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学者姓名：廖飞宇
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Abstract ：
This study investigates the cyclic performance of circular concrete-filled thin-walled steel tubular (CFST) composite joints having circumferential gaps, focusing on the reduction of steel tube thickness and novel reinforcement strategies using a CFRP-annular stiffener system. Experimental tests and finite element analysis (FEA) were conducted on four large-scale specimens to evaluate hysteretic behavior, energy dissipation, failure patterns, and interfacial interactions. Results revealed that reducing steel tube wall thickness decreased ultimate strength by 20-25%. The hybrid CFRP-annular stiffener system effectively mitigated these deficiencies, enhancing yield load capacity by 50% and cumulative energy dissipation by around 40% compared to unreinforced joints. This system redistributed stress concentrations, suppressed shear deformation, delayed buckling, and shifted failure locations from catastrophic joint-core shear failure to ductile beam flange/web fractures. Parametric FEA confirmed the system's robustness under combined adverse conditions, restoring 80% of lost load capacity relative to thicker-tube benchmarks. A predictive model quantified reinforcement efficacy, showing dependence on CFRP layers and stiffener thickness rather than steel strength. The study bridges experimental and numerical insights, proposing practical retrofitting guidelines for defective CFST structures in seismic regions.
Keyword ：
Annular stiffeners Annular stiffeners CFRP wraps CFRP wraps CFST composite joints CFST composite joints Circumferential gaps Circumferential gaps Cyclic loading Cyclic loading
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| GB/T 7714 | Lai, Dade , Cui, Yucheng , Liao, Feiyu et al. Cyclic performance of novel strengthened CFST composite joints with circumferential gaps [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2026 , 236 . |
| MLA | Lai, Dade et al. "Cyclic performance of novel strengthened CFST composite joints with circumferential gaps" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 236 (2026) . |
| APA | Lai, Dade , Cui, Yucheng , Liao, Feiyu , Lu, Feng . Cyclic performance of novel strengthened CFST composite joints with circumferential gaps . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2026 , 236 . |
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This study presents an experimental and numerical investigation of the hysteretic behavior of concrete filled thinwalled steel tubular K-joints with spherical-cap gaps. Twelve concrete-filled steel tubular (CFST) bottom chordsteel tubular web K-joint specimens were tested under cyclic loading applied to the thin-walled CFST chord. The influence of spherical-cap gap ratios, web-to-chord diameter ratios, and chord diameter-to-thickness ratios on the failure modes, overall structural behavior, load-carrying capacity, stiffness, and ductility was examined. Numerical analyses were conducted to validate the experimental results and perform parametric studies to further investigate the impact of gap ratios, geometry, and material properties on the structural behavior. Additionally, an in-depth analysis of the stress distribution between the web and CFST chord at the K-joint was performed to reveal the influence of spherical-cap gap on the load transfer mechanism. Existing design formulae were calibrated using proposed strength reduction factors to calculate the load-carrying capacity of these K-joints based on different failure modes. The results demonstrate that the presence of spherical-cap gaps can have a detrimental effect on the overall structural integrity. The findings of this study provide valuable insights for the design and safety assessment of thin-walled CFST K-joint connections in buildings and bridges.
