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学者姓名：赖志超
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Abstract ：
High-performance concrete-filled steel tube (CFST) members consisting of high-strength steel and ultra-high performance concrete (UHPC) are more and more widely applied in modern engineering structures. These structures/structural components may suffer from axial impact loading during its life cycle such as impact induced by the collapse of top-level floors. However, the design and evaluation methods for axial impact resistance remain unclear for these structures. This paper presented a systematic study on both the impact and post-impact resistances of high-performance CFST members subjected to axial impact. A database of CFST members subjected to axial impact was first compiled, and a finite element (FE) model was established and verified by the test results from the compiled database. The effects of key parameters on the impact resistances and residual capacity of square UHPC-filled high-strength steel tubes under axial impact were clarified. By employing 420 FE models of square CFST columns subjected to axial impact with random parameters, equations for predicting the maximum axial displacement under axial impact and axial residual bearing capacity after axial impact that are suitable for conventional and high-performance CFST columns (fy <= 960 MPa and fcu <= 200 MPa) were developed with reasonable accuracy. Finally, a maximum deformation limit was recommended for CFST components subjected to axial impact, which provides a reference for anti-impact design and evaluation for general high-performance CFST members.
Keyword ：
Axial impact resistance Axial impact resistance Concrete-filled steel tube Concrete-filled steel tube High-strength steel High-strength steel Prediction method Prediction method Residual capacity Residual capacity
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| GB/T 7714 | Yang, Xiaoqiang , Zhu, Liguo , Bi, Kaiming et al. Design and evaluation methods for CFST members with high-performance materials subjected to axial impact [J]. | ENGINEERING STRUCTURES , 2025 , 327 . |
| MLA | Yang, Xiaoqiang et al. "Design and evaluation methods for CFST members with high-performance materials subjected to axial impact" . | ENGINEERING STRUCTURES 327 (2025) . |
| APA | Yang, Xiaoqiang , Zhu, Liguo , Bi, Kaiming , Zhao, Hui , Zhu, Yong , Lai, Zhichao . Design and evaluation methods for CFST members with high-performance materials subjected to axial impact . | ENGINEERING STRUCTURES , 2025 , 327 . |
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High-strength materials and corresponding composite members are gradually accepted in the bridge industry to achieve the purposes of large span and lightweight. Three simply supported I-shaped steel-concrete composite beams were tested to investigate their flexural behavior when different combinations of materials were used, i.e., high-strength steel-ultra high performance concrete (HS-UHPC), high-strength steel-conventional strength concrete (HS-CC), and conventional strength steel-ultra high performance concrete (CS-UHPC). The test finds that the HS-UHPC composite beam has the highest flexural strength and reasonable plastic deformation ability as compared to the other two beams. A finite element (FE) model was also constructed and benchmarked. Subsequently, the model was utilized to conduct parametric studies, aimed at exploring in-depth the flexural behavior of steel-concrete composite beams. The results from the tests and FE analyses were employed to assess the suitability of existing design specifications (i.e., AISC 360-22, GB 50017-2017, and Eurocode 4) in estimating the flexural strength of HS-UHPC composite beams. The evaluations indicated that GB 50017-2017 can reasonably estimate the flexural strength of HS-UHPC composite beams. This research provides valuable insights into the design and construction of HS-UHPC composite beams in bridges.
