Structural health monitoring and performance prediction are crucial for smart disaster mitigation and intelligent management of structures throughout their lifespan.Recent advancements in predictive maintenance strate...Structural health monitoring and performance prediction are crucial for smart disaster mitigation and intelligent management of structures throughout their lifespan.Recent advancements in predictive maintenance strategies within the industrial manufacturing industry have inspired similar innovations in civil engineering,aiming to improve structural performance evaluation,damage diagnosis,and capacity prediction.This review delves into the framework of predictive maintenance and examines various existing solutions,focusing on critical areas such as data acquisition,condition monitoring,damage prognosis,and maintenance planning.Results from real-world applications of predictive maintenance in civil engineering,covering high-rise structures,deep foundation pits,and other infrastructure,are presented.The challenges of implementing predictive maintenance in civil engineering structures under current technology,such as model interpretability of data-driven methods and standards for predictive maintenance,are explored.Future research prospects within this area are also discussed.展开更多
通过调谐质量阻尼器控制结构动力响应,改善高层建筑使用舒适度和服务功能品质,提升高层结构安全性能,已成为防灾减灾技术发展的重要趋势之一。考虑真实高层结构的复杂性与不确定性,对高层结构及其调谐质量阻尼器进行现场动力测试成为评...通过调谐质量阻尼器控制结构动力响应,改善高层建筑使用舒适度和服务功能品质,提升高层结构安全性能,已成为防灾减灾技术发展的重要趋势之一。考虑真实高层结构的复杂性与不确定性,对高层结构及其调谐质量阻尼器进行现场动力测试成为评价其减振/减震效果和结构性能评价的重要手段。基于已有的工程研究与实践,系统梳理国内外高层建筑采用调谐质量阻尼器(tuned mass damper, TMD)减振技术的应用现状,归纳国内外现有高层结构TMD动力激振试验类型及其监测物理量。利用“高层结构、调谐质量阻尼器”耦合系统动力模型,提出结构动力性能评价指标体系。同时展示了工程实例的TMD自由衰减试验与风振控制、主动质量阻尼器(active mass damper, AMD)固定频率与变频率强迫振动试验的典型动力评价结果。已有动力测试与评价结果表明,调谐质量阻尼器减振控制是一类有效且可靠的高层结构防灾减灾技术,TMD及AMD均具备优异的减振控制效果。展开更多
Detailed magnetostratigraphic and rock magnetic investigations on L8-S12 of the Songjiadian loess section in the Sanmenxia area,southernmost margin of the Chinese Loess Plateau were conducted in this study.Matuyama/Br...Detailed magnetostratigraphic and rock magnetic investigations on L8-S12 of the Songjiadian loess section in the Sanmenxia area,southernmost margin of the Chinese Loess Plateau were conducted in this study.Matuyama/Brunhes (M/B) boundary occurred at the bottom of the loess unit L8.The top and bottom boundaries of the Jaramillo polarity subchron are found in the middle of L10 and the bottom of L12,respectively.Magnetic fabric of the loess layers maintains the original depositional features and the recorded remanent magnetization analysis indicates little post-deposition disturbance experienced.In late Matuyama chron,two anomalies of geomagnetic field have been detected in L9.Our data demonstrated that these recorded anomalies were less likely a result of remagnetization,but more possibly the signature of geomagnetic excursions occurred,named SJD1 and SJD2.It is calculated that the midpoint ages of SJD1 and SJD2 are 0.917 Ma and 0.875 Ma,respectively,and the time-interval between the two events approximates 12 ka.Chronologically,SJD1 is close to the Santa Rosa (0.922 Ma) and SJD2 corresponds to the Kamikatsura (0.886 Ma) excursions.In consistence with previous studies,the geomagnetic field was weakened during these events.展开更多
基金The National Natural Science Foundation of China(No.52278312)the National Key Research and Development Program of China(No.2022YFC3801202)the Fundamental Research Funds for the Central Universities.
文摘Structural health monitoring and performance prediction are crucial for smart disaster mitigation and intelligent management of structures throughout their lifespan.Recent advancements in predictive maintenance strategies within the industrial manufacturing industry have inspired similar innovations in civil engineering,aiming to improve structural performance evaluation,damage diagnosis,and capacity prediction.This review delves into the framework of predictive maintenance and examines various existing solutions,focusing on critical areas such as data acquisition,condition monitoring,damage prognosis,and maintenance planning.Results from real-world applications of predictive maintenance in civil engineering,covering high-rise structures,deep foundation pits,and other infrastructure,are presented.The challenges of implementing predictive maintenance in civil engineering structures under current technology,such as model interpretability of data-driven methods and standards for predictive maintenance,are explored.Future research prospects within this area are also discussed.
文摘通过调谐质量阻尼器控制结构动力响应,改善高层建筑使用舒适度和服务功能品质,提升高层结构安全性能,已成为防灾减灾技术发展的重要趋势之一。考虑真实高层结构的复杂性与不确定性,对高层结构及其调谐质量阻尼器进行现场动力测试成为评价其减振/减震效果和结构性能评价的重要手段。基于已有的工程研究与实践,系统梳理国内外高层建筑采用调谐质量阻尼器(tuned mass damper, TMD)减振技术的应用现状,归纳国内外现有高层结构TMD动力激振试验类型及其监测物理量。利用“高层结构、调谐质量阻尼器”耦合系统动力模型,提出结构动力性能评价指标体系。同时展示了工程实例的TMD自由衰减试验与风振控制、主动质量阻尼器(active mass damper, AMD)固定频率与变频率强迫振动试验的典型动力评价结果。已有动力测试与评价结果表明,调谐质量阻尼器减振控制是一类有效且可靠的高层结构防灾减灾技术,TMD及AMD均具备优异的减振控制效果。
基金supported by the National Natural Science Foundation of China (Grant Nos.40672114 and 40872112)
文摘Detailed magnetostratigraphic and rock magnetic investigations on L8-S12 of the Songjiadian loess section in the Sanmenxia area,southernmost margin of the Chinese Loess Plateau were conducted in this study.Matuyama/Brunhes (M/B) boundary occurred at the bottom of the loess unit L8.The top and bottom boundaries of the Jaramillo polarity subchron are found in the middle of L10 and the bottom of L12,respectively.Magnetic fabric of the loess layers maintains the original depositional features and the recorded remanent magnetization analysis indicates little post-deposition disturbance experienced.In late Matuyama chron,two anomalies of geomagnetic field have been detected in L9.Our data demonstrated that these recorded anomalies were less likely a result of remagnetization,but more possibly the signature of geomagnetic excursions occurred,named SJD1 and SJD2.It is calculated that the midpoint ages of SJD1 and SJD2 are 0.917 Ma and 0.875 Ma,respectively,and the time-interval between the two events approximates 12 ka.Chronologically,SJD1 is close to the Santa Rosa (0.922 Ma) and SJD2 corresponds to the Kamikatsura (0.886 Ma) excursions.In consistence with previous studies,the geomagnetic field was weakened during these events.
