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 | Sep 13, 2017 | News
Alpha Pre-Engineered Panel Expanding Operations To Meet Increased Demand
Alpha Pre-Engineered Panel Systems Inc. wants to expand its Clarington operation. The company manufactures raw and finished wood products for the building industry — including pre-engineered floor, wall and truss systems.
Alpha Pre owns two facilities in Clarington, one on Cigas Road and one on Baseline Road, and has approximately 170 employees.
The demand from the housing industry for Alpha Pre products means the company needs to increase production, according to a letter from Derek Frankfort, general manager of Alpha Pre-Engineered Panel Systems Inc. to Clarington council members. To increase production the company wants to build additions to both its facilities.
“Obviously, the planned expansions of both facilities will require increased plant and office personnel, and many local contractors to aid in the construction,” said Frankfort in his letter to council.
Alpha Pre wants to expand the Baseline Road plant with a 2,000-square-meter addition onto the adjacent lands to the east. The company already owns the land but needs to have it rezoned from Agricultural to General Industrial.
From DurhamRegion.com: durhamregion.com.
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by Web Editor | May 8, 2017 | News
The Sustainable Forestry Initiative Inc. (SFI) announced today that SmartLam, LLC, is the first U.S. manufacturer of cross laminated timber (CLT) to be certified to the SFI 2015-2019 Chain-of-Custody Standard. SmartLam is also the first manufacturer to produce CLT in the U.S.
SmartLam manufactures CLT for a variety of applications, including floor, roof and wall systems. SFI’s Chain-of-Custody Standard helps companies address the growing demand from governments, customers, and consumers for responsibly sourced forest products.
CLT is the next-generation of engineered wood products. Extensively tested and already widely used in Europe, CLT has vast applications for construction, industrial matting and bridging. Architects and builders choose wood because it looks great, has numerous environmental characteristics – including renewability – and it’s easy to work with. In addition, trees absorb carbon dioxide from the atmosphere as they grow, sequestering and storing the carbon while producing oxygen which reduces greenhouse gases and improves air quality.
“At SmartLam, we make CLT, but we like to tell our clients what we really sell is time. CLT increases construction speed and reduces a project’s cost and carbon footprint. Now, with certification to the SFI Chain-of-Custody Standard, we can also offer our clients supply chain assurance that our products are sourced from well-managed forests that are third-party certified to SFI’s rigorous standards,” said Casey Malmquist, President and General Manager at SmartLam.
SmartLam produces CLT at its Columbia Falls facility in Northwest Montana and is part of a global movement to use wood in tall buildings. Advances in technology are producing more engineered wood products and mass timber products that increase the capabilities of building with wood.
From PR Newswire: https://www.prnewswire.com/news-releases/smartlam-is-first-us-clt-manufacturer-to-earn-sfi-chain-of-custody-certification-300452619.html
by Web Editor | Jul 8, 2016 | News
On Dec. 26, 2015, the first EF4 or stronger tornado ever recorded in December in Texas made landfall in Garland and Rowlett, suburban towns near Dallas. APA sent a damage assessment team to the area immediately following the storm. The damage assessment team found numerous examples of severe damage, not just in the area most intensely affected by the storm, but also in areas where the tornado winds were not as intense, with damage indicators pointing to wind speeds well below the EF4 rating.
Building failures were attributed to several common structural weaknesses, including poor performance of laminated-fiber sheathing, missing metal connectors, and poor attachment of wall systems to both the roof and the foundation.
While it is challenging to design homes to withstand the most intense tornadoes, there are cost-effective design details that builders and designers can implement to significantly mitigate storm damage in less powerful winds along the edge of the storm’s path. By continuously sheathing walls with plywood or OSB and playing close attention to all connection details, builders can significantly increase the strength and resilience of their homes.
Download Texas Tornado Damage Assessment Report, Form SP-1177, including general findings, 50 images of tornado-damaged homes, and wind-resistant construction recommendations. The report is also available to purchase in print for $2.00.
From Woodworking Network: https://www.woodworkingnetwork.com/wood/apa-wood-panel-group-issues-study-how-super-strong-tornados-damage-homes
