In this study, friction dampers (FDs) were placed at the top and bottom of a post-tensioned (PT) self-centering glulam (SCG) beam-to-column joint to dissipate earthquake energy. PT tendons were installed in two externally elongated slots at the centroid of the beam to provide the system with self-centering capacity so that the system can return to its original position after an earthquake. Theoretical and experimental analyses of the beam-to-column joint were performed to investigate the effects of various design parameters, such as the total clamping forces applied to the FDs and initial forces of the PT tendons, on the hysteretic performance of the FD-SCG joint under cyclic loading. During the tests, the backbone members (glulam beam and column) and main connecting members (PT tendons and FDs) were measured to always be within the elastic limit range. Both the theoretical and experimental results indicated that under low initial PT forces and clamping forces, the energy is dissipated primarily by FDs; in contrast, under high PT forces and clamping forces, some energy is dissipated by the glulam materials, owing to the occurrence of minor local damage in the specimen, in the direction perpendicular to the grain. Moreover, the FD-SCG joint can be suitably designed to achieve the desired stiffness, load capacity, self-centering ability, energy dissipation capability, and expected overall system response.

中文翻译：

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带摩擦阻尼器的自定心胶合梁柱接头滞回性能试验研究

在这项研究中，摩擦阻尼器 (FD) 被放置在后张 (PT) 自定心胶合 (SCG) 梁柱接头的顶部和底部，以消散地震能量。PT筋安装在梁质心的两个外部细长槽中，为系统提供自定心能力，使系统在地震后能够恢复到原来的位置。对梁柱接头进行了理论和实验分析，以研究各种设计参数对 FD-SCG 滞后性能的影响，例如施加到 FD 的总夹紧力和 PT 肌腱的初始力循环载荷下的接头。在测试过程中，经测量，骨干构件（胶合梁和柱）和主要连接构件（PT 筋和 FD）始终处于弹性极限范围内。理论和实验结果都表明，在较低的初始 PT 力和夹紧力下，能量主要由 FD 耗散；相反，在高 PT 力和夹紧力下，由于试样在垂直于纹理的方向上发生轻微的局部损伤，胶合材料会消耗一些能量。此外，FD-SCG 接头可以适当设计以实现所需的刚度、负载能力、自定心能力、能量耗散能力和预期的整体系统响应。能量主要由 FD 耗散；相反，在高 PT 力和夹紧力下，由于试样在垂直于纹理的方向上发生轻微的局部损伤，胶合材料会消耗一些能量。此外，FD-SCG 接头可以适当设计以实现所需的刚度、负载能力、自定心能力、能量耗散能力和预期的整体系统响应。能量主要由 FD 耗散；相反，在高 PT 力和夹紧力下，由于试样在垂直于纹理的方向上发生轻微的局部损伤，胶合材料会消耗一些能量。此外，FD-SCG 接头可以适当设计以实现所需的刚度、负载能力、自定心能力、能量耗散能力和预期的整体系统响应。