A new unbonded post‐tensioned precast concrete (PTPC) frame with controllable post‐decompression stiffness (CPDS), achieved by employing novel variable friction energy dissipaters (VFEDs), is proposed in this paper. A steel corbel (SC) is used in the CPDS‐PTPC connection to enhance the shear capacity. The VFED incorporates grooved steel plates and a combination of Bellville washers to provide variable energy dissipation and load‐resisting capacity to achieve target structural performance at different seismic intensity levels. A series of cyclic tests of a full‐scale beam‐to‐column specimen were carried out with different design parameters to investigate the hysteretic behavior of the proposed CPDS‐PTPC connection. The specimen was subjected to cyclic loading up to 9.0% drift to observe different levels of structural damage. Finally, a numerical model is proposed and validated with experimental data, and parametric analyses were performed by varying geometric properties of the VFEDs in the model. Both experimental and numerical analyses confirm the unique capabilities of the proposed CPDS‐PTPC connections to achieve tunable seismic behavior, especially in controlling post‐decompression stiffness while also providing desirable ductile damage at very large seismic demands. The post‐decompression stiffness and load‐carrying capacity are mainly controlled by the stiffness of post‐tensioned (PT) elements and configuration of VFEDs.

中文翻译：

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可控的后减压刚度无粘结后张法预制混凝土连接的试验和数值研究

提出了一种新型的无粘结后张预应力混凝土框架（PTPC），该框架通过采用新型可变摩擦耗能器（VFED）实现了可控的后压缩刚度（CPDS）。CPDS-PTPC连接中使用钢牛腿（SC）来增强剪切能力。VFED结合了带槽钢板和Bellville垫圈的组合，以提供可变的能量耗散和抗负载能力，从而在不同的地震烈度水平下实现目标结构性能。用不同的设计参数对一个完整的梁到柱标本进行了一系列的循环测试，以研究所提议的CPDS-PTPC连接的滞后行为。样品承受高达9.0％的漂移的周期性载荷，以观察不同程度的结构损伤。最后，提出了数值模型并通过实验数据进行了验证，并通过改变模型中VFED的几何特性进行了参数分析。实验和数值分析都证实了建议的CPDS-PTPC连接具有独特的功能，可实现可调节的地震行为，尤其是在控制减压后的刚度的同时，还可以在非常大的地震需求下提供理想的延性破坏。减压后的刚度和承载能力主要受后张式（PT）单元的刚度和VFED的配置控制。实验和数值分析都证实了建议的CPDS-PTPC连接具有独特的功能，可实现可调节的地震行为，尤其是在控制减压后的刚度的同时，还可以在非常大的地震需求下提供理想的延性破坏。减压后的刚度和承载能力主要受后张式（PT）单元的刚度和VFED的配置控制。实验和数值分析都证实了建议的CPDS-PTPC连接具有独特的功能，可实现可调节的地震行为，尤其是在控制减压后的刚度的同时，还可以在非常大的地震需求下提供理想的延性破坏。减压后的刚度和承载能力主要受后张式（PT）单元的刚度和VFED的配置控制。