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Multi-hazard joint probability distribution model for wind speed,wind direction and rain intensity

Science China(Technological Sciences) 2023年第2期66卷 336-345页

作者： BI WenZhe TIAN Li LI Chao ZHANG SiYao School of Civil Engineering Shandong UniversityJinan 250061China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China

Multiple disasters such as strong wind and torrential rain pose great threats to civil ***,most existing studies ignored the dependence structure between them,as well as the effect of wind *** the dimension of the engineering sector,this paper introduces the vine copula to model the joint probability distribution(JPD)of wind speed,wind direction and rain intensity based on the field data in Yangjiang,China during 1971–***,the profiles of wind and rain in the studied area are statistically analyzed,and the original rainfall amounts are converted into short-term rain ***,the marginal distributions of individual variables and their pairwise dependence structures are built,followed by the development of the trivariate joint distribution *** results show that the constructed vine copula-based model can well characterize the dependence structure between wind speed,wind direction and rain ***,the JPD characteristics of wind speed and rain intensity show significant variations depending on wind direction,thus the effect of wind direction cannot be *** proposed JPD model will be conducive for reasonable and precise performance assessment of structures subjected to multiple hazards of wind and rain actions.

关键词： joint probability distribution wind speed rain intensity wind direction vine copulas directionality effects

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Effect of Water Absorption on the Mechanical Property and Failure Mechanism of Hollow Glass Microspheres Composite Epoxy Resin Solid Buoyancy Materials

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China Ocean engineering 2023年第5期37卷 876-884页

作者： DING Yue ZHAI Gang-jun MA Zhe WEI Zi-hao LI Xin State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China

To study the water absorption of hollow glass microspheres(HGMs)composite epoxy resin solid buoyancy materials in the marine environment and its effect on the mechanical properties,the water absorption was measured by immersing the material in distilled water for 36 days at ambient temperature and fitted to Fick’s second *** strength of materials before and after water absorption were tested by uniaxial experiments,and the effects of the filling ratio and water absorption on the mechanical properties of the materials were analyzed and ***,the failure modes and mechanism of the hollow glass microspheres composite material were explicated from the microscopic level by scanning electron microscope(SEM).This research will help solve the problems of solid buoyancy materials in ocean engineering applications.

关键词： solid buoyancy material water absorption mechanical property failure mechanism scanning electron microscope

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Estimation of the axial capacity of high-strength concrete-filled steel tube columns using artificial neural network,random forest,and extreme gradient boosting approaches

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Frontiers of Structural and Civil engineering 2024年第11期18卷 1794-1814页

作者： Payam SARIR Anat RUANGRASSAMEE Mitsuyasu IWANAMI Center of Excellence in Earthquake Engineering and Vibration Department of Civil EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok 10330Thailand Infrastructure Management Laboratory Department of Civil EngineeringTokyo Institute of TechnologyTokyo 152-8550Japan

The study aims to develop machine learning-based mechanisms that can accurately predict the axial capacity of high-strength concrete-filled steel tube(CFST)*** predicting the axial capacity of a CFST column is always challenging for *** artificial neural networks(ANNs),random forest(RF),and extreme gradient boosting(XG-Boost),a total of 165 experimental data sets were *** selected input parameters included the steel tensile strength,concrete compressive strength,tube diameter,tube thickness,and column *** results indicated that the ANN and RF demonstrated a coefficient of determination(R2)value of 0.965 and 0.952 during the training and 0.923 and 0.793 during the testing *** most effective technique was the XG-Boost due to its high efficiency,optimizing the gradient boosting,capturing complex patterns,and incorporating regularization to prevent *** outstanding R2 values of 0.991 and 0.946 during the training and testing were *** to flexibility in model hyperparameter tuning and customization options,the XG-Boost model demonstrated the lowest values of root mean square error and mean absolute error compared to the other *** to the findings,the diameter of CFST columns has the greatest impact on the output,while the column length has the least influence on the ultimate bearing capacity.

关键词： artificial neural network extreme gradient boosting random forest concrete-filled steel tube machine learning

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A Grid-based Framework for Managing Autonomous Vehicles' Movement at Intersections

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Periodica Polytechnica Transportation engineering 2024年第3期52卷 235-245页

作者： Ghadi, Maen Department of Civil and Infrastructure Engineering Faculty of Engineering and Technology Al-Zaytoonah University of Jordan St 594 Airport Rd. Amman11733 Jordan

With a full fleet of autonomous vehicles (AV) in the future, the concept of signal-free intersections has attracted transportation researchers. Multiple studies have investigated different methods and protocols to facilitate vehicle decision-making at intersections. Most of these methods have relied on strong centralized or inter-vehicle communications. This research aims to develop a new protocol for managing vehicle movement at four-leg intersections assuming a fully automated fleet. The main concept of the proposed protocol is to maintain a continuous movement of vehicles entering the intersection, without stopping in queues, by controlling their sequence of movements. In the methodology a dynamic occupancy grid (DOG) approach is applied by initially dividing the intersection into dynamic grids (i.e. cells). The cells are in a virtual movement, emanating away from each lane-group without overlapping, like a gear machine. Each vehicle sits on a specific cell to traverse the intersection safely at a predetermined time. In other words, vehicles approaching an intersection must register their speed and position by certain sensors, and in return receive the appropriate acceleration and speed to finally be allocated to the suitable moving grids. The efficiency of the applied protocol was demonstrated by a practical example that presented a higher intersection capacity value exceeding the ideal saturation flow rate in some cases. This reflects the efficiency of the implemented protocol and its applicability to different low to high traffic flows. Moreover, the protocol shows more flexibility in dealing with different weather, geometric and traffic conditions. © 2024 Budapest University of technology and Economics. All rights reserved.

