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检索条件"丛书名=Lecture Notes in Civil Engineering"

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Data-Based Assessment of the Resilience of Municipal Road Infrastructure as a Component of Sustainable Asset Management 20th

Data-Based Assessment of the Resilience of Municipal Road In...

引用

20th International Conference on Computing in civil and Building engineering-ICCCBE

作者： Buttgereit, Alexander Gomolluch, Stefan Gogolin, Daniel Reinhard, Uwe Tesic, Marko Jade Univ Appl Sci Ofener Str 16-19 D-26121 Oldenburg Germany City Munster Albersloher Weg 33 D-48155 Munster Germany Engn Co PTM Dortmund mbH Frische Luft 155 D-44319 Dortmund Germany Tech Univ Dresden Georg Schumann Str 7 D-01187 Dresden Germany

ISBN: (纸本)9783031842269;9783031842245;9783031842238

During administrative modernization and its working environment, there is an increasing need to further develop the Pavement Management System (PMS) into an Asset Management (AM) system and also to organize the operating or delivery phase, which is the longest phase in the life cycle of an asset, with the help of BIM methodology. At present, there is no scientifically based method for estimating the future condition and development of the structural substance of the road structure or the useful life of the municipal road network in Germany. However, knowledge of the expected service life or the remaining service life of the individual asphalt layers in the superstructure is essential for a sustainable and economical maintenance strategy as well as the derivation and implementation of suitable maintenance construction measures. For this reason, a research project has been initiated. By linking a wide variety of data and its own measurements, the "DaRkSeit" project aims to develop software that for the first time maps the condition of roads in real time, taking structural aspects into account. This is essentially based on existing traffic observation data (8 + 1 classification of vehicles) and available weather and climate data as well as material data from existing roads. To achieve the project objectives, it is necessary to supplement the data in the road information system. This includes the specification of axle load data (classification in up to 60 vehicle types), the temperature condition in the road structure of asphalt roads and model parameters to describe the material behavior of the asphalts used. As a result, a prototype of a software-based real-time tool for calculating the progress of degradation and estimating the remaining service life of asphalt roads is to be developed.

关键词： Asset Management digitalization sensor technology

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Prediction of Light Rail Transit Vibrations and Vibration-Reducing Measures 5th

Prediction of Light Rail Transit Vibrations and Vibration-Re...

引用

5th International Conference on Transportation Geotechnics

作者： Hosseinzadeh, Saeed Urkmez, Zeynep Merve Vink, Edo Heeres, Otto Schulz, Gerhard Maftei, George Arcadis NL-3812 GV Arcadis Netherlands

ISBN: (纸本)9789819782390;9789819782376;9789819782369

Light Rail Transit (LRT) is a sustainable transport solution. Rail-wheel interaction by LRT generates ground-borne vibration, affecting the buildings near railway tracks, especially in urban areas. This impact must be minimized to avoid any negative impact on the buildings and also on people living and working in the neighborhood. The rolling stock vibration creates waves propagating through the ground and into nearby buildings, generating ground-borne vibration effects. The soil structure interaction under these circumstances is significant for the railway routes that will pass by existing structures, especially those designed for non-dynamic conditions and constructed decades ago and historical buildings. This paper discusses vibration assessment for LRT operations and mitigation requirements for sensitive areas. Different vibration models were assessed for determining the potential vibration impact of LRT on surrounding receivers. The predictions are based on in-situ test measurements. Two different approaches to determine the vibration levels from LRT will be presented. It is concluded that the use of LRT in urban areas can be an effective solution, contributing to sustainable development.

关键词： LRT-Vibration Sustainability Measurements

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Subgrade Instability and Stiffness Degradation of Subgrade Soils Prone to Fluidisation 5th

Subgrade Instability and Stiffness Degradation of Subgrade S...

引用

5th International Conference on Transportation Geotechnics

作者： Singh, Mandeep Indraratna, Buddhima Rujikiatkamjorn, Cholachat Thanh Trung Nguyen FSG Geotech & Fdn Melbourne Vic 3067 Australia Univ Technol Sydney Transport Res Ctr Ultimo NSW 2007 Australia

ISBN: (纸本)9789819782314;9789819782291;9789819782284

This paper addresses the cyclic behaviour and stiffness degradation of subgrade soils subjected to stress-controlled cyclic loading, with particular emphasis on soils that are prone to mud pumping or subgrade instability. With continuous passage of trains over weak, saturated, low-plastic subgrade foundations, the finer fraction of the soils tends to fluidise (i.e., behave like a fluid) and migrate upwards, thereby, fouling the ballast and hindering the long-term performance of the rail track infrastructure. This leads to significant costs associated with annual track maintenance. Through a series of undrained cyclic triaxial testing varying the cyclic stress ratio (CSR, representing the axle loads) and loading frequency (simulating train speeds), the authors noted a significant upward migration of finer fraction coupled with internal moisture redistribution within the failed specimens. Further analysis revealed the instability of specimens was caused by early softening behaviour, and it is accompanied by a sharp reduction in the specimen stiffness. To tackle this, the stiffness was evaluated in terms of axial dynamic modulus and strain energy per cycle was evaluated to better understand the fluidisation behaviour. A novel quasi-linear relationship between threshold residual strain and number of cycles is proposed to serve as a practical guide.