Keyword ：
Concrete-filled tubular chord Concrete-filled tubular chord Finite element analysis Finite element analysis Hysteretic behavior Hysteretic behavior Spherical-cap gap Spherical-cap gap Steel tubular web-chord K -joint Steel tubular web-chord K -joint
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| GB/T 7714 | Yang, Yuxing , Liao, Feiyu , Ren, Yu et al. Hysteretic behavior of concrete filled thin-walled steel tubular K-joints with spherical-cap gap at chord [J]. | THIN-WALLED STRUCTURES , 2025 , 213 . |
| MLA | Yang, Yuxing et al. "Hysteretic behavior of concrete filled thin-walled steel tubular K-joints with spherical-cap gap at chord" . | THIN-WALLED STRUCTURES 213 (2025) . |
| APA | Yang, Yuxing , Liao, Feiyu , Ren, Yu , Zhou, Jian , Wang, Ying . Hysteretic behavior of concrete filled thin-walled steel tubular K-joints with spherical-cap gap at chord . | THIN-WALLED STRUCTURES , 2025 , 213 . |
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本发明公开了一种基于计算机视觉的土木工程结构动态位移测量方法，首先进行相机标定，然后基于无迹卡尔曼结合时空上下文和改进光流算法的特征融合方法，时空上下文算法注重图像强度与其局部上下文间的相关性计算，用于计算结构的整像素位移；还兼顾了光流算法的亚像素级测量；再通过无迹卡尔曼滤波结合两者进行位移计算，并将计算的协方差用于下一帧的预测，提高了位移预测的准确性和稳定性。本方法能够实现在照明变化下对低纹理表面的精确位移测量，具有更高的鲁棒性。
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| GB/T 7714 | 骆勇鹏 , 陈思昊 , 廖飞宇 . 一种基于计算机视觉的土木工程结构动态位移测量方法 : CN202311387503.4[P]. | 2023-10-24 . |
| MLA | 骆勇鹏 et al. "一种基于计算机视觉的土木工程结构动态位移测量方法" : CN202311387503.4. | 2023-10-24 . |
| APA | 骆勇鹏 , 陈思昊 , 廖飞宇 . 一种基于计算机视觉的土木工程结构动态位移测量方法 : CN202311387503.4. | 2023-10-24 . |
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本实用新型公开了一种榫卯式钢管混凝土叠合柱段装配连接节点，在现场施工时，榫头段与榫槽段已经预先浇注完成，完全避免施工现场所需要进行的焊接工作，解决现场浇筑混凝土或灌浆材料等湿作业所带来的污染，在施工现场仅需进行简单吊装拼装即可，具有施工便捷、施工效率高、不必等待混凝土硬化等优点。节点包括榫头段以及榫槽段，榫头段包括上柱段钢端板、内钢侧板以及上柱段钢榫头，装配连接节点具有可靠有效的传力机制；通过上述构造，可保证钢管混凝土叠合柱段间的装配连接节点区的剪力和轴力可以完全传递，并使节点具有足够的轴向和侧向刚度。
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| GB/T 7714 | 廖飞宇 , 陈奕鹏 , 陈宇峰 . 一种榫卯式钢管混凝土叠合柱段装配连接节点 : CN202421537103.7[P]. | 2024-07-01 . |
| MLA | 廖飞宇 et al. "一种榫卯式钢管混凝土叠合柱段装配连接节点" : CN202421537103.7. | 2024-07-01 . |
| APA | 廖飞宇 , 陈奕鹏 , 陈宇峰 . 一种榫卯式钢管混凝土叠合柱段装配连接节点 : CN202421537103.7. | 2024-07-01 . |
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本实用新型公开了一种装配式蝴蝶形多腔钢管混凝土叠合结构，包括：蝴蝶形多腔钢管混凝土和外围钢筋混凝土，所述外围钢筋混凝土包覆于蝴蝶形多腔钢管混凝土的外围。本实用新型内置蝴蝶形多腔钢管混凝土的叠合结构，能满足机场、体育场、高铁站等大型公共建筑中树状结构的节点连接需求，而且具有刚度更大、可在截面尺寸固定的情况下对核心混凝土约束更好、装配化便捷施工等优点。
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| GB/T 7714 | 廖飞宇 , 凃丰钦 , 陈宇峰 . 一种装配式蝴蝶形多腔钢管混凝土叠合结构 : CN202421535120.7[P]. | 2024-07-01 . |
| MLA | 廖飞宇 et al. "一种装配式蝴蝶形多腔钢管混凝土叠合结构" : CN202421535120.7. | 2024-07-01 . |
| APA | 廖飞宇 , 凃丰钦 , 陈宇峰 . 一种装配式蝴蝶形多腔钢管混凝土叠合结构 : CN202421535120.7. | 2024-07-01 . |
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本实用新型公开了建筑材料小构件霍普金森压杆系统三点弯曲试验装置，本方案巧妙性通过三点弯曲夹头来进行托持试样，以及利用夹头的一对压头与试样接触配合，再通过霍普金森压杆系统的入射杆施加作用力，使得试样在试验时，其被约束在霍普金森压杆系统的入射杆和与透射杆连接的三点弯曲夹头之间，本方案还巧妙性通过将一对所述压头设置成可拆卸调整间距的结构形式，使得本方案装置可以通过调整一对所述压头的间距来调整对时间的加载间距，其不仅结构简单，且实施可靠、应用灵活，可以应用在建筑材料小构件的动载试验中。
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| GB/T 7714 | 陈宇峰 , 邱豪 , 廖飞宇 et al. 建筑材料小构件霍普金森压杆系统三点弯曲试验装置 : CN202421545213.8[P]. | 2024-07-02 . |
| MLA | 陈宇峰 et al. "建筑材料小构件霍普金森压杆系统三点弯曲试验装置" : CN202421545213.8. | 2024-07-02 . |
