Fire Performance of Timber-Concrete Composite (TCC) Systems in Mass Timber Buildings

大体积木结构建筑中木-混凝土复合材料 (TCC) 系统的防火性能

• 批准号: RGPIN-2021-04076
• 负责人: Salem, Osama
• 金额: $ 1.89万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749417
• 关键词: Fire; Performance; Timber; Concrete; Composite

In a new era full of possibilities for manufacturing large timber sections made of engineered wood, i.e., glued-laminated timber (glulam), cross-laminated timber (CLT) and nailed-laminated timber (NLT) sections, strength and structural integrity of such sections can be retained for much longer time in fire. As a result, several tall buildings made primarily of timber are increasingly being constructed worldwide. Floor systems in such buildings can even be made stronger and span longer distances to allow designers greater versatility in terms of floor plan and promote for open concept design in modern buildings by adding a top layer made of concrete that allows the formation of Timber-Concrete Composite (TCC) floor systems with the use of sufficient shear connections. In this composite system, the advantageous mechanical properties of both materials are efficiently utilized and thus, several advantages can be achieved for a more robust floor system, if compared to timber floors such as those made solely of CLT or NLT panels. Among the several advantages of utilizing TCC floor systems are greater strength, durability, and much improved acoustics and vibration performance characteristics. Unfortunately, experimental work on TCC systems in fire conditions is not as extensive as at ambient temperature, and thus one very important area that warrants further investigation is the behaviour of TCC floor systems in fire conditions with focus on certain aspects. For instance, most previous experimental studies on TCC floor systems were of small size, small number and/or representing one-way floor assemblies; whereas in the proposed research program, twenty-four (24) large-scale two-way TCC slab-type floor assemblies utilizing CLT and NLT panels will be examined in fire conditions. Also, it is very rare to find research studies that address the effect of inter-panels joint connections on the structural fire behaviour of TCC floor systems, and thus those test assemblies with CLT panels will include spline panel-to-panel connections. In addition, the use of a supporting framing system made of glulam beams along the perimeter of the TCC floor slab to enhance the membrane action of the concrete slabs in fire is something that has never been presented in the available literature so far. Therefore, it is believed that the proposed research program will lead to: development of new and reliable experimental data and possible implementation of design models for TCC slab-type floor systems in fire conditions in the future version of CSA O86 standard (scientific impact); development of FE models that can simulate the actual behaviour of those TCC floor assemblies with the selected shear connections in fire conditions (technological impact); indirectly support the Canadian wood industry through the development of new design models (economic impact); and allow more robust, sustainable material-made, and fire safe mass timber buildings for Canadians (social impact).

在一个新时代，充满了制造由工程木材制成的大型木材截面的可能性，即胶合层的木材（Glulam），跨层压木材（CLT）和钉覆盖的木材（NLT）截面，此类部分的强度和结构完整性可以保留更长的时间。结果，几座主要由木材制造的高建筑物越来越多地在全球范围内建造。 Floor systems in such buildings can even be made stronger and span longer distances to allow designers greater versatility in terms of floor plan and promote for open concept design in modern buildings by adding a top layer made of concrete that allows the formation of Timber-Concrete Composite (TCC) floor systems with the use of sufficient shear connections.在此复合系统中，如果与仅由CLT或NLT面板制成的木地板相比，这两种材料的优势机械性能都可以有效地利用，因此，对于更健壮的地板系统，可以实现多种优势。使用TCC地板系统的几个优势是，强度，耐用性以及更高的声学和振动性能特征。 不幸的是，在火灾条件下对TCC系统的实验性工作不如周围温度那样广泛，因此要进一步研究的一个非常重要的领域是TCC地板系统在火灾条件下的行为，侧重于某些方面。例如，大多数关于TCC地板系统的实验研究的大小很小，数量较小和/或代表单向地板组件。在拟议的研究计划中，将在火灾条件下使用CLT和NLT面板进行二十四（24）个大规模的双向TCC平板型地板组件。同样，很少有人能找到研究板间关节连接对TCC地板系统结构火行为的影响的研究，因此，那些带有CLT面板的测试组件将包括样条面板与面板连接。此外，沿着TCC地板板的周长制成的支撑框架系统来增强火炉中混凝土板的膜作用，这是迄今为止在可用文献中从未出现过的。因此，据信，拟议的研究计划将导致：开发新的可靠的实验数据，并在未来版本的CSA O86标准（科学影响）的火灾条件下，在火灾条件下为TCC平板型地板系统的设计模型实施；开发Fe模型，可以模拟这些TCC地板组件的实际行为，并在火灾条件下使用选定的剪切连接（技术影响）；通过开发新设计模型（经济影响）间接支持加拿大木材工业；并为加拿大人（社会影响）允许更健壮，可持续的材料制造和防火安全的大规模木材建筑。