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Prediction of Damping Capacity Demand in Seismic Base Isolators via Machine Learning

Computer Modeling in engineering & Sciences 2024年第3期138卷 2899-2924页

作者： Ayla Ocak Umit Isıkdag Gebrail Bekdas Sinan Melih Nigdeli Sanghun Kim ZongWoo Geem Department of civil engineering Istanbul University-CerrahpasaIstanbul34320Turkey Department of Informatics Mimar Sinan Fine Arts UniversityIstanbul34427Turkey Department of civil and environmental engineering Temple UniversityPhiladelphiaPA19122USA Department of Smart City Gachon UniversitySeongnam13120Korea

Base isolators used in buildings provide both a good acceleration reduction and structural vibration control *** base isolators may lose their damping capacity over time due to environmental or dynamic *** deterioration of them requires the determination of the maintenance and repair needs and is important for the long-termisolator *** this study,an artificial intelligence prediction model has been developed to determine the damage and maintenance-repair requirements of isolators as a result of environmental effects and dynamic factors over *** the developed model,the required damping capacity of the isolator structure was estimated and compared with the previously placed isolator capacity,and the decrease in the damping property was tried to be *** this purpose,a data set was created by collecting the behavior of structures with single degrees of freedom(SDOF),different stiffness,damping ratio and natural period isolated from the foundation under far fault *** data is divided into 5 different damping classes varying between 10%and 50%.Machine learning model was trained in damping classes with the data on the structure’s response to random seismic *** a result of the isolator behavior under randomly selected earthquakes,the recorded motion and structural acceleration of the structure against any seismic vibration were examined,and the decrease in the damping capacity was estimated on a class *** performance loss of the isolators,which are separated according to their damping properties,has been tried to be determined,and the reductions in the amounts to be taken into account have been determined by *** the developed prediction model,using various supervised machine learning classification algorithms,the classification algorithm providing the highest precision for the model has been *** the results are examined,it has been determined that the damping of the isolator structure with the

关键词： Vibration control base isolation machine learning damping capacity

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From ore to MOF: A case of MIL-100(Fe) production from iron ore concentrates

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Progress in Natural Science:Materials International 2024年第1期34卷 66-73页

作者： Miao Chang Chiyao Tang Chong-Chen Wang Chen Zhao Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

Within this work, iron ore concentrates instead of elemental iron Fe0and iron salts like Fe（NO3）3and FeCl3were selected as iron source to prepare MIL-100（Fe）(labeled as MIL-100（Fe）-ore). The corresponding synthesis cost is reduced to half of the MIL-100（Fe） produced from elemental iron and iron salts. As well, the unreacted iron ore concentrates can be easily separated from the as-prepared MIL-100（Fe）-ore by magnetic to facilitate the purification process, free of the strong acids to wash the residual iron. The as-obtained MIL-100（Fe）-ore with Langmuir surface area up to 2281.6 m2g-1displayed long-term chemical stability. Furthermore, the sorption capacity of MIL-100（Fe）-ore towards malachite green（MG） is up to 522.3 mg g-1at 25℃ and initial pH = 3.2, higher than that of MIL-100（Fe） yielded by conventional hydrothermal process. Finally, the production cost and life cycle assessment of MIL-100（Fe）-ore were compared with other traditional production procedures. The results revealed that our work greatly reduced the synthesis cost and enhanced the environmental sustainability.

关键词： Metal-organic framework Iron ore concentrates Adsorption Life cycle assessment

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Structural performance of flexible freeform panelssubjected to wind loads

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Frontiers of Structural and civil engineering 2024年第6期18卷 851-869页

作者： Yong YOO Zaryab SHAHID Renzhe CHEN Maria KOLIOU Anastasia MULIANA Negar KALANTAR Zachry Department of civil and environmental engineering Texas A&M UniversityCollege StationTX 77843USA J.Mike Walker'66 Department of Mechanical engineering Texas A&M UniversityCollege StationTX 77843USA Architecture Division California College of the ArtsSan FranciscoCA 94107USA

An increased number of hurricanes and tornadoes have been recorded worldwide in the last decade,while research efforts to reduce wind-related damage to structures become *** architecture,which focuses on generating complex curved shapes including streamlined shapes,has recently gained *** study focuses on investigating the potential of kerf panels,which have unique flexibility depending on the cut patterns and densities,to generate complex shapes for facades and their performance under wind *** investigate the kerf panel's potential capacity against wind loads,static and dynamic analyses were conducted for two kerf panel types with different cut densities and pre-deformed *** was observed that although solid panels result in smaller displacement amplitudes,stresses,and strains in some cases,the kerf panels allow for global and local cell deformations resulting in stress reduction in various locations with the potential to reduce damage due to overstress in *** the predeformed kerf panels,it was observed that both the overall stress and strain responses in kerf cut arrangements were lower than those of the flat-shaped *** study shows the promise of the use of kerf panels in achieving both design flexibility and performance demands when exposed to service *** that this newly proposed architectural configuration(design paradigm)for facades could revolutionize structural engineering by pushing complex freeform shapes to a standard practice that intertwines aesthetic arguments,building performance requirements,and material design considerations has the potential for significant practical applications.

