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学者姓名：白玉磊
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摘要 ：
Fiber-reinforced polymer (FRP) confinement has been demonstrated to be efficient in enhancing the deformation and strength capacities of concrete, while Polyethylene terephthalate (PET) FRP-confined concrete easily exhibits a strain-softening stress-strain behavior, especially for PET FRP-confined concrete in square columns. In this study, novel PET FRP-confined FRP spiral reinforced concrete square columns (FCFRSCs) are proposed. Capitalizing the benefits of internal FRP spiral reinforcement, the strain-softening behavior of PET FRP-confined concrete is expected to be alleviated, leading to excellent mechanical performance of the proposed square columns. The axial compressive behavior of FCFRSCs, as well as square concrete-filled PET FRP tube columns (CFFTs) and FRP reinforced concrete columns (FRCs) as reference columns, were investigated via experimentation. The experimental results show that the strain softening behavior of confined concrete in FCFRSCs has been substantially enhanced with the internal FRP reinforcement, confirming the viability of the system. The strain softening behavior of FRP-confined concrete after the first peak is prevented and a hardening behavior is achieved for concrete in FCFRSCs, especially when the GFRP spiral pitch is 30 mm.
关键词 ：
Glass FRP (GFRP) Glass FRP (GFRP) Reinforced concrete columns Reinforced concrete columns Confinement Confinement FRP spiral FRP spiral Axial load-strain behavior Axial load-strain behavior Fiber-reinforced polymer (FRP) bars Fiber-reinforced polymer (FRP) bars
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| GB/T 7714 | Zhou, Jie-Kai , Lin, Wen-Kai , Guo, Shao-Xiong et al. Behavior of FRP-confined FRP spiral reinforced concrete square columns (FCFRCs) under axial compression [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
| MLA | Zhou, Jie-Kai et al. "Behavior of FRP-confined FRP spiral reinforced concrete square columns (FCFRCs) under axial compression" . | JOURNAL OF BUILDING ENGINEERING 45 (2022) . |
| APA | Zhou, Jie-Kai , Lin, Wen-Kai , Guo, Shao-Xiong , Zeng, Jun-Jie , Bai, Yu-Lei . Behavior of FRP-confined FRP spiral reinforced concrete square columns (FCFRCs) under axial compression . | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
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摘要 ：
本发明公开了一种外包FRP对纵筋侧向支撑刚度的计算方法，根据柱截面纵筋的数量和截面的对称性进行等截面划分，确定曲线梁模型；采用分析导向应力应变模型，获得轴向应变、轴向应力、侧向应变和侧向应力及其增量形式；确定FRP约束混凝土在轴向的剪切模量以及FRP约束混凝土保护层在环向的弹性模量；将该组合截面梁等效为单一材料截面，并求出其截面特性；利用结构力学求解超静定结构的方法，求解在任一给定的荷载作用下，在该作用点发生的位移；求出等效刚度。本发明具有高准确性、可更新可修改等优点，且运用了成熟的结构力学求解超静定结构的计算方法，计算简单，准确性高，具有很强的研究应用价值。
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| GB/T 7714 | 白玉磊 , 孙鹏轩 , 贾俊峰 et al. 一种外包FRP对纵筋侧向支撑刚度的计算方法 : CN202110024647.8[P]. | 2021-01-08 . |
| MLA | 白玉磊 et al. "一种外包FRP对纵筋侧向支撑刚度的计算方法" : CN202110024647.8. | 2021-01-08 . |
| APA | 白玉磊 , 孙鹏轩 , 贾俊峰 , 张玉峰 , 杨洪龙 . 一种外包FRP对纵筋侧向支撑刚度的计算方法 : CN202110024647.8. | 2021-01-08 . |
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摘要 ：
预应力连接预制节段桥墩已较为广泛地应用于美国低震区桥梁,但在我国的工程应用甚少。由于预制节段桥墩的震害资料缺乏,且其抗震机理不明确、设计方法不完善,在高震区应用较少。本文基于预应力连接预制节段桥墩缩尺模型的拟静力试验测试,采用有限元分析软件ABAQUS建立其精细化数值模型,进行了单、斜向往复荷载作用下墩柱拟静力试验数值仿真,将桥墩的损伤情况、滞回行为与试验结果进行了对比分析。结果表明,数值模型输入的相关参数和设置的相互作用关系可较好地再现试验结果,试验和模拟结果均表明斜向加载的构件较单向加载的构件损伤更为严重,构件更早屈服,残余位移较大,墩柱构件最大偏移率为4%时其残余偏移率已超过1%。常规设...
