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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 ：
Axial load-strain behavior Axial load-strain behavior Confinement Confinement Fiber-reinforced polymer (FRP) bars Fiber-reinforced polymer (FRP) bars FRP spiral FRP spiral Glass FRP (GFRP) Glass FRP (GFRP) Reinforced concrete columns Reinforced concrete columns
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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 ：
为控制地震作用下结构的残余变形,提出了一种自复位U形钢板耗能支撑,采用组合碟簧作为复位系统提供复位能力,将U形钢板作为耗能系统提供耗能能力.在耗能系统和复位系统的双线性弹性模型基础上,建立了支撑恢复力模型,并对支撑进行数值模拟,分析不同设计参数对支撑滞回性能的影响.结果 表明,自复位U形钢板耗能支撑具有稳定的耗能能力和良好的自复位能力,且耗能能力随U形钢板宽度的增加而增强,复位能力随组合碟簧初始预压力的增大而增强,建议将组合碟簧的预压力取值为大于耗能系统的屈服强度且小于耗能系统的极限强度.
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| GB/T 7714 | 贾俊峰 , 赵凌云 , 白玉磊 et al. 自复位U形钢板耗能支撑设计与滞回性能分析 [J]. | 东南大学学报（自然科学版） , 2021 , 51 (5) : 754-761 . |
| MLA | 贾俊峰 et al. "自复位U形钢板耗能支撑设计与滞回性能分析" . | 东南大学学报（自然科学版） 51 . 5 (2021) : 754-761 . |
| APA | 贾俊峰 , 赵凌云 , 白玉磊 , 周述美 , 刘钊 , 李茂昌 . 自复位U形钢板耗能支撑设计与滞回性能分析 . | 东南大学学报（自然科学版） , 2021 , 51 (5) , 754-761 . |
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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 ：
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 ：
Aging mechanism Aging mechanism Carbon nanofibers (CNFs) Carbon nanofibers (CNFs) Durability Durability Epoxy Epoxy Hygrothermal aging Hygrothermal aging Nanocomposites Nanocomposites
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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 ：
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 ：
CFRP CFRP Corrosion Corrosion Precast RC bridge columns Precast RC bridge columns 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 ：
The polyethylene naphthalene (PEN) and polyethylene terephthalate (PET) fibers have a tensile rupture strain of over 5%, and hence they are referred to as large-rupture-strain (LRS) fiber reinforced polymer (FRP) materials. Their large rupture strain characteristics may contribute to significant improvement of the impact resistance of reinforced concrete (RC) structures. This study investigates the strain rate effect on LRS FRP-confined concrete through Split Hopkinson Pressure Bar (SHPB) test. Results revealed that LRS FRP-confined concrete specimens exhibited superior impact resistance behaviors compared to the counterpart confined with CFRP composites when subjected to a single impact. The critical strain, compressive strength and toughness of the LRS FRP-confined concrete specimen increased with increasing strain rate. Due to the large rupture strain characteristics, the LRS FRP-confined concrete specimen virtually had no visible damage after a single impact. To study the damage evolution mechanism of concrete, the specimens were impacted for multiple times with the same energy until the failure of the specimen. Due to progressive concrete damage, the dynamic compressive strength and toughness experienced a decrease during multiple impacts. These findings might promote the application of LRS FRP materials in the field of impact resistance design of RC structures as a promising external jacketing material.