关键词： freeform structure kerfing method wind load analysis cladding component

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Uncertainties of landslide susceptibility prediction:influences of different study area scales and mapping unit scales

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International Journal of Coal Science & Technology 2024年第2期11卷 143-172页

作者： Faming Huang Yu Cao Wenbin Li Filippo Catani Guquan Song Jinsong Huang Changshi Yu School of civil engineering and Architecture Nanchang UniversityNanchang 330031China Hebei International Joint Research Center for Remote Sensing of Agricultural Drought Monitoring/School of Land Science and Space Planning Hebei GEO UniversityShijiazhuang 050031China Department of Geosciences University of PadovaPaduaItaly Discipline of civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleCallaghanNSWAustralia School of Information engineering Nanchang UniversityNanchang 330031China

This study aims to investigate the effects of different mapping unit scales and study area scales on the uncertainty rules of landslide susceptibility prediction(LSP).To illustrate various study area scales,Ganzhou City in China,its eastern region(Ganzhou East),and Ruijin County in Ganzhou East were *** mapping unit scales are represented by grid units with spatial resolution of 30 and 60 m,as well as slope units that were extracted by multi-scale segmentation *** 3855 landslide locations and 21 typical environmental factors in Ganzhou City are first determined to create spatial datasets with ***,landslide susceptibility maps(LSMs)of Ganzhou City,Ganzhou East and Ruijin County are pro-duced using a support vector machine(SVM)and random forest(RF),*** LSMs of the above three regions are then extracted by mask from the LSM of Ganzhou City,along with the LSMs of Ruijin County from Ganzhou ***,LSMs of Ruijin at various mapping unit scales are generated in *** and landslide suscepti-bility indexes(LSIs)distribution are used to express LSP *** LSP uncertainties under grid units significantly decrease as study area scales decrease from Ganzhou City,Ganzhou East to Ruijin County,whereas those under slope units are less affected by study area *** course,attentions should also be paid to the broader representativeness of large study *** LSP accuracy of slope units increases by about 6%–10%compared with those under grid units with 30 m and 60 m resolution in the same study area's *** significance of environmental factors exhibits an averaging trend as study area scale increases from small to *** importance of environmental factors varies greatly with the 60 m grid unit,but it tends to be consistent to some extent in the 30 m grid unit and the slope unit.

关键词： Landslide susceptibility prediction Uncertainty analysis Study areas scales Mapping unit scales Slope units Random forest

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Modelling the water diversion of a sustainable cover system under humid climates

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Journal of Rock Mechanics and Geotechnical engineering 2024年第7期16卷 2429-2440页

作者： Haowen Guo Charles Wang Wai Ng Qi Zhang Chuanxiang Qu Liwen Hu Shenzhen Research Institute of Hong Kong University of Science and Technology Shenzhen518057China Department of civil and environmental engineering The Hong Kong University of Science and TechnologyHong Kong SAR999077China CCCC Fourth Harbor engineering Institute Co. LtdGuangzhou510230China

Extreme rainfall significantly threatens the safety of the landfill cover system,especially under humid *** study aims to provide design recommendations for a sustainable landfill cover system consisting of a low-permeability soil layer underlying a two-layer capillary barrier for humid ***,the numerical back-analysis was conducted for verification against a series of flume model ***,a parametric study was performed to investigate the effects of inclination angle,particle size and layer thickness on the lateral diversion length(DL)of the three-layer cover system under the 100-year return period rainfall of humid *** results show that the water lateral DL of the cover system can be greatly enhanced by increasing the inclination angle from 3°to 18°.Moreover,the bottom layer of the cover system with a coarser d10 was more susceptible to the impact of the heavy rainfall,while this can be alleviated by increasing the thickness of the bottom layer.A dimensionless number,defined as the ratio of thickness and d_(10) of the bottom layer,is proposed for designing lateral diversion of the three-layer cover system under humid *** preserve the maximum DL,it is suggested that the proposed dimensionless number should be larger than 95 and 110 for the design of rainfall events with 50-year and 100-year return periods for humid climates,respectively.

