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Abstract ：
High pile cap foundation is an important component of the supporting structure system for offshore fixed wind power. Due to the harsh marine environmental conditions, the development of high durability foundation caps is of great significance for improving the long-term service performance of the structure. Ultra high performance concrete (UHPC) has high strength and durability characteristics, and has superior application advantages in high-performance engineering structures. This paper proposes a high performance composite bearing cap structure using ultra-high performance concrete as a membrane shell without disassembly. The mechanical behaviors and failure mechanism are analyzed by numerical simulations under the serviceability limit state (SLS) and over-design state (ODS). The results show that the high performance composite bearing cap has better mechanical and deformation properties and excellent economic benefits compared with the normal conrete bearing cap.
Keyword ：
Failure mechanism Failure mechanism High performance composite bearing cap High performance composite bearing cap Mechanical behavior Mechanical behavior Stay-in-place formwork Stay-in-place formwork
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| GB/T 7714 | Liu, Dayong , Wu, Zhongchong , Lin, Lanri et al. Behaviors Analysis of High Performance Composite Bearing Cap Made by UHPC Permanent Form for Offshore Wind Tower Foundation [J]. | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 2, ICCEA 2023 , 2024 , 531 : 85-92 . |
| MLA | Liu, Dayong et al. "Behaviors Analysis of High Performance Composite Bearing Cap Made by UHPC Permanent Form for Offshore Wind Tower Foundation" . | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 2, ICCEA 2023 531 (2024) : 85-92 . |
| APA | Liu, Dayong , Wu, Zhongchong , Lin, Lanri , Wu, Xiangguo , Zhang, Yun , Wu, Chengen et al. Behaviors Analysis of High Performance Composite Bearing Cap Made by UHPC Permanent Form for Offshore Wind Tower Foundation . | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 2, ICCEA 2023 , 2024 , 531 , 85-92 . |
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Abstract ：
The concrete cap is an important support structure for stationary offshore wind power, and its construction efficiency and long-term performance are very important for the healthy service of wind power equipment. Taking the 4.8 MW of the high-rise pile reinforced concrete cap foundation (RCCF) in China as a case study, a novel composite concrete cap is proposed by using prefabricated UHPC stay-in-place (USIP) formwork in the construction stage, forming a UHPC composite concrete cap foundation (UCCF) in this paper. The concept development of UCCF, including structure composition, structure advantages and construction methods are introduced. On this basis, the comprehensive study of mechanical behavior under the ultimate limit state is analyzed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Keyword ：
Concept development Concept development Stay-in-place formwork Stay-in-place formwork Structural behavior Structural behavior UHPC composite concrete cap UHPC composite concrete cap
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| GB/T 7714 | Wu, Z. , Liu, D. , Lin, L. et al. Innovative Design and Structural Behavior of UHPC Composite Cap Foundation Under Ultimate Limit State [未知]. |
| MLA | Wu, Z. et al. "Innovative Design and Structural Behavior of UHPC Composite Cap Foundation Under Ultimate Limit State" [未知]. |
| APA | Wu, Z. , Liu, D. , Lin, L. , Zhang, Y. , Wu, C. , Wang, H. et al. Innovative Design and Structural Behavior of UHPC Composite Cap Foundation Under Ultimate Limit State [未知]. |
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Given the extensive utilization of composite structures of ultra-high performance concrete (UHPC) and normal concrete (NC) in engineering applications, there has been a growing emphasis on studying the shear failure and mechanical properties analysis of the UHPC-NC interface. U-shaped studs assume a crucial role in reinforcing the UHPC-NC interface, so it is of great significance to analyze the shear failure of UHPC-NC interface with U-shaped studs. To directly observe the bonding failure process between studs and concrete and to determining the failure mechanism of the UHPC-NC interface with U-shaped studs, this paper establishs the three-dimensional finite element model to investigate the local damage evolution and the failure pattern of UHPC-NC incorporating U-shaped studs. The numerical analysis indicates the final failure pattern of the UHPC-NC interface with U-shaped stubs is the fracture of the U-shaped stud.