关键词： Mud pumping Stiffness degradation Subgrade instability Undrained cyclic triaxial testing

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Influence of Urban Microclimate on the Energy Performance of Buildings of Complex Shapes in Different District Layouts and Climates 9th

Influence of Urban Microclimate on the Energy Performance of...

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9th International Building Physics Conference

作者： Borelli, Gregorio Battini, Federico Pernigotto, Giovanni Gasparella, Andrea Free Univ Bozen Bolzano Bolzano Italy

ISBN: (纸本)9789819783113;9789819783090;9789819783083

Urban Building Energy Modelling UBEM tools usually adopt conventional weather data that do not consider the impact of the urban context on the local climate conditions, e.g., the Urban Heat Island effect. In this study, the influence of the use of urban microclimate data on UBEM results was investigated considering a set of 5 synthetic district morphologies composed of buildings with complex shapes. Each base district, characterized by 2 envelope compositions and 2 window-to-wall ratios, was simulated in both heating- and cooling-dominated climates. Moreover, for each district scenario simulations were performed with EnergyPlus using both a standard rural weather file and a microclimatic one generated with the Urban Weather Generator tool. Results were compared in terms of annual district heating and cooling needs and peak loads. As a whole, the microclimatic weather files showed increased ambient temperatures, resulting in an overall reduction in heating needs and an increase in the cooling ones, supporting the need to include microclimate in UBEM calculations.

关键词： urban building energy modelling microclimate EnergyPlus urban heat island weather data

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The Influence of Friction Coefficient to the Nonlinear Dynamic Response of Multi-drum Columns 1

引用

5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Panagouli, Olympia Kafetsi, Maria Mistakidis, Euripidis Univ Thessaly Dept Civil Engn Lab Struct Anal & Design Volos 38334 Greece

ISBN: (数字)9783031873164

ISBN: (纸本)9783031873188;9783031873164;9783031873157

The earthquake response of columns constructed with drums, which are encountered in ancient historical monuments, is dominated by rocking, sliding, and wobbling. During strong ground shaking the large and heavy stone blocks oscillate about their corners, exhibiting a different way of dynamic response compared to conventional contemporary buildings. The overall physical problem involves multiple dynamic impacts with many different contact surfaces which change continuously, leading to a highly nonlinear dynamic problem..n this paper a 3D dynamic analysis of mult iota-drum columns is presented using the finite element method, in order to evaluate the effect of the friction coefficient on their response. The motivation for this study originates from the need to understand the role of the friction coefficient in both i) simple multi-drum columns and ii) multi-drum columns with iron dowels between the drums as they were installed in ancient times. For that, the 3D dynamic response of multi-drum columns, which are parts of the colonnade system of the Gymnasium in the Ancient Messene in Greece, is studied by using the FE code MARC. Both types of columns are subjected to sinusoidal base excitations with different characteristics by assuming different values of the friction coefficient at the interfaces. From the study useful conclusions are derived concerning the role of the friction coefficient to the overall stability of the two types of columns.

关键词： Multi-drum columns friction coefficient iron dowels rocking sliding nonlinear analysis

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A Machine Learning Model for Predicting the Shear Resistance of RC Beams Strengthened with EBR-CFRP Systems 4th

A Machine Learning Model for Predicting the Shear Resistance...

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4th FIB International Conference on Concrete Sustainability

作者： Mohammadi, Amirhossein Oliveira Barros, Joaquim Antonio Sena-Cruz, Jose Univ Minho Dept Civil Engn P-4800058 Guimaraes Portugal

ISBN: (纸本)9783031806742;9783031806728;9783031806711

The prediction of shear resistance in reinforced concrete (RC) beams, which are strengthened using externally bonded reinforcements (EBR), poses a significant challenge due to the complex nature of shear-resisting mechanisms and their complex interaction. Conventional models have been shown to have limited reliability and produce weak predictions. However, recent advancements in machine learning techniques and artificial intelligence have led to the development of several models in various studies that aim to predict the contribution of EBR-FRP to the shear resistance of RC beams. This study makes an attempt to enhance the predictive performance of the models by considering various factors. First, a comprehensive review is conducted on previous ML models, with a discussion on their strengths and weaknesses. The limitations of these models are addressed. Furthermore, potential approaches to improve the model predictive performance are discussed, and a new model is proposed.

关键词： Shear Strengthening Reinforced concrete beams Externally bonded reinforcements CFRP Machine learning XGBoost

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Numerical Calculation Study on the Temperature Evolution Law of Prestressed Pipeline Grouting Under Low Temperature Conditions 2nd

Numerical Calculation Study on the Temperature Evolution Law...

