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学者姓名：林友勤
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As the main force component of cable suspending structure, the cable would have the problems of aging and damage in the bridge operation stage. How to quickly identify the damage of the cable is of great significance to ensure the healthy and stable development of the traffic in China. According to different physical quantities, the damage identification methods such as dynamic based damage identification method, static based damage identification method, dynamic and static combined damage identification method were introduced, and the application of intelligent algorithms of neural network and genetic algorithm in cable damage identification were also discussed. Based on analysis on the damage identification methods for the cables, the problems existing in the damage identification of the cable were concluded. According to features of the actual bridge structural forms, such as external prestressed concrete bridges, long-span cable-stayed bridges, suspension bridges and concrete-filled steel tube arch bridges, etc., the corresponding adaptive identification method should be proposed, which will be more targeted and practical. With the development of big data technology, the combination of traditional indicators and intelligent algorithms will be the research development directions for cable damage identification. © Tongji University Press 2024.
Keyword ：
Arch bridges Arch bridges Cables Cables Cable stayed bridges Cable stayed bridges Damage detection Damage detection Genetic algorithms Genetic algorithms Prestressed concrete Prestressed concrete Tubular steel structures Tubular steel structures
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| GB/T 7714 | Xia, Zhanghua , Yu, Yingen , Xie, Jun et al. Recent Advances in Research on Damage Identification Method for Cables in Bridges [C] . 2024 : 161-175 . |
| MLA | Xia, Zhanghua et al. "Recent Advances in Research on Damage Identification Method for Cables in Bridges" . (2024) : 161-175 . |
| APA | Xia, Zhanghua , Yu, Yingen , Xie, Jun , Lai, Shiyong , Lin, Youqin , Wang, Zhifeng . Recent Advances in Research on Damage Identification Method for Cables in Bridges . (2024) : 161-175 . |
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There is a lack of detection means for the isolation performance of the buildings built by passive control technology，so it is of great significance to test the dynamic characteristics of the isolated structures on the spot. A 4-story base isolation kindergarten was tested in the field，and the test device，method and results were displayed. The results were compared with the seismic structure model under the same conditions，and the dynamic response law and damping effect of the actual isolation structure were explored. The building was pushed away with hydraulic jack to produce 98 mm（corresponding to LNR500 shear strain 102%）hori-zontal initial displacement of the isolation layer，and concrete jacking rod was installed to support the building；The concrete rod was blasted with explosives and unloaded instantly to make the building vibrate freely；The dynamic response and other parameters were tested and analyzed. The results show that under the condition of horizontal initial displacement，the first-order natural vibration period of the isolated structure is significantly longer than that of the seismic structure，and the damping ratio increases；The hysteretic curve of the isolation layer is full；The dynamic response control effect of each floor is obvious，but the acceleration of the roof floor is slightly amplified compared with that of the bottom floor；After unloading，the isolation layer instantly resets，which shows that the isolation layer has rapid reset performance. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.
Keyword ：
Acceleration Acceleration Concretes Concretes Damping Damping Dynamic response Dynamic response Explosives Explosives Floors Floors Hysteresis Hysteresis Seismology Seismology Shear strain Shear strain Unloading Unloading
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| GB/T 7714 | Wu, Ying-Xiong , Dong, Xin-Jun , Liao, Wen-Bin et al. Field dynamic characteristics testing of foundation isolation structures under horizontal initial displacement [J]. | Journal of Vibration Engineering , 2024 , 37 (4) : 578-587 . |
| MLA | Wu, Ying-Xiong et al. "Field dynamic characteristics testing of foundation isolation structures under horizontal initial displacement" . | Journal of Vibration Engineering 37 . 4 (2024) : 578-587 . |
| APA | Wu, Ying-Xiong , Dong, Xin-Jun , Liao, Wen-Bin , Lin, You-Qin , Tang, Zhen-Yun , Zheng, Guo-Chen et al. Field dynamic characteristics testing of foundation isolation structures under horizontal initial displacement . | Journal of Vibration Engineering , 2024 , 37 (4) , 578-587 . |
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With the rapid development of urban transportation，its construction requirements are increasingly high，urban bridges are mainly ramp bridges，ramps and other non-regular bridges. In order to obtain the damage mechanism and hysteresis characteristics of the fabricated pier under the combined seismic action of compression-bending- shearing-torsion，the quasi-static test for three types of bridge piers including prefabricated piers with grouting sleeves（GS），prefabricated piers with grouting sleeve and concrete-filled steel tube（GSS）and cast-in-place reinforced concrete（RC）pier subjected to combined loads was carried out. Combining the shearing-torsion correlation curve in the existing code for design of concrete structures，the shearing and torsion load capacity of the fabricated pier under the combined load was analyzed and compared with the test results. The results show that the GS specimen and RC specimen are dominated by compression bending and torsion damage，while the GSS specimen with inserted steel tube shear keys undergo plastic hinge uplift and exhibit shear torsion damage. GS and RC speci⁃ mens have better bending energy dissipation capacity，while GSS specimen with the steel tube shear key has a larger bending capacity. The assembled pier joints resulted in weaker integrity，and the torsional load capacity of the GS and GSS specimens were less than that of the RC specimen. The shear torsion correlation of each specimen under combined load is close to the quarter-circle theoretical curve in the specification. The research results can provide a reference for the seismic performance analysis of fabricated piers with grouting sleeves under the combined action of compression-bending-shearing-torsion. © 2024 Hunan University. All rights reserved.
