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学者姓名：白玉磊
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摘要 ：
Flax fibers have been widely used as reinforcing materials due to the growing demand for the development of sustainable materials. They are cost-effective and have excellent mechanical properties. In this study, the dynamic tensile properties of flax FRP coupons were tested using an Instron VHS high rate testing system. The effect of strain rate on the failure process, failure modes, tensile strength, failure strain, and Young's modulus of flax FRP coupons were discussed and analyzed within the strain rate less than 164.2 s-1. The failure process at different strain rates were captured by a high-speed camera. It was observed that the specimen failed with only one cross-sectional fracture at a relatively low strain rate. At a relatively high strain rate, more than one fracture was observed. The experimental results indicated that the dynamic tensile strength increased, failure strain decreased, and Young's modulus remained almost unchanged when the strain rate was less than 41.3 s-1. As it was over 41.3 s-1, the dynamic tensile strength, failure strain, and Young's modulus had a prominent rise. To describe the dynamic tensile strength, failure strain, and Young's modulus at a certain strain rate, empirical equations based on the experimental data were proposed for reference.
关键词 ：
failure modes failure modes dynamic increase factor dynamic increase factor flax fiber reinforced polymer coupons flax fiber reinforced polymer coupons Dynamic tensile properties Dynamic tensile properties
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| GB/T 7714 | Yan, Zhi-Wei , Bai, Yu-Lei , Zhou, Qing-Chang . Dynamic tensile properties of flax fiber reinforced polymer composites [J]. | JOURNAL OF REINFORCED PLASTICS AND COMPOSITES , 2024 . |
| MLA | Yan, Zhi-Wei 等. "Dynamic tensile properties of flax fiber reinforced polymer composites" . | JOURNAL OF REINFORCED PLASTICS AND COMPOSITES (2024) . |
| APA | Yan, Zhi-Wei , Bai, Yu-Lei , Zhou, Qing-Chang . Dynamic tensile properties of flax fiber reinforced polymer composites . | JOURNAL OF REINFORCED PLASTICS AND COMPOSITES , 2024 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper proposed a novel composite column with exceptional resilience and corrosion resistance achieved through the casting of engineered cementitious composites (ECCs) in the plastic hinge region and the utilization of steel-FRP composite bars (SFCBs). A total of six specimens were tested under constant axial load and cyclic lateral load to examine their seismic performance and reparability. The influence of the type of longitudinal reinforcement (steel bar, SFCB, and GFRP bar) and the matrix type (ECC and concrete) in the plastic hinge region was discussed. Test results indicated that configuring SFCB in the columns facilitated drift-hardening characteristics, which in turn enhanced resilience. The adoption of ECC in the plastic hinge region further reduced residual deformation of the composite columns while significantly improving both lateral strength and ductility. The maximum repairable limit of the specimens increases by a factor of 1.36, 1.86, and 2.5, respectively, as the FRP content increases from 0% to 31.3%, 56.4%, and 100%. The specimens reinforced with SFCBs can be quickly restored to their intended use without repair, before reaching a 2% drift ratio. The slip effect of SFCBs has a substantial impact on increasing the lateral displacement of test columns, and this effect tends to increase with an increase in FRP content. A fiber model was developed for predicting the skeleton curves, and its accuracy was validated through comparisons between the predicted and test results.
