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学者姓名：陈伟宏
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Abstract ：
Replacing concrete with engineering cementitious composite (ECC) can improve continuous collapse resistance of structure under accidental load, but bond-slip failure may occur between rebars and ECC during catenary large deformation stage. Here, based on split Hopkinson pressure bar (SHPB) testing device, dynamic bond-slip performance tests between rebars and ECC were conducted. Effects of ECC strength grade, strain rate, and rebar diameter on the ultimate bond strength, stiffness and slip amount were analyzed to obtain the average bond-slip curve between rebars and ECC under high strain rate load and their bond-slip failure mode. Compared with static bond-slip tests, the dynamic bond dynamic increase factor (DIF) was obtained. Furthermore, using the method of sticking strain gauges inside rebar groove, distribution laws of bond stress and relative slip at different anchoring positions were obtained and the bond position function was proposed. Finally, based on test results, the average bond-slip constitutive relation between rebars and ECC was obtained, this relation was then multiplied by the bond position function to obtain the dynamic bond-slip constitutive relation considering effects of anchor position, and provide test basis and theoretical reference for design and finite element analysis of ECC structural components. © 2024 Chinese Vibration Engineering Society. All rights reserved.
Keyword ：
Bridge decks Bridge decks Mechanical testing Mechanical testing Strain rate Strain rate
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| GB/T 7714 | Cui, Shuangshuang , Meng, Yao , Chen, Weihong et al. Bond-slip relation between rebars and ECC under high strain rate load [J]. | Journal of Vibration and Shock , 2024 , 43 (1) : 71-82 . |
| MLA | Cui, Shuangshuang et al. "Bond-slip relation between rebars and ECC under high strain rate load" . | Journal of Vibration and Shock 43 . 1 (2024) : 71-82 . |
| APA | Cui, Shuangshuang , Meng, Yao , Chen, Weihong , Sun, Hao . Bond-slip relation between rebars and ECC under high strain rate load . | Journal of Vibration and Shock , 2024 , 43 (1) , 71-82 . |
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| GB/T 7714 | Chen, Weihong , Han, Chunhui , Xie, Yunjun et al. Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC (vol 409, 133917, 2023) [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 411 . |
| MLA | Chen, Weihong et al. "Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC (vol 409, 133917, 2023)" . | CONSTRUCTION AND BUILDING MATERIALS 411 (2024) . |
| APA | Chen, Weihong , Han, Chunhui , Xie, Yunjun , Lin, Boxu , Cui, Shuangshuang . Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC (vol 409, 133917, 2023) . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 411 . |
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A novel self-healing cementitious composite SMA-ECC is utilized to enhance corrosion resistance and maintain mechanical properties in chloride environment. The purpose of this study is to investigate the impact of the loading level on embedded steel rebar corrosion and the self-healing performance of SMA-ECC. The study examined the damage conditions, mechanical properties, and rebar corrosion resistance following a loading test. Chloride ingress depth and electrochemical tests were adopted to evaluate the corrosion resistance of the specimens. The findings reveal that SMA-ECC exhibits remarkable self-healing abilities in terms of damage recovery and restoration of mechanical properties. Cracks smaller than 50 mu m can achieve a 100 % closure rate in SMA-ECC. It was observed that specimens with less damage (50 %, 70 % damage conditions) displayed improved chloride resistance (SMA-ECC in 50 % damage condition has equivalent corrosion resistance in terms of corrosion current density compared to intact NC control specimens), leading to higher corrosion resistance for SMA-ECC according to the electrochemical test results.
Keyword ：
Corrosion resistance Corrosion resistance ECC ECC Loading level Loading level Self-healing Self-healing Shape memory alloy Shape memory alloy
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| GB/T 7714 | Chen, Weihong , Lin, Boxu , Zheng, Jianfeng et al. Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Chen, Weihong et al. "Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Chen, Weihong , Lin, Boxu , Zheng, Jianfeng , Cui, Shuangshuang , Zhuang, Shusen . Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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修建于20世纪90年代后的非延性钢筋混凝土(RC)框架结构,在遭遇地震后会有大量的RC框架结构存在一定程度的损伤,而将其推倒重建,将会带来巨大的经济损失和浪费.通过外包碳纤维增强复合材料(CFRP)加固方法对这些震损结构进行加固,可以极大程度地解决该难题.为研究外包CFRP加固后的震损非延性RC框架结构的抗震性能,本文基于OpenSees有限元分析软件对其缩尺模型进行分析,并将分析所得的骨架曲线、滞回曲线与试验结果进行对比.二者结果在弹性阶段基本吻合,弹塑性阶段存在一定偏差,但这些偏差在容许范围内.