关键词： Autonomous vehicles

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Evaluating effectiveness of multiple tuned mass dampers for vibration control of jacket offshore wind turbines under onshore and seafloor earthquakes

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Earthquake engineering and engineering Vibration 2023年第4期22卷 1045-1063页

作者： Pan Zuxing Liu Yingzhou Wang Wenhua Li Xin Zhao Shengxiao Jiang Zhenqiang Shang Jin Renewable Energy Engineering Institute Power China Huadong Engineering Corporation LimitedHangzhou 311122China State Key Laboratory of Coastal and Offshore Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China Institute of Earthquake Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China School of Civil Engineering and Architecture Guangxi University for NationalitiesNanning 530006China

The dynamic characteristics and structural responses of operation and grid loss offshore wind turbines(OWTs)under onshore and seafloor earthquakes are analyzed based on the established coupled seismic analysis *** addition to the remarkable influence of the rotor system on the responses of the operation OWT under earthquakes,interactions among the natural modes of the grid loss OWT in the fore-aft and side-to-side directions are *** comparing with the onshore earthquakes,the more significant differences of structural response are observed under the selected seafloor earthquakes,due to the longer duration and more abundant energy distribution around the natural frequencies of ***,a multiple tuned mass damper(MTMD)is designed and applied to the operation and grid loss ***,the comparisons of the mitigation effects under onshore and seafloor ground motions are carried out,and the necessity of applying seafloor ground motions to OWTs are ***,in comparison to the operation OWT,more effective reductions are observed for the grid loss OWT under onshore and seafloor earthquakes using the designed ***,the combined shutdown procedures and MTMD vibration control strategy is suggested for OWTs under earthquakes.

关键词： offshore wind turbine earthquake vibration control coupled analysis MTMD

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Parametric study on contact sensors for MASW measurement-based interfacial debonding detection for SCCS

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Earthquake engineering and engineering Vibration 2024年第2期23卷 331-344页

作者： Chen Hongbing Pang Xin Gan Shiyu Li Yuanyuan Gokarna Chalise Nie Xin Research Institute of Urbanization and Urban Safety School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Tsinghua UniversityBeijing 100084China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116081China

Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil *** the basis of the co-working ability of steel plate and concrete,the bonding status plays an essential role in guaranteeing the structural performance of ***,efficient non-destructive testing(NDT)on interfacial debondings in SCCS has become a prominent research ***-channel analysis of surface waves(MASW)has been validated as an effective NDT technique for interfacial debonding detection for ***,the feasibility of MASW must be validated using experimental *** study establishes a high-frequency data synchronous acquisition system with 32 channels to perform comparative verification experiments in ***,the current sensing approaches for high-frequency vibration and stress waves are ***,three types of contact sensors,namely,piezoelectric lead-zirconate-titanate(PZT)patches,accelerometers,and ultrasonic transducers,are selected for MASW ***,the selection and optimization of the force hammer head are *** experiments are carried out for the optimal selection of ultrasonic transducers,PZT patches,and accelerometers for MASW *** addition,the influence of different pasting methods on the output signal of the sensor array is *** results indicate that optimized PZT patches,acceleration sensors,and ultrasonic transducers can provide efficient data acquisition for MASW-based non-destructive *** research findings in this study lay a solid foundation for analyzing the recognition accuracy of contact MASW measurement using different sensor arrays.

关键词： steel-concrete composite structures(SCCS) interface debonding detection multi-channel analysis of surface waves(MASW) sensor selection comparative experimental study

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Application of noise-cancelling and smoothing techniques in road pavement vibration monitoring data

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International Journal of Transportation Science and technology 2024年第2期14卷 110-119页

作者： Amir Shtayat Sara Moridpour Berthold Best Hussein Daoud Department of Civil Engineering Faculty of EngineeringJadara UniversityIrbidJordan Civil and Infrastructure Engineering Discipline RMIT UniversityMelbourneAustralia Faculty of Civil Engineering Nuremberg Institute of TechnologyNurembergGermany Department of Mechanical Engineering National University College of TechnologyAmmanJordan

