Cross laminated timber (CLT) diaphragms under shear: Test configuration, properties and design
Cross laminated timber (CLT) diaphragms under shear: Test configuration, properties and design
复制标题
剪切下的交叉层压木材 (CLT) 隔膜：测试配置、特性和设计
DOI：
10.1016/j.conbuildmat.2017.04.153
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发表时间：
2017
影响因子：
7.4
通讯作者：
M. Sieder
中科院分区：
文献类型：
--
作者：
R. Brandner;P. Dietsch;Julia Dröscher;M. Schulte;H. Kreuzinger;M. Sieder
正交结构的交叉层压木材（CLT）的隔板在剪切下可能会导致三种可能的剪切破坏机制：（i）总剪切（窄面粘接层压板的情况下），（ii）净剪切和（iii）扭转。虽然抗扭性已经得到了全面的研究，但面内总剪切强度和净剪切强度的确定仍然是一项具有挑战性的任务。而总剪切性能提出了类似于胶合木，净剪切只有来自测试单一CLT节点的性能可用。对这些方法进行全面的CLT要素的验证尚待确认。我们的目的是验证相应的新的测试配置的适用性。为了实现这一目标，并评估净和总剪切强度和模量，进行了一项实验研究，包括总共23个系列，具有不同的参数设置。在此过程中，观察到了测试配置的操作效率以及所有测试CLT元件的可靠剪切破坏。关于进行的参数研究，结果定性对应于单个CLT节点上的测试。间隙执行和层厚度被证实是显着影响面内剪切性能的主要参数。根据积累的经验，提出了特征剪切性能和结论性的设计概念。
The orthogonal structure of cross laminated timber (CLT) diaphragms under shear can cause three possible shear failure mechanisms: (i) gross-shear (in case of narrow-face bonded laminations), (ii) net-shear and (iii) torsion. While the resistance against torsion has been investigated comprehensively, the determination of in-plane gross- and net-shear strength remains a challenging task. Whereas gross-shear properties are proposed in analogy to glulam, for net-shear only properties derived from testing single CLT nodes are available. The verification of these approaches for full CLT elements has yet to be confirmed. We aim on verifying the applicability of a corresponding novel test configuration. For this aim and for evaluation of net- and gross-shear strength and modulus, an experimental study comprising in total 23 series featuring different parameter settings was conducted. In doing so, the operational efficiency of the test configuration together with reliable shear failure of all tested CLT elements was observed. With regard to the conducted parameter study, results qualitatively correspond with tests on single CLT nodes. Gap execution and layer thickness are confirmed to be the main parameters significantly influencing in-plane shear properties. Based on gathered experiences, characteristic shear properties and a conclusive design concept are proposed.