by Web Editor | May 22, 2018 | News
USDA Forest Service Interim Chief Vicki Christiansen recently announced the award of almost $8 million to expand and accelerate wood products and wood energy markets. The Wood Innovation Grants will stimulate the removal of hazardous fuels from national forests and other forest lands to reduce the risk of catastrophic wildfires, promote forest health, and reduce the cost of forest management. The investment of federal funds will leverage over $13 million in matching funds from 33 business, university, nonprofit, and tribal partners in 20 states for a total investment of over $21 million.
“These Wood Innovation grants advance state-of-the-art solutions to reducing wildfire risk and making our forests healthier and more resilient,” said Forest Service Interim Chief Christiansen. “The public-private partnerships leveraged with these grants also foster increased economic development in rural communities.”
Previous grants supported successful blast testing of cross-laminated timber (CLT) that directly resulted in the Department of Defense using CLT on its on-base hotels; and the funding of a feasibility analysis for a new CLT manufacturing facility to increase the amount of U.S.-made CLT.
This year the Forest Service received 119 proposals, demonstrating the expanding interest in using wood in both traditional and unconventional ways, such as an innovative building material and as a renewable energy source. Since 2005 more than 260 grants have been awarded to improve forest health, create jobs, invest in renewable energy, and support healthy communities.
Of the 34 projects funded in 2018, 28 focus upon expanding markets for wood products, and six seek to increase markets for wood energy. Some examples include utilizing small-diameter woody material in cross laminated timber (CLT) panels, addressing affordable housing in the northeast building market with mass timber, converting woody debris to renewable natural gas for transportation fuel, and using juniper biomass and biochar to filter heavy metals and manage storm water.
Read more on this from the USDA Forest Service at https://www.fs.fed.us/news/releases/usda-forest-service-awards-wood-innovation-grants-expand-and-accelerate-wood-products.
by Web Editor | Nov 8, 2017 | News
WoodWorks, in cooperation with the USDA Forest Service Forest Products Lab and Softwood Lumber Board, conducted a second series of blast tests on three existing two-story, single-bay cross-laminated timber (CLT) structures at Tyndall Air Force Base—the same structures involved in a series of initial blast tests performed in 2016. While a full analysis will be published early next year, on-site observations are decidedly positive. All structures remained intact under significant explosive loading well beyond their design capacity.
“Last year, we tested the structures under their own self-weight,” said Bill Parsons, VP of Operations for WoodWorks. “Those tests were successful and, this year, we built on that effort by testing whether the design methods established as a result of those initial tests needed to be adjusted when the buildings carried typical gravity loads and included different connection configurations, increased panel thickness, and alternate mass timber wall systems.”
Four tests were performed covering a spectrum of blast loads. For tests one and two, the size of the blast load and configuration of the structures were the same as prior testing, except the structures had axially-loaded front panels. The loads applied were intended to simulate conditions associated with a 5-story residential or office building. For tests three and four, different variables were altered on each of the buildings. One building used 5-ply CLT front wall panels, the second used off-the-shelf prefabricated angle brackets, and the third included nail-laminated timber (NLT) front panels. Reflected pressure, peak deflections, and panel acceleration were recorded at front and side faces in order to compare results to previous testing.
As with the tests performed in 2016, peak recorded deflections were consistent with pre-test predictions indicating the effectiveness of design assumptions and methodology in predicting elastic response of CLT to dynamic loads. The second test also indicated a controlled response in which localized panel rupture was observed but connection integrity and load carrying ability were not compromised for any of the loaded structures. Of particular note, all three structures remained standing following the fourth and largest blast, intended to take the structures well beyond their design intent. While panel rupture was expected and observed on all front and side wall panels, the buildings maintained enough residual capacity to remain intact and safe to enter.
From The Construction Specifier: https://www.constructionspecifier.com/woodworks-leads-successful-blast-testing-loaded-mass-timber-structures/
by Web Editor | Dec 19, 2016 | News
Videos are now available showing a series of live blast tests on three cross-laminated timber (CLT) structures at Tyndall Air Force Base, conducted by WoodWorks in cooperation with the US Forest Service and Softwood Lumber Board. Post-test observations were exciting. All structures remained intact and matched modeling predictions with acceptable levels of damage under significant explosive loading. The results of this testing will be used to further expand the use of wood solutions for Department of Defense applications and other blast-resistant construction. Watch the videos here: https://bit.ly/2hwVE1g
The CLT structures—each two-story, single-bay structure with anchorage to an existing concrete slab—were constructed in full by Lendlease over a period of eight days. Each structure was constructed using a different grade of CLT (i.e., grade designations V1, E1 and V4 per ANSI/APA PRG-320 provided by DR Johnson, Nordic and SmartLam, respectively) and included window and door openings (with doors provided by American Direct) consistent with an actual building. Self-drilling screws provided by MyTiCon and adhesive anchors provided by Hilti were utilized in concert with angle steel to connect the constituent panels of each structure.
Three shots were performed to demonstrate the effectiveness of CLT over a spectrum of blast loads. The first two shots were designed to stress the CLT structures to within their respective elastic limits. The third shot was designed to push the structures beyond their elastic limits such that post-peak response could be observed. Reflected pressure and peak deflections were recorded and will be used to thoroughly document the response of the structure in time, and support a design methodology for predicting elastic response of CLT under dynamic loads.
Initial observations deriving from these tests are positive. For the first two tests, peak recorded deflections were consistent with pre-test predictions, indicating the efficacy of the design assumptions and supporting design methodologies. Results from the third test indicated a controlled response in which localized panel rupture was observed but connection integrity and load carrying ability were not compromised for any of the three structures. Over the next couple months, WoodWorks will be working with Karagozian & Case, Inc. and the University of Maine to thoroughly post-process and analyze the results of these tests.
From Business Wire: https://www.businesswire.com/news/home/20161215005337/en/WoodWorks-Leads-Blast-Testing-Project-Cross-Laminated-Timber