Keyword ：
Composite beam Composite beam Design Design Flexural behavior Flexural behavior High strength steel High strength steel UHPC UHPC
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| GB/T 7714 | Lai, Zhichao , Yao, Pengyu , Yang, Xiaoqiang et al. Flexural behavior and design of high-strength I-shaped steel-UHPC composite beams [J]. | ADVANCES IN STRUCTURAL ENGINEERING , 2025 . |
| MLA | Lai, Zhichao et al. "Flexural behavior and design of high-strength I-shaped steel-UHPC composite beams" . | ADVANCES IN STRUCTURAL ENGINEERING (2025) . |
| APA | Lai, Zhichao , Yao, Pengyu , Yang, Xiaoqiang , Li, Shihui , Zhao, Qiu . Flexural behavior and design of high-strength I-shaped steel-UHPC composite beams . | ADVANCES IN STRUCTURAL ENGINEERING , 2025 . |
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This study investigates the cyclic behavior of high-strength square concrete-filled steel tube (HS-SCFST) beamcolumns through experimental testing of 9 specimens and complementary finite element analysis. The specimens were subjected to constant axial load and cyclic flexural loading, with test parameters including axial compression ratio, steel yield stress, concrete compressive strength, and width-to-thickness ratio. The finite element models were benchmarked for parametric studies. The results showed the axial compression ratio influenced ultimate strength and envelope curve shape, while increased steel/concrete strength improved strength and energy dissipation capacity. However, higher slenderness and width-to-thickness ratios decreased strength, ductility, and stiffness notably. Evaluation of building codes GB50936, EC4, AISC360-16, and AIJ showed EC4 was most reasonable, GB50936 most conservative as it neglects stress distribution between steel and concrete, and AISC 360-16 conservative as it excludes concrete contribution. The study indicates existing code provisions need improvement for calculating HS-SCFST member strength. Additionally, a simplified calculation model was proposed to determine envelope curves for HS-SCFST beam-columns based on the experimental and FE results. In summary, the study provided data on HS-SCFST cyclic behavior and code evaluations, proposing enhancements for design.
Keyword ：
Beam-columns Beam-columns Concrete-filled steel tube (CFST) Concrete-filled steel tube (CFST) Cyclic behavior Cyclic behavior Experimental tests Experimental tests Finite element analysis Finite element analysis High-strength materials High-strength materials
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| GB/T 7714 | Lai, Zhichao , Han, Wenbing , Wang, Ying et al. Cyclic behavior of high-strength square concrete filled steel tube (HS-SCFST) beam-columns [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 227 . |
| MLA | Lai, Zhichao et al. "Cyclic behavior of high-strength square concrete filled steel tube (HS-SCFST) beam-columns" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 227 (2025) . |
| APA | Lai, Zhichao , Han, Wenbing , Wang, Ying , Lin, Xueying , Yang, Yuxing , Zeng, Xiaoyong . Cyclic behavior of high-strength square concrete filled steel tube (HS-SCFST) beam-columns . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 227 . |
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The current AISC specification (AISC 360-22) does not permit using high-strength materials in steel plate-concrete composite (SC) walls due to limited research. This paper uses three steps to address this. In the first step, experimental tests on 13 high-strength SC walls are conducted. The test parameters are stud spacing, thickness of steel plate, yield stress of steel, and compressive strength of concrete. Results from the tests indicate that the axial compressive strength of SC walls increases when the material strength increases or when the slenderness ratio (i.e., ratio of the stud spacing to the thickness of steel faceplate) decreases. In the second step, finite element (FE) models are developed and benchmarked. Parametric studies are then conducted to further validate the findings from the tests and to develop effective stress-strain relationships for the steel faceplate. The resulting effective stress-strain relationship can be used in fiber-based analysis programs for better accuracy, since it implicitly accounts for the influence of local buckling and yielding. Finally, the effective stress-strain relationship is used to revise the equation in AISC 360-22. The accuracy of the revised equation is verified using results from both the experimental tests and FE parametric studies.