Keyword ：
CFRP CFRP 抗震性能 抗震性能 数值模拟 数值模拟 框架结构 框架结构
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| GB/T 7714 | 吴凤英 , 陈晖 , 陈伟宏 . 外包CFRP加固震损非延性混凝土框架有限元计算方法 [J]. | 工程抗震与加固改造 , 2024 , 46 (6) : 130-136 . |
| MLA | 吴凤英 et al. "外包CFRP加固震损非延性混凝土框架有限元计算方法" . | 工程抗震与加固改造 46 . 6 (2024) : 130-136 . |
| APA | 吴凤英 , 陈晖 , 陈伟宏 . 外包CFRP加固震损非延性混凝土框架有限元计算方法 . | 工程抗震与加固改造 , 2024 , 46 (6) , 130-136 . |
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为研究工程水泥基复合材料(Engineering Cementitious Composite,ECC)管桩的抗冲击性能,采用Ansys/LS-DYNA对管桩受竖向落锤冲击作用进行模拟.基于静态拉压试验和动态压缩试验获得关键参数,建立ECC管桩的HJC(Holmquist-Johnson-Cook)本构模型,通过霍普金森压杆试验(Split Hopkinson Pressure Bar,SHPB)验证有限元模型的正确性.对不同锤体质量和冲击速度组合的管桩模型进行参数化分析,得到管桩在不同冲击能量下的位移、能量时程曲线和有效塑性应变图等动力响应.结果表明:在竖向冲击作用下,ECC管桩的最大残余变形只有高强混凝土(High-Strength Concrete,HC)管桩的66.0%,最小残余变形仅为HC管桩的13.7%;且ECC管桩释放的变形能占比平均为HC管桩的6.26倍.表明ECC管桩较HC管桩有更好的抗损伤能力和弹性恢复能力.
Keyword ：
LS-DYNA LS-DYNA 工程水泥基复合材料(ECC) 工程水泥基复合材料(ECC) 抗冲击性能 抗冲击性能 管桩 管桩 高强混凝土(HC) 高强混凝土(HC)
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| GB/T 7714 | 曾庆有 , 叶晨峰 , 刘俊俊 et al. 基于LS-DYNA的ECC管桩的抗冲击性能分析 [J]. | 中外公路 , 2024 , 44 (5) : 210-217 . |
| MLA | 曾庆有 et al. "基于LS-DYNA的ECC管桩的抗冲击性能分析" . | 中外公路 44 . 5 (2024) : 210-217 . |
| APA | 曾庆有 , 叶晨峰 , 刘俊俊 , 冯凯 , 程沛媛 , 陈伟宏 . 基于LS-DYNA的ECC管桩的抗冲击性能分析 . | 中外公路 , 2024 , 44 (5) , 210-217 . |
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Abstract ：
To evaluate the chloride ion corrosion resistance of proposed innovative self-healing concrete based on shape memory alloys (SMA) and engineering cementitious composites (ECC), a total of 2 kinds of 22 specimens were prepared. Chloride ion corrosion tests of self-healing SMA-ECC concrete under dry-wet cycles were carried out. It was found that the chloride ion erosion depths of SMA-ECC were significantly smaller than that of MC, and the growth rate of erosion depth of SMA-ECC was obviously smaller than that of MC after 15 dry-wet (dry and wet) corrosion cycles. The chloride ion content of SMA-ECC vanished at the erosion depth more than 10 mm, which was consistent with the test result of AgNO3 solution color-rendering test. Test results indicate that, compared to marine concrete (MC), SMA-ECC has a better chloride ion corrosion resistance behavior. Moreover, the chloride ion concentration of SMA-ECC at a chloride ion erosion depth of less than 10 mm decreased more significantly than that of MC, indicating that almost all chloride salt solution reacted in the outer layer of SMA-ECC, which is consistent with the conclusions of 4.1 and 4.2. Finally, based on the erosion distribution of chloride ions and Fick's second law, a calculation model describing the relationship between the apparent chloride ion diffusion coefficient and the boundary condition of the chloride ion content was proposed.