关键词 ：
Resilience Resilience Fiber model Fiber model SFCB SFCB ECC ECC Slip Slip Corrosion resistance Corrosion resistance
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| GB/T 7714 | Zhang, Yufeng , Bai, Yulei , Han, Shiwen et al. Seismic behavior of novel resilient and corrosion-resistant composite columns using strain-hardening engineered cementitious composites and steel-FRP composite bars [J]. | ENGINEERING STRUCTURES , 2024 , 305 . |
| MLA | Zhang, Yufeng et al. "Seismic behavior of novel resilient and corrosion-resistant composite columns using strain-hardening engineered cementitious composites and steel-FRP composite bars" . | ENGINEERING STRUCTURES 305 (2024) . |
| APA | Zhang, Yufeng , Bai, Yulei , Han, Shiwen , Milani, Gabriele , Jin, Xiaojie . Seismic behavior of novel resilient and corrosion-resistant composite columns using strain-hardening engineered cementitious composites and steel-FRP composite bars . | ENGINEERING STRUCTURES , 2024 , 305 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In recent years, the rapid development of Internet of Things (IoT) technology has greatly advanced research in the field of structural health monitoring. IoT sensors equipped with microprocessors have the ability to process and analyze the collected data in real time, which reduces the data transmission for structural health monitoring and eases the burden of data analysis and processing in the monitoring system. This study proposes a novel IoT device for cable force monitoring and identification that incorporates 4 G and edge computing technologies. The IoT device is developed and designed based on Raspberry Pi 4B and includes a screen, a 4 G module, an acceleration data acquisition card, and a power supply module. To diagnose the status of the tension cable, the IoT device embeds the frequency domain decomposition (FDD) method and the vibration-based cable force identification method. By collecting and analyzing the acceleration signals of the bridge cable, the health status of the cable can be continuously monitored and evaluated. This paper provides a detailed description of the hardware design of the IoT device, the FDD method and the cable force identification method. The accuracy and feasibility of the IoT cable force identification device is verified through experimental studies conducted in the laboratory. In addition, a comparison is made between the data collected by the traditional acquisition system and the microelectromechanical system (MEMS) sensor. The experimental results show that the IoT device can accurately identify the cable force with lower cost and higher convenience.
关键词 ：
Cable force identification Cable force identification Internet of things Internet of things Health monitoring Health monitoring Smart sensor Smart sensor
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| GB/T 7714 | Ni, Pinghe , Zhou, Run , Han, Qiang et al. A novel wireless IoT sensing system for cable force identification and monitoring [J]. | ENGINEERING STRUCTURES , 2024 , 314 . |
| MLA | Ni, Pinghe et al. "A novel wireless IoT sensing system for cable force identification and monitoring" . | ENGINEERING STRUCTURES 314 (2024) . |
| APA | Ni, Pinghe , Zhou, Run , Han, Qiang , Du, Xiuli , Xu, Kun , Jia, Zhenlei et al. A novel wireless IoT sensing system for cable force identification and monitoring . | ENGINEERING STRUCTURES , 2024 , 314 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
An experimental work on the shear strengthening of reinforced concrete (RC) beams completely wrapped by large rupture strain (LRS) FRP is presented in this paper. A total of 14 three-point bending tests were carried out on simply supported RC beams, with a focus on the impacts of the shear span-to-depth ratio (1.53, 2.25, and 3.01) and FRP reinforcement ratio (0.37 %, 0.75 %, and 1.12 %) on the shear behavior of RC beams strengthened with LRS FRP. For the beams with a median length, the ductility coefficients increased by 81 %, 154 %, and 335 % with the increase in FRP reinforcement ratio. For the long beams, the ductility coefficients increased by 116 %, 286 %, and 470 % as the FRP reinforcement ratio improved. The ductility markedly improved with the increase in shear span-to-depth ratio. PET FRP's fracture was not found at the ultimate state, and the improvement in midspan deflection after the peak state was mainly contributed by the shear deformation. The strengthened specimens exhibited a ductile shear failure mode. For the short RC beams, the shear capacity was slightly enhanced, and the ductility was not improved after being strengthened. The strengthened short RC beams still showed a brittle diagonal compression failure mode. The experimental shear contribution of PETT FRP was compared with the prediction of the existing design guidelines. Finally, an effective strain model of PET FRP, including the shear span-to-depth ratio effect, was proposed and verified with the experimental results.
