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<p>Modular steel structures have emerged as a key focus in prefabricated construction, where the performance of inter-module connections plays a critical role in ensuring overall structural integrity. This study proposes a novel Mortise-Tenon Connection (MTC) system for modular steel frames and investigates its static behavior. The MTC offers several advantages, including enhanced structural reliability, rapid on-site assembly, broad applicability, and reusability. Two sets of full-scale monotonic loading tests were conducted on corner columns to analyze the effect of stiffeners on the static performance of the joints. A validated finite element model was then developed to carry out a parametric study, considering six key factors: stiffener configuration, joint region height, connecting plate thickness, bolt specifications, bolt preload, and axial compression ratio. The results indicate that the MTC exhibits semi-rigid behavior under monotonic loading. Stiffeners were found to increase load-bearing capacity and shift the plastic hinge away from the beam end, improving ductility. Increasing the joint region height from 120&#xa0;mm to 150&#xa0;mm and 180&#xa0;mm resulted in a 7% and 29.9% reduction, respectively, in ultimate load capacity. The thickness of the connecting plate and the axial compression ratio were also found to influence performance, while bolt specifications and preload had minimal effect on the joint’s flexural capacity. These findings highlight the potential of the proposed MTC system for improving structural performance and construction efficiency in modular steel buildings.</p>

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Research on Static Performance of Mortise-Tenon Connection for Modular Steel Construction

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Yun Xu,
  • Mingliang Zhu,
  • Shichang Zhang

摘要

Modular steel structures have emerged as a key focus in prefabricated construction, where the performance of inter-module connections plays a critical role in ensuring overall structural integrity. This study proposes a novel Mortise-Tenon Connection (MTC) system for modular steel frames and investigates its static behavior. The MTC offers several advantages, including enhanced structural reliability, rapid on-site assembly, broad applicability, and reusability. Two sets of full-scale monotonic loading tests were conducted on corner columns to analyze the effect of stiffeners on the static performance of the joints. A validated finite element model was then developed to carry out a parametric study, considering six key factors: stiffener configuration, joint region height, connecting plate thickness, bolt specifications, bolt preload, and axial compression ratio. The results indicate that the MTC exhibits semi-rigid behavior under monotonic loading. Stiffeners were found to increase load-bearing capacity and shift the plastic hinge away from the beam end, improving ductility. Increasing the joint region height from 120 mm to 150 mm and 180 mm resulted in a 7% and 29.9% reduction, respectively, in ultimate load capacity. The thickness of the connecting plate and the axial compression ratio were also found to influence performance, while bolt specifications and preload had minimal effect on the joint’s flexural capacity. These findings highlight the potential of the proposed MTC system for improving structural performance and construction efficiency in modular steel buildings.