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学者姓名：卢得仁
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Abstract ：
The purpose of this study was to systematically evaluate the performance advantages of the Long Short-Term Memory (LSTM) in predicting the axial compressive capacity of short rectangular concrete-filled steel tube (RCFST) columns and to assess its effectiveness in interpreting structural mechanical responses. For the purpose of emphasizing the availability of the LSTM model, a controlled experimental design was implemented: first, the Back Propagation Neural Network (BPNN) was established as a benchmark model, and subsequently, the prediction results of both models were compared with theoretical calculations derived from existing formulas across multiple indexes. Through a quantitative analysis of experimental data from the literature, this research conducted a sensitivity analysis of key parameters in the prediction model (such as cross -sectional area of steel and yield stress of steel), comparing and evaluating the influence of each parameter on bearing capacity. The results indicate that, compared to the BPNN model, the LSTM model offers significant advantages, demonstrating higher accuracy and reduced discretization. More importantly, the weight distribution characteristics of the LSTM model align more closely with the structural mechanical mechanisms, providing a valuable reference for predicting the mechanical properties of structures.
Keyword ：
Back Propagation Neural Network Back Propagation Neural Network Long Short-Term Memory Long Short-Term Memory RCFST columns RCFST columns Sensitivity analysis Sensitivity analysis The axial compressive strength The axial compressive strength
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| GB/T 7714 | Lai, Zhichao , Zhang, Shiji , Lu, Deren et al. Evaluating neural network models for load-bearing capacity of RCFST columns [J]. | STRUCTURES , 2025 , 76 . |
| MLA | Lai, Zhichao et al. "Evaluating neural network models for load-bearing capacity of RCFST columns" . | STRUCTURES 76 (2025) . |
| APA | Lai, Zhichao , Zhang, Shiji , Lu, Deren , Zhang, Chao , Chen, Zhidong . Evaluating neural network models for load-bearing capacity of RCFST columns . | STRUCTURES , 2025 , 76 . |
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Abstract ：
This paper proposes a novel structural design for stirrups-stiffened square concrete-filled double -skin steel tubular stub columns (SCFDST) that offers high capacity and superior advantages in terms of low consumption of concrete and steel, as well as economic efficiency. The study includes an axial pressure test on two sets of 8 SCFDST columns with varying hollow ratios and stirrup ratios, with a specific focus on the influence of stirrups on mechanical properties. Experimental results demonstrate that stirrups significantly enhance the mechanical properties of SCFDST columns with large hollow ratios, including stiffness, bearing capacity, and ductility, with a more pronounced effect observed as the stirrup ratio increases. A three-dimensional solid finite element (FE) model of the SCFDST columns is developed and validated using ABAQUS software and appropriate constitutive models. Parameter analysis is then conducted based on the FE model, revealing that the stirrups not only restrain the concrete itself but also provide additional restraint by limiting the deformation of the steel tube. This improvement effect was more significant in the middle of steel tubes section. When stirrup ratio was 0.015, the steel tube had the highest constraint efficiency on the concrete. The study introduces a constraint enhancement factor to represent the enhanced restraining effect of stirrups on the steel tube, which is incorporated into a fresh equation for determining the maximum bearing capacity (Nu) of SCFDST columns. The derived formula offers clear physical meaning and high accuracy, building upon the existing formula for CFDST columns.
Keyword ：
columns columns Combined action coefficient Combined action coefficient Concrete-filled double -skin steel tubular stub Concrete-filled double -skin steel tubular stub Confinement effect Confinement effect Constraint enhancement factor Constraint enhancement factor Large hollow ratio Large hollow ratio Stirrup-stiffened Stirrup-stiffened
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| GB/T 7714 | Ding, Faxing , Lu, Deren , Lai, Zhichao et al. Study on restraint coefficient of the stirrups-stiffened square concrete filled double-skin steel tube axial compression stub columns [J]. | STRUCTURES , 2024 , 60 . |
| MLA | Ding, Faxing et al. "Study on restraint coefficient of the stirrups-stiffened square concrete filled double-skin steel tube axial compression stub columns" . | STRUCTURES 60 (2024) . |
| APA | Ding, Faxing , Lu, Deren , Lai, Zhichao , Liu, Xuemei . Study on restraint coefficient of the stirrups-stiffened square concrete filled double-skin steel tube axial compression stub columns . | STRUCTURES , 2024 , 60 . |
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