Keyword ：
Composite wall Composite wall Design Design High-strength steel High-strength steel Steel plate-concrete composite (SC) Steel plate-concrete composite (SC) Strength Strength Ultra-high-performance concrete (UHPC) Ultra-high-performance concrete (UHPC)
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| GB/T 7714 | Yao, Pengyu , Shi, Yuzhi , Lai, Zhichao et al. Experimental Test, Analysis, and Design of High-Strength SC Walls Subjected to Axial Compression [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2025 , 151 (4) . |
| MLA | Yao, Pengyu et al. "Experimental Test, Analysis, and Design of High-Strength SC Walls Subjected to Axial Compression" . | JOURNAL OF STRUCTURAL ENGINEERING 151 . 4 (2025) . |
| APA | Yao, Pengyu , Shi, Yuzhi , Lai, Zhichao , Guo, Juntao . Experimental Test, Analysis, and Design of High-Strength SC Walls Subjected to Axial Compression . | JOURNAL OF STRUCTURAL ENGINEERING , 2025 , 151 (4) . |
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Steel-ultra-high performance concrete (UHPC) composite walls can use high-strength tie bars (HBs) as shear connectors to satisfy the increased requirement of interfacial shear resistance. However, there is a lack of research on the shear behavior of HBs embedded in UHPC. To address it, this paper conducts 33 push-out tests, considering the effects of the following six parameters: yield stress and thickness of steel plates, yield stress and diameter of tie bars, and compressive strength and fiber content of concrete. Test results demonstrate that: (i) the failure modes include shear failure of tie bars (for specimens using UHPC with steel fibers) and splitting failure of concrete (for the other specimens), these are different from the traditional failure modes of shear studs embedded in conventional-strength concrete and should be considered in design; and (ii) using UHPC or using tie bars with higher yield stress or larger diameters can remarkably improve the shear strength. The applicability of current design equations to estimate the shear strength of HBs embedded in concrete is also evaluated. It is shown that the accuracy of current design equations depends on the governing failure mode. When tie bar shear failure governs, AASHTO LRFD (AASHTO 2012) can accurately estimate the strength, while the other equations are quite conservative; when concrete splitting failure governs, all equations seem unconservative as they are based on concrete compression failure.
Keyword ：
High-strength High-strength Push-out test Push-out test Shear stiffness Shear stiffness Shear strength Shear strength Tie bar connector Tie bar connector UHPC UHPC
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| GB/T 7714 | Lai, Zhichao , Weng, Xiangyu , Li, Dong et al. Shear behavior of high-strength tie bar connectors embedded in UHPC [J]. | STRUCTURES , 2025 , 72 . |
| MLA | Lai, Zhichao et al. "Shear behavior of high-strength tie bar connectors embedded in UHPC" . | STRUCTURES 72 (2025) . |
| APA | Lai, Zhichao , Weng, Xiangyu , Li, Dong , Li, Langfu . Shear behavior of high-strength tie bar connectors embedded in UHPC . | STRUCTURES , 2025 , 72 . |
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This paper investigates the axial compressive behavior of concrete-filled steel tube (CFT) columns with embedded FRP tubes by the following three steps: (i) compiling a comprehensive experimental database consisting of 47 tests, (ii) conducting 294 parametric analyses using benchmarked FE models to investigate the effect of relative strength factor on the strength enhancement ratio, and (iii) evaluating current design equations using the results from the database and FE parametric analyses. The insufficiencies of current equations were identified, leading to the development of a new unified design equation. This proposed design equation explicitly accounts for the strength enhancement achieved by embedding FRP tubes into CFT columns, providing improved accuracy in estimating the axial compressive strength of SCFC columns over a wider range of material strength and geometric parameters (e.g., yield strength of steel and compressive strength of concrete up to 960 MPa and 100 MPa, respectively).
