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学者姓名：邓宗才
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摘要 ：
The ultra-high performance concrete (UHPC) mixed with hybrid fibers has excellent mechanical properties and durability, and the hybrid fibers have a certain impact on the bearing capacity, deformation capacity, and crack propagation of beams. Many scholars have conducted a series of studies on the bending performance of prestressed UHPC beams, but there are few studies on prestressed UHPC beams mixed with hybrid fibers. In this study, five bonded post-tensioned partially prestressed UHPC beams mixed with steel fibers and macro-polyolefin fibers were poured and subjected to four-points symmetric loading bending tests. The effects of different prestressing degrees and prestressing levels on the load-deflection curves, crack propagation, failure modes and ultimate bearing capacity of beams were discussed. The results showed that flexural failure occurred in the prestressed UHPC beams with hybrid fibers, and the integrity of specimens was good. When the prestressing degree was the same, the higher the prestressing level, the better the crack resistance capacity of UHPC beams; When the prestressing level was 90%, increasing the prestressing degree was beneficial to improve the crack resistance and ultimate bearing capacity of UHPC beams. When the prestressing degree increased from 0.41 to 0.59, the cracking load and ultimate load increased by 66.0% and 41.4%, respectively, but the ductility decreased by 61.2%. Based on the plane section assumption and considering the bridging effect of short fibers, the cracking moment and ultimate bearing moment were calculated, with good agreement between the test and calculated values.
关键词 ：
UHPC beams UHPC beams prestressing levels prestressing levels flexural behavior flexural behavior prestressing degrees prestressing degrees hybrid fibers hybrid fibers
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| GB/T 7714 | Deng, Zongcai , Li, Qian , Tuladhar, Rabin et al. Flexural performance of prestressed UHPC beams with different prestressing degrees and levels [J]. | COMPUTERS AND CONCRETE , 2024 , 34 (4) : 379-391 . |
| MLA | Deng, Zongcai et al. "Flexural performance of prestressed UHPC beams with different prestressing degrees and levels" . | COMPUTERS AND CONCRETE 34 . 4 (2024) : 379-391 . |
| APA | Deng, Zongcai , Li, Qian , Tuladhar, Rabin , Shi, Feng . Flexural performance of prestressed UHPC beams with different prestressing degrees and levels . | COMPUTERS AND CONCRETE , 2024 , 34 (4) , 379-391 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this study, an attempt was made to study the bond-slip performance of end-hook and half-hooked steel fibers embedded in moderately strength SIFCON matrix, to find out the cause of excessive mechanical anchorage and to further optimize the bond-slip equation of steel fibers. Used end-hook steel fibers with embedded depths 10 and 15 mm, pullout offset angles 0 degrees, 30 degrees, 45 degrees, and 60 degrees; Half-hooked steel fiber with embedded depths 10 and 15 mm, end-hook bending angles 30 degrees, 45 degrees, 60 degrees, and 90 degrees; Novel end-hook and novel half-hooked steel fibers with end-hook length doubled, which were subjected to a static pullout test at a rate of 0.01 mm/s. Experiments showed that the half-hooked steel fiber took the best end-hook bending angle at 60 degrees; The novel end-hook and half-hooked steel fiber had a good bonded performance. The single steel fiber anchorage performance evaluation index K was proposed. Through experimental phenomena, data analysis, and X-ray flaw detection, the existence of "local damage" was proved. Based on the traditional bond-slip formulation, a new bond-slip formulation for moderately strength SIFCON substrates is proposed by adding a plastic hinge in the "local damage" region. By comparing the old and new equation, it was found that the calculation error of the maximum pullout load of end-hook steel fibers was reduced by 3.77 times and that the calculation error of the maximum pullout load of half-hooked steel fibers was reduced by 2.8 times, and the calculation equation for the peak load of secondary reinforcement of half-hooked steel fiber was supplemented, which is of application value for further optimization of the shape of steel fibers.
