Concrete-encased concrete-filled steel tube (CECFST) columns and partially encased composite (PEC) beams are both steel-concrete composite members which have outstanding advantages and have been applicated in some engineering constructions. This paper makes an attempt to employ blind bolting technique to assemble CECFST columns to PEC beams. For the purpose of exploring the mechanical performance of this type of assembled joints, firstly, a nonlinear finite element (FE) model was established and validated, where complicated contact interaction was taken into consideration. Plenty of parametric analysis were adopted to find out the effect of ten parameters on strength and initial stiffness of the assembled joint. Numerical analysis showed that mechanic behavior is notably affected by axial load ratio, width and thickness of end-plate, bolt pretension force, bolt diameter, and steel ratio of CECFST column. Full-range analysis was then carried out to observe stress and strain developments and failure modes. Load transfer mechanism in CECFST column was also studied. Design methods to estimate the flexural capacity and initial stiffness of the connections were proposed in accordance with the component models. In comparison, it could be concluded that the calculation results fit well with the analytical results, which confirms that the design formulas could provide a favorable basis in practical design.

钢管混凝土（CECFST）柱和部分包裹组合（PEC）梁都是钢-混凝土组合构件，具有突出的优点，已在一些工程建设中得到应用。本文尝试使用盲螺栓技术将 CECFST 柱组装到 PEC 梁上。为探索此类组装接头的力学性能，首先建立并验证了非线性有限元（FE）模型，其中考虑了复杂的接触相互作用。采用大量参数分析来找出十个参数对组装接头的强度和初始刚度的影响。数值分析表明，轴向载荷比、端板宽度和厚度对力学行为的影响显着，CECFST柱的螺栓预紧力、螺栓直径和钢比。然后进行全范围分析以观察应力和应变的发展以及失效模式。还研究了 CECFST 柱中的载荷转移机制。根据组件模型提出了估计连接件的抗弯能力和初始刚度的设计方法。通过比较，可以得出计算结果与解析结果吻合良好的结论，证实了设计公式可以为实际设计提供良好的依据。根据组件模型提出了估计连接件的抗弯能力和初始刚度的设计方法。通过比较，可以得出计算结果与解析结果吻合良好的结论，证实了设计公式可以为实际设计提供良好的依据。根据组件模型提出了估计连接件的抗弯能力和初始刚度的设计方法。通过比较，可以得出计算结果与解析结果吻合良好的结论，证实了设计公式可以为实际设计提供良好的依据。