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学者姓名：贾俊峰
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Abstract ：
为评估地震作用下大应变纤维增强聚合物(large rupture strain fiber reinforced polymer, LRS FRP)加固桥梁的抗震性能，以一典型三跨连续梁桥为例进行了研究。目前关于LRS FRP约束混凝土往复轴压模型的研究较少，限制了LRS FRP加固桥梁的抗震分析。因此介绍了作者课题组提出的简化LRS FRP约束混凝土往复轴压模型，根据此模型并结合地震易损性分析理论，基于OpenSees平台，采用增量动力分析(incremental dynamic analysis, IDA)方法，对三跨连续梁桥在LRS FRP加固前后的地震易损性进行了分析。结果表明：轻微损伤和中等损伤状态下桥梁墩柱基本处于未受损坏的线弹性阶段，LRS FRP加固对其地震易损性影响不大；严重破坏和完全倒塌状态下，未加固桥梁的损坏超越概率明显大于LRS FRP加固的桥梁。提出的简化LRS FRP约束混凝土往复轴压模型可为LRS FRP加固桥梁的抗震分析提供参考。
Keyword ：
增量动力分析 增量动力分析 OpenSees OpenSees 桥梁工程 桥梁工程 地震易损性 地震易损性 桥梁墩柱 桥梁墩柱 LRS FRP LRS FRP
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| GB/T 7714 | 白玉磊 , 张玉峰 , 梅世杰 et al. 大应变FRP加固连续梁桥地震易损性分析 [J]. | 哈尔滨工业大学学报 , 2023 , 55 (09) : 84-91 . |
| MLA | 白玉磊 et al. "大应变FRP加固连续梁桥地震易损性分析" . | 哈尔滨工业大学学报 55 . 09 (2023) : 84-91 . |
| APA | 白玉磊 , 张玉峰 , 梅世杰 , 贾俊峰 , 杜修力 . 大应变FRP加固连续梁桥地震易损性分析 . | 哈尔滨工业大学学报 , 2023 , 55 (09) , 84-91 . |
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Abstract ：
为了可靠、准确地预测钢管混凝土(CFST)柱的轴向承载力,建立和解释集成机器学习的CFST柱轴向承载力预测模型.使用马氏距离评估CFST柱数据库质量,通过极限梯度提升(XGBoost)算法建立CFST柱轴向承载力预测模型,使用K折交叉验证(K-Fold CV)和树结构概率密度估计(TPE)算法寻找模型的最优超参数组合.采用不同评价指标将优化后XGBoost模型的预测值与已有方法和未优化XGBoost模型的计算值比较.使用SHAP方法给出XGBoost模型预测结果的整体和局部的解释.结果表明,经过超参数调整优化的XGBoost模型的性能超越了相关规范和经验公式的性能,且SHAP方法能够有效地解释XGBoost模型的输出.
Keyword ：
SHAP SHAP 轴向承载力 轴向承载力 可解释性 可解释性 钢管混凝土(CFST)柱 钢管混凝土(CFST)柱 超参数优化 超参数优化 极限梯度提升(XGBoost) 极限梯度提升(XGBoost)
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| GB/T 7714 | 陈曦泽 , 贾俊峰 , 白玉磊 et al. 基于XGBoost-SHAP的钢管混凝土柱轴向承载力预测模型 [J]. | 浙江大学学报（工学版） , 2023 , 57 (6) : 1061-1070 . |
| MLA | 陈曦泽 et al. "基于XGBoost-SHAP的钢管混凝土柱轴向承载力预测模型" . | 浙江大学学报（工学版） 57 . 6 (2023) : 1061-1070 . |
| APA | 陈曦泽 , 贾俊峰 , 白玉磊 , 郭彤 , 杜修力 . 基于XGBoost-SHAP的钢管混凝土柱轴向承载力预测模型 . | 浙江大学学报（工学版） , 2023 , 57 (6) , 1061-1070 . |
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Abstract ：
Buckling of the longitudinal rebar is one of the main forms of plastic hinge failure in reinforced concrete (RC) columns after an earthquake. This rebar buckling significantly impacts the seismic bearing capacity and energy dissipation capacity. To restrain the development of longitudinal rebar buckling behavior and delay the degradation of lateral strength in RC columns, this paper developed a new type of buckling restraint rebar (BRR) consisting of three components: longitudinal rebar, a restraint sleeve, and foam material. First, the BRR mechanical properties under compression and tension-compression cyclic loading were obtained through quasi-static loading tests. Then, the BRR compression and tension-compression cyclic loading processes were numerically simulated based on ABAQUS finite element software. The simulated results were compared with the test results. Finally, a stress-strain constitutive model for this new BRR was proposed based on this study. Results showed that the restraint sleeve could significantly enhance the lateral stiffness and the bearing capacity of longitudinal reinforcement after yielding. The compressive performance of BRR was mainly affected by the length and wall thickness of the sleeve. The cyclic performance was mainly affected by the length of the sleeve and the clearance between the sleeve and the reinforcement. The BRR constitutive model proposed in this paper can accurately reflect the influence of restraint sleeves on the stiffness of longitudinal reinforcement after yielding.