关键词 ：
Novel end-hook and half-hooked steel fiber Novel end-hook and half-hooked steel fiber Bond-slip equation Bond-slip equation Local damage Local damage Slurry infiltrated fiber concrete Slurry infiltrated fiber concrete Bond-slip behavior Bond-slip behavior
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| GB/T 7714 | Wang, Liyang , Deng, Zongcai . Bond-slip response of end-hook and half-hooked steel fibers in moderately strong SIFCON matrix [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 405 . |
| MLA | Wang, Liyang et al. "Bond-slip response of end-hook and half-hooked steel fibers in moderately strong SIFCON matrix" . | CONSTRUCTION AND BUILDING MATERIALS 405 (2023) . |
| APA | Wang, Liyang , Deng, Zongcai . Bond-slip response of end-hook and half-hooked steel fibers in moderately strong SIFCON matrix . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 405 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Textile reinforced mortar (TRM) strengthening can improve the anti-aging performance of reinforced concrete (RC) slabs, and significantly improve the rust problem of steel plates and bending performance of RC slabs. To study the effect of TRM on the flexural capacity of two-way RC slab, four sided simply supported bending tests were conducted on two TRM strengthened concrete slabs and an unstrengthened control slab. And the effects of different strengthening techniques on the flexural capacity and bending deformation capacity of the two-way RC slabs were investigated. It was concluded that the application of TRM to strengthen the two-way RC slabs can effectively improve its bending bearing capacity and bending deformation capacity. Compared with the unstrengthened control slab, the bending bearing capacity of the two strengthened slabs increased by 54.2% and 43.8%, respectively, and the energy absorption value increased by 75.5% and 49.1%, respectively. In addition, compared with control slab, the post-cracking stiffness of TRM reinforced slabs treated with and without interface agents increased by 145.2% and 83.4%, respectively. This indicated that using interface agents for interface treatment could improve the adhesion between the TRM and the original RC slab, thereby preventing the initiation and development of cracks between the new and old interfaces. The strength utilization rate of textile was proposed, and the relationship between strength utilization rate of textile and maximum or minimum distribution network rate was analyzed. Based on the plastic hinge theory a simple calculation formula for the bending bearing capacity of the two-way RC slab strengthened with TRM was proposed, which provided the reference for the application of TRM for strengthening projects.
关键词 ：
Flexural capacity Flexural capacity The theory of plastic hinges The theory of plastic hinges Two-way slab Two-way slab Fiber strength utilization rate Fiber strength utilization rate Shear capacity Shear capacity Textile reinforced mortar Textile reinforced mortar
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| GB/T 7714 | Deng, Zongcai , Xia, Qian , Gong, Minggao et al. Flexural Strengthening of Two-Way RC Slabs with Textile Reinforced Mortar: Experimental Study and Calculation Model [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2023 , 27 (12) : 5268-5280 . |
| MLA | Deng, Zongcai et al. "Flexural Strengthening of Two-Way RC Slabs with Textile Reinforced Mortar: Experimental Study and Calculation Model" . | KSCE JOURNAL OF CIVIL ENGINEERING 27 . 12 (2023) : 5268-5280 . |
| APA | Deng, Zongcai , Xia, Qian , Gong, Minggao , Xu, Junlin . Flexural Strengthening of Two-Way RC Slabs with Textile Reinforced Mortar: Experimental Study and Calculation Model . | KSCE JOURNAL OF CIVIL ENGINEERING , 2023 , 27 (12) , 5268-5280 . |
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摘要 ：
Glass fiber-reinforced polymer (GFRP) composites are promising composites often utilized in coastal infrastructure or used as an alternative to steel reinforcement in seawater sea sand concrete due to their excellent corrosion resistance. Understanding the degradation mechanism of GFRP in corrosion environments is significant for improving the long-term performance of GFRP materials. This paper presented the influences of seawater content and temperature on the properties of GFRP composites using the molecular dynamics method. The simulation results were validated by existing experiments on mechanical properties, interlaminar strength, and microstructures of an accelerated aging test of GFRP. The calculation results indicated that when seawater content of the matrix increased from 0% to 9.09% at 298 K, Young's modulus, shear modulus, and bulk modulus decreased 46.72%, 53.46%, and 41.75%, respectively. The binding energy of GFRP composites with seawater content of 2.15% at 353 K was 26.46% lower than that of unconditioned GFRP at 298 K. It revealed that the higher seawater content and temperature accelerated the degradation of the GFRP composites. The investigation provided a comprehensive understanding of the degradation mechanism of GFRP in seawater environments and provided a basis for the durability design of GFRP composites.
