Home / Advanced Search

  • Title/Keywords

  • Author/Affliations

  • Journal

  • Article Type

  • Start Year

  • End Year

Update SearchingClear
  • Articles
  • Online
Search Results (331)
  • Open Access

    ARTICLE

    Development of Features for Early Detection of Defects and Assessment of Bridge Decks

    Ahmed Silik1,2,7, Xiaodong Wang3, Chenyue Mei3, Xiaolei Jin3, Xudong Zhou4, Wei Zhou4, Congning Chen4, Weixing Hong1,2, Jiawei Li1,2, Mingjie Mao1,2, Yuhan Liu1,2, Mohammad Noori5,6,*, Wael A. Altabey8,*

    Structural Durability & Health Monitoring, Vol.17, No.4, pp. 257-281, 2023, DOI:10.32604/sdhm.2023.023617

    Abstract Damage detection is an important area with growing interest in mechanical and structural engineering. One of the critical issues in damage detection is how to determine indices sensitive to the structural damage and insensitive to the surrounding environmental variations. Current damage identification indices commonly focus on structural dynamic characteristics such as natural frequencies, mode shapes, and frequency responses. This study aimed at developing a technique based on energy Curvature Difference, power spectrum density, correlation-based index, load distribution factor, and neutral axis shift to assess the bridge deck condition. In addition to tracking energy and frequency More > Graphic Abstract

    Development of Features for Early Detection of Defects and Assessment of Bridge Decks

  • Open Access

    ARTICLE

    Weak Fault Detection of Rotor Winding Inter-Turn Short Circuit in Excitation System Based on Residual Interval Observer

    Gang Liu1, Xinqi Chen2,3,*, Lijuan Bao1, Linbo Xu2,3, Chaochao Dai1, Lei Yang2,3, Chengmin Wang4

    Structural Durability & Health Monitoring, Vol.17, No.4, pp. 337-351, 2023, DOI:10.32604/sdhm.2022.023583

    Abstract Aiming at the fact that the rotor winding inter-turn weak faults can hardly be detected due to the strong electromagnetic coupling effect in the excitation system, an interval observer based on current residual is designed. Firstly, the mechanism of the inter-turn short circuit of the rotor winding in the excitation system is modeled under the premise of stable working conditions, and electromagnetic decoupling and system simplification are carried out through Park Transform. An interval observer is designed based on the current residual in the two-phase coordinate system, and the sensitive and stable conditions of the… More >

  • Open Access

    ARTICLE

    Speed Measurement Feasibility by Eddy Current Effect in the High-Speed MFL Testing

    Zhaoting Liu1, Jianbo Wu1,*, Sha He2, Xin Rao3, Shiqiang Wang2, Shen Wang1, Wei Wei4

    Structural Durability & Health Monitoring, Vol.17, No.4, pp. 299-314, 2023, DOI:10.32604/sdhm.2023.022554

    Abstract It is known that eddy current effect has a great influence on magnetic flux leakage testing (MFL). Usually, contact-type encoder wheels are used to measure MFL testing speed to evaluate the effect and further compensate testing signals. This speed measurement method is complicated, and inevitable abrasion and occasional slippage will reduce the measurement accuracy. In order to solve this problem, based on eddy current effect due to the relative movement, a speed measurement method is proposed, which is contactless and simple. In the high-speed MFL testing, eddy current induced in the specimen will cause an More > Graphic Abstract

    Speed Measurement Feasibility by Eddy Current Effect in the High-Speed MFL Testing

  • Open Access

    ARTICLE

    Determination of Reflected Temperature in Active Thermography Measurements for Corrosion Quantification of Reinforced Concrete Elements

    Suyadi Kartorono*, Herlien Dwiarti Setio, Adang Surahman, Ediansjah Zulkifli

    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 195-208, 2023, DOI:10.32604/sdhm.2022.023259

    Abstract This paper sums up the determining analysis of the measuring location of Trefl using a thermocouple during the thermography tests. Laboratory temperature distribution testing methods, analysis of value and location of Trefl measurement are explained in this paper. The heat source is two halogen lamps of 500 watts each fitted at a distance of 30–50 cm. Noises appearing during testing of thermography are corrected with measured Trefl value. The results of thermogram correction of corroded concrete surfaces using Trefl values are displayed in this paper too. The concrete surface temperature results of quantitative image processing method are More >

  • Open Access

    ARTICLE

    Numerical Approach to Simulate the Effect of Corrosion Damage on the Natural Frequency of Reinforced Concrete Structures

    Amthal Hakim1, Wael Slika1,*, Rawan Machmouchi1, Adel Elkordi2

    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 175-194, 2023, DOI:10.32604/sdhm.2022.023027