Keyword ：
constitutive model constitutive model buckling behavior buckling behavior buckling restraint rebar (BRR) buckling restraint rebar (BRR) axial compression axial compression
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| GB/T 7714 | Jia, Junfeng , Zhao, Nannan , Bai, Yulei et al. Mechanical properties and constitutive model of the buckling restraint rebar under compression loads [J]. | STRUCTURAL CONCRETE , 2023 , 24 (5) : 6070-6086 . |
| MLA | Jia, Junfeng et al. "Mechanical properties and constitutive model of the buckling restraint rebar under compression loads" . | STRUCTURAL CONCRETE 24 . 5 (2023) : 6070-6086 . |
| APA | Jia, Junfeng , Zhao, Nannan , Bai, Yulei , Cao, Yanhui , Cheng, Shoushan , Fan, Ping . Mechanical properties and constitutive model of the buckling restraint rebar under compression loads . | STRUCTURAL CONCRETE , 2023 , 24 (5) , 6070-6086 . |
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Abstract ：
Prestressed structures are widely employed in bridges and large-span spatial structures, and the accurate evaluation of prestress state is of great importance for structural maintenance. This paper reviews the nondestructive testing (NDT) and health monitoring techniques for structural effective prestress. Specifically, the fiber Bragg grating (FBG) sensor-based, magnetic-elastic (ME) sensor-based, dynamic response-based, ultrasonic guided wave (UGW)-based, electromechanical impedance (EMI)-based, and electrical resistance-based methods are reviewed in this paper. Firstly, the principle, application range, and measuring accuracy of each technique are introduced and analyzed, and the benefits and limitations of each technique are summarized: The FBG sensor and ME sensor take on high measuring accuracy and have been applied in practical engineering, but they are required to be preinstalled during structural construction; the dynamic response-based method is greatly effective in cable force assessment but not suitable for prestress evaluation of prestressed concrete (PSC) structures; the UGW-based, EMI-based, and electrical resistance-based methods have shown favorable potential for prestress assessment in laboratory experiments, but their feasibility and accuracy in practical engineering need to be verified. Secondly, the challenges and discussion of each method are discussed in the following four aspects: measuring range, reliability of measuring results, stability and durability considering long-term monitoring, and cost-efficiency. Finally, a decision tree is proposed to choose the most appropriate prestress evaluation method in a specific application scenario.