关键词 ：
单、斜向往复荷载 单、斜向往复荷载 抗震性能 抗震性能 有限元分析模型 有限元分析模型 节段拼装桥墩 节段拼装桥墩 预应力筋 预应力筋
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| GB/T 7714 | 张凯迪 , 贾俊峰 , 白玉磊 et al. 预应力连接预制节段桥墩拟静力试验数值仿真分析 [C] //第30届全国结构工程学术会议论文集（Ⅱ册） . 2021 . |
| MLA | 张凯迪 et al. "预应力连接预制节段桥墩拟静力试验数值仿真分析" 第30届全国结构工程学术会议论文集（Ⅱ册） . (2021) . |
| APA | 张凯迪 , 贾俊峰 , 白玉磊 , 郭扬 . 预应力连接预制节段桥墩拟静力试验数值仿真分析 第30届全国结构工程学术会议论文集（Ⅱ册） . (2021) . |
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摘要 ：
This paper presents an experimental study on the dynamic compressive behaviors of concrete confined with unidirectional natural flax fiber reinforced polymers (FFRPs) under an axial impact load. A total of 80 specimens were prepared and tested using a 75 mm diameter split Hopkinson pressure bar (SHPB) at different strain rates varying from 50 to 200 s−1. The experimental results showed that the failure modes and dynamic compressive mechanical properties (i.e., dynamic compressive strength, critical compressive strain, and energy absorption capacity) of FFRP-confined concrete were sensitive to the strain rate. The unconfined concrete specimens were crushed into small pieces at relatively low strain rates, whereas the FFRP-confined concrete specimens failed with FRP rupture and partial damage to the core concrete at relatively high strain rates. This indicates that the confinement of FFRP jackets can alleviate concrete damage and improve impact resistance. Compared with unconfined concrete, the application of the FFRP jacket remarkably improves the compressive strength, critical strain, and toughness, which indicates outstanding impact resistance. Increasing the confinement stiffness of the FFRP contributed to increasing the compressive strength, critical strain, and toughness. Based on the experimental results, the confinement mechanism of external flax FRP jackets on concrete was discussed, and a new dynamic strength model was proposed to predict the dynamic compressive strength of FFRP-confined concrete within the investigated strain rate range. © 2020
关键词 ：
Compressive strength Compressive strength Concrete testing Concrete testing Dynamics Dynamics Fiber reinforced concrete Fiber reinforced concrete Fiber reinforced plastics Fiber reinforced plastics Flax Flax Linen Linen Mechanical testing Mechanical testing Natural polymers Natural polymers Strain rate Strain rate
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| GB/T 7714 | Bai, Yu-lei , Yan, Zhi-Wei , Jia, Jun-Feng et al. Dynamic compressive behavior of concrete confined with unidirectional natural flax FRP based on SHPB tests [J]. | Composite Structures , 2021 , 259 . |
| MLA | Bai, Yu-lei et al. "Dynamic compressive behavior of concrete confined with unidirectional natural flax FRP based on SHPB tests" . | Composite Structures 259 (2021) . |
| APA | Bai, Yu-lei , Yan, Zhi-Wei , Jia, Jun-Feng , Ozbakkaloglu, Togay , Liu, Yue . Dynamic compressive behavior of concrete confined with unidirectional natural flax FRP based on SHPB tests . | Composite Structures , 2021 , 259 . |
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摘要 ：
In this study, carbon nanofibers (CNFs)/epoxy composites incorporating different contents of CNFs were fabricated and immersed in distilled water for 180 days. Water absorption test, tensile tests, scanning electron microscopy (SEM) observation, dynamic mechanical analysis (DMA), and Fourier transform infrared (FTIR) spectroscopy were performed to evaluate the effect of CNFs content on hygrothermal aging behavior of CNFs/epoxy composites, and to reveal the hygrothermal aging mechanism of such composites. Test results showed that the addition of CNFs into pure epoxy resin could obviously improve its hygrothermal aging behavior. The CNFs/epoxy composites had better resistance to water absorption than pure epoxy because CNFs improved the water barrier properties of the composites. The improvements of glass transition temperature and the storage modulus of the composites before and after aging were attributed to the fact that the addition of CNFs limited the loosening of molecular chains and increased the second cross-link density of epoxy resin. FTIR spectroscopy showed that the number of -OH functional groups of CNFs/epoxy composites was decreased, which revealed that CNFs inhibited the hydrolysis of epoxy resin and water absorption. This study demonstrates that adding appropriate amount of CNFs into epoxy resin has potential to improve the long-term durability of epoxy-based composites in hygrothermal environment. (c) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Carbon nanofibers (CNFs) Carbon nanofibers (CNFs) Epoxy Epoxy Hygrothermal aging Hygrothermal aging Nanocomposites Nanocomposites Durability Durability Aging mechanism Aging mechanism