Keyword ：
composite interface composite interface damage evolution damage evolution FEM FEM U-shaped shear stud U-shaped shear stud
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| GB/T 7714 | Liu, Dayong , Wu, Zhongchong , Wu, Xiangguo et al. Local Damage Evolution Analysis of the Interface Between Prefabricated UHPC Element and Cast-In-Place Concrete [J]. | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 1, ICCEA 2023 , 2024 , 530 : 195-200 . |
| MLA | Liu, Dayong et al. "Local Damage Evolution Analysis of the Interface Between Prefabricated UHPC Element and Cast-In-Place Concrete" . | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 1, ICCEA 2023 530 (2024) : 195-200 . |
| APA | Liu, Dayong , Wu, Zhongchong , Wu, Xiangguo , Zhang, Yun , Wu, Chengen , Lin, Lanri et al. Local Damage Evolution Analysis of the Interface Between Prefabricated UHPC Element and Cast-In-Place Concrete . | PROCEEDINGS OF 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND ARCHITECTURE, VOL 1, ICCEA 2023 , 2024 , 530 , 195-200 . |
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Abstract ：
本实用新型涉及一种装配化UHPC‑RC组合转体上承台实腹式转盘，包括UHPC外模壳和RC内核心，所述的UHPC外模壳由多块尺寸相同的UHPC异形结构装配组成，所述UHPC异形结构包括UHPC竖板、UHPC底板、UHPC撑脚外壳与UHPC加劲肋，所述UHPC竖板均呈弧形且相邻间相互拼接组成转盘的竖环，所述UHPC底板均呈扇形其外端弧面与UHPC竖板固连为一体，相邻UHPC底板间同拼接组成转盘的底板，所述UHPC加劲肋固设在UHPC竖板与UHPC底板内壁交接处，UHPC撑脚外壳固设在UHPC底板底部同经拼接组成转盘的撑脚外壳，所述转盘的竖环、底板和撑脚外壳内绑扎钢筋并进行混凝土浇筑，形成UHPC‑RC组合的实腹式转盘，该实用新型结构简单，施工方便且不需要转盘的模板工程量而节省大量劳力。
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| GB/T 7714 | 苏家战 , 苏子辰 , 杨艳 et al. 一种装配化UHPC-RC组合转体上承台实腹式转盘 : CN202321580966.8[P]. | 2023-06-20 00:00:00 . |
| MLA | 苏家战 et al. "一种装配化UHPC-RC组合转体上承台实腹式转盘" : CN202321580966.8. | 2023-06-20 00:00:00 . |
| APA | 苏家战 , 苏子辰 , 杨艳 , 赵秋 . 一种装配化UHPC-RC组合转体上承台实腹式转盘 : CN202321580966.8. | 2023-06-20 00:00:00 . |
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Steel-Ultra-high performance concrete (UHPC) composite slab has many applications in long-span bridges, in which the headed stud connectors play a key role. To explore the shear resistance of headed studs in steel-UHPC composite slab, six push-out specimens of headed stud were carried out, and different calculation methods were evaluated based on the test results, including six methods to calculate the shear bearing capacity, five models to predict the shear slip, and ten methods to calculate the shear stiffness. The test results show that the headed studs in all specimens appeared to break at the junction of the weld root, and the UHPC slabs remain intact except for partial damage at the root of the studs. The shear-slip curves of headed stud were divided into three stages, i.e., the elastic stage, the elastic-plastic stage and the descending stage. The maximum slip of all specimens is less than 3.5 mm，and the limit of elastic slip can be taken as 0.1 mm. The results show that the calculated shear resistance of headed stud in UHPC was lower than the test results according to some specifications without considering the contribution of stud welds. It is recommend that the stud welds contribution coefficient can be taken as 1.1 on the basis of the results of 2 sets of tests in this research and 29 sets of other effective data. The prediction results of different shear-slip models were different from the test results. It is suggested that the inverse proportional function model should be used to achieve accurate prediction. The actual force state of stud was not considered in the calculation of shear stiffness, resulting in significant difference in the calculation results. It is recommended that the shear stiffness corresponding to the slip of 0.1 mm can be taken as the elastic shear stiffness. The relationship between the shear-slip model and the shear stiffness of headed stud was established to provide a reference for calculation without test data. © 2023 Tsinghua University. All rights reserved.
Keyword ：
failure mode failure mode headed stud headed stud shear bearing capacity shear bearing capacity shear stiffness shear stiffness slip model slip model Ultra-high performance concrete Ultra-high performance concrete weld coefficient weld coefficient
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| GB/T 7714 | Li, C. , Chen, B.-C. , Hu, W.-X. et al. CALCULATION OF SHEAR BEARING CAPACITY, SLIP AND STIFFNESS OF HEADED STUDS IN STEEL-UHPC COMPOSITE SLAB; [钢-UHPC 组合板栓钉抗剪承载力、滑移与刚度计算] [J]. | Engineering Mechanics , 2023 , 40 (6) : 110-121 . |
| MLA | Li, C. et al. "CALCULATION OF SHEAR BEARING CAPACITY, SLIP AND STIFFNESS OF HEADED STUDS IN STEEL-UHPC COMPOSITE SLAB; [钢-UHPC 组合板栓钉抗剪承载力、滑移与刚度计算]" . | Engineering Mechanics 40 . 6 (2023) : 110-121 . |
| APA | Li, C. , Chen, B.-C. , Hu, W.-X. , Su, J.-Z. . CALCULATION OF SHEAR BEARING CAPACITY, SLIP AND STIFFNESS OF HEADED STUDS IN STEEL-UHPC COMPOSITE SLAB; [钢-UHPC 组合板栓钉抗剪承载力、滑移与刚度计算] . | Engineering Mechanics , 2023 , 40 (6) , 110-121 . |
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As a high-quality building material exhibiting excellent toughness and durability, ultrahigh-performance concrete (UHPC) is increasingly being used in the construction industry and as building reinforcement. During the reinforcement of existing concrete structures with UHPC, their interface is the weakest part of a structure. Interface bonding ensures the operation of two types of materials together. However, existing studies rarely report the bonding of the UHPC-normal concrete (NC) interface. Herein, the existing test methods and interface bonding mechanisms are summarized. Subsequently, the differences among relevant design codes are investigated by comparing different theoretical formulas. Important influencing factors of the reinforcement method, namely, interface roughness, fiber type and content, interface agent type and content, moisture content, existing concrete strength, cementitious material content, curing conditions, freeze-thaw cycles, and chloride ions, are also considered. Further, the enhancement mechanism of the characteristics of the UHPC-NC interface is clearly described. Finally, the shortcomings and application prospects of the interfacial bonding properties are highlighted.