Keyword ：
Bridge piers Bridge piers Concrete construction Concrete construction Energy dissipation Energy dissipation Fabrication Fabrication Grouting Grouting Mortar Mortar Reinforced concrete Reinforced concrete Shearing Shearing Torsional stress Torsional stress Tubular steel structures Tubular steel structures Urban transportation Urban transportation
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| GB/T 7714 | Lin, Youqing , Lai, Shiyong , Xia, Zhanghua et al. Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load [J]. | Journal of Hunan University Natural Sciences , 2024 , 51 (3) : 182-192 . |
| MLA | Lin, Youqing et al. "Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load" . | Journal of Hunan University Natural Sciences 51 . 3 (2024) : 182-192 . |
| APA | Lin, Youqing , Lai, Shiyong , Xia, Zhanghua , Wang, Darong . Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load . | Journal of Hunan University Natural Sciences , 2024 , 51 (3) , 182-192 . |
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After coupling long-period seismic motions with the soil-structure interaction (SSI) effect, isolated structures can easily be resonated, and the seismic response of the structure is significantly enhanced. The SSI effect can alter the dynamic characteristics of a structure, resulting in a deviation between the assumed seismic-isolation effect of the rigid foundation and the theoretical results. To investigate the dynamic characteristics and seismic-response laws of interlayer structures considering SSI under long-term seismic motion, four types of ground motions (near-field ordinary, far-field ordinary, near-field pulse, and far-field harmonic ground motions) were selected, and two structural models (rigid-foundation and soft soil foundation interlayer seismic-isolation structure models) were established. Experiments were conducted using a combination of shaking-table tests and finite-element simulations. The results show that the use of the SSI effect caused the decrease in the acceleration response of the upper structure of both models under four types of seismic motions and increased the seismic peak ground acceleration (PGA). In addition, the weakening of the acceleration response of the upper structure under ordinary seismic motion is significant for longer periods of seismic motion. Furthermore, when considering the SSI effect, the displacement response ratio under long periods and ordinary ground motions is greater than that of rigid foundations, and the horizontal deformation of the isolation layer under long-period ground motions is greater than that under ordinary ground motions. This shows that the SSI effect weakens the interlayer shear force under ordinary seismic action more than that under long-period seismic action. When PGA increases, the interlayer shear force response of the interlayer isolation structure model with a soft soil foundation under a long-period seismic action may be smaller than that of the rigid-foundation model.
Keyword ：
long-period ground motion long-period ground motion seismic response seismic response shaking-table test shaking-table test SSI effect SSI effect story isolation story isolation
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| GB/T 7714 | Xu, Liying , Shi, Jianri , Wu, Yingxiong et al. Interlayer Isolation Structures Considering Soil-Structure Interaction under Long-Period Ground Motions: An Experimental Analysis [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (16) . |
| MLA | Xu, Liying et al. "Interlayer Isolation Structures Considering Soil-Structure Interaction under Long-Period Ground Motions: An Experimental Analysis" . | APPLIED SCIENCES-BASEL 13 . 16 (2023) . |
