Research on the Tensile Performance of Novel Fully-Bolted Prefabricated Splicing Joints Between Modules

To achieve efficient connections between modules of modular steel frames，a novel inner sleeve connection joint facilitating onsite fully-bolted assembly is proposed. To investigate the mechanical properties，failure mechanism，and influencing parameters of this novel joint under tensile loading，monotonic tensile tests and finite element analyses were conducted by focusing on its local connection details. Four sets of scaled models were designed for a comparative study on the mechanical peroperty indicators（e. g. ，deformation characteristics，failure modes，and bearing capacity）and the evolution mechanisms of the novel connection structure under tensile conditions. Based on the test data，an ABAQUS finite element model was established to perform parametric analysis on the key parameters of the joint. The research results indicated that the thickness and length of the inner sleeve component had a negligible effect on the tensile performance of the novel joint；variations in the thickness of the angle steel component significantly influenced the yield load and peak load of the novel joint under monotonic tension；the thickness of the connecting plate had a certain impact on the tensile capacity of the novel joint，but the coordinated force and deformation between the connecting plate and the angle steel through high-strength bolts should be taken into account for rational design. Based on the analysis results，practical design suggestions and further optimization directions for this novel fully-bolted connection structure between modules were proposed，providing a theoretical and technical basis for advancing the industrialization of modular steel frame structures and realizing efficient connections between modules.