Road pavement surfaces need routine and regular monitoring and inspection to keep the surface layers in high-quality ***,the population growth and the increases in the number of vehicles and the length of road networks worldwide have required researchers to identify appropriate and accurate road pavement monitoring *** vibration-based technique is one of the effective techniques used to measure the condition of pavement degradation and the level of pavement *** consistency of pavement vibration data is directly proportional to the intensity of surface *** fluctuations in vibration signals indicate possible defects at certain points of road ***,vibration signals typically need a series of pre-processing techniques such as filtering,smoothing,segmentation,and labelling before being used in advanced processing and *** research reports the use of noise-cancelling and datasmoothing techniques,including high pass filter,moving average method,median,Savitzky-Golay filter,and extracting peak envelope method,to enhance raw vibration signals for further processing and *** results show significant variations in the impact of noise-cancelling and data-smoothing techniques on raw pavement vibration *** to the results,the high pass filter is a more accurate noise-cancelling and data smoothing technique on road pavement vibration data compared to other data filtering and data smoothing methods.

关键词： Noise-cancelling Smoothing Road pavement Degradation Vibration

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Research on Intelligent Detection technology for Highway and Bridge engineering

Research on Intelligent Detection Technology for Highway and...

引用

International Conference on Sustainable Traffic and Transportation engineering, CSTTE 2023

作者： Meng, Xiangyu Architecture and Civil Engineering Faculty of Infrastructure Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9789819758135

Bridges are a crucial component of infrastructure, and the detection of their structure and health status has always been a focus of attention in the engineering field. However, there are a series of challenges in the application of traditional bridge detection methods in complex environments, especially in fine detection of special areas, which usually only rely on manual visual inspection, which limits the ability to comprehensively understand the health status of bridges. In response to this issue, research and summary on intelligent detection technology and equipment for highway bridges indicate that timeliness and accuracy are key factors in the process of bridge health diagnosis, evaluation, and maintenance. In modern engineering practice, intelligent detection technology and equipment have been widely applied, and rapid development has made machine vision based detection technology the main means. This trend has brought significant improvements to bridge inspection, and the introduction of various non-destructive testing technologies has provided diversified data support for the inspection process, making the inspection results more comprehensive and reliable. High performance intelligent detection equipment has emerged in this context, with its ability to carry various advanced sensors gradually covering various bridge detection needs. © The Author(s) 2024.

关键词： Nondestructive examination

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Development and sensing performance study of a smart CFRP cable assembled by multi-group anchorage units

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International Journal of Smart and Nano Materials 2023年第3期14卷 286-302页

作者： Lian Shao Huanyu Yang Jinping Ou Zhi Zhou Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering Harbin Institute of TechnologyHarbinChina School of Civil Engineering and Architecture Hainan UniversityHaikouChina

Carbon fiber reinforced polymer(CFRP)can be applied for bridge cables due to its excellent *** the important load-bearing structural component,real-time force monitoring of the CFRP cable is *** paper presents a new smart CFRP cable that combines the self-sensing rods with embedded sensors and the anchorage system using extrusion *** embedding optical fiber(OF)and coaxial cable Fabry-Perot interferometer(CCFPI)into CFRP rods respectively,two types of self-sensing rods(CFRP-OF rod and CFRP-CCFPI rod)were fabricated.A new anchorage unit using an extrusion process was proposed as a basic component of smart CFRP *** units holding a CFRP-OF rod and a CFRP-CCFPI rod were tested to obtain their sensing and mechanical *** ancho-rage units were assembled to form a smart CFRP cable with self-sensing functionality.A verification test was carried out to confirm the capabil-ity of monitoring the cable *** test results demonstrate that the smart CFRP cable composed of multiple anchorage units has good potential in bridge engineering.

关键词： Carbon fiber reinforced polymer smart cable sensor extrusion process bridge engineering

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The Impact of Conflict Avoidance Strategies of Internal and External Container Trucks on the Traffic Scheduling in Automated Container Terminals 3

The Impact of Conflict Avoidance Strategies of Internal and ...

引用

3rd International Conference on Internet of Things and Smart City, IoTSC 2023

作者： Chen, Hao Xu, Xinglu Wang, Wenyuan Faculty of Infrastructure Engineering Dalian University of Technology Dalian China

ISBN: (纸本)9781510666375

The current automated container terminal frequently completely isolates the external and internal container trucks in space for the safety of the vehicles. Physical isolation needs more space for roads and will reduce yard space. Furthermore, when a traditional container terminal is upgraded to an automated container terminal with physical isolation, the plan layout needs to be changed dramatically with substantial investment. With the development of technology, unmanned container trucks are gradually enabled in automated container terminals. It is necessary to ensure traffic safety in the absence of physical isolation in the port. To address path conflicts that arise when internal unmanned and external container trucks are combined in traffic, this article focuses on the impact of internal unmanned and external container truck avoidance strategies on traffic scheduling in automated container terminals. A mathematical model is built in this paper and solved by a genetic algorithm to study the influence of two avoidance methods: Internal Unmanned Container Truck First and External Container Truck First. The study's findings indicate a correlation between avoidance strategy benefits and drawbacks and the proportion of internal unmanned trucks to external container trucks. © 2023 SPIE.

关键词： Genetic algorithms

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