Keyword ：
Columns Columns Concrete-filled steel tube (CFT) Concrete-filled steel tube (CFT) Fiber reinforced polymer (FRP) Fiber reinforced polymer (FRP) Finite element analysis Finite element analysis Unified design equation Unified design equation
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| GB/T 7714 | Yan, Jie , Lai, Zhichao , Jiang, Longfeng et al. Unified design equation of square concrete-filled steel tube columns with embedded circular FRP tubes [J]. | STRUCTURES , 2025 , 71 . |
| MLA | Yan, Jie et al. "Unified design equation of square concrete-filled steel tube columns with embedded circular FRP tubes" . | STRUCTURES 71 (2025) . |
| APA | Yan, Jie , Lai, Zhichao , Jiang, Longfeng , Zhu, Xianhao . Unified design equation of square concrete-filled steel tube columns with embedded circular FRP tubes . | STRUCTURES , 2025 , 71 . |
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This paper investigates the axial compressive behavior of an innovative composite wall consisting of stainlessclad bimetallic steel faceplates and ultra-high performance concrete (UHPC) infill. The innovative wall can address three major challenges of traditional steel-concrete composite walls, i.e., rapid degradation of the lateral stiffness, insufficient ductility of the concrete infill, and limited corrosion resistance of steel faceplates. A total of 12 tests were first conducted, considering the effects of normalized faceplate slenderness ratio (7), concrete type, and steel type. Finite element models were then developed and benchmarked for parametric studies. Results from tests and parametric analysis showed that: (1) failure modes of the composite wall were local buckling of steel faceplate and concrete crushing; (2) increasing 7 significantly reduced the axial compressive strength of the composite wall and critical buckling stress of the steel faceplate, but had a negligible effect on the axial stiffness; (3) UHPC greatly improved the compressive strength and axial stiffness of the composite wall, but also resulted in a more brittle behavior. Finally, the applicability of current design provisions (i.e., CECS:546-2018, Eurocode 4, and AISC 360-22) for estimating the axial compressive strength was evaluated, and a new design equation was proposed.
Keyword ：
Bimetallic steel Bimetallic steel Composite walls Composite walls Compressive strength Compressive strength Critical buckling stress Critical buckling stress Design equation Design equation UHPC UHPC
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| GB/T 7714 | Guo, Juntao , Lai, Zhichao , Wang, Ying et al. Compressive behavior of stainless-clad bimetallic steel plate-UHPC composite walls [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 230 . |
| MLA | Guo, Juntao et al. "Compressive behavior of stainless-clad bimetallic steel plate-UHPC composite walls" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 230 (2025) . |
| APA | Guo, Juntao , Lai, Zhichao , Wang, Ying , Yao, Pengyu , Lin, Shulin , Lin, Zhennan . Compressive behavior of stainless-clad bimetallic steel plate-UHPC composite walls . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 230 . |
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Abstract ：
高强方钢管超高性能混凝土构件在大跨桥梁、超高层建筑等工程中均有着广泛的应用前景.为研究高强方钢管超高性能混凝土短柱的轴压力学性能,设计制作了 16根方钢管混凝土短柱,并对其开展轴压试验,研究了混凝土抗压强度、钢管屈服强度、截面宽厚比等参数对其轴压性能的影响.通过ABAQUS有限元软件对试件进行非线性有限元分析和参数分析,以明确高强方钢管超高性能混凝土轴压短柱的受力机理.研究结果表明:高强方钢管超高性能混凝土短柱轴压性能良好;提高混凝土抗压强度可显著提升轴压承载力和刚度,且对延性影响不大;提高钢材屈服强度可提升承载力,但对轴压刚度和延性的影响较小;减小截面宽厚比可提升轴压承载力、刚度和延性,并延缓局部屈曲和剪切破坏.最后,将已有试验统计数据和所得试验结果与中国规范GB 50936-2014、欧洲规范EC4(2004)和美国规范AISC 360-22中相关公式的计算结果进行对比,发现GB 50936-2014对高强方钢管超高性能混凝土短柱轴压承载力的预测偏差较大,欧洲规范EC4(2004)的预测不够安全,且无法考虑钢管局部失稳的影响;美国规范AISC 360-22的计算结果与试验结果较为接近,且考虑了钢管局部失稳的影响.
