

Date: May 27th, 2021
Time: 3:00pm (EST)

Natural hazards such as earthquakes and tornadoes result in extraordinary loading to buildings and other physical infrastructure. Over the last 15 years wood and wood products have evolved to take these hazards head-on and enable better performing buildings. As buildings are designed to be taller and more versatile they continue to be expected to perform better and maintain functionality following events such as a design level earthquake or even a small tornado. This presentation will begin with past light-frame wood whole-building shake table tests around the world, focusing on challenges of height and the logical move for North America to mass timber. Moving from performance-based engineering to concepts and the practice of resilience where engineering merges with social, economic, and information science. Resilient buildings and physical infrastructure are a necessary component to achieve urban resilience to earthquakes and other natural hazards thereby supporting social and economic institutions within a community. This concept will be illustrated using a retrofit example for tornado loading across a community for light-frame wood residential buildings. Finally, coming full circle to earthquake engineering, the concept of tall post-tension rocking wall buildings where the shear forces are decoupled from vertical floor motion will be presented as a means to achieve resilient tall wood buildings in high seismic regions of the world.

SPEAKER

john-vdl

Dr. John W. van de Lindt –Department of Civil and Environmental Engineering at Colorado State University

Dr. John W. van de Lindt is the Harold H. Short Endowed Chair Professor in the Department of Civil and Environmental Engineering at Colorado State University. He has conducted nearly 50 research projects related to buildings and other systems related to earthquakes, hurricanes, tsunamis, tornadoes and floods. Van de Lindt led both the NEESWood and NEES-Soft project teams between 2005-2013 which consisted of two-story, four-story, and six-story shake table tests on the world’s largest shake tables, serves on ASCE’s Executive Committee for the Infrastructure Resilience Division and SEI. Recently, he led the effort to develop seismic performance factors (R-factor) for U.S. building codes. Van de Lindt serves as the Co-director for the National Institute of Standards and Technology-funded Center of Excellence (COE) for Risk-Based Community Resilience Planning headquartered at Colorado State University. The NIST COE is a 14-university collaboration developing the computational resilience environment IN-CORE and engaging partner communities. He has published more than 400 technical articles and reports including more than 200 journal papers, served on a number of editorial boards, and serves as the Editor-in-Chief for the Journal of Structural Engineering.

RECENT CANADIAN DEVELOPMENTS RELATED TO FRP REINFORCEMENT FOR CONCRETE STRUCTURES, DESIGN CODES, AND APPLICATIONS IN BUILDINGS AND BRIDGES

Date: May 28th, 2021
Time: 10:00am (EST)

The design principle of fiber-reinforced polymer (FRP) reinforcing bars for concrete structures has been well established through extensive research and field practices. Provisions governing certification testing and evaluation as well as quality control/assessment and FRP design provisions, are now in place to regulate materials specifications and design aspects and guide FRP manufacturers and end-users. The Canadian Standards Association (CSA) group addressing the state-of-the-art FRP material specifications and design requirement recently issued two updated provisions. The new edition of CSA S807 includes several additions and modifications in terms of quality and qualification requirements, material properties, testing procedures, and material mechanical and durability limitations. Additionally, the updated Section 16 of CSA S6 for the design of fiber-reinforced structures and highway bridges aimed at providing more rational design algorithms and allowing practitioners to take full advantage of the efficiency and economic appeal of FRP bars. A summary of these recent modifications in Canadian codes and standards, introducing the underlying rationale is presented. Additionally, the presentation highlights the recent Canadian developments and properties of new FRP bars and the recent field applications of FRP bars in buildings and bridges.