| APA | 陈宇峰 , 邱豪 , 廖飞宇 , 谢超杰 , 黄建明 , 李毅鑫 et al. 建筑材料小构件霍普金森压杆系统三点弯曲试验装置 : CN202421545213.8. | 2024-07-02 . |
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This study investigates the behavior of ultra-high-performance concrete (UHPC) encased concrete filled steel tubular (CFST) stub columns under eccentric compression. Nine specimens were tested to evaluate the influence of load eccentricity, reinforcement ratio, and slenderness ratio on the failure mode, axial load-axial displacement curve, load bearing capacity, second-order effect, and ductility of the members. A finite element model was developed and validated against the experimental results. The model was used to analyze the load distribution, stress development, and contact stress between different components of the members. Parametric studies were conducted to clarify the influence of steel fiber content, compressive strength of core concrete, slenderness ratio, steel yield strength, and eccentricity on the behavior of the members. The accuracy of existing code provisions for calculating the load bearing capacity of UHPC encased CFST stub columns under eccentric loading was evaluated. The findings of this study provide valuable insights for the design and application of UHPC encased CFST stub columns in practical engineering projects.
Keyword ：
CFST stub CFST stub Contact stress Contact stress Eccentricity Eccentricity Finite element analysis Finite element analysis UHPC encased UHPC encased
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| GB/T 7714 | Yang, Yuxing , Liao, Feiyu , Ye, Hongming et al. Compressive behavior of ultra-high-performance concrete (UHPC) encased concrete-filled steel tubular (CFST) stub columns under eccentric loading [J]. | STRUCTURES , 2025 , 78 . |
| MLA | Yang, Yuxing et al. "Compressive behavior of ultra-high-performance concrete (UHPC) encased concrete-filled steel tubular (CFST) stub columns under eccentric loading" . | STRUCTURES 78 (2025) . |
| APA | Yang, Yuxing , Liao, Feiyu , Ye, Hongming , Wang, Ying , Ren, Yu , Chen, Yufeng et al. Compressive behavior of ultra-high-performance concrete (UHPC) encased concrete-filled steel tubular (CFST) stub columns under eccentric loading . | STRUCTURES , 2025 , 78 . |
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为探究新型减缩剂(U-SRA)对超高性能混凝土(UHPC)自收缩的影响，研究了不同掺量U-SRA对水泥孔隙溶液表面张力、UHPC自收缩和抗压强度、抗折强度的影响。结果表明：U-SRA可显著降低孔隙溶液表面张力，当掺量为2%时，达到临界掺量，此时孔隙溶液的表面张力为31 mN/m;随着U-SRA的掺入，UHPC的自收缩显著减低，相比基准组，掺2%U-SRA的7 d自收缩最高可降低45.57%;U-SRA对UHPC力学性能提高显著，掺2%U-SRA的UHPC相较基准组28 d抗压强度和抗折强度可分别提高8.20%和4.21%。本研究可为相关工程应用提供参考。
Keyword ：
减缩剂 减缩剂 力学性能 力学性能 收缩率 收缩率 自收缩 自收缩 超高性能混凝土 超高性能混凝土
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| GB/T 7714 | 廖飞宇 , 孙政和 , 张思雅 et al. 新型减缩剂对UHPC自收缩性能试验研究 [J]. | 福建建设科技 , 2025 , 3 (01) : 60-62 . |
| MLA | 廖飞宇 et al. "新型减缩剂对UHPC自收缩性能试验研究" . | 福建建设科技 3 . 01 (2025) : 60-62 . |
| APA | 廖飞宇 , 孙政和 , 张思雅 , 赖光洪 , 陈宇峰 , 丘华生 . 新型减缩剂对UHPC自收缩性能试验研究 . | 福建建设科技 , 2025 , 3 (01) , 60-62 . |