Keyword ：
chloride ion corrosion resistance chloride ion corrosion resistance dry-wet cycles dry-wet cycles marine concrete marine concrete non-destructive non-destructive self-healing self-healing
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| GB/T 7714 | Chen, Weihong , Liu, Yi , Qian, Hui et al. Chloride Ion Corrosion Resistance of Innovative Self-Healing SMA Fiber-Reinforced Engineering Cementitious Composites under Dry-Wet Cycles for Ocean Structures [J]. | BUILDINGS , 2023 , 13 (2) . |
| MLA | Chen, Weihong et al. "Chloride Ion Corrosion Resistance of Innovative Self-Healing SMA Fiber-Reinforced Engineering Cementitious Composites under Dry-Wet Cycles for Ocean Structures" . | BUILDINGS 13 . 2 (2023) . |
| APA | Chen, Weihong , Liu, Yi , Qian, Hui , Wu, Peng , Wu, Yingxiong , Liu, Fanghao . Chloride Ion Corrosion Resistance of Innovative Self-Healing SMA Fiber-Reinforced Engineering Cementitious Composites under Dry-Wet Cycles for Ocean Structures . | BUILDINGS , 2023 , 13 (2) . |
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本发明公开了一种功能梯度自愈合高强混凝土管桩及其制备方法，包括ECC及自愈合混凝土配料、ECC及自愈合混凝土搅拌、钢筋笼制作、功能梯度分段喂料合模、离心成型、拆模及养护。在ECC及自愈合混凝土中掺加了活性掺合料(粉煤灰、矿粉等)和高性能减水剂，加速水泥水化反应，免除常规工艺拆模后的高压蒸养，节约能源，制备的管桩只在易开裂的两端布置自愈合混凝土，不易开裂的中部用强度相近ECC代替，通过功能梯度的方法使两者之间性能梯度渐变而不会产生界面破坏，可以有效解决现有混凝土管桩易开裂、在腐蚀环境下耐久性差的问题。
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| GB/T 7714 | 陈伟宏 , 冯凯 . 一种功能梯度自愈合高强混凝土管桩及其制备方法 : CN202210017336.3[P]. | 2022-01-08 00:00:00 . |
| MLA | 陈伟宏 et al. "一种功能梯度自愈合高强混凝土管桩及其制备方法" : CN202210017336.3. | 2022-01-08 00:00:00 . |
| APA | 陈伟宏 , 冯凯 . 一种功能梯度自愈合高强混凝土管桩及其制备方法 : CN202210017336.3. | 2022-01-08 00:00:00 . |
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To study the seismic strengthening of damaged reinforced concrete (RC) frames using CFRP sheets, this study designed and tested the scaled 2-bay and 2-storey RC frame specimens. After applying a low cyclic horizontal load to simulate the initial damage to the specimen in an earthquake disaster, CFRP was used to strengthen the joints of the damaged RC frame. Pseudo-static tests of strengthened specimens and counterpart specimens were then carried out. Seismic performance, including stiffness, load capacity, ductility and energy dissipation were further analyzed. The failure mode of strengthened RC frame structures showed excellent ductility. The results demonstrated that the strengthening method involving wrapping CFRP can significantly improve the maximum horizontal bearing capacity, initial stiffness and energy dissipation capacity of the non-ductile reinforced concrete frame structure. The average displacement ductility coefficient of strengthened specimen can be enhanced to 3.41 compared with that of counterpart specimen (3.00). The pushover analysis based on the OpenSees model determined that the prototype frame with CFRP strengthening can maintain structural integrity and safety, with its maximum interstorey displacement angle below the limit of seismic specification (i.e., 1/50 in a severe earthquake). This study can contribute to the development of practical and efficient methods for restoring and improving the performance of damaged RC frames in seismic-prone regions.
