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学者姓名：袁辉辉
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Abstract ：
钢管混凝土(CFST)混合柱是在柱底一定高度内采用钢筋混凝土(RC)腹板、其余节段采用空钢管缀杆连接CFST柱肢的一种新型组合结构.为研究CFST混合柱的抗震性能,以RC腹板高度系数(腹板高度与柱高的比值)和柱肢纵向间距为参数,进行了 6个CFST混合柱试件的拟静力试验.研究结果表明:水平低周反复荷载作用下,CFST混合柱的抗震性能良好,荷载-位移滞回曲线呈饱满梭形,主要破坏形式表现为格构段的剪切型破坏、柱肢塑性铰区域钢管的局部鼓曲变形以及RC腹板顶部刚度过渡段混凝土开裂、剥落;当RC腹板高度系数从 0.0变化到 0.3时,CFST混合柱的塑性铰区域由柱底截面上移至RC腹板顶部,试件弹性刚度和水平峰值荷载分别增大了约 53%和 31%,极限位移延性系数略微提高了约 5%;而当RC腹板高度系数从 0.3变化至 0.7时,CFST混合柱的塑性铰区域均出现在RC腹板顶部,试件弹性刚度和水平峰值荷载显著增大,分别增加了约 172%和 98%,相同位移下的累积滞回耗能也明显增加,但极限位移延性系数减少了约 16%;当柱肢纵向间距从 650 mm减小至 250 mm,柱肢塑性铰区域由RC腹板顶部转移至柱底截面,且结构的破坏形态逐渐转变为整体失稳破坏,弹性刚度和水平峰值荷载分别减小了约 67%和 47%.根据结构受力特点,提出了CFST混合柱水平承载力计算方法,得到的计算值与试验值吻合较好.
Keyword ：
抗震性能 抗震性能 拟静力试验 拟静力试验 柱肢纵向间距 柱肢纵向间距 水平承载力 水平承载力 腹板高度系数 腹板高度系数 钢管混凝土混合柱 钢管混凝土混合柱
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| GB/T 7714 | 袁辉辉 , 程军 , 吴庆雄 et al. 钢管混凝土混合柱抗震性能试验研究 [J]. | 工程力学 , 2025 , 42 (3) : 167-180 . |
| MLA | 袁辉辉 et al. "钢管混凝土混合柱抗震性能试验研究" . | 工程力学 42 . 3 (2025) : 167-180 . |
| APA | 袁辉辉 , 程军 , 吴庆雄 , 杜雨鸿 , 陈宝春 , 吴祎贤 . 钢管混凝土混合柱抗震性能试验研究 . | 工程力学 , 2025 , 42 (3) , 167-180 . |
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Abstract ：
To study the eccentric compression performance of UHPC-encased concrete-filled steel tube composite medium-long columns (referred to as ‘UC-CFST medium-long columns’), the eccentricity (0. 52 and 1. 04) and slenderness ratio (7. 22-44. 74) were selected as the main parameters, and a total of 18 UC-CFST medium-long column specimens were tested under eccentric compression loads, and the failure mode and eccentric compression performance index were obtained. The results reveal that with the increase of eccentricity and slenderness ratio, the failure mode of UC-CFST medium-long columns changes from material strength failure to instability failure, and the bearing capacity of specimens is significantly reduced. The specimens with a slenderness ratio less than or equal to 21. 03 exhibit obvious material strength failure characteristics. The steel bars and steel tubes on the near load side of the small eccentric compression specimens first undergo compression yielding, while the UHPC outer layer in the tensile zone of the large eccentric compression specimens cracks, and the steel tubes yield in tension. When the peak load is reached, the UHPC in the compressive zone of the large and small eccentric compression specimens is crushed. The specimens with a slenderness ratio greater than 35. 26 are subjected to elastic-plastic instability failure, while a specimen with a slenderness ratio between 21. 03 and 35. 26 is subjected to plastic instability failure. Finally, the applicability of the bending moment amplification factor method for concrete-encased CFST columns proposed in GB/ T 51446—2021‘Technical standard for concrete-filled steel tubular hybrid structures’ to calculate the eccentric compression bearing capacity of UC-CFST medium-long columns is discussed. It is found that this method will significantly overestimate the eccentric compression bearing capacity of UC-CFST medium-long columns. Therefore, combined with the mechanical characteristics of UC-CFST medium-long columns, an improved moment amplification factor method which can be used to calculate the eccentric compression bearing capacity of UC-CFST medium-long columns is derived in this paper. The calculation results correspond well with the experimental results. © 2024 Science Press. All rights reserved.