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| GB/T 7714 | Jia, Junfeng , Zhang, Longguan , Ou, Jinping et al. Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress [J]. | STRUCTURAL CONTROL & HEALTH MONITORING , 2023 , 2023 . |
| MLA | Jia, Junfeng et al. "Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress" . | STRUCTURAL CONTROL & HEALTH MONITORING 2023 (2023) . |
| APA | Jia, Junfeng , Zhang, Longguan , Ou, Jinping , Chen, Xize . Nondestructive Testing and Health Monitoring Techniques for Structural Effective Prestress . | STRUCTURAL CONTROL & HEALTH MONITORING , 2023 , 2023 . |
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Abstract ：
The vibration signal analysis-based structural health monitoring (SHM) system has been widely used for bridge condition identification. With the development of artificial intelligence (AI), machine learning (ML) has made numerous breakthroughs in the detection of civil engineering structures. However, conventional data-driven ML methods heavily rely on prior knowledge for their performance. This paper proposes a deep learning (DL) model 1DCNN-BiLSTM for detecting small local structural changes of reinforced concrete (RC) beams, which applies the structure of the Inception module in GoogLeNet to one-dimensional convolution neural networks (1DCNNs) for feature extraction at different scales, and combines the advantages of bidirectional long shortterm memory (BiLSTM) modules for processing long time-series data. Firstly, a three-dimensional numerical model of the RC beam was established using finite element software, and the accuracy of the numerical model was verified by comparing it with the test results. Based on the numerical model, tests on RC beams impacted by falling hammers were carried out, and the acceleration signals of the beam in different states were collected as a dataset. The proposed DL model can automatically extract the spatial and temporal domain features in the signals, accurately identify the location of small bridge local variations, the accuracy in the test set is 98.8% compared to 92.6% for a traditional ML model, and has better noise immunity performance and robustness to the missing data than the traditional ML model. Finally, the internal inference process of the model was explored and visualized, illustrating that the model has adaptive learning capabilities.
Keyword ：
Deep learning Deep learning Reinforced concrete beam Reinforced concrete beam Convolutional neural networks Convolutional neural networks Vibration signals Vibration signals Structural health monitoring Structural health monitoring Recurrent neural networks Recurrent neural networks
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| GB/T 7714 | Chen, Xize , Jia, Junfeng , Yang, Jie et al. A vibration-based 1DCNN-BiLSTM model for structural state recognition of RC beams [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2023 , 203 . |
| MLA | Chen, Xize et al. "A vibration-based 1DCNN-BiLSTM model for structural state recognition of RC beams" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 203 (2023) . |
| APA | Chen, Xize , Jia, Junfeng , Yang, Jie , Bai, Yulei , Du, Xiuli . A vibration-based 1DCNN-BiLSTM model for structural state recognition of RC beams . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2023 , 203 . |
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Abstract ：
This paper investigates the cyclic behavior of a steel self-centering (SC) rocking column. The steel SC rocking column consists of an H-section steel column and a pair of shape memory alloy (SMA) slip-friction dampers (SMASFDs). As the kernel part, the SMASFDs enhance SC capability of the rocking column and dissipate the input energy. The working principle of the rocking column is first described, along with the analytical equations that govern the behavior under loading cycles, which are validated by experimental data. The component tests were conducted on the NiTi SMA bar and the slip-friction mechanism, separately. And then, the cyclic loading tests were conducted on a 1:2-scaled rocking column specimen. The considered axial force ratio included 0, 0.1 and 0.2. During the entire experimental procedure, the SMA bars were neither repaired nor replaced. It is found that up to a drift ratio of 7 %, the rocking column maintained stable flag-shaped hysteresis, which is characterized by excellent SC capability and satisfactory damping capacity. The testing results also indicated that increasing axial force ratio effectively increased the strength and stiffness of the rocking column, whereas it reduced the post -decompression stiffness due to the P-Delta effect. Finally, the numerical models were established in ABAQUS and OpenSees, both of which were verified by the experimental data, and a parametric study was carried out.