Keyword ：
CFRP CFRP earthquake-damaged RC frames earthquake-damaged RC frames initial damage initial damage pseudo-static test pseudo-static test seismic strengthening seismic strengthening
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| GB/T 7714 | Wang, Yao , Chen, Weihong , Li, Dong et al. Experimental and Numerical Investigations of the Seismic Performance of Reinforced Concrete Frames Strengthened with CFRP Sheets [J]. | BUILDINGS , 2023 , 13 (9) . |
| MLA | Wang, Yao et al. "Experimental and Numerical Investigations of the Seismic Performance of Reinforced Concrete Frames Strengthened with CFRP Sheets" . | BUILDINGS 13 . 9 (2023) . |
| APA | Wang, Yao , Chen, Weihong , Li, Dong , Xu, Hongguang , Zhang, Feng , Guo, Xiao . Experimental and Numerical Investigations of the Seismic Performance of Reinforced Concrete Frames Strengthened with CFRP Sheets . | BUILDINGS , 2023 , 13 (9) . |
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A two-stage compressive test was adopted to study the self-healing performance of a smart cementitious composite SMA-ECC under compression. The ultrasonic pulse and sorptivity tests were used to track self-healing ability and resistance to internal damage, respectively. A total of 32 groups of specimens, including 28 groups of SMA-ECC specimens and 4 groups of ordinary ECC specimens, were tested with various fiber contents and preloading levels. The strength recovery rate, relative dynamic elastic modulus recovery rate before and after self-healing, and cumulative water absorption were measured during the tests. It was found that the strength recovery rate of the SMA-ECC increased by 29.2% to 37.2% compared to the ordinary ECC. The elastic modulus recovery rate after self-healing of the SMA-ECC is approximately 3 to 10 times that of the ordinary ECC, and SMA-ECC with a 0.9% fiber content exhibits the best healing effect, with a remarkable 194% increase in elastic modulus recovery rate compared to ECC. As for internal damage, an increase in fiber content corresponds to a decrease in relative sorptivity coefficient (eta) in most cases. Notably, for SMA-ECC specimens featuring a 0.9% fiber content, eta reaches its nadir, hovering around 0.7. The situation takes an unexpected turn when fiber content hits 1%, as the relative sorptivity coefficient experiences a 14.9% increment compared to the SMA-ECC with 0.9% fiber content. Based on the test results, it is concluded that the SMA-ECC has excellent compressive recovery performance and the ability to resist internal damage. The optimal SMA fiber content for the self-healing performance of the SMA-ECC is determined to be 0.7% to 0.9%.
Keyword ：
Compressive state Compressive state Preloading level Preloading level Self-healing Self-healing SMA-ECC SMA-ECC SMA fiber content SMA fiber content
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| GB/T 7714 | Chen, Weihong , Han, Chunhui , Xie, Yunjun et al. Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 409 . |
| MLA | Chen, Weihong et al. "Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC" . | CONSTRUCTION AND BUILDING MATERIALS 409 (2023) . |
| APA | Chen, Weihong , Han, Chunhui , Xie, Yunjun , Lin, Boxu , Cui, Shuangshuang . Evaluation of compression self-healing performance of a smart cementitious composite SMA-ECC . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 409 . |
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The seismic performance of the innovative steel-reinforced reactive powder concrete (SRRPC) composite columns was evaluated via the cyclic experiments considering the steel shape ratio, axial compression ratio and the stirrup ratio. The SRRPC columns generally exhibited appreciable seismic behavior, great crack-resistance and excellent anti-spalling property. It was found that increasing the steel shape ratio from 4.20% to 5.35% can significantly enhance the ductility and the energy dissipation capacity. As the axial compression ratio increased from 0.1 to 0.3, the peak lateral load increased but the ductility significantly decreased. Increasing the stirrup ratio from 1.57% to 2.52% was not helpful for seismic performance in the pre-peak zone but was beneficial to the strength and ductility in the post-peak zone. Moreover, the average strength loss of the SRRPC columns with low axial compression ratio at the 4.5% drift ratio was less than 12.5%, satisfying the modern seismic drift criteria. Two coefficients, & beta;tu and k, for predicting the equivalent tensile strength were identified and compared to the suggested values from the specifications JGJ/T 465-2019 and T/CCPA 35-2022, respectively. An analytical model was successfully developed to predict the lateral load-bearing capacity. Good agreements were found between the experimental and analytical results.
Keyword ：
Composite column Composite column Hysteretic behavior Hysteretic behavior Lateral load -bearing capacity Lateral load -bearing capacity Reactive powder concrete Reactive powder concrete Steel -reinforced concrete Steel -reinforced concrete
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| GB/T 7714 | Zhang, Lingfeng , Wang, Kun , Zhang, Ming et al. Seismic performance of steel-reinforced reactive powder concrete columns [J]. | STRUCTURES , 2023 , 54 : 1788-1802 . |
| MLA | Zhang, Lingfeng et al. "Seismic performance of steel-reinforced reactive powder concrete columns" . | STRUCTURES 54 (2023) : 1788-1802 . |
| APA | Zhang, Lingfeng , Wang, Kun , Zhang, Ming , Yang, Yang , Liu, Fengcheng , Yang, Dongdong et al. Seismic performance of steel-reinforced reactive powder concrete columns . | STRUCTURES , 2023 , 54 , 1788-1802 . |
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