Keyword ：
Bending strength Bending strength Bond strength (materials) Bond strength (materials) Columns (structural) Columns (structural) Compression testing Compression testing Compressive strength Compressive strength Electric towers Electric towers Fracture mechanics Fracture mechanics Pressure vessel codes Pressure vessel codes Religious buildings Religious buildings Solar buildings Solar buildings Tubular steel structures Tubular steel structures Uranium carbide Uranium carbide Water towers Water towers
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| GB/T 7714 | Wu, Qingxiong , Xu, Zhikun , Cheng, Jun et al. Experimental study on eccentric compression performance of UHPC-encased CFST composite medium-long columns [J]. | Journal of Building Structures , 2024 , 45 (9) : 76-88 . |
| MLA | Wu, Qingxiong et al. "Experimental study on eccentric compression performance of UHPC-encased CFST composite medium-long columns" . | Journal of Building Structures 45 . 9 (2024) : 76-88 . |
| APA | Wu, Qingxiong , Xu, Zhikun , Cheng, Jun , Yuan, Huihui , Qin, Zhiqing . Experimental study on eccentric compression performance of UHPC-encased CFST composite medium-long columns . | Journal of Building Structures , 2024 , 45 (9) , 76-88 . |
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Abstract ：
To study the shear behavior of RC-encased CFST columns with interfacially welded annular rebars, the transverse shear static test and numerical simulation of six composite column specimens were carried out with the spacing and the diameter of annular rebars as research parameters, and the influence laws of various parameters on failure process, failure mode, load-midspan deflection curve and shear bearing capacity of the specimens were investigated. The results show that the failure modes of composite columns with different arrangements of interface annular rebars were basically the same, and all of them exhibited oblique pressure failure. The stress process of the specimen can be divided into four stages: elastic stage, elasto-plastic stage, hardening stage and failure stage. With the decrease of the spacing of interface annular rebars, the shear bearing capacity of the specimen was significantly improved, with the maximum increase of 22%. Increasing the diameter of interface annular rebars can improve the shear capacity of the specimen, but the effect was limited, and the maximum increase was only 6.1%. The validity of the finite element model was verified by the experimental data, and the stress states of the finite element model at different stages were further analyzed, and the shear mechanism of this kind of composite column was clarified. © 2024 Tsinghua University. All rights reserved.