关键词： Unsaturated soil Recycling Construction waste Three-layer landfill cover Water infiltration

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Probing the Affinity of Coronavirus with Contact Surfaces in Simulated Body Fluids

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Environment & Health 2024年第5期2卷 269-277页

作者： Yarong Qi Xun Guan Yun Shen Xitong Liu Department of civil&environmental engineering The George Washington UniversityWashingtonD.C.20052United States Department of environmental Science Policyand ManagementUniversity of CaliforniaBerkeleyCalifornia 94720United States

Transmission of viral pathogens has raised serious public health concerns,but the affinity and strength of viruses adhering to hightouch surfaces are not *** systematically investigated the propensities of a coronavirus,Murine hepatitis virus A59(MHV),adhering onto and releasing from four representative contact surfaces,silica,stainless steel,cellulose,and polystyrene,in simulated saliva and urine using quartz crystal microbalance with dissipation monitoring(QCM-D).We also quantified the interactions between MHV and contact surfaces using atomic force microscopy(AFM).Both initial adhesion rates and saturated adhesion mass of MHV were higher in urine buffer than in saliva buffer,which is attributed to the higher repulsions between the virus and surfaces in the presence of *** maximum adhesion mass of MHV follows the order of stainless steel>silica>cellulose≈polystyrene in both urine and saliva *** steel and silica are surfaces with likely higher risks of virus contamination due to their highest maximum adhesion mass in both urine and saliva buffers and lower virus release percentages upon water *** results of this study will provide insights into risk assessment and control of pathogens associated with contact surfaces.

关键词： Coronavirus Contact surfaces Silica Stainless steel Cellulose Polystyrene Fomite transmission

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Emission and optical characteristics of brown carbon in size-segregated particles from three types of Chinese ships

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Journal of environmental Sciences 2024年第8期142卷 248-258页

作者： Fengqin Yang Fan Zhang Zeyu Liu Yingjun Chen Yan Zhang Can Wu Yali Lei Shijie Liu Binyu Xiao Xinyi Wan Yubao Chen Yong Han Min Cui Cheng Huang Gehui Wang Key Lab of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Institute of Eco-Chongming 20 Cuiniao Rd.ChongmingShanghai 202150China State environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex Shanghai Academy of Environmental SciencesShanghai 200233China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Department of civil and environmental engineering and State Key Laboratory of Marine Pollution The Hong Kong Polytechnic UniversityKowloon 100872Hong KongChina College of environmental Science and engineering Yangzhou UniversityYangzhou 225009China

Brown carbon(BrC)is one of the important light absorption substances that have high light absorption ability under short wavelength ***,limit studies have focused on the BrC emission from *** this study,size-segregated particulate matters(PM)were collected from three different types of ships,light absorption characteristics and size distribution of methanol-soluble BrC and water-soluble BrC in PM from ship exhausts were *** showed that four-stroke low-power diesel fishing boat(4-LDF)had the highest mass concentrations of methanol-soluble organic carbon(MSOC)and water-soluble organic carbon(WSOC),followed by 2-stroke high-power heavy-fuel-oil vessel(2-HHV),and fourstroke high-power marine-diesel vessel(4-HMV).While 2-HHV had obviously higher light absorption coefficients of methanol-soluble BrC(Abs365,M)and water-soluble BrC(Abs365,W)in unit weight of PM than the other two types of *** tested ships presented comparable or higher absorption efficiency of BrC in water extracts(MAE365,W)compared with other BrC emission *** of BrC was concentrated in fine particles,and the particle size distributions of both Abs365,Mand Abs365,Wshowed bimodal patterns,peaking at0.43–0.65μm and 4.7–5.8μm,***,different particle size distributions were found for MAE365,Mbetween diesel and heavy fuel oil ***,different wavelength dependence in particles with different size were also *** exhaust could be confirmed as a non-ignorable BrC emission source,and complex influencing factor could affect the light absorption characteristics of ship *** size should also be considered when light absorption ability of BrC was evaluated.

关键词： Ship emission Brown carbon Light absorption Size distribution

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Stripping of aggregate from mortar in waste concrete heated by microwave:Mechanisms of differential-temperature stress and vapor expansion pressure

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Journal of Traffic and Transportation engineering(English Edition) 2024年第3期11卷 538-558页

作者： Yanping Sheng Xiao Huan Peizhen Hu Liangliang Li Ahmed Abdulakeem Zhoujing Ye Linbing Wang Yanping Yin School of Materials Science and engineering Chang'an UniversityXi'an 710064China engineering Research Center of Transportation Materials Ministry of EducationChang'an UniversityXi'an 710064China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of environmental CivilAgricultural and Mechanical EngineeringCollege of EngineeringUniversity of GeorgiaAthensGA 30602USA