Keyword ：
Shape memory alloy (SMA) Shape memory alloy (SMA) Experimental test Experimental test Rocking column Rocking column
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| GB/T 7714 | Qiu, Canxing , Liu, Jiawang , Jiang, Tianyuan et al. Experimental study on a steel self-centering rocking column with SMA slip friction dampers [J]. | ENGINEERING STRUCTURES , 2023 , 274 . |
| MLA | Qiu, Canxing et al. "Experimental study on a steel self-centering rocking column with SMA slip friction dampers" . | ENGINEERING STRUCTURES 274 (2023) . |
| APA | Qiu, Canxing , Liu, Jiawang , Jiang, Tianyuan , Jia, Junfeng , Du, Xiuli . Experimental study on a steel self-centering rocking column with SMA slip friction dampers . | ENGINEERING STRUCTURES , 2023 , 274 . |
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Abstract ：
A new type of fiber-reinforced polymer (FRP) with a tensile rupture strain of more than 5% was used for the seismic retrofitting of reinforced concrete (RC) square columns in this paper. A control column and 9 FRPwrapped RC square columns were prepared with different number of FRP layers and FRP types. The seismic performance was comprehensively discussed and analyzed in terms of the failure modes, hysteretic behaviors, cumulative energy dissipation and FRP strain evolution. Experimental results showed that the ductility of specimens had a remarkable improvement as the confinement stiffness increased. Moreover, the buckling of longitudinal bars was restricted and postponed. Numerical analysis was conducted in OpenSees to further research the seismic performance of specimens based on an LRS FRP-confined concrete model and a reinforcing bar buckling model considering FRP confining effect. The simulated results were in close agreement with the experimental results. Parametric analysis was also conducted to investigate the influence of the FRP wrapping thickness, axial compression ratio and longitudinal reinforcement ratio on the seismic performance.
Keyword ：
Buckling of longitudinal reinforcements Buckling of longitudinal reinforcements Large-rupture-strain fiber-reinforced polymer Large-rupture-strain fiber-reinforced polymer Seismic performance Seismic performance (LRS FRP) (LRS FRP) FRP-strengthened RC square column FRP-strengthened RC square column
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| GB/T 7714 | Bai, Yu-Lei , Bai, Shang-Cong , Mei, Shi-Jie et al. Seismic behavior of RC square columns strengthened with LRS FRP under high axial load ratio [J]. | STRUCTURES , 2023 , 56 . |
| MLA | Bai, Yu-Lei et al. "Seismic behavior of RC square columns strengthened with LRS FRP under high axial load ratio" . | STRUCTURES 56 (2023) . |
| APA | Bai, Yu-Lei , Bai, Shang-Cong , Mei, Shi-Jie , Jia, Jun-Feng , Yang, Kai . Seismic behavior of RC square columns strengthened with LRS FRP under high axial load ratio . | STRUCTURES , 2023 , 56 . |
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Abstract ：
Precast segmental columns have been frequently applied in regions of low seismicity due to rapid construction, high quality, and low downtime. Their lateral force-displacement curves were always calculated using iterative models in former studies, which could be time-consuming and arduous. Whereas, a non-iterative model can greatly improve computational efficiency and is preferred by designers. In this study, a non-iterative simplified analytical model was firstly proposed considering different neutral axis depths of the rocking interface. The neutral axis depth approached a constant value during lateral loading according to the results of the former tests and numerical studies. Then, a quasi-static test and finite element model of a precast segmental concrete-filled steel tube (PS-CFST) column were conducted to verify the proposed analytical model. Based on the finite element model, a nonlinear regression equation was set up to predict the constant neutral axis depth of the PS-CFST column according to the simulation results of 48 cases. Finally, the influence of the initial prestressing force, area of the prestressed tendons and gravity load on the lateral force capacity of the PS-CFST column were investigated. It was concluded that the constant value of neutral axis depth was positively related to axial ratio and diameter-thickness ratio, and negatively related to yield strength of steel tube of PS-CFST columns. The analytical model without iteration proposed in this study was appropriate to predict lateral force capacity of post-tensioned precast segmental columns, and it had a favorable agreement with testing and numerical results. Furthermore, the precast column with the lower gravity load and the higher reinforcement ratio of prestressed tendons would result in the larger post-yield stiffness.
