Code Officials Vote To Advance Mass Timber Proposals

The International Code Council’s (ICC) Committee Action Hearings in Columbus, Ohio, have concluded with a clear endorsement of building codes that will enable the use of mass timber technologies in buildings ranging up to 18 stories. Though taller mass timber buildings are currently being built under various local codes, this move by the ICC ensures that model code provisions will be available to many more building officials.

Mass timber structures are generally built with large panels made of cross-laminated timber (CLT), nail-laminated timber (NLT), glue-laminated timber (Glulam) or structural composite lumber (SCL). The greater availability of CLT has provided new options for builders.

“The strength and fire resistance performance of mass timber structures is well understood and supported by substantial testing and data,” said Stephen DiGiovanni, P.E., Chair of the ICC’s Ad Hoc Committee on Tall Wood Buildings and fire protection engineer for the Clark County (NV) Department of Building and Fire Prevention. “As taller mass timber buildings become more widely deployed, it’s important that the International Building Code and the entire family of I-Codes remains at the forefront of emerging construction technologies, and continues to provide building and fire code officials with the tools they need to ensure the safety of the public and first responders.”

All buildings under the International Building Code (IBC) must meet specified fire performance standards, whether built of steel, concrete or mass timber. The 14 code provisions passed out of the ICC Committee Action Hearing established new fire resistance standards and procedures for mass timber that are more rigorous than comparable steel and concrete structures.

From Civil+Structural Engineer: https://csengineermag.com/code-officials-move-update-ibc-tall-mass-timber-buildings/

Rise Of Mass Timber Buildings Showcase Its Increasing Credibility

New mass timber products are becoming more widespread and encouraging builders, designers, and engineers to search for the best applications for mass timber initiatives. A few of the mass timber building products available today include:
• Cross-laminated timber
• Nail-laminated timber
• Glue-laminated timber
• Dowel-laminated timber

As they test the capabilities of these materials, designers are looking to existing mass timber buildings around the world for examples and inspiration.

Canadian and European researchers and architects began experimenting with the design of mass timber buildings in the 1970s. European timber projects have shown that weight matters with structural systems, and mass timber structures weigh up to one-third as much as their concrete counterparts. This fact has made wood construction a viable prospect in places where building height and weight are limited, such as city utilities, subway tunnels, and underground rail yards.

Due to their lighter weight, mass timber buildings are more resilient in seismic zones. They carry less inertia, so the possibility of destructive swaying goes down. This approach was recently applied in the Brock Commons tower, an 18-story college residence designed for the University of British Columbia by Canadian firm Acton Ostry Architects.

The 173-foot-tall tower combines glue-laminated columns, cross-laminated timber floor slabs, dual concrete cores, and steel connectors. The cores help to counteract wind-generated and seismic forces while anchoring the mass timber building in place. It meets structural and fire-safety regulations by utilizing a specially designed set of interdependent finishes and building materials.

From CRL: https://c-r-l.com/content-hub/mass-timber-buildings-credibility/

Congress Gears Up For A Fight Over Mass Timber Legislation

Congress Gears Up For A Fight Over Mass Timber Legislation

 

The battle over the 2017 Timber Innovation Act is gaining momentum in Washington, D.C., where two new Senate sponsors and four new Congress members have signed on to it since this past May. The pending legislation would provide funding for research into innovative wood materials and mass timber structures above 85 feet. The bill’s proponents are hoping that it will be an impetus for transforming cities and towns across the country with a bevy of mid-rise and high-rise mass timber buildings.

“I am very impressed with the large cross-aisle support,” Chadwick Oliver, director of Yale University’s Global Institute of Sustainable Forestry, said. “You have Bruce Westerman, a Republican congressman from Arkansas and Peter DeFazio, a Democrat from Oregon who has been on the side of environmental groups. This looks like a bill that is quite serious about moving forward.”

However, the concrete and steel industries are vigorously lobbying to derail the legislation, and have established a website called Build with Strength that contains a detailed critique of the new generation of wood buildings. “It is a piece of legislation that props up one industry over another and we think that it is misguided and dangerous,” Kevin Lawlor, a spokesperson from Build with Strength, said. “We don’t think that it is safe in three-to-five story buildings, and we don’t think that it is safer in taller buildings.”

The wood products industry, the U.S. Forest Service, and other advocates claim that technological advances make the new generation of tall timber buildings more fire resistant. In fact, according to Dr. Patricia A. Layton, director of the Wood Utilization + Design Institute at Clemson University, that is because of the way it chars in a fire: By insulating its interior, an exposed wood beam can actually be structurally stronger than a steel one. “Steel loses its strength at a lower temperature than does wood,” she explained. “If you expose concrete or steel it is combustible, and it does feel the effects of fire.”

Many of the act’s supporters say that allowing buildings to be built from wood technologies such as cross-laminated timber (CLT) will result in a host of economic and environmental benefits. Most of the Timber Innovation Act’s sponsors hail from states where the wood industry is struggling to recoup from the recent housing downturn and also suffering from the decrease in demand for paper that is a result of the increasing digitalization of the economy.

From The Architects Newspaper: archpaper.com

 

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