The low‐damage self‐centering precast concrete (LDSCPC) frame connection was a kind of earthquake‐resilient joint. It was composed of precast beams and columns with embedded steel connectors, post‐tensioned tendons, and replaceable metallic yield dampers. The LDSCPC connections showed excellent self‐centering ability and low‐damage characteristics in cyclic load tests. However, the energy dissipation performance of the metallic yield damper with Z‐shaped energy dissipation strips in the test was not as good as the design expectation. Based on the finite element (FE) model validated by experiments, a series of parametric analyses were carried out to investigate the influence of various parameters on the connections' hysteretic response. The results showed that the existence of screw‐hole clearance and the lack of bolt preload made the damper cannot fully play its due performance. The damper's design parameters also had room for further optimization. Based on this, two optimization schemes of the metallic yield damper were proposed. The FE analysis results showed that the two optimization schemes significantly improved the joints' bearing capacity and energy dissipation capacity, which were the feasible and reliable upgrade schemes for LDSCPC connections.

中文翻译：

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低损伤自定心预制混凝土框架连接的设计优化，以提高耗能能力

低损伤自定心预制混凝土（LDSCPC）框架连接是一种抗震缝。它由带有嵌入式钢连接器，后张预应力筋和可更换的金属屈服阻尼器的预制梁和柱组成。LDSCPC连接在循环负载测试中表现出出色的自定心能力和低损伤特性。但是，测试中带有Z形散热片的金属屈服阻尼器的散热性能不如设计预期。在实验验证的有限元（FE）模型的基础上，进行了一系列参数分析，以研究各种参数对连接滞后响应的影响。结果表明，螺孔间隙的存在和螺栓预紧力的不足使阻尼器无法充分发挥其应有的性能。减震器的设计参数也有进一步优化的余地。在此基础上，提出了两种金属屈服阻尼器的优化方案。有限元分析结果表明，这两种优化方案显着提高了节点的承载能力和消能能力，是LDSCPC连接的可行，可靠的升级方案。