A novel steel-encased beam-end connection (SEBC) between concrete-filled steel tubular (CFST) column and precast reinforced concrete (PRC) beam is proposed, to achieve the simple on-site assembly of prefabricated CFST bridge piers. Quasi-static tests were carried out to evaluate the seismic behavior of nine SEBC specimens and the key parameters are the encasement length of U-shaped steel jacket and the shear connectors at the jacket's bottom flange. The test results indicate that the proposed beam-end connection with rational encasement length and sufficient shear connectors can effectively transfer the bending moment from the beam to the column. In this case, specimens occurred ideal flexural failure at the beam-end, and the plastic hinge was concentrated at the transition zone between the steel jacket and RC beam, exhibiting excellent energy dissipation capacity and good ductility, which is close to that of a fixed-end RC beam. Besides, the force transfer mechanism of this joint was explained through preliminary theoretical analysis, and the test results were compared with the theoretical results obtained from the classical RC beam bending capacity formula, verifying the reliability of this connection.

中文翻译：

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预制 RC 梁-钢管混凝土柱之间新型钢套梁端连接 (SEBC) 的抗震性能，可实现简单的现场组装

提出了一种新型钢管混凝土（CFST）柱与预制钢筋混凝土（PRC）梁之间的钢套梁端连接（SEBC），以实现预制钢管混凝土桥墩的简单现场组装。通过准静态试验评估了9个SEBC试件的抗震性能，关键参数是U型钢导管套的围护长度和导管架底部翼缘处的剪力连接件。试验结果表明，所提出的梁端连接具有合理的围护长度和足够的剪力连接件，可以有效地将弯矩从梁传递到柱上。本例试件在梁端发生了理想的弯曲破坏，塑性铰集中在钢护套与钢筋混凝土梁的过渡区，表现出优异的耗能能力和良好的延性，接近固定结构。末端 RC 梁。此外，通过初步的理论分析解释了该接头的力传递机理，并将试验结果与经典RC梁抗弯能力公式得到的理论结果进行了比较，验证了该接头的可靠性。