关键词 ：
Shear span -to -depth ratio Shear span -to -depth ratio Reinforced concrete beams Reinforced concrete beams Shear capacity Shear capacity PET FRP PET FRP Shear behavior Shear behavior
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| GB/T 7714 | Mei, Shi-Jie , Bai, Yu -Lei , Dai, Jian-Guo . Shear strengthening of reinforced concrete beams completely wrapped by large rupture strain (LRS) FRP [J]. | ENGINEERING STRUCTURES , 2024 , 314 . |
| MLA | Mei, Shi-Jie et al. "Shear strengthening of reinforced concrete beams completely wrapped by large rupture strain (LRS) FRP" . | ENGINEERING STRUCTURES 314 (2024) . |
| APA | Mei, Shi-Jie , Bai, Yu -Lei , Dai, Jian-Guo . Shear strengthening of reinforced concrete beams completely wrapped by large rupture strain (LRS) FRP . | ENGINEERING STRUCTURES , 2024 , 314 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Steel rebar buckling is an important failure mode in reinforced concrete (RC) columns. Fiber-reinforced polymer (FRP) composites provide an effective mean that can restrain or delay longitudinal rebar buckling. To accurately predict the strength and ductility of FRP-strengthened rectangular RC columns, it is necessary to accurately evaluate the interactions between FRP confinement and steel reinforcement buckling behavior at as any loading levels as possible. This paper proposed a composite beam model and a tension-bending beam model to evaluate the lateral support stiffness of FRP-wrapped concrete cover on steel reinforcement in the corner regions and flat sides of rectangular columns. Then, the whole stress-strain curves for reinforcing bar buckling behavior considering the lateral support of FRP jackets can be obtained and validated with the existing test database. For FRP-strengthened rectangular RC columns under monotonic axial compression, the overall load-bearing capacity of RC columns can be determined by summarizing axial loads sustained by FRP-confined corresponding plain concrete (PC) columns and the load contribution of steel rebars considering FRP lateral support. The accuracy of the proposed method is demonstrated by comparing theoretical predictions with test results. This calculation method can accurately predict the strength and ductility of FRP-wrapped rectangular columns within a 20% variation margin, which provides a reliable basis for the design of concrete structures.
关键词 ：
Tension -bending model Tension -bending model Rebar buckling Rebar buckling Large rupture strain (LRS) FRP Large rupture strain (LRS) FRP Rectangular RC columns Rectangular RC columns Composite beam model Composite beam model
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| GB/T 7714 | Sun, Peng-Xuan , Bai, Yu -Lei . Theoretical study on FRP-confined rectangular columns considering rebar buckling [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 420 . |
| MLA | Sun, Peng-Xuan et al. "Theoretical study on FRP-confined rectangular columns considering rebar buckling" . | CONSTRUCTION AND BUILDING MATERIALS 420 (2024) . |
| APA | Sun, Peng-Xuan , Bai, Yu -Lei . Theoretical study on FRP-confined rectangular columns considering rebar buckling . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 420 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Bayesian finite element model updating techniques have found widespread application in the structural health monitoring. The conventional Bayesian modeling framework (CBMF) identifies the posterior distribution of structural parameters using data from a single experiment. However, structural parameters exhibit variability due to changes in environmental or experimental conditions, an aspect overlooked by CBMF. In recent years, the hierarchical Bayesian modeling framework (HBMF) has gradually attracted attention. This framework incorporates an additional layer of hyperparameters and utilizes multiple sets of experimental data to describe the variability in structural parameters caused by changes in experimental conditions. Unfortunately, the increase in hyperparameters and data size leads the HBMF to face the dilemma of exceedingly high computational costs. To address this issue, this study proposes an improved hierarchical Bayesian modeling framework (IHBMF). To enhance the computational efficiency of IHBMF, the importance sampling method is employed to simplify the computation of the likelihood function for hyperparameters. Subsequently, a surrogate model based on arbitrary polynomial chaos expansion is introduced to further reduce the computational cost of IHBMF. The framework ' s accuracy and efficiency were validated through analysis of a simply supported beam and a steel pedestrian bridge. The results demonstrate that IHBMF not only delivers a more accurate quantification of structural parameter uncertainty than CBMF but also exhibits higher computational efficiency compared to HBMF, showcasing its superior capability in structural health monitoring applications.
