Abstract In this study, curved haunched connections were developed for modularized prefabricated steel structures, where prefabricated steel pipe columns with curved haunches and H-beams are assembled on-site with connectors and bolts. The seismic performance of the developed connections was investigated, based on a cyclic testing and finite element analysis of two full-scale specimens. Critical seismic performance measures associated with the joints, such as the failure pattern, hysteresis property, stiffness degradation, ductility, and initial rotational stiffness, were analyzed; furthermore, the effectiveness of the different curved haunches in enhancing the seismic performance of the joints was discussed. A comparative analysis based on experimental and numerical tests revealed that the curved haunches could increase the flexural resistance of the steel pipe columns, change the internal stress distribution of the steel H-beams, and enhance the rotational stiffness of the joint. Owing to the existence of the curved haunches, the beam flanges around the haunch ends fail prior to the damage of the H-beam ends. Connections with shorter haunches are more prone to yielding, owing to the shorter legs of the haunches causing greater stress concentrations in the beam flanges around the haunch ends. In addition, the ductility of the connections crucially hinges on the beam flanges around the haunch ends, where proper strengthening is required to diminish the stress concentrations and section weakening caused by the bolt holes. Both connections can be classified as rigid, and the initial rotational stiffness is related to the length of the curved haunch. This study also presents a theoretical calculation method for the elastic panel zone rotational stiffness.

中文翻译：

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模块化预制钢结构弯拱连接的抗震性能

摘要 在这项研究中，为模块化预制钢结构开发了弯曲的拱形连接，其中带有弯曲拱形和 H 型梁的预制钢管柱通过连接件和螺栓在现场组装。基于对两个全尺寸试样的循环测试和有限元分析，研究了开发连接的抗震性能。分析了与接头相关的关键抗震性能指标，例如失效模式、滞后特性、刚度退化、延展性和初始旋转刚度；此外，还讨论了不同弯曲臀部在提高节点抗震性能方面的有效性。基于试验和数值试验的对比分析表明，弯曲的臀部可以增加钢管柱的抗弯能力，改变钢H型梁的内应力分布，提高节点的旋转刚度。由于弯曲腰部的存在，腰部周围的梁翼缘在 H 型梁端部损坏之前失效。具有较短腰部的连接更容易屈服，因为腰部较短的腿会在腰部端部周围的梁法兰中引起更大的应力集中。此外，连接的延展性关键取决于腰部端部周围的梁法兰，需要适当加强以减少由螺栓孔引起的应力集中和截面弱化。两种连接都可以归类为刚性连接，初始旋转刚度与弯曲臀部的长度有关。本研究还提出了弹性板区旋转刚度的理论计算方法。