关键词 ：
LRS FRP-confined concrete LRS FRP-confined concrete Repeated impact Repeated impact SHPB SHPB Strain rate effect Strain rate effect
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| GB/T 7714 | Yan, Zhi-Wei , Bai, Yu-Lei , Ozbakkaloglu, Togay et al. Rate-dependent compressive behavior of concrete confined with Large-Rupture-Strain (LRS) FRP [J]. | COMPOSITE STRUCTURES , 2021 , 272 . |
| MLA | Yan, Zhi-Wei et al. "Rate-dependent compressive behavior of concrete confined with Large-Rupture-Strain (LRS) FRP" . | COMPOSITE STRUCTURES 272 (2021) . |
| APA | Yan, Zhi-Wei , Bai, Yu-Lei , Ozbakkaloglu, Togay , Gao, Wan-Yang , Zeng, Jun-Jie . Rate-dependent compressive behavior of concrete confined with Large-Rupture-Strain (LRS) FRP . | COMPOSITE STRUCTURES , 2021 , 272 . |
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摘要 ：
The combined use of a fiber-reinforced polymer (FRP) tube with steel and concrete to form hybrid structural members has attracted increasing research attention. Hybrid FRP-concrete-steel multitube concrete columns (MTCCs) are a new form of such members, comprising an external FRP tube and a number of internal steel tubes, with all the space inside the tubes filled with concrete. Hybrid MTCCs allow the use of small-scale standard steel tube products to construct large-scale columns, and these possess many advantages including excellent ductility, as demonstrated by recent studies. The existing studies on MTCCs, however, have been limited to the testing of small-scale specimens. For a new column form particularly suitable for large-scale construction, the potential size effect on the behavior of MTCCs needs to be clarified. This paper presents the first-ever experimental study on large-scale MTCCs through the testing of specimens with an outer diameter (for circular specimens) or a side length (for square specimens) of 500 mm and a height of 1,500 mm. The configuration of steel tubes in these specimens, designed to be similar to real columns, is different from those in the small-scale MTCCs reported by the existing studies. The test results show that the large-scale MTCCs all possess excellent structural performance including ample ductility and that the size effect appears to be negligible for MTCCs with sufficient confinement. The test results also show that the configuration of steel tubes may have a significant effect on the behavior of the confined concrete in MTCCs. In addition, an analytical method based on the transformed section approach and an existing model for FRP-confined concrete-filled steel tubes is presented and shown to provide close predictions of the test results in the present study.
关键词 ：
Concrete Concrete Confinement Confinement Fiber-reinforced polymer (FRP) Fiber-reinforced polymer (FRP) Hybrid columns Hybrid columns Large-scale columns Large-scale columns Steel Steel Tubular columns Tubular columns
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| GB/T 7714 | Chan, C. W. , Yu, T. , Bai, Y. L. . Behavior of Large-Scale Hybrid FRP-Concrete-Steel Multitube Concrete Columns under Axial Compression [J]. | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2021 , 25 (1) . |
| MLA | Chan, C. W. et al. "Behavior of Large-Scale Hybrid FRP-Concrete-Steel Multitube Concrete Columns under Axial Compression" . | JOURNAL OF COMPOSITES FOR CONSTRUCTION 25 . 1 (2021) . |
| APA | Chan, C. W. , Yu, T. , Bai, Y. L. . Behavior of Large-Scale Hybrid FRP-Concrete-Steel Multitube Concrete Columns under Axial Compression . | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2021 , 25 (1) . |
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摘要 ：
Axial compressive behavior of rectangular concrete might differ greatly when it is confined by fiber reinforced polymer (FRP) with different rupture strains. To address this issue, this study experimentally investigated and compared the monotonic axial compressive behavior of rectangular concrete confined by FRP with three rupture strains. Axial compression experiments of 28 rectangular concrete stub columns confined by FRP were carried out. The FRP utilized in this study included conventional FRP with small rupture strain, i.e., carbon FRP (CFRP) and glass FRP (GFRP), and large rupture strain FRP (LRS-FRP), i.e., polyethylene terephthalate (PET) FRP. The key test parameters were the rupture strain of FRP, the FRP thickness, and the cross-sectional aspect ratio. Failure modes, stress vs. strain behavior, axial stress and strain relationship, hoop rupture strain, the effect of FRP confinement stiffness ratio, and the effect of cross-sectional aspect ratio were analyzed, respectively. Results of this research showed that the rupture strain of FRP exhibited significant influence on the failure mode and the axial deformation of rectangular concrete confined by FRP. FRP strain reduction factors were decreased with the increasing rupture strains of FRP. This is because the rectangular concrete confined by FRP with larger rupture strains dilated more non-uniformly than its counterpart using smaller rupture strain FRP. In addition, based on the transition point and the ultimate condition, the axial stress vs. strain curves of rectangular concrete confined by FRP could be categorized into three types, including sufficient, moderate, and insufficient FRP confinement, respectively.