Keyword ：
Bearing capacity Bearing capacity Concretes Concretes Ductile fracture Ductile fracture Failure modes Failure modes Finite element method Finite element method Shear flow Shear flow Tubular steel structures Tubular steel structures
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| GB/T 7714 | Cheng, Jun , Xu, Zhi-Kun , Wu, Qing-Xiong et al. STUDY ON SHEAR PERFORMANCE OF RC-ENCASED CFST COLUMNS WITH INTERFACIALLY WELDED ANNULAR REBARS [J]. | Engineering Mechanics , 2024 , 41 : 142-149 . |
| MLA | Cheng, Jun et al. "STUDY ON SHEAR PERFORMANCE OF RC-ENCASED CFST COLUMNS WITH INTERFACIALLY WELDED ANNULAR REBARS" . | Engineering Mechanics 41 (2024) : 142-149 . |
| APA | Cheng, Jun , Xu, Zhi-Kun , Wu, Qing-Xiong , Yuan, Hui-Hui . STUDY ON SHEAR PERFORMANCE OF RC-ENCASED CFST COLUMNS WITH INTERFACIALLY WELDED ANNULAR REBARS . | Engineering Mechanics , 2024 , 41 , 142-149 . |
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Abstract ：
To study the eccentric compression performance and failure mechanism of ultra-high performance concrete (UHPC) encased concrete-filled steel tubular (CFST) medium-long columns (UC-CFST medium-long columns), a total of 27 UC-CFST column specimens were tested under eccentric compression with eccentricity and slenderness ratio as the main parameters. After verified by experimental results, the finite element (FE) analysis of UC-CFST medium-long columns with actual structural cross-sectional size under eccentric compression was further carried out. It is found that as the slenderness ratio and eccentricity increased, the bending stiffness and the ultimate bearing capacity of the UC-CFST columns decreased gradually, and the failure mode changed from strength failure to instability failure, and the smaller the proportion of encasing UHPC area, the greater the upper-bound slenderness ratio of strength failure. Moreover, the influence of eccentricity was nonlinearly coupled with slenderness ratio on the eccentric compressive bearing capacity of UC-CFST medium-long columns. Finally, a calculation method of ultimate load-bearing capacity of UC-CFST medium-long columns considering the influence of eccentricity and slenderness ratio was proposed, which had good calculation accuracy with experimental and numerical results.
Keyword ：
CFST CFST Eccentric compression test Eccentric compression test Finite element analysis Finite element analysis UHPC-encased UHPC-encased Ultimate bearing capacity Ultimate bearing capacity
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| GB/T 7714 | Xu, Zhikun , Cheng, Jun , Yuan, Huihui et al. Mechanical behavior of eccentrically loaded UHPC-encased CFST medium-long columns [J]. | ENGINEERING STRUCTURES , 2024 , 315 . |
| MLA | Xu, Zhikun et al. "Mechanical behavior of eccentrically loaded UHPC-encased CFST medium-long columns" . | ENGINEERING STRUCTURES 315 (2024) . |
| APA | Xu, Zhikun , Cheng, Jun , Yuan, Huihui , Wu, Qingxiong , Qin, Zhiqing . Mechanical behavior of eccentrically loaded UHPC-encased CFST medium-long columns . | ENGINEERING STRUCTURES , 2024 , 315 . |
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To investigate the matching relationship between steel ratio and core concrete strength in the ultra -high strength concrete -filled steel tubular (UHSCFST) columns, a total of 40 stub column specimens, considering eight different steel ratios (ranging from 5.97% to 38.72%) and three grades of high -strength concrete (C60, C80, and C100), were tested under axial compression. The results revealed that under axial compression loads, as the steel ratio of the cross-section increased from low to high, the local buckling characteristics on the surface of UHSCFST stub columns gradually diminished, transitioning from shear failure to local buckling and bulging failure. With the improvement of the strength grade of the core concrete, the steel ratio that ensures the full confining effect of the steel tube should also be increased significantly. For the specimens filled with C60, C80, and C100 concrete, the threshold value of the steel ratio that can ensure the axial compressive strength of the specimen does not decrease after reaching the peak load was 13.87%, 20.24%, and 27.16%, respectively. By comparing with the experimental data, it is found that the CFST composite strength formula recommended by the current Chinese code did not apply to UHSCFST members. Based on the regression fitting of experimental data, the formula for calculating the composite strength of UHSCFST members and the ultimate strength of UHSCFST stub columns were proposed.