Keyword ：
方钢管混凝土 方钢管混凝土 桥梁工程 桥梁工程 超高性能混凝土 超高性能混凝土 轴压试验 轴压试验
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| GB/T 7714 | 赖志超 , 董翠芬 , 林玉煌 et al. 高强方钢管超高性能混凝土短柱轴压性能研究 [J]. | 中国公路学报 , 2025 , 38 (3) : 343-353 . |
| MLA | 赖志超 et al. "高强方钢管超高性能混凝土短柱轴压性能研究" . | 中国公路学报 38 . 3 (2025) : 343-353 . |
| APA | 赖志超 , 董翠芬 , 林玉煌 , 王莹 , 陈宝春 , 李文勃 . 高强方钢管超高性能混凝土短柱轴压性能研究 . | 中国公路学报 , 2025 , 38 (3) , 343-353 . |
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在结构动力冲击响应分析中,通常采用动力放大系数(DAF)简化计算结构的动力响应.但是,目前工程结构中对DAF的取值还存在争议.针对此问题,本文推导了多自由度(MDOF)体系的DAF解析表达式,分析了DAF大于2.0的前提条件;分别通过单自由度(SDOF)体系和MDOF体系算例模型验证了解析表达式的准确性,解释了MDOF体系的DAF大于2.0的原因.基于所提出的DAF解析表达式分析了张弦梁剩余结构在断索冲击作用下的DAF分布规律.分析结果表明:当某一阶模态振型的分量与静力响应值反向时,张弦梁的DAF可能会大于 2.0;即使在有阻尼情况下,张弦梁的DAF也可能会大于2.0.
Keyword ：
动力放大系数 动力放大系数 多自由度体系 多自由度体系 张弦梁 张弦梁 断索冲击 断索冲击
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| GB/T 7714 | 张超 , 周桢干 , 赖志超 et al. 多自由度体系的动力放大系数解析研究 [J]. | 振动工程学报 , 2025 , 38 (3) : 550-557 . |
| MLA | 张超 et al. "多自由度体系的动力放大系数解析研究" . | 振动工程学报 38 . 3 (2025) : 550-557 . |
| APA | 张超 , 周桢干 , 赖志超 , 付馨迪 , 杨晓强 . 多自由度体系的动力放大系数解析研究 . | 振动工程学报 , 2025 , 38 (3) , 550-557 . |
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Current studies indicate that the axial compressive strength of circular concrete-filled steel tube columns can be enhanced by embedding circular FRP tubes. However, this strength enhancement would diminish when using FRP tubes with smaller thickness or diameter. Because of a lack of adequate research, the threshold at which the strength enhancement effect starts to dominate remains unclear. This threshold is important for engineers because it can be established as the minimum strength enhancement limit in designing circular concrete-filled steel tube columns with embedded circular FRP tubes. To address this knowledge gap, this paper conducted comprehensive parametric analyses by using the benchmarked finite element models. The analytical parametric results were obtained and used to quantify the relationship between the strength enhancement ratio and the relative strength factor (i.e., Eq. 8 in this paper). Based on this relationship, a unified design equation was proposed to estimate the axial compressive strength of circular concrete-filled steel tube columns with embedded circular FRP tubes. It is calculated as the axial compressive strength of circular CFT columns using the AIJ design equation multiplied by the strength enhancement factor. The proposed design equation offers more accurate strength predictions than the current design equation and covers a wider range of material strength and geometric parameters (e.g., steel yield stress and concrete compressive strength up to 960 MPa and 120 MPa, respectively).
Keyword ：
Circular concrete-filled steel tube (CFT) Circular concrete-filled steel tube (CFT) Columns Columns fiber reinforced polymer (FRP) fiber reinforced polymer (FRP) Strength enhancement Strength enhancement Unified design equation Unified design equation
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| GB/T 7714 | Yan, Jie , Lai, Zhichao , Wang, Jiali et al. A unified design equation to estimate the axial compressive strength of circular concrete-filled steel tube columns with embedded circular FRP tubes [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 232 . |
| MLA | Yan, Jie et al. "A unified design equation to estimate the axial compressive strength of circular concrete-filled steel tube columns with embedded circular FRP tubes" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 232 (2025) . |
| APA | Yan, Jie , Lai, Zhichao , Wang, Jiali , Shen, Yaning , Zhou, Zhengan . A unified design equation to estimate the axial compressive strength of circular concrete-filled steel tube columns with embedded circular FRP tubes . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 232 . |
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