关键词 ：
Axial compressive behavior Axial compressive behavior Fiber reinforced polymer (FRP) Fiber reinforced polymer (FRP) Rectangular confined concrete Rectangular confined concrete Rupture strain Rupture strain
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| GB/T 7714 | Wang, Yanlei , Liu, Pu , Cao, Qi et al. Comparison of monotonic axial compressive behavior of rectangular concrete confined by FRP with different rupture strains [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 299 . |
| MLA | Wang, Yanlei et al. "Comparison of monotonic axial compressive behavior of rectangular concrete confined by FRP with different rupture strains" . | CONSTRUCTION AND BUILDING MATERIALS 299 (2021) . |
| APA | Wang, Yanlei , Liu, Pu , Cao, Qi , Chen, Guipeng , Wan, Baolin , Wei, Zitao et al. Comparison of monotonic axial compressive behavior of rectangular concrete confined by FRP with different rupture strains . | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 299 . |
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摘要 ：
Large-rupture strain (usually larger than 5%) fiber-reinforced polymer (LRS FRP) composites are attractive materials for the seismic retrofit of concrete structures. Jacketing LRS FRP on concrete columns can effectively improve the ultimate strength and deformation of a concrete structure and make the concrete structure have excellent ductility and superior energy absorption capacity. In comparison with conventional FRP, the concrete under LRS FRP confinement experiences a more severe damage process when it is under large deformation. The confining pressure at the large deformation can alter the concrete plastic flow and significantly affect the cyclic stress-strain path of LRS-FRP confined concrete. This study evaluates the performance of existing cyclic models (e.g., unloading path, reloading path, and plastic strain) using a database including both traditional and LRS FRP-confined concrete. Through an analytical study on the cyclic response of LRS FRP-confined concrete, two key parameters (plastic strain and stress degradation) were found to significantly influence the cyclic behavior of LRS FRP-confined concrete. By defining these two critical parameters, a new cyclic stress-strain model was developed for LRS FRP confined-concrete with good performance. The proposed cyclic model was also applicable in predicting both post-peak strain hardening and softening behavior when used in a stiffness-based envelope model. © 2021 Elsevier Ltd
关键词 ：
Concrete buildings Concrete buildings Concrete construction Concrete construction Fiber reinforced plastics Fiber reinforced plastics Plastic deformation Plastic deformation Reinforced concrete Reinforced concrete Reinforcement Reinforcement Stiffness Stiffness Strain hardening Strain hardening Stress-strain curves Stress-strain curves Unloading Unloading
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| GB/T 7714 | Bai, Yu-Lei , Mei, Shi-Jie , Li, Pengda et al. Cyclic stress-strain model for large-rupture strain fiber-reinforced polymer (LRS FRP)-confined concrete [J]. | Journal of Building Engineering , 2021 , 42 . |
| MLA | Bai, Yu-Lei et al. "Cyclic stress-strain model for large-rupture strain fiber-reinforced polymer (LRS FRP)-confined concrete" . | Journal of Building Engineering 42 (2021) . |
| APA | Bai, Yu-Lei , Mei, Shi-Jie , Li, Pengda , Xu, Junjie . Cyclic stress-strain model for large-rupture strain fiber-reinforced polymer (LRS FRP)-confined concrete . | Journal of Building Engineering , 2021 , 42 . |
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