关键词 ：
Hierarchical models Hierarchical models Polynomial Chaos Polynomial Chaos Bayesian model updating Bayesian model updating Uncertainty quantification Uncertainty quantification
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| GB/T 7714 | Li, Qiang , Du, Xiuli , Ni, Pinghe et al. Improved hierarchical Bayesian modeling framework with arbitrary polynomial chaos for probabilistic model updating [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 215 . |
| MLA | Li, Qiang et al. "Improved hierarchical Bayesian modeling framework with arbitrary polynomial chaos for probabilistic model updating" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 215 (2024) . |
| APA | Li, Qiang , Du, Xiuli , Ni, Pinghe , Han, Qiang , Xu, Kun , Bai, Yulei . Improved hierarchical Bayesian modeling framework with arbitrary polynomial chaos for probabilistic model updating . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2024 , 215 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种结构健康监测数据压缩与重构方法，包括以下步骤：输入原始监测信号x，稀疏度K的取值范围[lb, ub]；指定改进灰狼优化算法的种群个数N，最大迭代次数tmax，并构造自适应度函数f(k)；计算最优的稀疏度Kbest以及对应的自适应度f(Kbest)；得到稀疏度为Kbest时的重构信号输出Kbest，f(Kbest)以及本发明可以利用改进灰狼优化算法得到最优的稀疏度，将其输入正交匹配追踪算法后便可得到最优的重构信号，显著了提高了重构信号的精度。
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| GB/T 7714 | 贾俊峰 , 张龙冠 , 陈曦泽 et al. 一种结构健康监测数据压缩与重构方法 : CN202310262169.3[P]. | 2023-03-17 . |
| MLA | 贾俊峰 et al. "一种结构健康监测数据压缩与重构方法" : CN202310262169.3. | 2023-03-17 . |
| APA | 贾俊峰 , 张龙冠 , 陈曦泽 , 白玉磊 , 顾冉星 . 一种结构健康监测数据压缩与重构方法 : CN202310262169.3. | 2023-03-17 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Precast bridge deck panels (PBDPs) have been widely used in bridge engineering in the past decade. However, as the crucial part of connecting adjacent precast members, wet joints are often regarded as the weakest link in the bridge superstructure. To narrow the width of wet joints and reduce the assembling accuracy of U-bars, a total of five full-scale bridge deck panels (BDPs) were designed, which included four precast bridge deck panels with wet joints and one monolithic cast-in-place bridge deck panel (MCIPBDP). The major design variables included reinforcement types (straight bar and U-bar), U-bar lap details (non-contact lap and contact lap) and wet joint filling materials (NC and UHPC). The axial tensile loading tests were conducted to evaluate the tensile behavior of five BDPs. The experimental results demonstrated that all specimens experienced ductile failure, and finally failed due to the yielding of reinforcements. However, due to the insufficient lap length of 150 mm for the specimen P-NS-U200, bond slip appeared, and its ultimate tensile capacity decreased by 23.2% compared to the specimen P-NU-U200. Regarding the specimens P-NU-U200 and P-CU-U200, the difference in ultimate strength between non-contact lap and contact lap was within 3%. In addition, compared with the 500-mm-width normal concrete (NC) wet joint, the tensile capacity of the 200-mm-width UHPC wet joint was increased by 8.8%. Finally, based on the strut-and-tie model and failure mode, a modified calculation formula was proposed for estimating the tensile capacity of PBDPs. The predicted tensile capacity agrees well with the experimental results. The research provides a reference for engineers to guide the project's construction and apply UHPC wet joints in practical engineering.
关键词 ：
Tensile test Tensile test Accelerated bridge construction (ABC) Accelerated bridge construction (ABC) Precast bridge deck panel Precast bridge deck panel Ultra-high performance concrete (UHPC) Ultra-high performance concrete (UHPC) Wet joint Wet joint
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| GB/T 7714 | Jia, Junfeng , Ren, Zhangdi , Bai, Yulei et al. Tensile behavior of UHPC wet joints for precast bridge deck panels [J]. | ENGINEERING STRUCTURES , 2023 , 282 . |
| MLA | Jia, Junfeng et al. "Tensile behavior of UHPC wet joints for precast bridge deck panels" . | ENGINEERING STRUCTURES 282 (2023) . |
| APA | Jia, Junfeng , Ren, Zhangdi , Bai, Yulei , Li, Jian , Li, Bin , Sun, Yagang et al. Tensile behavior of UHPC wet joints for precast bridge deck panels . | ENGINEERING STRUCTURES , 2023 , 282 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
A fiber-reinforced polymer (FRP) confined engineered cementitious composite (ECC) column as a new high-performance composite member achieves significant ductility. Understanding its cyclic behavior is necessary to guide seismic design. This paper presents an experimental study on the compressive behavior of large rupture strain (LRS) FRP and traditional glass FRP (GFRP) jacketed ECC cylinders subjected to full and partial cyclic loadings. Effects of FRP confinement level, FRP type, and loading scheme on the failure pattern, stress-strain relationship, ultimate condition, plastic strain, and stress deterioration ratio were examined. Existing equations for plastic strain and stress deterioration ratio of the envelope and internal cycles were evaluated. Based on the experimental results, new calculation formulas were derived for the plastic strain and stress deterioration ratio. A threshold involving partial unloading/reloading factors was determined to define the effective cycles. In addition, a cyclic model composed of a monotonic envelope model and an unloading/reloading model was developed for estimating the stress-strain hysteresis loops of both GFRP- and LRS FRP-confined ECC cylinders.
