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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 ：
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 ：
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 ：
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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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 ：
Compressive behavior Compressive behavior Confinement Confinement Engineered cementitious composite (ECC) Engineered cementitious composite (ECC) Fiber-reinforced polymer (FRP) Fiber-reinforced polymer (FRP) 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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摘要 ：
This paper presents an experimental study on the impact performance of concrete columns confined with largerupture-strain (LRS, tensile rupture strain >= 5%) fiber reinforced polymer (FRP) jackets. A total of 32 concrete specimens were prepared and tested using large-capacity drop-weight equipment. The test variables included four impact heights (2, 3, 4 and 5 m), three types of FRP, i.e., aramid FRP (AFRP), polyethylene naphthalate (PEN) FRP and polyethylene terephthalate (PET) FRP and two layers of FRP jackets (1 and 2). The time histories of impact force and FRP rupture strain as well as failure modes were obtained from the test. Compared to the AFRP-confined concrete specimen with similar jacket stiffness, the core concrete of the LRS FRP-confined specimen was less damaged due to the large-rupture-strain characteristic. The impact force increased and the impact duration decreased with increasing impact height. The impact duration of concrete specimens confined with LRS FRP was longer than that of the AFRP-confined concrete column. Results showed that the impactresistance behaviours of LRS FRP-confined concrete column outperformed its companion column confined with AFRP. Besides, increasing the thickness of FRP jacket can enhance the impact resistance capacity. These findings may facilitate the impact resistance strengthening/retrofitting of RC structures with the application of LRS FRP composites.
关键词 ：
Drop-weight Drop-weight Failure mode Failure mode Impact resistance Impact resistance LRS FRP-confined concrete LRS FRP-confined concrete
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| GB/T 7714 | Yan, Zhi-Wei , Bai, Yu-Lei , Ozbakkaloglu, Togay et al. Axial impact behavior of Large-Rupture-Strain (LRS) fiber reinforced polymer (FRP)-confined concrete cylinders [J]. | COMPOSITE STRUCTURES , 2021 , 276 . |
| MLA | Yan, Zhi-Wei et al. "Axial impact behavior of Large-Rupture-Strain (LRS) fiber reinforced polymer (FRP)-confined concrete cylinders" . | COMPOSITE STRUCTURES 276 (2021) . |
| APA | Yan, Zhi-Wei , Bai, Yu-Lei , Ozbakkaloglu, Togay , Gao, Wan-Yang , Zeng, Jun-Jie . Axial impact behavior of Large-Rupture-Strain (LRS) fiber reinforced polymer (FRP)-confined concrete cylinders . | COMPOSITE STRUCTURES , 2021 , 276 . |
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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 ：
CFRP CFRP Near-fault ground motion Near-fault ground motion PET PET Prefabricated bridge pier Prefabricated bridge pier Reinforcement Reinforcement 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 ：
Prefabricated post-tensioned pre-stress concrete (PC) T-girder is one of the common structural forms for bridge superstructure to achieve better quality control, higher construction speed and lower downtime to the transportation system. However, vertical cracks are frequently observed at the web of girder ends after prestress is applied, which could impose an adverse effect on the durability of girders when exposed to aggressive environment. In this paper, the mechanism of this cracking pattern and corresponding countermeasures were investigated by a numerical study as well as practical engineering applications. To begin with, a nonlinear three-dimensional (3D) finite element model was developed to simulate a typical PC T-girder in the platform of ABAQUS. The model was loaded based on the sequence of post-tensioning. It was found that the vertical crack pattern is caused by the large friction resistance and bond strength at the contact surface between the girder and supporting steel pedestal as well as the stress concentration at the girder ends due to the cambering effect of girder during the application of prestress. In addition, a practical method was proposed to control this crack pattern by introducing an isolation cushion made of a thin wood piece to the bottom of girder end. The reliability of this method was verified by numerical analysis and engineering practice. Therefore, it can be used to control vertical cracks at the ends of prefabricated post-tensioned PC bridge T-girders during construction.
关键词 ：
cracking control method cracking control method isolation cushion isolation cushion prefabricated post-tensioned PC girder prefabricated post-tensioned PC girder vertical cracks vertical cracks
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| GB/T 7714 | Jia, Junfeng , Zhang, Kaidi , Wu, Suiwen et al. Vertical cracking at girder ends during post-tensioning of prefabricated prestress concrete bridge T-girders [J]. | STRUCTURAL CONCRETE , 2021 , 22 (5) : 3094-3108 . |
| MLA | Jia, Junfeng et al. "Vertical cracking at girder ends during post-tensioning of prefabricated prestress concrete bridge T-girders" . | STRUCTURAL CONCRETE 22 . 5 (2021) : 3094-3108 . |
| APA | Jia, Junfeng , Zhang, Kaidi , Wu, Suiwen , Xiong, Tianxiang , Bai, Yulei , Li, Weifeng . Vertical cracking at girder ends during post-tensioning of prefabricated prestress concrete bridge T-girders . | STRUCTURAL CONCRETE , 2021 , 22 (5) , 3094-3108 . |
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