In this study, seven emulative precast concrete (PC) beam-column subassemblies with or without connecting bars and one concrete (RC) were fabricated and tested to investigate the effect of various types of anchorage detailing for reinforcing and connecting bars on the progressive collapse resistances. Two anchorage detailing formats for steel bars with bending and straight ends were used in the PC specimens for both the reinforcing and connecting bars. Test results show that, as found in the RC specimen, resisting mechanisms including pure flexure, compressive arch action (CAA) and tensile catenary action (TCA) were sequentially activated in all PC specimens. It is demonstrated that the connecting bars improved the progressive collapse resistance in both the CAA and TCA stages. The effect of the anchorage detailing was found to be negligible in CAA stage. However, in the TCA stage, the proper usage of the straight end for steel bars was helpful to improve the deformation capacity and thereafter enhanced the progressive collapse resistance. When the loading resistance, the deformation capacity as well as the construction flexibility are taken into account, the configuration consisting of both reinforcing and connecting bars with straight end as anchorage detailing is recommended for the design of precast beam-column connections in case a central column removal scenario is assumed.

中文翻译：

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不同锚固细节的仿真预制混凝土梁柱组件抗连续倒塌试验研究

在本研究中，制作并测试了七个带或不带连接杆的模拟预制混凝土 (PC) 梁柱组件和一个混凝土 (RC)，以研究各种类型的钢筋和连接杆锚固细节对渐进式倒塌阻力的影响。钢筋和连接钢筋的 PC 样本中使用了两种带有弯曲端和直端的钢筋锚固详图格式。测试结果表明，正如在 RC 试件中发现的那样，所有 PC 试件中的抵抗机制包括纯弯曲、压缩拱形作用 (CAA) 和拉伸悬链线作用 (TCA)。结果表明，连接杆提高了 CAA 和 TCA 阶段的抗连续倒塌能力。发现锚固细节的影响在 CAA 阶段可以忽略不计。但在TCA阶段，正确使用钢筋直端有助于提高变形能力，进而增强抗连续倒塌能力。当考虑荷载、变形能力和施工灵活性时，对于中心柱的预制梁柱连接设计，建议采用直端钢筋和连杆作为锚固结构的配置假设移除场景。