Li Mingfei, Wu Mingtao, Guo Nan, Mei Lidan, Zhao Yan
College of Civil Engineering, Northeast Forestry University, Harbin 150000, China.
College of Civil Engineering and Architecture, Wuyi University, Wuyishan, Nanping 354300, China.
Materials (Basel). 2021 Oct 29;14(21):6494. doi: 10.3390/ma14216494.
An anchorage device is an integral part of the prestressed Glulam beams. Therefore, its rationality and practicability have significant effects on the mechanical performance of the prestressed beams. To investigate the impact of the anchorage devices on the bearing capacity and stiffness of the prestressed beams, this paper compared and analyzed four kinds of anchors in detail through the finite element software. The results showed that when the initial mid-span deflection was 5 mm, 10 mm, and 15 mm, the bearing capacity of prestressed beams with four anchorage devices was 80.37-177.24%, 93.56-182.51%, and 95.62-194.60% higher than that of ordinary Glulam beam, respectively. When the initial mid-span top prestresses were 1 MPa, 1.5 MPa, and 2 MPa, the bearing capacity of prestressed beams with four anchorage devices was 101.71-172.57%, 105.85-175.88%, and 109.64-180.87% higher than that of ordinary Glulam beam, respectively. In addition, based on the simulation results, the prestressed beam with the external anchorage had the highest bearing capacity and stiffness. The deformation capacity of the beam with boot anchorage was the largest. The stress distribution of the beam installed under beam anchorage was the most uniform, and the beam with slotted anchorage was easy to cause stress concentration at the notch. Finally, based on the outstanding performance of the external anchorage, it was selected to carry out one experiment, and the experimental result showed that the simulation could predict the damage model and load-deflection relationship of the prestressed beams well.
锚固装置是预应力胶合木梁的一个组成部分。因此，其合理性和实用性对预应力梁的力学性能有显著影响。为了研究锚固装置对预应力梁承载力和刚度的影响，本文通过有限元软件详细比较和分析了四种锚具。结果表明，当初始跨中挠度为5mm、10mm和15mm时，采用四种锚固装置的预应力梁的承载力分别比普通胶合木梁高80.37 - 177.24%、93.56 - 182.51%和95.62 - 194.60%。当初始跨中顶部预应力为1MPa、1.5MPa和2MPa时，采用四种锚固装置的预应力梁的承载力分别比普通胶合木梁高101.71 - 172.57%、105.85 - 175.88%和109.64 - 180.87%。此外，根据模拟结果，外置锚固的预应力梁承载力和刚度最高。靴式锚固梁的变形能力最大。梁式锚固下安装的梁应力分布最均匀，开槽锚固梁在槽口处易产生应力集中。最后，基于外置锚固的优异性能，选择其进行了一项试验，试验结果表明模拟能够很好地预测预应力梁的破坏模式和荷载-挠度关系。
