Advocates for a code change that would allow taller heavy-timber frames are buoyed by the good performance of mass-timber structures in the first U.S. fire tests on full-scale furnished apartments.
内华达州克拉克县建筑和消防部的消防工程师斯蒂芬·迪格瓦尼（Stephen DiGiovanni）说：“测试进行了预期。”
DiGiovanni也国际主席鳕鱼e Council’s 17-member ad hoc committee for tall wood buildings, plans to use the final test report to help justify a code change that would allow wood frames as tall as 180 ft, depending on building design and use.
The report is due out before Jan. 8, the deadline for code-change proposals for the 2021 edition of the International Building Code. IBC currently limits the height of heavy-timber structures to 85 ft.
在可能更换的代码变化建议下，完全受到不可固定护套保护的大量木材的最大高度将为180英尺。大量木材的高度为120英尺，大部分受到不可固定的护套的保护，但暴露了一定百分比的暴露墙壁和天花板。Digiovanni说，完全裸露的大量木材的最大高度可能会保持在85英尺。
The ICC committee provided the five fire scenarios tested in the two stacked and identical one-bedroom apartments, each 30-ft square in plan. Tests were conducted at the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives Fire Research Laboratory.
Funding for the research is from the U.S. Dept. of Agriculture’s Forest Products Laboratory and the American Wood Council (AWC), which supports wood-product manufacturing.
成本细节未发布。但是，森林产品实验室项目负责人塞缪尔·泽林卡（Samuel Zelinka）表示，费用将约为500,000至100万美元。大部分资金来自AWC，AWC支付了Lendlease来建造和修复测试标本。
标本的结构由胶合层的木梁梁和跨层压的木制墙壁和地板系统组成。所有垂直承载的CLT（7英寸厚）位于外部。
One level was tested at a time, says Zelinka. The fire load was 570 MJ/m².
在第一次测试中，研究人员对大型尺寸的结构进行了大规模测试结构，并用5⁄8英寸厚的石膏壁板进行了大型家具和炮弹的火力。三个小时后，测试结束了，没有在受保护的木表面上进行明显的炭化。
在接下来的四小时测试中，暴露了客厅和卧室的CLT天花板区域的30％。一旦大火消耗了家具和物品，裸露的CLT基本上是由于表面char的形成而自我脱落的。
第三个测试暴露平行CLT walls, one in each room, to the fire. Again, mass-timber surfaces essentially self-extinguished due to the formation of char. In most cases, the char did not move past the first ply of the five-ply CLT, says Zelinka.
Tests Nos. 4 and 5 examined the effects of sprinkler protection on exposed mass-timber surfaces in both rooms. In the fourth test, a single sprinkler, operating normally, easily contained the fire. For the last test, the fire was allowed to grow in the compartment for 23 minutes before water was supplied to the sprinklers. The sprinklers quickly controlled the fire, which Zelinka says was the “most surprising” positive result in the test series.
他补充说，在所有测试的条件下，CLT表现“很好”。
Digiovanni说，这些测试“达到相同的结果”，与为12层框架建筑进行的组装火灾测试（在俄勒冈州波特兰市建造）（ENR 10/24/16p。24）。新利18备用他说，但是框架测试“是专有的，具体的”。“我们是通用的，并且会有更广泛的应用。”