关键词 ：
GFRP GFRP molecular dynamics molecular dynamics durability durability seawater seawater degradation degradation
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| GB/T 7714 | Zhang, Xiuli , Deng, Zongcai . Effects of Seawater Environment on the Degradation of GFRP Composites by Molecular Dynamics Method [J]. | POLYMERS , 2022 , 14 (14) . |
| MLA | Zhang, Xiuli et al. "Effects of Seawater Environment on the Degradation of GFRP Composites by Molecular Dynamics Method" . | POLYMERS 14 . 14 (2022) . |
| APA | Zhang, Xiuli , Deng, Zongcai . Effects of Seawater Environment on the Degradation of GFRP Composites by Molecular Dynamics Method . | POLYMERS , 2022 , 14 (14) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Ultra-High Performance Concrete (UHPC) is a new type of cement-based composite material that exhibits exceptional compressive strength, tensile properties and durability compared to ordinary concrete. Compre-hensive research on the flexural fatigue behavior of prestressed UHPC beams is presented in this paper. The failure mode of the fatigue beam is the fatigue fracture of the tensile steel bar in the pure bending section. In the fatigue process, the fatigue behaviors of prestressed UHPC beams including crack width, midspan deflection, the strain of UHPC in compression zone and strain of high-strength steel bars exhibit two stages which are corre-sponding to damage initiation, steady damage propagation. The residual deflection at the midspan increases with the increase of fatigue cycles. The prestressed UHPC beam reinforced with high-strength steel bars shows stable structural behavior even after concrete cracking. The S-N expression of prestressed UHPC beam with consid-eration of the influence of stress amplitude of high-strength steel bars is proposed. The stiffness degradation formula of the fatigue beam and calculation methods of fatigue crack width and fatigue deflection are proposed.
关键词 ：
High-strength steel bar High-strength steel bar UHPC UHPC S-N expression S-N expression Fatigue behavior Fatigue behavior
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| GB/T 7714 | Deng, Zongcai , Huang, Song , Wang, Yuanzuo et al. Experimental research on fatigue behavior of prestressed ultra-high performance concrete beams with high-strength steel bars [J]. | STRUCTURES , 2022 , 43 : 1778-1789 . |
| MLA | Deng, Zongcai et al. "Experimental research on fatigue behavior of prestressed ultra-high performance concrete beams with high-strength steel bars" . | STRUCTURES 43 (2022) : 1778-1789 . |
| APA | Deng, Zongcai , Huang, Song , Wang, Yuanzuo , Xue, Huiqing . Experimental research on fatigue behavior of prestressed ultra-high performance concrete beams with high-strength steel bars . | STRUCTURES , 2022 , 43 , 1778-1789 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
高强钢管约束超高性能混凝土(ultra-high performance concrete,UHPC)具有自重轻、承载力及刚度高和耐火性能好的优势,在工程中具有良好的应用前景.为研究高强钢管约束UHPC构件在纯弯作用下的力学性能,对1个实心普通强度钢管约束UHPC梁、3个实心高强钢管约束UHPC梁、1个方套方中空夹层高强钢管约束UHPC梁和3个方套圆中空夹层高强钢管约束UHPC梁进行了两点弯曲试验.研究了高强钢管约束UHPC梁在纯弯荷载下的破坏形式以及含钢率、钢材屈服强度和截面组合形式对梁抗弯承载力和抗弯刚度的影响.试验结果表明:高强钢管约束UHPC梁弯矩-曲率的变化过程分为3个阶段:弹性阶段...
