This paper aims to evaluate the seismic performance of concrete filled double-skin steel tubular (CFDST) frame structures. An experimental investigation on internal joints to CFDST columns was conducted to assess their seismic behavior, in which non-welding connection method was employed to avoid possible premature welding fracture. Experimental results declared that this type of joint behaved in a semi-rigid manner. Numerical models were then established to simulate the seismic performance of the joints. The moment–rotation relationship and shear behavior of panel zone were both accounted according to the component method and strut model, respectively. Subsequently, a CFDST moment resisting frame with non-welding connections (NWF) was numerically analyzed to detect its seismic response under design-based and maximum considered earthquakes. The numerical results confirmed that the NWF could lower the seismic response in terms of base shear force and joint moment compared with namely rigid frame (NRF). It also verified that the maximum story drift ratios of the NWF were higher than those of the NWF. Increment dynamic analyses (IDA) were also performed to evaluate the collapse behavior. Furthermore, a detailed discussion was conducted to analyze the influence of joint stiffness on global behavior of the NWF. The analytical results verified that this type of NWF had satisfied seismic behavior and excellent anti-collapse performance. More importantly, the NWF could conveniently adjust the stiffness of each story by varying the stiffness of the non-welding connection to decrease the story drift and to achieve a uniform story drift distribution.

本文旨在评估混凝土填充的双层钢管（CFDST）框架结构的抗震性能。对CFDST柱的内部接头进行了实验研究，以评估其抗震性能，其中采用非焊接连接方法以避免可能的焊接过早断裂。实验结果表明，这种类型的接头表现为半刚性。然后建立数值模型来模拟接头的抗震性能。面板区域的弯矩-旋转关系和剪切行为都分别根据构件法和支杆模型进行了计算。随后，对具有非焊接连接（NWF）的CFDST抗弯框架进行了数值分析，以检测其在基于设计和最大考虑地震的情况下的地震响应。数值结果证实，与刚性框架（NRF）相比，NWF可以在基础剪力和节点弯矩方面降低地震响应。它还证实了NWF的最大故事漂移率高于NWF。还进行了增量动态分析（IDA）来评估倒塌行为。此外，进行了详细的讨论以分析关节刚度对NWF整体行为的影响。分析结果证明，这种类型的NWF具有令人满意的抗震性能和出色的抗塌陷性能。更重要的是，NWF可以通过改变非焊接连接的刚度来方便地调整每个故事的刚度，以减少故事的漂移并实现均匀的故事漂移分布。