代旷宇-CSCIED科技核心评价数据库-手机版

单位：郑州大学

研究方向：土木工程

社会任职
郑州大学土木工学院副研究员，主持国家级科研项目1项，省部级项目3项，厅局级项目2项，重点实验室项目1项。

个人介绍
（1）国际期刊Sustainable Engineering Materials青年编委（2）河南省土木建筑学会会员、青年学术分会成员（3）Engineering Structures、Construction and Building Materials、Ocean Engineering、Journal of Building Engineering、International Journal of Hydrogen Energy、Engineering Applications of Artificial Intelligence、Case Studies in Construction Materials、Nuclear Engineering and Technology、Archives of Civil and Mechanical Engineering、Engineering Applications of Artificial Intelligence、Structures、Results in Engineering、Materials、Materials Letters、Applied Sciences、Sustainability、Buildings、Infrastructures、Journal of Marine Science and Engineering、Natural Hazards Research、《工程力学》、《哈尔滨工业大学学报》、《振动工程学报》、《振动与冲击》、《防灾减灾工程学报》、《土木与环境工程学报（中英文）》、《震灾防御技术》、《西安建筑科技大学（自然科学版）》、《地震工程学报》等三十余种国内外期刊审稿人。

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1. Fragility functions for corroded reinforced concrete columns

[学者论文] RS评分：0

作者： Kuang-Yu Dai,Xiao-Hui Yu, Da-Gang Lu, Kai Qian

《Journal of Building Engineering》2024年卷 108124期

摘要：Fragility functions for structural members play an important role in the FEMA P-58 methodology for the seismic performance assessment of structures. In this study, fragility functions were developed for aged reinforced columns with corroded reinforcing bars. To this end, an experimental database containing 120 specimens subjected to repeated cyclic loads was compiled from 20 previous studies. The experimental specimens were categorized into three groups: no corrosion damage (NCD), low corrosion damage (LCD), and high corrosion damage (HCD). These damage states were identified by experimental hysteretic responses in terms of the drift angle, which are linked to common methods of repair, including structural repair, structural enhancement, and component replacement. The obtained drift angles were used to fit the log-normal fragility functions of the NCD, LCD, and HCD columns. The effect of reinforcement corrosion was examined by comparing the fragility functions of uncorroded and corroded columns. According to the principles suggested by FEMA P-58, the developed fragility functions were mostly judged to have a high level of quality. The fragility medians of the corroded columns showed a clear decreasing trend along with an increasing degree of corrosion damage. However, the corrosion of the reinforcing bars had a limited effect on the fragility dispersion. The maximum differences in the exceedance probability were calculated by comparing the fragility curves for the LCD and NCD columns, which were greater than 20 % for all concerned damage states. For the HCD columns, the corrosion of the reinforcing bars led to the maximum difference in the exceedance probability, even beyond 50 %, compared to the results for the NCD columns. The above results reveal the significant effect of the corrosion of the reinforcing bars. The specific fragility functions developed for the corroded reinforced concrete columns will facilitate the seismic loss and resilience assessment of aging reinforced concrete building structures.

关键词：Fragility function；Reinforced concrete；Corrosion；Damage states；Repair method

浏览量: 580 下载: 0 发表时间：2023/12/8 0:00:00

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2. Hysteretic model for corroded reinforced concrete columns retrofitted with FRP

[学者论文] RS评分：0

作者： Kuangyu Dai, Xiaohui Yu, Zhichao Jiang, Daiyu Wang, Kai Qian

《Construction and Building Materials》2023年卷 131207期

摘要：A hysteresis model was developed for fiber reinforced polymer (FRP)-retrofitted reinforced concrete (RC) columns with corroded reinforcing bars. The test data of 49 FRP-retrofitted corroded columns and 19 intact columns (with no corrosion or FRP wraps) under repeat-cyclic loading were collected to establish a database. A polygonal model was adopted to simulate the hysteretic behavior of FRP-retrofitted corroded columns. This was determined using backbone and cyclic parameters. For the backbone parameters, a hybrid influence factor (HIF) was introduced to incorporate the coupling effects of corrosion and FRP retrofitting. A suite of empirical equations was developed using multivariate linear regression analysis to predict the HIFs of each backbone parameter in association with the corrosion rate and important column design parameters. Moreover, an empirical relationship was developed to determine the cyclic parameters of the hysteretic model using a regression analysis. The predicted hysteretic curves were compared with the experimental results, demonstrating sufficient accuracy for both intra- and extra-database tests. Finally, the developed hysteretic model was used to establish a macro-type structural model for the FRP-retrofitted corroded RC frames. This benefitted the analysis of structural collapse under earthquakes, and the effects of the corrosion rate and FRP retrofitting schemes on the seismic collapse capacity of RC frames were examined.

关键词：Hysteretic model；FRP；Corrosion of reinforcing bar；Reinforced concrete column；Collapse analysis

浏览量: 631 下载: 1 发表时间：2023/4/8 0:00:00

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3. Deformation capacity of FRP retrofitted reinforced concrete columns with corroded reinforcing bars

[学者论文] RS评分：9

作者： Kuang-Yu Dai, Xiao-Hui Yu , Kai Qian, Dai-Yu Wang

《Engineering Structures》2022年卷 113834期

摘要：FRP retrofitting is an effective way to promote the degraded seismic capacity of reinforced concrete (RC) columns with corroded reinforcing bars. It is important to evaluate whether the performance of a corroded RC column meets the requirement of safety after FRP retrofitting. However, there is little available guidance for evaluating the deformation capacity of FRP retrofitted corroded columns. In this study, the test data of 63 FRP retrofitted corroded columns and 17 FRP retrofitted uncorroded columns under repeated cyclic loads are collected to establish a database. For each specimen, the rotation angles at yielding and ultimate states are determined from the backbone curve. The empirical prediction models are then developed for the yield and ultimate rotation angles of FRP retrofitted corroded columns, which include two parts: 1) the predicted rotation angle for the FRP retrofitted uncorroded RC column, and 2) a Corrosion Influence Factor (CIF) defined as the ratio between the rotation angles of the FRP retrofitted corroded columns to that of the FRP retrofitted uncorroded ones. The former part is represented using the available empirical prediction models, whereas the latter part is represented using the multi-linear relationships through stepwise regression with a backward elimination procedure. Through comparing with the experimental data, the developed empirical prediction models for the yield and ultimate rotation angles of FRP retrofitted corroded columns provide sufficient accuracy. Finally, the parameter “a” is determined in corresponding to different target probability of exceedance, which is required by the ASCE 41-compliant force versus displacement relation for FRP retrofitted corroded RC columns.

关键词：Deformation capacity；Nonlinear modeling parameter；FRP；Corrosion；RC column

浏览量: 731 下载: 2 发表时间：2022/1/11 0:00:00

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1. Fragility functions for corroded reinforced concrete columns

2. Hysteretic model for corroded reinforced concrete columns retrofitted with FRP

3. Deformation capacity of FRP retrofitted reinforced concrete columns with corroded reinforcing bars