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| GB/T 7714 | Wang, Yanlei , Meng, Ziping , Zhu, Wanxin et al. Hygrothermal aging behavior and aging mechanism of carbon nanofibers/epoxy composites [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 294 . |
| MLA | Wang, Yanlei et al. "Hygrothermal aging behavior and aging mechanism of carbon nanofibers/epoxy composites" . | CONSTRUCTION AND BUILDING MATERIALS 294 (2021) . |
| APA | Wang, Yanlei , Meng, Ziping , Zhu, Wanxin , Wan, Baolin , Han, Baoguo , Cai, Gaochuang et al. Hygrothermal aging behavior and aging mechanism of carbon nanofibers/epoxy composites . | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 294 . |
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摘要 ：
This paper presents the results of an experimental study aimed at investigating the effects of strain rate and temperature on the tensile mechanical properties of polyethylene naphthalene (PEN) fiber bundles by using a drop-weight impact system. A total of 65 specimens with a gauge length of 25 mm were prepared and tested. The test variables included five different strain rates (1/600, 40, 80, 120 and 160 s(1)) and five different temperatures (-50, -25, 0, 25 and 50 degrees C). The results indicated that the tensile strengths and elastic moduli of the specimens increased with the strain rate, whereas the failure strain decreased and the toughness remained almost unchanged with the increase of the strain rate. The tensile strength, toughness and failure strain initially improved and then reduced with an increasing temperature from - 50 degrees C to 50 degrees C. A Weibull distribution model was implemented to describe the degree of variability in the tensile strength of PEN fiber bundles for future use. (C) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Polyethylene naphthalene (PEN) fiber Polyethylene naphthalene (PEN) fiber Strain rate Strain rate Temperature effect Temperature effect Tensile mechanical properties Tensile mechanical properties Weibull analysis Weibull analysis
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| GB/T 7714 | Bai, Yu-Lei , Yan, Zhi-Wei , Ozbakkaloglu, Togay et al. Mechanical behavior of large-rupture-strain (LRS) polyethylene naphthalene fiber bundles at different strain rates and temperatures [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 297 . |
| MLA | Bai, Yu-Lei et al. "Mechanical behavior of large-rupture-strain (LRS) polyethylene naphthalene fiber bundles at different strain rates and temperatures" . | CONSTRUCTION AND BUILDING MATERIALS 297 (2021) . |
| APA | Bai, Yu-Lei , Yan, Zhi-Wei , Ozbakkaloglu, Togay , Gao, Wan-Yang , Zeng, Jun-Jie . Mechanical behavior of large-rupture-strain (LRS) polyethylene naphthalene fiber bundles at different strain rates and temperatures . | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 297 . |
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摘要 ：
Fiber-reinforced polymer (FRP)-concrete-steel hybrid multi-tube concrete column (MTCC) is a new type of composite column and comprises a number of steel inner tubes, an FRP external tube and concrete fillings for the space inside all the tubes. This paper presents a series of experimental tests on four large-size square PEN (polyethylene naphthalate) FRP-MTCCs, of which the PEN fibers were extracted from recycled plastic bottles. The parameters of interest include the FRP thickness and the steel tube configuration. The experimental results showed that the large-size square MTCCs with PEN FRP exhibited excellent ductility due to the effective confinement provided by PEN FRP jacket and steel tubes. A prediction method for the square PEN FRP-MTCCs has been developed in the present study to consider the unique characteristics of the column and is able to produce reasonable predictions for the experimental results. This study serves to present an innovative alternative in an environmentally friendly way that can replace the conventional bridge piers in coastal and salina regions.