SPEAKER

brahim-benmokrane

Brahim Benmokrane, PhD, PEng, FRSC, FACI, FCSCE, FIIFC, FCAE, FEIC, FBEI – University of Sherbrooke

Professor Brahim Benmokrane is one of the world’s top in the field of structural concrete internally reinforced with fiber-reinforced polymer (FRP) reinforcement. He holds the Tier–1 Canada Research Chair in Advanced Composite Materials for Civil Structures and the NSERC Industrial Research Chair in Innovative FRP Reinforcement for Sustainable Concrete Infrastructures at the Department of Civil and Building Engineering at the University of Sherbrooke (Sherbrooke, QC, Canada). His research has significantly influenced the development of concrete structures reinforced with FRP bars, building codes, design specifications, and their practical use in North America and beyond. He is a Fellow of the Royal Society of Canada (Academy of Science), CSCE, ACI, CAE, IIFC, EIC, BEI. He received the NSERC Synergy Award for Innovation, CSA Medal of Merit, Conmat’15 Lifetime Achievements Award, CSCS’s P.L. Pratley Award, Grand Prix d’Excellence of the Order of Professional Engineers of Quebec, Julian C. Smith Medal of the Engineering Institute of Canada for Achievement in the Development of Canada, and the IIFC Medal of the International Institute in FRP for Construction. Professor Benmokrane has published over 650 papers, books, and book chapters and delivered over 250 lectures worldwide. As one of the world’s most cited scientists in the field (13500+ citations, h-index = 63, i10 index = 230 by Google Scholar), he leads a research group of 32 and has trained 168 researchers. More than 30 of his former students and postdoctoral researchers now hold faculty positions in Canada and abroad. Over the last 25 years, Professor Benmokrane has worked with Canadian and international companies and governments. Many world firsts go to his credit in terms of bridges, parking facilities, water-treatment plants, and tunnels (e.g., FRP use in the Nipigon Cable Stayed Bridge, Highway 40 & Champlain Bridge (Montreal), TTC Subway North Tunnels (Highway 407) (Toronto), Port of Miami Tunnel (US), and Port of Tanger Med II (Morocco).

PATHWAY TO A SUSTAINABLE AND DURABLE INFRASTRUCTURE

Date: May 28th, 2021
Time: 3:00Pm (EST)

There is a pressing need to enhance the sustainability and durability of our infrastructure. Concrete structures are deteriorating at a much faster rate than expected resulting in a massive need for repairs and premature replacement and costing billions of dollars annually. Deterioration is caused by mechanical loading conditions and expansive deterioration processes (corrosion, frost action, alkali-silica reaction, and sulfate attack) which create tensile stresses that eventually lead to crack formation. Cracks in concrete due to expansive deterioration processes initiate as small microcracks. Once these microcracks become interconnected and form macrocracks ingress of water and aggressive ions is enhanced and the deterioration process accelerated. In order to enhance the service life of concrete structures, the concrete needs to be designed in such a way that it complies with certain performance criteria such as crack resistance, high durability, and deflection or tension hardening behavior. The presentation will focus on a performance based materials approach referred to as Deterioration Reduction through Multi-scale crack Control (DRMC) to enhance the durability and service life of concrete structures. The DRMC approach is a holistic approach and provides multiple lines of defense against damage due to both mechanical and environmental loading conditions by reducing the rate of damage initiation and damage propagation. It concentrates on cracking which is common to all deterioration processes independent of their reactants. Hence, it differentiates itself from the traditional approach which treats each deterioration process in isolation and proposes different remedies for each expansive deterioration mechanism.

SPEAKER

claudia-ostertag

Claudia P Ostertag, PhD – University of California, Berkeley

Professor Ostertag is the Vice-Chair of the Civil & Environmental Engineering Department at the University of California, Berkeley, and the recipient of the T.Y. Lin Endowed Chair of Engineering. She received her MS degree from the University of Stuttgart, Germany and her PhD from the University of California, Berkeley. Professor Ostertag’s career spans many institutions including the National Institute of Standards and Technology in Gaithersburg, MD and the Max Planck Institute in Stuttgart, Germany. Her research areas focus on microstructural engineering of high performance materials, damage characterization, durability of reinforced concrete structures, and performance enhancement of reinforced concrete structures through the use of high performance materials. Her most recent research areas include the fabrication and development of 3D printed metamaterials for structural applications. Prof. Ostertag is also actively involved in earthquake disaster mitigation of low cost residential structures in third world countries. She received various research awards (Outstanding Journal Paper Awards, NIST Director’s award, DOE Award, CAREER Award, UC Berkeley Faculty Research Award, IMSE Innovation Award etc.) for her pioneering work in high performance fiber reinforced composites.

Back To Top