| APA | Xu, Liying , Shi, Jianri , Wu, Yingxiong , Lin, Youqin . Interlayer Isolation Structures Considering Soil-Structure Interaction under Long-Period Ground Motions: An Experimental Analysis . | APPLIED SCIENCES-BASEL , 2023 , 13 (16) . |
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本实用新型公开了一种石梁/石板抗弯加固结构，涉及建筑技术领域，解决现有的石梁加固方法对石梁的抗弯性提升效果较差问题。一种石梁/石板抗弯加固结构，其包括墙体、石梁以及铺设在石梁上并位于墙体两侧的碳纤维板；墙体的顶部设置有加固台，加固台的两端分别通过双向锚固组件与相对应的碳纤维板连接，加固台的外侧设置有对称设置有缓冲减震组件，缓冲减震组件的一端分别与加固台连接，缓冲减震组件的另一端分别与相对应的碳纤维板连接。本实用新型的双向锚固组件与加固台和墙体一体浇筑成型，不仅起到紧固碳纤维板的作用，还增强了楼盖的承载力和抗坍塌能力。
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| GB/T 7714 | 吴应雄 , 林友勤 , 程浩德 et al. 一种石梁/石板抗弯加固结构 : CN202222621986.7[P]. | 2022-09-30 00:00:00 . |
| MLA | 吴应雄 et al. "一种石梁/石板抗弯加固结构" : CN202222621986.7. | 2022-09-30 00:00:00 . |
| APA | 吴应雄 , 林友勤 , 程浩德 , 李飞燕 . 一种石梁/石板抗弯加固结构 : CN202222621986.7. | 2022-09-30 00:00:00 . |
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本实用新型涉及一种系梁扩大组合连接桩柱的多柱式装配式墩体系，包括自上往下依次设置的盖梁、墩柱、承台、桩基，承台的上表面设置凹槽，墩柱底部放置在凹槽内，盖梁和墩柱的内底部均预留有连接套管，墩柱内部的若干预留纵向钢筋上部与盖梁内埋设的若干预留钢筋通过连接套管搭接，墩柱内部的若干预留纵向钢筋下部与承台的若干预留钢筋通过连接套管搭接，墩柱与凹槽之间的间隙处填充浇筑有后浇混凝土层，后浇混凝土层采用UHPC混凝土，相邻承台之间通过系梁连接。提高了抗裂性，增加连接整体性，施工速度大大提升；相邻承台之间用系梁连接使得其连成整体受力，整体刚度加强；系梁中使用局部弯曲钢筋，弯曲钢筋承受弯矩作用，提高了其抗弯承载力。
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| GB/T 7714 | 夏樟华 , 赖仕永 , 巩涛 et al. 系梁扩大组合连接桩柱的多柱式装配式墩体系 : CN202223090178.9[P]. | 2022-11-17 00:00:00 . |
| MLA | 夏樟华 et al. "系梁扩大组合连接桩柱的多柱式装配式墩体系" : CN202223090178.9. | 2022-11-17 00:00:00 . |
| APA | 夏樟华 , 赖仕永 , 巩涛 , 朱祖科 , 蓝亦辉 , 林友勤 et al. 系梁扩大组合连接桩柱的多柱式装配式墩体系 : CN202223090178.9. | 2022-11-17 00:00:00 . |
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本实用新型涉及一种无损控制的多柱式装配式墩结构体系，包括自上往下依次设置的盖梁、墩柱、承台、桩基，承台的上表面设置凹槽，墩柱底部放置在凹槽内，且墩柱与凹槽之间的端部间隙与周部间隙中均设有隔震橡胶垫进行填充，盖梁和墩柱的内底部均预留连接套管，墩柱中的若干预留纵筋上部与盖梁内埋设的若干预留钢筋通过连接套管搭接，墩柱中的若干预留纵筋下部与承台的若干预留钢筋通过连接套管搭接，各承台之间通过系梁连接。有出色的隔震作用，可减少活载与地震力对建筑物的冲击作用，大大提高桥梁的抗震能力。相邻承台之间用系梁连接使得其连成整体受力，整体刚度加强。
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| GB/T 7714 | 夏樟华 , 赖仕永 , 巩涛 et al. 一种无损控制的多柱式装配式墩结构体系 : CN202223053753.8[P]. | 2022-11-17 00:00:00 . |
| MLA | 夏樟华 et al. "一种无损控制的多柱式装配式墩结构体系" : CN202223053753.8. | 2022-11-17 00:00:00 . |
| APA | 夏樟华 , 赖仕永 , 巩涛 , 朱祖科 , 黄俤俤 , 林友勤 et al. 一种无损控制的多柱式装配式墩结构体系 : CN202223053753.8. | 2022-11-17 00:00:00 . |
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已建成的隔震建筑，其结构的动力特性不可调节且缺乏自适应的控制能力，进行现场结构的动力特性测试具有重要意义。现场测试2栋4层隔震教学楼，介绍了试验装置、方法步骤及所得结果，并与同非隔震结构进行数值对比，获得实际隔震结构响应规律和结构特性。测试首先用液压千斤顶使隔震层产生水平初位移(对应隔震支座剪应变超过100%),液压千斤顶瞬间卸载使建筑物做自由振动；最后进行测试和分析。结果表明：水平初位移条件下，隔震结构动力特性主要体现在一阶自振周期，其比非隔震结构延长，阻尼比增大；隔震层滞回曲线饱满；各楼层动力响应控制效果明显；隔震层具有瞬间复位特性。测试结果可为检验隔震结构的抗震性能提供重要参考。
Keyword ：
动力特性 动力特性 基础隔震 基础隔震 复位特性 复位特性 水平初位移 水平初位移 滞回特性 滞回特性
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| GB/T 7714 | 吴应雄 , 唐贞云 , 钟健 et al. 隔震结构现场动力特性测试 [J]. | 福建建设科技 , 2023 , 3 (01) : 40-42 . |
| MLA | 吴应雄 et al. "隔震结构现场动力特性测试" . | 福建建设科技 3 . 01 (2023) : 40-42 . |
| APA | 吴应雄 , 唐贞云 , 钟健 , 林友勤 , 吴炳添 , 邱灿星 et al. 隔震结构现场动力特性测试 . | 福建建设科技 , 2023 , 3 (01) , 40-42 . |
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There are a few isolated structures that have been subjected to seismic testing. An isolated structure is incapable of tracking, adjusting, and controlling its dynamic characteristics. As a result, field evaluations of solitary structures' dynamic characteristics are important. The horizontal initial displacement of a base isolation kindergarten made of 46 isolation bearings is 75 mm. The method for creating the horizontal initial displacement condition is illustrated, as are the primary test findings. Horizontal initial displacement is accomplished with the assistance of a reaction wall, rods, and hydraulic pump system. To begin, we removed the building using hydraulic jacks to produce horizontal displacement of the isolation layer and then attached rods to support the building. The rods were then shot and unloaded, causing the building to shake freely, and its dynamic response and other parameters were tested. The results indicate that the natural vibration period of an isolated structure is much greater than the natural vibration period of a seismic structure. The isolation layer's hysteretic curve as completely filled; upon unloading, the isolation layer as promptly reset; the dynamic response control effect of each was visible, but the top floor's acceleration was magnified by approximately 1.27 times.
