Cross laminated timber (CLT): Design approaches for dowel-type fasteners and connections
Cross laminated timber (CLT): Design approaches for dowel-type fasteners and connections
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DOI：
10.1016/j.engstruct.2018.05.032
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发表时间：
2018-09
影响因子：
5.5
通讯作者：
A. Ringhofer;R. Brandner;H. Blass
中科院分区：
文献类型：
--
作者：
A. Ringhofer;R. Brandner;H. Blass
在过去的20年里，交叉层积材（CLT）已成为当代木材工程中最重要的建筑产品之一。到本十年结束时，其全球年产量预计将超过1，000，000立方米。工业界、工程师、建筑师和施工人员对在欧洲产品、设计和执行标准中实施CLT有着浓厚的兴趣。CLT的设计是目前正在进行的欧洲规范5修订的一部分。在这种情况下，除了验证CLT面板的极限和正常使用极限状态，CLT与销型紧固件连接的设计指南是最重要的。在这篇文章中，我们回顾了文献中提供的用于计算CLT中单个销型紧固件和连接的特征值的方法。我们还比较了这些方法，重点是榫钉，钉子和自攻螺钉的拔出和嵌入强度，与欧洲规范5中制定的实心木材和胶合木的榫钉型紧固件的现行规定。这些比较是为了确定需要和潜在的修改目前的EC 5方程和国家的最先进的法规。我们总结了有关连接设计的规定，即最小间距、边缘和端部距离、其他附加几何条件、一组紧固件的有效数量和最小穿透深度的规定。最后，对单扣件的拔出性能和嵌固强度进行了分析，并提出了一些施工指导意见，以保证CLT结构的完整性。总的来说，我们的目标是提出一个汇编的当前国家的最先进的知识在CLT销型紧固件的基础上实施CLT的设计指南，在欧洲规范5的新连接章节。
Within the last 20 years, cross laminated timber (CLT) has become one of the most important building products in contemporary timber engineering. By the end of this decade, its annual worldwide production volume is expected to exceed 1,000,000 m3. The industry, engineers, architects and constructors have a strong interest in implementing CLT in European product, design and execution standards. The design of CLT is part of the currently ongoing revision of Eurocode 5. In this context and in addition to the verification of CLT panels in respect of ultimate and serviceability limit states, guidelines on the design of connections in CLT with dowel-type fasteners are of the utmost importance.In this article, we review approaches for calculating characteristic values as provided in literature for single dowel-type fasteners and connections in CLT. We also compare these approaches, with focus on withdrawal and embedment strength of dowels, nails and self-tapping screws, with the current regulations on dowel-type fasteners for solid timber and glulam as formulated in Eurocode 5. These comparisons are made in order to identify the need and potential for revision of current EC 5 equations and state-of-the-art regulations. We summarise regulations on connection design, i.e. minimum spacing, edge and end distances, other additional geometrical conditions, regulations on the effective number of fasteners in a group and minimum penetration depths. Finally, we draw conclusions in respect of the single fastener properties withdrawal and embedment strength and suggest some execution guidelines, which ensure the integrity of CLT structures. Overall, we aim to present a compilation of the current state-of-the-art knowledge on dowel-type fasteners in CLT as a basis for implementing design guidelines for CLT in the new connection chapter of Eurocode 5.