Research on the Lateral Resistance of Modular Steel Sub-Frames with Composite Double Beams

XU Bo; SONG Jiwei; XIA Junwu; CHANG Hongfei

doi:10.3724/j.gyjzG22122806

Volume 55 Issue 9

Sep. 2025

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XU Bo, SONG Jiwei, XIA Junwu, CHANG Hongfei. Research on the Lateral Resistance of Modular Steel Sub-Frames with Composite Double Beams[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(9): 168-175. doi: 10.3724/j.gyjzG22122806

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XU Bo, SONG Jiwei, XIA Junwu, CHANG Hongfei. Research on the Lateral Resistance of Modular Steel Sub-Frames with Composite Double Beams[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(9): 168-175. doi: 10.3724/j.gyjzG22122806

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Research on the Lateral Resistance of Modular Steel Sub-Frames with Composite Double Beams

doi: 10.3724/j.gyjzG22122806

1. School of Urban Construction, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory Environment Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, China;
3. Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, Xuzhou 221116, China

Received Date: 2022-12-28
Available Online: 2025-11-05

Abstract

Abstract

To evaluate the influence of double-beam composite action on the lateral resistance of modular steel buildings， full-scale tests， numerical simulations， and theoretical analyses were conducted on four modular steel sub-frame specimens with composite double beams. The lateral resistance was analyzed， the load transfer mechanism was verified， and finally the lateral force-resisting mechanism was revealed with the development of an initial lateral stiffness model. The results showed that after the installation of high-strength bolts，the lateral bearing capacity and initial lateral stiffness increased by approximately 15% and 19%， respectively. The mechanistic analysis indicated that the composite bolted double-beam system optimized the lateral load transfer path in modular buildings， enhancing the mechanical coupling between upper and lower modules. Additionally， the composite bending action of the double beams improved the equivalent stiffness of double-beam structures， thereby effectively enhancing the overall lateral resistance. Based on the theoretical formula for equivalent bending stiffness of double-beam structures， a mechanical model for the initial lateral stiffness of modular steel sub-frames was proposed. The calculated results from the model agreed well with both experimental and numerical results.
- modular steel building,
- double-beam structure,
- preload plug-in joint,
- lateral resistance,
- composite bending action

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References(25)

References

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