Keyword ：
Lateral force -displacement relationship Lateral force -displacement relationship Neutral axis depth Neutral axis depth Finite element analysis Finite element analysis Nonlinear regression Nonlinear regression Simplified model Simplified model Precast segmental bridge column Precast segmental bridge column
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| GB/T 7714 | Zhang, Kaidi , Jia, Junfeng , Li, Ning et al. Analytical model for evaluating lateral force capacity of precast concrete-filled steel tube column [J]. | ENGINEERING STRUCTURES , 2022 , 273 . |
| MLA | Zhang, Kaidi et al. "Analytical model for evaluating lateral force capacity of precast concrete-filled steel tube column" . | ENGINEERING STRUCTURES 273 (2022) . |
| APA | Zhang, Kaidi , Jia, Junfeng , Li, Ning , Zhao, Jianyu , Bai, Yulei . Analytical model for evaluating lateral force capacity of precast concrete-filled steel tube column . | ENGINEERING STRUCTURES , 2022 , 273 . |
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Abstract ：
预应力连接预制节段桥墩已在美国低震区桥梁中得到较多应用，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，震害经验不足，且其抗震机理不明确、设计方法不完善，在强震区较少应用。该文基于预应力连接预制节段墩柱缩尺模型的拟静力往复试验测试，采用有限元分析软件ABAQUS建立其精细化数值模型，进行了单向、斜向往复荷载作用下墩柱拟静力试验数值仿真，将桥墩的损伤特征、滞回行为、墩内竖向预应力和预制节段间接缝开口量与试验测试结果进行了对比分析。结果表明：该文建立的预制节段桥墩数值模型可较好地再现拟静力试验结果，试验和模拟结果均表明斜向加载的预制节段墩柱较单向加载的构件损伤更为严重，构件屈服更早，残余位...
Keyword ：
残余偏移率 残余偏移率 抗震性能 抗震性能 斜向循环加载 斜向循环加载 预制节段拼装桥墩 预制节段拼装桥墩 数值仿真模型 数值仿真模型
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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 [J]. | 工程力学 , 2022 , 39 (S1) : 207-213,228 . |
| 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" . | 工程力学 39 . S1 (2022) : 207-213,228 . |
| APA | 张凯迪 , 贾俊峰 , 白玉磊 , 郭彤 . 预应力连接预制节段桥墩拟静力试验数值仿真分析 . | 工程力学 , 2022 , 39 (S1) , 207-213,228 . |
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Abstract ：
梳理和总结了第16、17届世界地震工程大会(WCEE)中关于韧性抗震梁桥相关的研究进展;分析了后张预应力摇摆自复位梁桥与其他新型韧性抗震梁桥体系的最新研究进展,总结了高性能材料在韧性梁桥中的应用研究,并介绍了国内外自复位梁桥的工程实践;介绍了自复位耗能装置和限位装置等韧性抗震梁桥结构中的可更换装置研究,讨论了附加可更换装置的梁桥结构抗震性能;总结了单体梁桥和桥梁网络的抗震韧性评估方法,探讨了韧性抗震梁桥结构的研究方向和发展趋势.研究结果表明:附加可更换耗能装置的后张预应力自复位梁桥是研究最为广泛的韧性抗震梁桥结构,且已建成了多座示范工程,该类结构在强震中的表现有待实际地震验证;需要结合高性能材料开发可更换装置新结构与新构造,在此基础上研究其与桥梁的合理连接技术及抗震设计方法;考虑性能退化、需求增加等多因素影响的既有梁桥结构抗震韧性评价方法和能力提升技术及其设计理论,是中国已建梁桥面临的突出问题.
Keyword ：
抗震韧性评价 抗震韧性评价 桥梁工程 桥梁工程 桥梁抗震 桥梁抗震 自复位桥梁 自复位桥梁 抗震韧性 抗震韧性 可更换装置 可更换装置
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| GB/T 7714 | 贾俊峰 , 魏博 , 杜修力 et al. 从WCEE看国内外韧性抗震梁桥研究进展 [J]. | 交通运输工程学报 , 2022 , 22 (6) : 25-45 . |
| MLA | 贾俊峰 et al. "从WCEE看国内外韧性抗震梁桥研究进展" . | 交通运输工程学报 22 . 6 (2022) : 25-45 . |
| APA | 贾俊峰 , 魏博 , 杜修力 , 郭彬立 , 郭河 . 从WCEE看国内外韧性抗震梁桥研究进展 . | 交通运输工程学报 , 2022 , 22 (6) , 25-45 . |
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