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Concrete-filled steel tube (CFST) columns are widely utilized in modern structural systems due to their excellent load-bearing capacity, ductility, and energy dissipation characteristics. However, accurately predicting their failure modes under axial compression remains a critical challenge, particularly due to the inherent class imbalance in experimental datasets. To address this issue, this study develops an efficient and interpretable machine learning (ML)-based classification framework for predicting the failure modes of rectangular CFST columns under axial compression. A comprehensive database comprising 597 experimental samples is first established by systematically compiling data from publicly available literature. To mitigate the adverse effects of data imbalance on classification accuracy, a hybrid data augmentation strategy (SMOTE-Tomek) is implemented during preprocessing. Six ML models are then systematically evaluated using multiple performance metrics to identify the optimal predictive model. The best-performing model is further analyzed using the SHapley Additive exPlanation (SHAP) approach to quantify the individual contributions of input features. Results demonstrate that the SMOTE-Tomek technique significantly enhances the prediction capability for minority classes, thereby improving the overall robustness of the classification framework. Among the evaluated models, the CatBoost algorithm outperforms others in accurately predicting the failure modes of CFST columns under axial compression. Furthermore, SHAP analysis identifies the height-to-width ratio (L/B) and the yield strength of steel tube (fy) as the two most influential features governing the failure mode classification of rectangular CFST columns.
Keyword ：
Axial compression Axial compression Class imbalance Class imbalance Concrete-filled steel tube column Concrete-filled steel tube column Failure mode prediction Failure mode prediction Machine learning Machine learning Shapley additive explanation Shapley additive explanation
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| GB/T 7714 | Zhong, Xueqi , Yu, Qiyao , Liao, Feiyu . Hybrid resampling-enhanced machine learning for failure mode prediction of axially compressed rectangular CFST columns with imbalanced data [J]. | STRUCTURES , 2025 , 80 . |
| MLA | Zhong, Xueqi et al. "Hybrid resampling-enhanced machine learning for failure mode prediction of axially compressed rectangular CFST columns with imbalanced data" . | STRUCTURES 80 (2025) . |
| APA | Zhong, Xueqi , Yu, Qiyao , Liao, Feiyu . Hybrid resampling-enhanced machine learning for failure mode prediction of axially compressed rectangular CFST columns with imbalanced data . | STRUCTURES , 2025 , 80 . |
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本实用新型公开了再生混凝土大构件霍普金森压杆系统三点弯曲实验装置，本方案装置巧妙性通过在机台上设置限位块，在限位块的其一侧面进一步设置一对相对设置的固定压头托架，再通过与霍普金森压杆系统的入射杆连接的活动压头对托架上的试样(活动压头和固定压头之间的试样)进行施加作用力，使得试样的三点弯曲试验不仅实施便利可靠，且本方案还在活动压头和入射杆之间通过过渡件来进一步安装力传感器，使得入射杆在施加作用力时，能够通过力传感器的反馈来及时、高效的记录试验参数。
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| GB/T 7714 | 陈宇峰 , 邱豪 , 廖飞宇 et al. 再生混凝土大构件霍普金森压杆系统三点弯曲实验装置 : CN202421548764.X[P]. | 2024-07-02 . |
| MLA | 陈宇峰 et al. "再生混凝土大构件霍普金森压杆系统三点弯曲实验装置" : CN202421548764.X. | 2024-07-02 . |
| APA | 陈宇峰 , 邱豪 , 廖飞宇 , 谢超杰 , 黄建明 , 李毅鑫 et al. 再生混凝土大构件霍普金森压杆系统三点弯曲实验装置 : CN202421548764.X. | 2024-07-02 . |
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