Keyword ：
Composite strength Composite strength Ductility Ductility Failure mode Failure mode Steel ratio Steel ratio Ultra -high strength concrete Ultra -high strength concrete
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| GB/T 7714 | Zhou, Xiaojun , Bai, Shiming , Yuan, Huihui et al. Matching relationship study between steel ratio and core concrete strength in UHSCFST stub columns [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
| MLA | Zhou, Xiaojun et al. "Matching relationship study between steel ratio and core concrete strength in UHSCFST stub columns" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 219 (2024) . |
| APA | Zhou, Xiaojun , Bai, Shiming , Yuan, Huihui , Liang, Jian , Mou, Tingmin . Matching relationship study between steel ratio and core concrete strength in UHSCFST stub columns . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
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Abstract ：
针对我国现行抗震设计规范尚未明确给出钢筋混凝土(RC)薄壁空心高墩塑性铰长度计算方法的问题,首先收集整理了既有RC桥墩塑性铰长度计算方法以及试验数据,分析影响塑性铰计算长度的主要因素;同时对实际桥梁工程采用的RC薄壁空心墩构造参数进行统计归纳.在验证有限元建模方法准确性后,采用ABAQUS软件建立了高度为40～120 m的8种典型RC薄壁空心高墩的精细化有限元模型,并开展非线性推覆分析,得到不同高度桥墩的等效塑性铰长度.最后讨论不同塑性铰长度计算方法的适用性,发现Eurocode 8规范的计算公式精度最高,可用于计算RC薄壁空心高墩的塑性铰长度.
Keyword ：
塑性铰长度 塑性铰长度 有限元分析 有限元分析 连续刚构桥 连续刚构桥 钢筋混凝土薄壁空心高墩 钢筋混凝土薄壁空心高墩
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| GB/T 7714 | 袁辉辉 , 程军 , 蔡丁锡 et al. 钢筋混凝土薄壁空心高墩塑性铰长度计算方法 [J]. | 福州大学学报（自然科学版） , 2024 , 52 (5) : 577-586 . |
| MLA | 袁辉辉 et al. "钢筋混凝土薄壁空心高墩塑性铰长度计算方法" . | 福州大学学报（自然科学版） 52 . 5 (2024) : 577-586 . |
| APA | 袁辉辉 , 程军 , 蔡丁锡 , 吴庆雄 , 詹远辉 , 袁朝阳 . 钢筋混凝土薄壁空心高墩塑性铰长度计算方法 . | 福州大学学报（自然科学版） , 2024 , 52 (5) , 577-586 . |
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Abstract ：
本实用新型属于桥梁工程技术领域，尤其涉及一种采用外包UHPC钢管连接的装配式混凝土桥墩及其施工方法。本实用新型通过在开槽承台单元上设置底部节段单元、外包UHPC钢管单元，以及锚固件单元的方式，使得装配式混凝土桥墩中，节段与承台之间的连接结构强度更大，受力部位更加分散，桥墩整体抗冲击能力更强。
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| GB/T 7714 | 唐瑜 , 吴庆雄 , 袁辉辉 et al. 一种采用外包UHPC钢管连接的装配式混凝土桥墩 : CN202222582921.6[P]. | 2022-09-29 00:00:00 . |
| MLA | 唐瑜 et al. "一种采用外包UHPC钢管连接的装配式混凝土桥墩" : CN202222582921.6. | 2022-09-29 00:00:00 . |
| APA | 唐瑜 , 吴庆雄 , 袁辉辉 , 杨益伦 . 一种采用外包UHPC钢管连接的装配式混凝土桥墩 : CN202222582921.6. | 2022-09-29 00:00:00 . |
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本实用新型属于桥梁工程技术领域，尤其涉及一种用于装配式混凝土桥墩的外包UHPC钢管连接件。本实用新型提供一种用于装配式混凝土桥墩的外包UHPC钢管连接件，其能通过在钢管单元上设置钢筋笼单元、上UHPC层单元，以及开孔钢板单元的方式，保证在承台和桥墩节段之间，提供更加高强度、更加稳定的连接效果。
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| GB/T 7714 | 杨益伦 , 吴庆雄 , 詹远辉 et al. 一种用于装配式混凝土桥墩的外包UHPC钢管连接件 : CN202222583217.2[P]. | 2022-09-29 00:00:00 . |
| MLA | 杨益伦 et al. "一种用于装配式混凝土桥墩的外包UHPC钢管连接件" : CN202222583217.2. | 2022-09-29 00:00:00 . |
| APA | 杨益伦 , 吴庆雄 , 詹远辉 , 袁辉辉 . 一种用于装配式混凝土桥墩的外包UHPC钢管连接件 : CN202222583217.2. | 2022-09-29 00:00:00 . |
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Abstract ：
本实用新型属于桥梁工程技术领域，尤其涉及一种钢管‑管内预应力钢束连接的装配式混凝土桥墩。本实用新型通过在现浇承台单元上设置若干个预制节段单元，并在相邻预制节段单元之间设置现浇节段单元、在所有预制节段单元的整体上设置管内混凝土钢束单元的方式，保证该装配式混凝土桥墩的结构整体性更高，连接强度更大，支撑稳定性更好。
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| GB/T 7714 | 吴庆雄 , 陈骥 , 袁辉辉 et al. 一种钢管-管内预应力钢束连接的装配式混凝土桥墩 : CN202222587779.4[P]. | 2022-09-29 00:00:00 . |
| MLA | 吴庆雄 et al. "一种钢管-管内预应力钢束连接的装配式混凝土桥墩" : CN202222587779.4. | 2022-09-29 00:00:00 . |
| APA | 吴庆雄 , 陈骥 , 袁辉辉 , 李毅 , 杨益伦 . 一种钢管-管内预应力钢束连接的装配式混凝土桥墩 : CN202222587779.4. | 2022-09-29 00:00:00 . |