Keyword ：
influencing factors influencing factors interfacial bonding strength interfacial bonding strength normal concrete normal concrete ultrahigh-performance concrete ultrahigh-performance concrete
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| GB/T 7714 | Xu, Liying , Yao, Yong , Li, Yuxiang et al. Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (11) . |
| MLA | Xu, Liying et al. "Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete" . | APPLIED SCIENCES-BASEL 13 . 11 (2023) . |
| APA | Xu, Liying , Yao, Yong , Li, Yuxiang , Su, Jiazhan , Wu, Yingxiong . Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete . | APPLIED SCIENCES-BASEL , 2023 , 13 (11) . |
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The present study was conducted to clarify the flexural behaviors of the Composite Girders of a Prestressed Segmental Ultra-High-Performance Concrete (UHPC) Channel and a Reinforced Conventional Concrete Deck (PSUC-RCCD). The girders can be used as bridge superstructures with the advantages of structural efficiency, cost-effectiveness, and easy construction. A total of five specimens were tested. Three of them were PSUC-RCCD specimens, including two semi-segmental girders (the channel beams were composed of five segments with dry-joints) and one integral girder (the channel beams were integral ones without dry-joints). The two other specimens were P-UHPC girders composed of PSUC and UHPC deck slabs; one was semi-segmental and the other was integral. The flexural behaviors of the specimens were investigated, including the load-displacement curves, crack distribution, cracking moments, and ultimate flexural capacity. The study compared the influence of the segment number and deck material on the flexural behaviors of semi-segmental girders and introduced and validated methods for calculating the cracking moment and flexural capacity of both semi-segmental and integral sections in PSUC-RCCD and P-UHPC girders. The results show that the entire loading process of all the specimens can be classified into the elastic phase, the cracks development phase, and the failure phase. Compared to the integral girders, the number of segments has little effect on the flexural behavior of the semi-segmental girders, but it has a significant effect on the cracking moments. The cracking moments of the semi-segmental girders is only 0.58 similar to 0.60 of the integral girders. Reducing the strength of the deck slab by changing the material from UHPC to CC does not significantly affect their flexural behaviors. Based on the test results, this work proposes a method for predicting the cracking moment and flexural capacity of the semi-segmental girders, the results of which fit well with the test results, and it is applicable in the structural design of such members.