关键词 ：
Confined concrete Confined concrete Hybrid columns Hybrid columns Large rupture strain (LRS) FRP Large rupture strain (LRS) FRP Large-size columns Large-size columns Polyethylene naphthalene (PEN) Polyethylene naphthalene (PEN)
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| GB/T 7714 | Bai, Yu-Lei , Mei, Shi-Jie , Chan, Chun-Wa et al. Compressive behavior of large-size square PEN FRP-concrete-steel hybrid multi-tube concrete columns [J]. | ENGINEERING STRUCTURES , 2021 , 246 . |
| MLA | Bai, Yu-Lei et al. "Compressive behavior of large-size square PEN FRP-concrete-steel hybrid multi-tube concrete columns" . | ENGINEERING STRUCTURES 246 (2021) . |
| APA | Bai, Yu-Lei , Mei, Shi-Jie , Chan, Chun-Wa , Li, Qian-Qian . Compressive behavior of large-size square PEN FRP-concrete-steel hybrid multi-tube concrete columns . | ENGINEERING STRUCTURES , 2021 , 246 . |
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摘要 ：
Precast reinforced concrete (RC) bridge columns are critical substructure components for Accelerated Bridge Construction (ABC), which attracts significant attention all over the world in recent decades. However, seismic behavior of precast RC bridge columns in corrosive environment and related retrofit methods are rarely studied. To fill out this knowledge gap, in this study, four, 1/4-scaled precast RC bridge columns of various corrosion levels were designed, constructed and tested in a pseudo-static manner to gain in-depth understanding of corrosion on the seismic behavior of this type of columns. Two of these columns with higher corrosion levels were retrofitted with carbon fiber reinforced polymer (CFRP) fabrics in the plastic hinge zone to assess the effectiveness of this retrofit measure. Corrosion levels of the specimens were obtained through an electrochemical method to accelerate the corrosion process at the plastic region. It was found that corrosion in the reinforcement was uneven across the section and was much severer at the joint of precast bridge columns. It was also found that even the low corrosion level of longitudinal reinforcement (i.e. 7.2%) can result in a significant decrease (i.e. >15%) in the lateral load capacity, energy dissipation, ductility and ultimate displacement. Hence, the retrofit of corroded precast RC bridge columns should be performed at low-level of corrosion. The test results also indicate that corrosion has more adverse effect on the ultimate displacement and ductility than the strength. In addition, retrofitting bridge columns of higher corrosion levels (i.e., >10%) using CFRP jackets could effectively protect the columns from damage in the plastic hinge zones. However, the damage pattern was shifted to fracture of the longitudinal rebars at the column-footing interface, resulting in substantial reduction in the ultimate displacement capacity. Therefore, it is not recommended to retrofit precast RC bridge columns of high corrosion level using CFRP jackets alone.
关键词 ：
Precast RC bridge columns Precast RC bridge columns CFRP CFRP Corrosion Corrosion Quasi-static test Quasi-static test Seismic performance Seismic performance
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| GB/T 7714 | Wang, Xu , Wu, Suiwen , Jia, Junfeng et al. Experimental evaluation of seismic performance of corroded precast RC bridge columns and the retrofit measure using CFRP jackets [J]. | ENGINEERING STRUCTURES , 2021 , 245 . |
| MLA | Wang, Xu et al. "Experimental evaluation of seismic performance of corroded precast RC bridge columns and the retrofit measure using CFRP jackets" . | ENGINEERING STRUCTURES 245 (2021) . |
| APA | Wang, Xu , Wu, Suiwen , Jia, Junfeng , Li, Huaqiang , Wei, Yanjian , Zhang, Kaidi et al. Experimental evaluation of seismic performance of corroded precast RC bridge columns and the retrofit measure using CFRP jackets . | ENGINEERING STRUCTURES , 2021 , 245 . |
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摘要 ：
To establish an anti-seismic reinforcement method (ASRM) for fabricated concrete piers based on carbon fibre reinforced polymer (CFRP) and polyethylene terephthalate (PET) materials, two 1/6-scale prefabricated piers with grouted sleeve connections (SFPs) and grouted sleeve prestressing tendon composite connections (SSFPs) were designed and manufactured. Shaking table tests were carried out for the model piers. Then, an ASRM using CFRP/PET with anti-sway external metallic dissipaters (AS-EMD) was proposed. The design and implementation methods of the CFRP-AS-EMD and PET-AS-EMD were established. Under the same excitation, shaking table tests of the SFPs repaired with the CFRP-AS-EMD and the SSFPs repaired with PET-AS-EMD were conducted. And finite element analysis (FEA) verification of the reinforcement effect was also carried out. The results showed that the initial seismic damage of the SFPs and SSFPs included pier body cracking, concrete spalling or crushing, and seam cracking at the bottom of the pier. The CFRP-AS-EMD and PET-AS-EMD can evidently decrease the horizontal displacement of the specimens, demonstrate good anti-sway capacity, provide a certain energy consumption capacity, and effectively improve the ductility of the reinforced pier specimens.