引用

2nd International Conference on Geosynthetics and Environmental engineering

作者： Gu, Kun Li, Lei Sun, Jingtao Liu, Hui Shi, Guoqing Jinan Yellow River Rd & Bridge Construct Grp Co L Jinan 250014 Peoples R China

ISBN: (纸本)9789819777686;9789819777662;9789819777655

This article conducts research on the feasibility and power selection of winter electric heating construction for prestressed pipeline grouting. A thermodynamic numerical calculation model for the hydration process of cement in prestressed corrugated pipes was constructed, and the temperature variation and spatial distribution in the pipeline under heating conditions in a low-temperature environment were studied. The relevant results provide data support for the winter construction of prestressed pipelines.

关键词： Low temperature conditions Prestressed pipes Temperature Cement hydration

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The Effect of Occupants' Relative Positions on Thermal Comfort and Cross-Infection Risk with Stratum Ventilation 9th

The Effect of Occupants' Relative Positions on Thermal Comfo...

引用

9th International Building Physics Conference

作者： Zhang, Chen Flou, Peter V. Nielsen Amalie Stovring Raudeberg, Emanda Spanggaard, Jonas Jensen, Marie Eske Ostergaard Jensen, Villiam Frandsen, Martin Aalborg Univ Dept Built Environm AC Meyers Vaenge 15 DK-2450 Copenhagen SV Denmark

ISBN: (纸本)9789819783199;9789819783175;9789819783168

Ventilation is an important measure in reducing cross-infection risk in the indoor environment. A novel ventilation concept, stratum ventilation, supplies fresh air directly to occupants' breathing levels and creates a horizontal airflow layer, which has potential to provide high ventilation effectiveness compared with traditional air distribution system. However, the effectiveness of such system is very sensitive to the operation conditions. This study examines how occupants' relative orientations and positions to inlet diffusers affect thermal comfort and cross-infection risks with stratum ventilation. Full-scale experiments in a test room involved life-size breathing thermal manikins representing source and target individuals. Results showed high draft risk at breathing zones was a drawback of such system. Cross-infection risks were sensitive to relative positions and orientations, with the worst scenario involving face-to-face occupants positioned in front of the inlet diffuser. The inlet air jet accelerated airborne transmission and maintained high concentrations in the close proximity.

关键词： Airborne transmission Stratum ventilation Cross-infection Thermal comfort Air distribution

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Revolutionizing Water Management: Digital Twins and AI for Predictive Maintenance and Sustainability 5th

Revolutionizing Water Management: Digital Twins and AI for P...

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5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Syed, Toqeer Ali Naqash, Muhammad Tayyab Siddiqui, Muhammad Shoaib Alqahtany, Saad Said Faizullah, Safiullah Formisano, Antonio Islamic Univ Madinah Fac Comp & Informat Syst Medina Saudi Arabia Islamic Univ Madinah Dept Civil Engn Fac Engn Medina Saudi Arabia Univ Naples Federico II Piazzale Tecchio 80 I-80125 Naples Italy

ISBN: (纸本)9783031873140;9783031873126;9783031873119

The innovative investigation integrates digital and physical water networks to improve their management and predictive capabilities. The used approach applies advanced sensors for detecting leaks and smart meters that monitor water usage, send alerts, usage data and visual information to a digital platform. At the heart of this framework is a digital twin, a virtual replica that continuously reflects the real-time state of the physical network by processing incoming sensor data. A multimodal transformer model is employed to integrate and analyze diverse data streams, including numerical and visual inputs, enabling highly accurate leakage detection, future water usage forecasting, and contextual insights with a prediction accuracy of about 98%. This approach advances water management and provides valuable insights for preserving historical buildings that demonstrates optimize operational efficiency and ensure sustainable water use in smart water networks.

关键词： water networks smart metering historical building leakage detection sensors

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Swelling Properties and Characteristics of BC Soil in Maharashtra Region

Swelling Properties and Characteristics of BC Soil in Mahara...

引用

2023 International Conference on Environmental Geotechnology, Recycled Waste Materials and Sustainable engineering

作者： Patil, L. S. Parkhe, D. D. Maharashtra Engn Res Inst WRD Govt Maharashtra Nasik Maharashtra India

ISBN: (纸本)9789819783953;9789819783939;9789819783922

Soil is made of rock after physical, chemical, and biological weathering and it is distributed in gravel, sand, silt, and clay. The formation of soil requires many years. Particles mostly 75 micron passing black cotton soil exhibit various characteristics such as liquid limit, plastic limit, plastic index density, specific gravity and swelling pressure. The nature of various property variations depends upon the clay mineral that was present in B.C. Soil. In Maharashtra, large amount of smectite group is present, in that 2:1 type of montmorillonite mineral has hydrous aluminosilicate with octahedral sheet which has large amount of swelling pressure property. This paper has to study the swelling properties and characteristics of B.C. soil by using analyses of the soil from various locations. As per available data of swelling pressure in Maharashtra of different types of engineering soil groups for Mechanical Analysis (Sieve), Atterberg limit, OMC. ODD properties under gravel, sand and clay swelling pressure changes depending upon the presence of silt and clay composition. There is a gradual increase in the swelling pressure as silt and clay percentages increase.

关键词： Mechanical analysis Optimum Dry Density (ODD) Optimum Moisture Content (OMC) Swelling pressure

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