Volume 40 Issue 5
Oct.  2026
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2026  >  40(5): 682-692
HU Jisong, ZHOU Shudong. In-plane stability analysis of frame-type concrete strut for foundation pit engineering[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 682-692. doi: 10.20265/j.cnki.issn.1007-2993.2025-0198
Citation: HU Jisong, ZHOU Shudong. In-plane stability analysis of frame-type concrete strut for foundation pit engineering[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 682-692. doi: 10.20265/j.cnki.issn.1007-2993.2025-0198
shu

In-plane stability analysis of frame-type concrete strut for foundation pit engineering

doi: 10.20265/j.cnki.issn.1007-2993.2025-0198
  • 1.

    Guangdong Guanji Geotechnical Engineering Co., Ltd., Guangzhou 510640, Guangdong, China

  • 2.

    Dongguan Academy of Building Sciences Co., Ltd., Dongguan 523000, Guangdong, China

  • Received Date: 2025-04-30
  • Accepted Date: 2026-02-10
  • Rev Recd Date: 2025-12-24
    • Available Online: 2026-10-08
  • Publish Date: 2026-10-08
    Abstract
  • The excavation specifications do not specify the calculation length value for the stability of the concrete frame support plane. Currently, the calculation length coefficient formula for frame columns in steel structures, concrete specifications, and related research does not consider the influence of support length and fixed boundary conditions at both ends. Based on the load-bearing model, a systematic in-plane stability analysis of the frame bracing system is conducted by treating the bracing members as mega-lattice columns. Utilizing the exact theoretical solution for the stability buckling of battened lattice columns, and accounting for the individual member action, the effective length of the bracing, and the fixed-end boundary conditions, a formula for the effective length factor of the bracing is derived. Furthermore, the energy method is employed to deduce the in-plane effective length factor formula for bracing members with fixed-end boundary conditions, incorporating the lateral stiffness of the steel columns. The calculated results demonstrate a high degree of agreement with those obtained from finite element eigenvalue buckling analysis, confirming that the proposed formulas achieve sufficient accuracy for practical engineering design applications.

     

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