关键词 ：
Near-fault ground motion Near-fault ground motion Reinforcement Reinforcement PET PET CFRP CFRP Prefabricated bridge pier Prefabricated bridge pier Shaking table test Shaking table test
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| GB/T 7714 | Wang, Shaojian , Xu, Weibing , Wang, Jin et al. Experimental research on anti-seismic reinforcement of fabricated concrete pier connected by grouting sleeve based on CFRP and PET materials [J]. | ENGINEERING STRUCTURES , 2021 , 245 . |
| MLA | Wang, Shaojian et al. "Experimental research on anti-seismic reinforcement of fabricated concrete pier connected by grouting sleeve based on CFRP and PET materials" . | ENGINEERING STRUCTURES 245 (2021) . |
| APA | Wang, Shaojian , Xu, Weibing , Wang, Jin , Xin, Guangtao , Chen, Yanjiang , Zhao, Zhuo et al. Experimental research on anti-seismic reinforcement of fabricated concrete pier connected by grouting sleeve based on CFRP and PET materials . | ENGINEERING STRUCTURES , 2021 , 245 . |
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摘要 ：
A combination of core engineered cementitious composite (ECC) and external fiber-reinforced polymer (FRP) composites can solve the problems of insufficient ductility and durability of normal concrete (NC) in adverse environments and improve bearing capacity. However, existing studies on the performance of ECC strengthened by FRP are very limited-particularly the research on large rupture strain (LRS) FRP-confined ECC. In this study, an experimental investigation of LRS FRP and conventional glass FRP-confined ECC cylinders with different confinement levels under axial compression is presented. It is found that the application of external FRP jackets leads to a significant improvement in the compressive strength and deformation of the core ECC. LRS FRP-confined ECC exhibits a higher ultimate deformation than conventional FRP-confined ECC. The dilation behavior, axial stress-strain behavior, and energy dissipation capacity between FRP-confined ECC and FRPconfined NC under the same confinement level are compared, and the former exhibits a significantly larger ductility and energy dissipation capacity than the latter. The results also indicate that most existing models are unable to accurately predict the compressive behavior of FRP-confined ECC. To address this, a dilation model and an axial stress-strain model of FRP-confined NC are modified to extend their application to FRPconfined ECC.
关键词 ：
Confinement Confinement Fiber-reinforced polymer (FRP) Fiber-reinforced polymer (FRP) Compressive behavior Compressive behavior Engineered cementitious composite (ECC) Engineered cementitious composite (ECC) Large rupture strain (LRS) Large rupture strain (LRS)
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| GB/T 7714 | Yuan, Wan-Ying , Han, Qiang , Bai, Yu-Lei et al. Compressive behavior and modelling of engineered cementitious composite (ECC) confined with LRS FRP and conventional FRP [J]. | COMPOSITE STRUCTURES , 2021 , 272 . |
| MLA | Yuan, Wan-Ying et al. "Compressive behavior and modelling of engineered cementitious composite (ECC) confined with LRS FRP and conventional FRP" . | COMPOSITE STRUCTURES 272 (2021) . |
| APA | Yuan, Wan-Ying , Han, Qiang , Bai, Yu-Lei , Du, Xiu-Li , Yan, Zhi-Wei . Compressive behavior and modelling of engineered cementitious composite (ECC) confined with LRS FRP and conventional FRP . | COMPOSITE STRUCTURES , 2021 , 272 . |
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