关键词 ：
Large rupture strain (LRS) Large rupture strain (LRS) Confinement Confinement Fiber-reinforced polymer (FRP) Fiber-reinforced polymer (FRP) Cyclic loading Cyclic loading Engineered cementitious composite (ECC) Engineered cementitious composite (ECC)
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| GB/T 7714 | Yuan, Wanying , Han, Qiang , Bai, Yulei et al. Cyclic Stress-Strain Behavior and Model for FRP-Confined Engineered Cementitious Composite [J]. | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2023 , 27 (4) . |
| MLA | Yuan, Wanying et al. "Cyclic Stress-Strain Behavior and Model for FRP-Confined Engineered Cementitious Composite" . | JOURNAL OF COMPOSITES FOR CONSTRUCTION 27 . 4 (2023) . |
| APA | Yuan, Wanying , Han, Qiang , Bai, Yulei , Yan, Libo . Cyclic Stress-Strain Behavior and Model for FRP-Confined Engineered Cementitious Composite . | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2023 , 27 (4) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Large rupture strain (LRS) FRPs have great potential to be used for seismic retrofit of RC columns because of its high rupture strain (i.e., > 5%) that provides better confinement effects. However, in FRP-confined RC columns, the longitudinal reinforcements may buckle before the LRS FRP rupture, especially in the case of large stirrup spacing. This study aims to present a 3D finite element (FE) model for simulating the buckling effect of longitudinal reinforcements in LRS FRP-confined RC columns. A modified concrete damaged plasticity model (CDPM) is proposed to consider the deformation and mechanical characteristics of LRS FRP-confined concrete. Removal of failed concrete elements is considered to facilitate the buckling of longitudinal reinforcements in LRS FRPconfined RC columns. The FE analysis accuracy was verified by comparisons with test results. The factors affecting the buckling of longitudinal reinforcements were discussed through an extensive parametric study. Empirical formulas for the stress and strain values at which the longitudinal reinforcement starts to soften were developed. An empirical formula for the ultimate axial strain of LRS FRP-confined RC columns determined by longitudinal reinforcement buckling was also obtained by regression analysis.
关键词 ：
Buckling Buckling Concrete damage plasticity model Concrete damage plasticity model Confined concrete Confined concrete Finite element analysis (FEA) Finite element analysis (FEA) LRS FRP LRS FRP
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| GB/T 7714 | Bai, Yu -Lei , Yang, Hong -Long , Mohammadi, Mohsen et al. 3D FE analysis for buckling behavior of longitudinal reinforcement embedded in LRS FRP-confined concrete under axial compression [J]. | COMPOSITE STRUCTURES , 2023 , 312 . |
| MLA | Bai, Yu -Lei et al. "3D FE analysis for buckling behavior of longitudinal reinforcement embedded in LRS FRP-confined concrete under axial compression" . | COMPOSITE STRUCTURES 312 (2023) . |
| APA | Bai, Yu -Lei , Yang, Hong -Long , Mohammadi, Mohsen , Dai, Jian-Guo . 3D FE analysis for buckling behavior of longitudinal reinforcement embedded in LRS FRP-confined concrete under axial compression . | COMPOSITE STRUCTURES , 2023 , 312 . |
| 导入链接 | NoteExpress RIS BibTex |
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