关键词 ：
抗弯刚度 抗弯刚度 超高性能混凝土 超高性能混凝土 高强钢管 高强钢管 折减系数 折减系数 抗弯承载力 抗弯承载力 受弯力学性能 受弯力学性能
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| GB/T 7714 | 邓宗才 , 孙彤 , 李佳跃 . 高强钢管约束超高性能混凝土梁抗弯性能研究 [J]. | 天津大学学报(自然科学与工程技术版) , 2021 , 54 (11) : 1111-1120 . |
| MLA | 邓宗才 et al. "高强钢管约束超高性能混凝土梁抗弯性能研究" . | 天津大学学报(自然科学与工程技术版) 54 . 11 (2021) : 1111-1120 . |
| APA | 邓宗才 , 孙彤 , 李佳跃 . 高强钢管约束超高性能混凝土梁抗弯性能研究 . | 天津大学学报(自然科学与工程技术版) , 2021 , 54 (11) , 1111-1120 . |
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摘要 ：
膨胀剂、减缩剂对超高性能混凝土自收缩性能的影响
关键词 ：
膨胀剂 膨胀剂 自收缩 自收缩 单掺 单掺 减缩剂 减缩剂 超高性能混凝土 超高性能混凝土 双掺 双掺
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| GB/T 7714 | 邓宗才 , 连怡红 , 赵连志 et al. 膨胀剂、减缩剂对超高性能混凝土自收缩性能的影响 [J]. | 邓宗才 , 2021 , 47 (1) : 61-69 . |
| MLA | 邓宗才 et al. "膨胀剂、减缩剂对超高性能混凝土自收缩性能的影响" . | 邓宗才 47 . 1 (2021) : 61-69 . |
| APA | 邓宗才 , 连怡红 , 赵连志 , 北京工业大学学报 . 膨胀剂、减缩剂对超高性能混凝土自收缩性能的影响 . | 邓宗才 , 2021 , 47 (1) , 61-69 . |
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摘要 ：
提出了一种新型纤维混凝土拌和工序和评价纤维分散性的简易方法,并研究了不同掺量PVA纤维对混凝土力学性能和弯曲韧性的影响.结果表明:新型拌合工序可以有效降低对纤维的损伤,有助于纤维在混凝土中均匀分散;当纤维掺量为4.5 kg/m3和7.5 kg/m3时,纤维分散性较好,而当纤维掺量为10.5 kg/m3时,纤维分散性欠佳;随着PVA纤维掺量的增加,混凝土的抗压、抗拉强度先增后减,弯拉强度和韧性耗能能力逐渐增强.
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| GB/T 7714 | 邓宗才 , 赵连志 , 丁建明 et al. PVA纤维分散性及纤维混凝土弯曲韧性试验研究 [J]. | 混凝土与水泥制品 , 2021 , (8) : 49-53 . |
| MLA | 邓宗才 et al. "PVA纤维分散性及纤维混凝土弯曲韧性试验研究" . | 混凝土与水泥制品 8 (2021) : 49-53 . |
| APA | 邓宗才 , 赵连志 , 丁建明 , 贺少锋 . PVA纤维分散性及纤维混凝土弯曲韧性试验研究 . | 混凝土与水泥制品 , 2021 , (8) , 49-53 . |
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摘要 ：
高强箍筋约束超高性能混凝土方形短柱轴压承载力计算方法
关键词 ：
方形短柱 方形短柱 设计标准 设计标准 超高性能混凝土 超高性能混凝土 轴压承载力 轴压承载力 高强箍筋 高强箍筋
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| GB/T 7714 | 姚军锁 , 邓宗才 , 工业建筑 . 高强箍筋约束超高性能混凝土方形短柱轴压承载力计算方法 [J]. | 姚军锁 , 2021 , 51 (2) : 26-31 . |
| MLA | 姚军锁 et al. "高强箍筋约束超高性能混凝土方形短柱轴压承载力计算方法" . | 姚军锁 51 . 2 (2021) : 26-31 . |
| APA | 姚军锁 , 邓宗才 , 工业建筑 . 高强箍筋约束超高性能混凝土方形短柱轴压承载力计算方法 . | 姚军锁 , 2021 , 51 (2) , 26-31 . |
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摘要 ：
配筋UHPC柱的抗震性能及影响因素分析
关键词 ：
剪跨比 剪跨比 抗剪承载力 抗剪承载力 抗震性能 抗震性能 耗能能力 耗能能力 超高性能混凝土(UHPC) 超高性能混凝土(UHPC) 高强钢筋 高强钢筋
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| GB/T 7714 | 邓宗才 , 贺少锋 , 姚军锁 et al. 配筋UHPC柱的抗震性能及影响因素分析 [J]. | 邓宗才 , 2021 , 53 (4) : 51-61 . |
| MLA | 邓宗才 et al. "配筋UHPC柱的抗震性能及影响因素分析" . | 邓宗才 53 . 4 (2021) : 51-61 . |
| APA | 邓宗才 , 贺少锋 , 姚军锁 , 哈尔滨工业大学学报 . 配筋UHPC柱的抗震性能及影响因素分析 . | 邓宗才 , 2021 , 53 (4) , 51-61 . |
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