Microwave heating,which is used for pre-treatment of concrete before it is comminuted,stands as a strong candidate for selective liberation of multiphase materials like *** paper is concerned with the selective liberation of concrete's raw constituents(particularly aggregate)for recycling by considering the water content of concrete as a parameter of microwave heating for the first *** deterioration law of the concrete's performance was characterized by the variation in the splitting tensile strength and relative dynamic modulus after heating by microwave at different water ***,tests were conducted to evaluate the performance of the interface transition zone(ITZ)between aggregate and mortar as well as to investigate the reasons for the stripping behavior of aggregate-mortar,which included the interface tensile strength test,temperature measurement,and porosity *** deterioration law of splitting tensile strength and relative dynamic modulus revealed that the performance of concrete was subject to different degrees of damage depending on the water ***,experimental results showed that interface bonding strength between aggregate and mortar was dramatically impaired,and a large temperature difference was generated between the aggregate and mortar during microwave ***,the permeable pores increased considerably even when the specimens were *** the presence of water,the intactness of ITZ between aggregate and mortar was destroyed by microwave heating,and its performance was significantly lowered,which led to the occurrence of stripping behavior between aggregate and *** was reaffirmed by the microstructure presented by scanning electron ***,the newly developed microwave pretreatment improved by providing appropriate water contents for concrete corresponding to different strength grades is a promising method for recycling aggregate from waste concrete.

关键词： Waste concrete Recycled aggregate Microwave heating Stripping behavior Differential-temperature stress Vapor expansion pressure

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Special Issue on the Recent Trends of GeoAI Techniques for SDGs

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Journal of Geodesy and Geoinformation Science 2024年第1期7卷 1-2页

作者： FAN Hongchao MENG Liqiu CHENG Tao Department of civil and environmental engineering Norwegian University of Science and TechnologyTrondheim 7034Norway Chair of Cartography and Visual Analgtics TU MunichMunich 80333Germany SpaceTimeLab Department of CivilEnvironmental and Geomatic EngineeringUniversity College LondonLondon WCIE 6BTUK

Reliable and up-to-date geospatial data plays a fundamental role in Sustainable Development Goals(SDGs)*** to providing such geospa-tial data,numerous algorithms,solutions and frame-works have been developed in recent years.A mong oth-ers,A rtificial Intelligence(AI)based techniques have been widely used for the tasks of processing geospatial ***,this topic is blooming so fast and to a vast extent in the field of Geomatics that a new subdo-main seems to arise,namely GeoAI[1-2].Even for a very quick and brief glance inthe Internet,people can find a lot of applications,projects,blogs and research articles about GeoAI,w hereas new approaches to GeoAI have been proposed and tested.

关键词： Intelligence SDGs Sustainable

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Arsenic variation in soil layers in Bandung Regency,Indonesia:A statistical approach for identifying potential sources

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Emerging Contaminants 2024年第3期10卷 193-204页

作者： Nurul Fahimah Katharina Oginawati Indah Rachmatiah Siti Salami Dasapta Erwin Irawan Diyah Anggraeni Hirundini Rustica Absari Utriweni Mukhaiyar Udjianna Sekteria Pasaribu Kurnia Novita Sari Lira Adiyani environmental Management Technology Research Group Department of Environmental EngineeringFaculty of Civil and Environmental EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132West JavaIndonesia Department of Geological engineering Faculty of Earth Sciences and TechnologyInstitut Teknologi BandungJl.Ganesha 10Bandung40132West JavaIndonesia Department of environmental engineering Faculty of Civil and Environmental EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132West JavaIndonesia Statistics Expertise Group Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10Bandung40132West JavaIndonesia Technical Implementation Unit for Groundwater Ministry of Public Works and Housing of IndonesiaJl.Ir.H.Juanda No.193Bandung40135Indonesia

This research investigates the arsenic concentrations in 96 soil samples from a regency in Indonesia using a statistical *** samples were collected from three depth layers(topsoil[10e20 cm],subsoil[50e60 cm],and deep soil[90e100 cm]),with each layer consisting of 32 *** analysis using SPSS was employed to analyze potential arsenic sources based on the proximity of study locations to geothermal system areas,land use,distance from industry,and the presence of study locations on fault *** findings indicate that the potential source of arsenic contamination in the soil are suspected to be associated with geothermal system activities and the presence of soil samples on fault *** arsenic concentration in locations near to the geothermal system(5-10 km)was 45 times higher(OR=45,95%CI=45e362.57,ptopsoil>deep soil,whereas in residential soil,it was subsoil>deep soil>*** arsenic concentration variation at near distances from industrial areas was topsoil>subsoil>deep soil,contrasting with medium to far distances from industry(subsoil>deep soil>topsoil).Therefore,these findings can be utilized to prioritize remediation efforts and provide input for future research on arsenic contamination in the region.

关键词： Anthropogenic sources Arsenic sources Indonesian soil Natural sources

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