Keyword ：
calculations calculations composite girder composite girder conventional concrete (CC) conventional concrete (CC) flexural test flexural test segmental channel segmental channel UHPC UHPC
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| GB/T 7714 | Chen, Yicong , Zhou, Jialiang , Chen, Baochun et al. Flexural Behavior of the Composite Girder of a Prestressed Segmental UHPC Channel and a Reinforced Conventional Concrete Deck [J]. | BUILDINGS , 2023 , 13 (12) . |
| MLA | Chen, Yicong et al. "Flexural Behavior of the Composite Girder of a Prestressed Segmental UHPC Channel and a Reinforced Conventional Concrete Deck" . | BUILDINGS 13 . 12 (2023) . |
| APA | Chen, Yicong , Zhou, Jialiang , Chen, Baochun , Su, Jiazhan , Nuti, Camillo . Flexural Behavior of the Composite Girder of a Prestressed Segmental UHPC Channel and a Reinforced Conventional Concrete Deck . | BUILDINGS , 2023 , 13 (12) . |
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Abstract ：
本实用新型涉及一种钢管约束UHPC柱轴压承载力试验装置，包括UHPC柱、设于UHPC柱两端的加载钢板，所述UHPC柱从上往下依次分为上端加载段、中间试验段以及下端加载段，所述中间试验段的外侧套设有外包钢管，所述上端加载段和下端加载段的外侧均套设有套环，所述套环的内部具有沿竖向压缩变形的变形件，套环的两端面分别与加载钢板和外包钢管的端面相接触。本实用新型结构设计简单、合理，可避免加载端部的UHPC柱过早发生局部破坏的问题，同时试验时竖向轴压荷载不会作用于中间试验段的外包钢管，从而不影响中间试验段的钢管仅对核心UHPC起约束作用的受力状态，施工方便，可应用于钢管约束UHPC柱的轴压承载力试验研究。
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| GB/T 7714 | 苏家战 , 祝汇丰 , 陈宝春 . 一种钢管约束UHPC柱轴压承载力试验装置 : CN202221273058.X[P]. | 2022-05-26 00:00:00 . |
| MLA | 苏家战 et al. "一种钢管约束UHPC柱轴压承载力试验装置" : CN202221273058.X. | 2022-05-26 00:00:00 . |
| APA | 苏家战 , 祝汇丰 , 陈宝春 . 一种钢管约束UHPC柱轴压承载力试验装置 : CN202221273058.X. | 2022-05-26 00:00:00 . |
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本实用新型涉及一种三分底板‑三分竖环组合混凝土承台基础，包括由上至下依次设置的预制UHPC三分竖环、预制UHPC三分底板和钢支撑平台，所述预制UHPC三分竖环上方设有组合承台后浇混凝土结构，组合承台后浇混凝土结构、预制UHPC三分竖环、预制UHPC三分底板之间形成后浇区间。本实用新型结构简单，设计合理，提高承台耐久性，减轻复杂海况和气候对施工作业的影响，提高施工安全性，减小施工难度，提高施工效率，实现工业化设计、生产、装配建造，提高承台综合经济效益。
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| GB/T 7714 | 吴香国 , 林揽日 , 王霄 et al. 三分底板-三分竖环组合混凝土承台基础 : CN202320276428.3[P]. | 2023-02-22 00:00:00 . |
| MLA | 吴香国 et al. "三分底板-三分竖环组合混凝土承台基础" : CN202320276428.3. | 2023-02-22 00:00:00 . |
| APA | 吴香国 , 林揽日 , 王霄 , 张学森 , 吴成恩 , 钟开豪 et al. 三分底板-三分竖环组合混凝土承台基础 : CN202320276428.3. | 2023-02-22 00:00:00 . |
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钢-Ultra-high performance concrete (UHPC)组合桥面板在大跨桥梁中具有较多应用，栓钉连接件对其组合作用的发挥起关键作用。为探究钢-UHPC组合板中栓钉抗剪性能，开展了6个栓钉抗剪推出试验，收集了6种抗剪承载力计算方法、5种抗剪滑移预测模型和10种抗剪刚度计算方法，根据试验结果分别进行计算分析。试验结果表明：所有试件中的栓钉均表现为焊缝与根部交界处剪断，UHPC板除在栓钉根部位置出现局部破损外，基本保持完好；栓钉的抗剪滑移曲线经历弹性、弹塑性和下降3个阶段；所有试件最大滑移量均小于3.5 mm，可取0.1 mm作为弹性极限滑移量。计算结果表明：现有部分规范计算UHPC中栓钉抗剪承载力时不考虑焊缝影响，计算结果偏低，根据该文2组试验数据和收集29组有效数据，提出考虑焊缝影响的计算式，建议UHPC中栓钉焊缝贡献系数取1.1；不同抗剪滑移模型预测结果差异大，建议采用反比例函数形式的模型预测，较为精确；栓钉的抗剪刚度取值由于未考虑栓钉实际处于受力状态，计算结果差异大，建议取滑移量0.1 mm对应的刚度作为弹性抗剪刚度；建立了栓钉抗剪滑移模型与抗剪刚度的关系式，在缺少试验数据时可为近似计算提供参考。
Keyword ：
Ultra-high performance concrete Ultra-high performance concrete 抗剪刚度 抗剪刚度 抗剪承载力 抗剪承载力 栓钉 栓钉 滑移模型 滑移模型 焊缝系数 焊缝系数 破坏模式 破坏模式
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| GB/T 7714 | 李聪 , 陈宝春 , 胡文旭 et al. 钢-UHPC组合板栓钉抗剪承载力、滑移与刚度计算 [J]. | 工程力学 , 2023 , 40 (6) : 110-121 . |
| MLA | 李聪 et al. "钢-UHPC组合板栓钉抗剪承载力、滑移与刚度计算" . | 工程力学 40 . 6 (2023) : 110-121 . |
| APA | 李聪 , 陈宝春 , 胡文旭 , 苏家战 . 钢-UHPC组合板栓钉抗剪承载力、滑移与刚度计算 . | 工程力学 , 2023 , 40 (6) , 110-121 . |
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