Abstract A kind of low-damage self-centering precast concrete (LDSCPC) frame connection with replaceable dampers was proposed. Precast components with embedded steel connectors were assembled by unbonded post-tensioned (PT) tendons, and the modular energy dissipation devices made them have great upgrading and expanding capacity. Based on the cyclic load tests of three specimens of LDSCPC frame joint and one specimen of RC frame joint, the influence of initial PT force, location of PT tendons and contribution of dampers on the mechanical performance of LDSCPC joint and the significant difference with RC joint were studied. The test results showed that the load-displacement behavior of the LDSCPC joint presented two-stage characteristics, with the excellent self-centering ability and stable mechanical properties. The stress level of the precast beam of the LDSCPC joint at 3% chord rotation could reach the stress level that of the RC joint at 0.25% chord rotation, and only a few 0.08 mm wide cracks appeared on the concrete surface. The precast components were at lower stress levels and had excellent low damage characteristics. The elaborate solid-element FE model was established, and the results of numerical simulation proved the behavior and characteristics of the LDSCPC joint in the experiment. The parametric study related to the damper was carried out, and some design comments and suggestions were also made.

中文翻译：

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带可更换阻尼器的低损伤自定心预制混凝土框架连接的试验和数值研究

摘要 提出了一种具有可更换阻尼器的低损伤自定心预制混凝土(LDSCPC)框架连接。预制构件内嵌钢连接件由无粘结后张（PT）筋组装而成，模块化的耗能装置使其具有很大的升级和扩展能力。基于3个LDSCPC框架接头试件和1个RC框架接头试件的循环载荷试验，初步PT力、PT筋位置和阻尼器对LDSCPC接头力学性能的影响以及与RC接头的显着差异被研究。试验结果表明，LDSCPC接头的载荷-位移行为呈现两阶段特性，具有优良的自定心能力和稳定的力学性能。LDSCPC节点预制梁在3%弦杆旋转时的应力水平可达到RC节点在0.25%弦杆旋转时的应力水平，混凝土表面仅出现少量0.08 mm宽的裂缝。预制构件的应力水平较低，并且具有出色的低损伤特性。建立了精细的实体单元有限元模型，数值模拟结果证明了LDSCPC接头在实验中的行为和特性。对阻尼器的相关参数进行了研究，并提出了一些设计意见和建议。预制构件的应力水平较低，并且具有出色的低损伤特性。建立了精细的实体单元有限元模型，数值模拟结果证明了LDSCPC接头在实验中的行为和特性。对阻尼器的相关参数进行了研究，并提出了一些设计意见和建议。预制构件的应力水平较低，并且具有出色的低损伤特性。建立了精细的实体单元有限元模型，数值模拟结果证明了LDSCPC接头在实验中的行为和特性。对阻尼器的相关参数进行了研究，并提出了一些设计意见和建议。