正交胶合木新型抗剪及抗拉连接耗能特性试验

Experimental Study on Energy Dissipation Capacity of Novel Dissipative Connections for CLT Structures

摘要:

连接节点是保证木结构抗震性能的重要因素，节点的耗能能力是衡量其是否适用于抗震区的重要指标。提出了适用于正交胶合木（cross laminated timber， CLT）结构的新型耗能抗剪连接节点和新型耗能抗拉连接节点，为研究该类连接节点的破坏模式及力学性能，开展了15组低周往复加载试验。试验结果表明，新型耗能连接节点试件延性系数（D）均大于9.0，满足欧洲规范Eurocode 8中对高延性节点D >6的要求，属于高延性范围；新型耗能连接节点工作阶段强度退化系数均低于20%，具备工程适用性；新型耗能连接节点工作阶段等效黏滞阻尼系数为12%~22%，普通商用连接节点等效黏滞阻尼系数为2.5%~15.8%，两类新型耗能连接节点具有较好的耗能能力。

关键词:正交胶合木;新型连接节点;耗能特性;力学性能;破坏模式

Abstract:

Connections are essential in ensuring the seismic performance of timber structures， and the energy dissipation capacity of connections is an important index to measure the serviceability of connections for earthquakes. In this paper， the novel dissipative angle bracket and hold-down for cross-laminated timber（CLT） structures were proposed. Fifteen sets of cyclic loading tests were conducted to evaluate the failure mechanisms and mechanical properties of these connections. Almost all the tested specimens have a ductility larger than 9.0， meeting the requirements of Eurocode 8 for high ductility connections with D>6， and belonging to the high ductility class. The strength degradation of the novel dissipative connections in the working stage less than 20%， indicating the engineering applicability of the novel connections. The equivalent viscous damping ratio of the novel dissipative connections in the working stage is 12%~22%， and that of the common commercial connections is 2.5%~15.8%， indicating the high energy-consuming capacity of the novel connections.

Key words:cross-laminated timber(CLT);novel connection;energy dissipation characteristics;mechanical property;failure mechanism