Keyword ：
base isolation base isolation dynamic characteristic dynamic characteristic horizontal initial displacement horizontal initial displacement hysteretic characteristics hysteretic characteristics reset performance reset performance
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| GB/T 7714 | Wu, Ying-Xiong , Dong, Xin-Jun , Lin, You-Qin et al. Field Test for a Base Isolation Structure on Condition of Horizontal and Initial Displacement [J]. | APPLIED SCIENCES-BASEL , 2022 , 12 (1) . |
| MLA | Wu, Ying-Xiong et al. "Field Test for a Base Isolation Structure on Condition of Horizontal and Initial Displacement" . | APPLIED SCIENCES-BASEL 12 . 1 (2022) . |
| APA | Wu, Ying-Xiong , Dong, Xin-Jun , Lin, You-Qin , Cheng, Hao-De . Field Test for a Base Isolation Structure on Condition of Horizontal and Initial Displacement . | APPLIED SCIENCES-BASEL , 2022 , 12 (1) . |
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The prestressed cables used for external strengthening and the suspender cables used for arch bridges may suffer damage resulting from the corrosion or fracture of steel wires. Under these scenarios, the effective areas of the cables will decrease, but the cable forces will remain almost constant, which limits the ability to detect this damage with traditional frequency domain analysis. Due to the lack of understanding of the time and frequency domain characteristics, damage indexes and damage quantification for this kind of cable, hidden cable damage may not be detected in time, which can threaten bridge safety. To solve these problems, a series of performance experiments for prestressed cables were designed. The dynamic response signals of these cables to various damage levels, cable forces and cable lengths were obtained and analysed in the time domain, frequency domain and energy domain. Depending on the test, the change rate of wavelet packet total energy (RWE) was determined to be sensitive to cable damage and was chosen as the damage index for the cables. The damage level was quantified by a neural network algorithm with RWE, and a prediction procedure for cable damage was finally established. The damage detection method for external cables proposed in this paper will aid in the damage assessment and long-term monitoring of cable-supported bridges.
Keyword ：
Damage detection Damage detection External cable External cable Neural network algorithm Neural network algorithm Vibration signal Vibration signal Wavelet packet energy Wavelet packet energy
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| GB/T 7714 | Xia, Zhanghua , Lin, Youqin , Wang, Qi et al. Damage detection method for cables based on the change rate of wavelet packet total energy and a neural network [J]. | JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING , 2021 , 11 (3) : 593-608 . |
| MLA | Xia, Zhanghua et al. "Damage detection method for cables based on the change rate of wavelet packet total energy and a neural network" . | JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING 11 . 3 (2021) : 593-608 . |
| APA | Xia, Zhanghua , Lin, Youqin , Wang, Qi , Fan, Qian . Damage detection method for cables based on the change rate of wavelet packet total energy and a neural network . | JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING , 2021 , 11 (3) , 593-608 . |
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