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Group Effects for Shear Connections with Self-Tapping Screws in CLT
| 题名： | Group Effects for Shear Connections with Self-Tapping Screws in CLT |
| 正文语种： | 英文 |
| 作者： | Afrin Hossain1; Marjan Popovski2; Thomas Tannert, M.ASCE3 |
| 作者单位： | 1Ph.D. Candidate, Dept. of Wood Science, Univ. of British Columbia, 2900-2424 Main Mall, Vancouver, BC, Canada V6T 1Z4. 2Principal Scientist, Advanced Building Systems, FPInnovations, 2665 East Mall, Vancouver, BC, Canada V6T 1Z4. 3Associate Professor, Wood Engineering, Univ. of Northern British Columbia, 3333 University Way, Prince George, BC, Canada V2N 4Z9 (corresponding author). |
| 关键词： | Cross-laminated timber; Self-tapping screws; Shear connections; Group effect |
| 摘要： | Cross-laminated timber (CLT) panels, when used as shear walls or diaphragms, are commonly connected with multiple (n) doweltype fasteners in a row. For such connections, it is frequently observed that the load-carrying capacity of multiple fasteners is less than the sum of the individual fastener capacities, a phenomenon referred to as the group effect. The research presented in this paper investigated the group effect in self-tapping screw (STS) shear connections between CLT panels. Different joint types (surface splines with STS in shear, and half-lap and butt joints with STS in either shear or withdrawal) were evaluated in a total of 175 quasi-static monotonic and reversed cyclic tests, with the number of STS in one row varied between 2 and 32. The results showed that the group effect for the joint capacity (strength) can be expressed as neff ? 0.9n for all joints under static loading, where neff is the effective number of fasteners. In case of cyclic loading, a more pronounced group effect was observed that can be expressed as neff ? n0.9. These reductions are significantly less conservative than the current Canadian design provisions for lag screws. For the reduction in stiffness and ductility, neff ? n0.8 and neff ? n0.9 can be used for all joints under static and cyclic loading, respectively. Finally, the capacity, ductility, and stiffness for joints under cyclic loading where the STS acted in withdrawal were on average 10% lower compared with the static values. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 8 |
| 页码： | 1-9 |
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