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Experimental study on seismic performance of a new transfer joint in the steel-concrete vertical hybrid structure
Journal of Constructional Steel Research ( IF 4.1 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jcsr.2020.106259
Jin-Yang Gao , Xin Nie , Ran Ding , Jian-Sheng Fan

Abstract Steel-concrete vertical hybrid structure (S-RC structure) is usually composed of upper steel and lower reinforced concrete (RC) structures. The transfer joint between them is the key part to ensure the vertical structural internal force transferring. This study proposed a new kind of joint by inserting the upper steel column into the lower RC column. To study the seismic performance of this joint, four specimens are tested under cyclic loading. The effects of axial force ratio, steel column size, and embedded depth ratio are investigated and discussed. Test results show that the failure patterns are typical beam flexural failure with plastic hinges formed at the beam ends adjacent to the corbel. All the specimens exhibited satisfied seismic performance with stable load-displacement response, excellent energy dissipation capacity and ductility. Furthermore, the increase of steel column size shows positive influence on the joint strength and stiffness, and larger axial force ratio can greatly improve the energy dissipation capacity, while increasing the embedded depth ratio only improves the strength by less than 10%. Finally, calculation methods for the bearing capacity and design suggestions on the embedded depth ratio of the steel column are both proposed for the new joint, which provide useful guidance on the design of the transfer joint in S-RC structures.

中文翻译:

钢-混凝土竖向混合结构新型转换接头抗震性能试验研究

摘要 钢-混凝土垂直混合结构(S-RC结构)通常由上部钢结构和下部钢筋混凝土(RC)结构组成。它们之间的传递接头是保证竖向结构内力传递的关键部分。本研究提出了一种将上钢柱插入下钢筋混凝土柱的新型接头。为了研究该接头的抗震性能,在循环载荷下测试了四个试样。研究和讨论了轴力比、钢柱尺寸和嵌入深度比的影响。测试结果表明,破坏模式是典型的梁弯曲破坏,在与牛腿相邻的梁端形成塑性铰。所有试件均表现出满意的抗震性能,荷载位移响应稳定,优异的能量耗散能力和延展性。此外,钢柱尺寸的增加对节点强度和刚度有积极影响,较大的轴力比可以大大提高能量耗散能力,而增加埋深比仅使强度提高不到10%。最后,提出了新节点的承载力计算方法和钢柱预埋深度比的设计建议,为S-RC结构传递节点的设计提供了有益的指导。而增加嵌入深度比只能提高不到10%的强度。最后,提出了新节点的承载力计算方法和钢柱预埋深度比的设计建议,为S-RC结构传递节点的设计提供了有益的指导。而增加嵌入深度比只能提高不到10%的强度。最后,提出了新节点的承载力计算方法和钢柱预埋深度比的设计建议,为S-RC结构传递节点的设计提供了有益的指导。
更新日期:2020-11-01
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