    Abstract Corrosion of reinforcing steel in concrete elements causes minor to major damage in different aspects. It may lead to spalling of concrete cover, reduction of section’s capacity and can alter the dynamic properties. For the dynamic properties, natural frequency is to be a reliable indicator of structural integrity that can be utilized in non-destructive corrosion assessment. Although the correlation between natural frequency and corrosion damage has been reflected in different experimental programs, few attempts have been made to investigate this relationship in forward modeling and/or structural health monitoring techniques. This can be attributed to the… More >

  • Open Access

    REVIEW

    Research Progress on the Influence of Varying Fiber Contents on Mechanical Properties of Recycled Concrete

    Zhenqing Shi1, Guomin Sun1, Jianyong Pang2,*

    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 239-255, 2023, DOI:10.32604/sdhm.2023.022816

    Abstract Applying recycled concrete for engineered projects not only protects the ecological environment but also improves the utilization rate of waste concrete to satisfy sustainable development requirements. However, the mechanical properties of recycled concrete are not as good as those of ordinary concrete. To enhance the former’s performance and increase its popularity and application in engineering fields, notable advances have been made by using steel, synthetic, plant, and mineral fiber materials. These materials are added to recycled concrete to improve its mechanical properties. Studies have shown that (1) steel fibers have a distinct reinforcing effect and… More >

  • Open Access

    ARTICLE

    Effect of Freeze-Thaw Cycles on Chloride Transportation in Concrete: Prediction Model and Experiment

    Yongdong Yan*, Youdong Si, Chunhua Lu, Keke Wu

    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 225-238, 2023, DOI:10.32604/sdhm.2022.022629

    Abstract This research aims to investigate the effect of frost damage on chloride transportation mechanism in ordinary and fiber concrete with both theoretical and experimental methods. The proposed theoretical model takes into account the varying damage levels caused by concrete cover depth and freeze-thaw cycles, which are the two primary parameters affecting the expression of the chloride diffusion coefficient. In the experiment, three types of concrete were prepared: ordinary Portland concrete (OPC), polypropylene fiber concrete (PFC), and steel fiber concrete (SFC). These were then immersed in NaCl solution for 120 days after undergoing 10, 25, and… More >

  • Open Access

    ARTICLE

    Numerical Study on Mechanism of Blast-Induced Damage Considering Guiding Effect of Water Jet Slot

    Dengfeng Su1, Zizheng Jia1,*, Qiang Zhu1, Zhengguo Li1, Banghong Chen1, Dandan Zheng2

    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 209-224, 2023, DOI:10.32604/sdhm.2022.021257

    Abstract Damage is one of the most important characteristics of rock failure. Studying the damage mechanism of rock blasting under the guiding effect of the water jet slot and revealing the mechanism of controlled blasting with water jet assistance are crucial. In this study, a rock-like material was chosen as the research object for the calibration experiment of the numerical model. The numerical simulation models were then established by ANSYS/LS-DYNA, and the blast-induced damage mechanism under the guiding effect of the water jet slot was analyzed according to the blasting theory. The results indicated that explosive… More > Graphic Abstract

    Numerical Study on Mechanism of Blast-Induced Damage Considering Guiding Effect of Water Jet Slot

  • Open Access

    ARTICLE

    Response Spectrum Analysis of 7-story Assembled Frame Structure with Energy Dissipation System

    Jin Zhao, Yi Wang*, Zhengwei Ma

    Structural Durability & Health Monitoring, Vol.17, No.2, pp. 159-173, 2023, DOI:10.32604/sdhm.2023.09601

    Abstract Viscoelastic damper is an effective passive damping device, which can reduce the seismic response of the structure by increasing the damping and dissipating the vibration energy of structures. It has a wide application prospect in actual structural vibration control because of simple device and economical material. In view of the poor seismic behaviors of assembled frame structure connections, various energy dissipation devices are proposed to improve the seismic performance. The finite element numerical analysis method is adopted to analyze relevant energy dissipation structural parameters. The response spectrum of a 7-story assembled frame structure combined the… More >

  • Open Access

    ARTICLE

    Process Monitoring and Terminal Verification of Cable-Stayed Bridges with Corrugated Steel Webs under Contruction

    Kexin Zhang, Xinyuan Shen, Longsheng Bao, He Liu*

    Structural Durability & Health Monitoring, Vol.17, No.2, pp. 131-158, 2023, DOI:10.32604/sdhm.2023.023431

    Abstract In this paper, the construction process of a cable-stayed bridge with corrugated steel webs was monitored. Moreover, the end performance of the bridge was verified by load test. Owing to the consideration of the bridge structure safety, it is necessary to monitor the main girder deflection, stress, construction error and safety state during construction. Furthermore, to verify whether the bridge can meet the design requirements, the static and dynamic load tests are carried out after the completion of the bridge. The results of construction monitoring show that the stress state of the structure during construction… More >

Displaying 41-50 on page 5 of 331. Per Page