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Abstract ：
To enhance the axial compressive bearing capacity and durability of concrete-encased concrete-filled steel tubular columns (referred to as OC-CFST columns), a novel approach utilizing ultra-high performance concrete (UHPC) encased CFST (UC-CFST columns for short) was proposed. A total of 22 stub column specimens were tested under axial compression, including nine UC-CFST columns, nine OC-CFST columns, and four CFST columns. The investigation aimed to assess the impact of encasing material strength and area ratio on the axial compressive performance and failure mode. Finite element models of the UC-CFST stub column were established using ABAQUS, and a parameter analysis of axial compression performance was conducted on the stub columns with real structural dimensions. The results reveal that during failure of OC-CFST stub columns, the encasing ordinary concrete suffers extensive peeling, while UC-CFST stub columns experience relatively intact due to the bridging effect of steel fibers within the UHPC. Compared to the OC-CFST stub columns, the UC-CFST stub columns exhibit significantly improving axial compressive stiffness and axial compressive bearing capacity, and reach axial compressive bearing capacity when the UHPC encasing reaches its peak compressive strain. Furthermore, while maintaining the outer diameter of composite columns constant, the axial compressive bearing capacity of UC-CFST stub columns demonstrate an approximately linear increase with the rise in area ratio of encasing concrete, while the OC-CFST stub columns exhibit a linear decreasing trend. Finally, the applicability of using the formula in the current technical specifications for steel tube-reinforced concrete column structures to calculate the axial compressive bearing capacity of UC-CFST stub columns was analyzed. Based on this formula, it was recommended not to consider the additional coefficient of 0. 9 and a new calculation method was proposed to accurately determine the axial compressive bearing capacity of UC-CFST stub columns. © 2023 Science Press. All rights reserved.
Keyword ：
ABAQUS ABAQUS Axial compression Axial compression Bearing capacity Bearing capacity Columns (structural) Columns (structural) Compression testing Compression testing Failure (mechanical) Failure (mechanical) Finite element method Finite element method High performance concrete High performance concrete Reinforced concrete Reinforced concrete Steel fibers Steel fibers Tubular steel structures Tubular steel structures
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| GB/T 7714 | Wu, Qingxiong , Xu, Zhikun , Yuan, Huihui et al. Experimental study of axial compressive performance of UHPC-encased CFST composite stub columns [J]. | Journal of Building Structures , 2023 , 44 (12) : 183-193 . |
| MLA | Wu, Qingxiong et al. "Experimental study of axial compressive performance of UHPC-encased CFST composite stub columns" . | Journal of Building Structures 44 . 12 (2023) : 183-193 . |
| APA | Wu, Qingxiong , Xu, Zhikun , Yuan, Huihui , Qin, Zhiqing . Experimental study of axial compressive performance of UHPC-encased CFST composite stub columns . | Journal of Building Structures , 2023 , 44 (12) , 183-193 . |
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