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

共 6935 条记录，以下是371-380 订阅

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Small Strain Behaviour of Compacted Soils in Transport Infrastructure Formations Subjected to Drying and Wetting 5th

Small Strain Behaviour of Compacted Soils in Transport Infra...

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5th International Conference on Transportation Geotechnics

作者： Walker, Christopher Heitor, Ana Clarke, Barry Univ Leeds Leeds W Yorkshire England

ISBN: (纸本)9789819782314;9789819782291;9789819782284

Transport infrastructure is linear and often intersects and is comprised of (i.e. geostructures) several soils of differing characteristics i.e. particle size, mineralogy and thus plasticity. Evaluation of these properties, for example by monitoring small strain stiffness, is critical for assessing compacted soil geomechanical behaviour during service. In this paper the influence of drying-wetting is investigated for three compacted soils representative of soils in the UK, including a low plasticity clayey sandy silt, a high plasticity kaolin clay, and a very high plasticity silty clay. The impact of their composition (e.g. clay content and plasticity) on shear wave velocity during a drying-wetting cycle was monitored at selected gravimetric water content levels. As expected, the results show that higher clay activity (A) results in larger variation of shear wave velocity. In addition, soils with a higher Weighted Plastic Index (WPI) also exhibit larger volumetric changes during drying-wetting. Consequently, the results quantitatively capture the influence of the clay content, which shows a significant effect on the variation in seasonal geomechanical performance. These findings can in turn support proactive asset management strategies that enable the identification of areas of the transport network that may be more vulnerable to seasonal changes in water content.

关键词： Drying-wetting cycle Small strain stiffness Compacted soils

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Life Cycle Impact Analysis of Different Intervention Scenarios for Regenerating the Existing Building Heritage. The Case Study of the New "Borgo Digani" in Argelato, Bologna 11th

Life Cycle Impact Analysis of Different Intervention Scenari...

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11th International Conference of Ar.Tec.

作者： Mazzoli, Cecilia Benedetti, Anna Chiara Costantino, Carlo Ferrante, Annarita Univ Bologna Dept Architecture Bologna Italy Univ Tuscia Dept Agr & Forest Sci Viterbo Italy

ISBN: (纸本)9783031718694;9783031718670;9783031718663

This paper aims to compare different intervention scenarios for the regeneration of the existing building stock based on two opposite paradigms: deep renovation and demolition and reconstruction. In the second case, three different construction technologies for the structure of the new building were investigated, respecting the original volumetric and architectural characteristics: wood, reinforced concrete, and steel. The comparison between the different solutions sought to highlight the potential and criticalities of the two different approaches, with particular attention to aspects related to environmental sustainability. This investigation was carried out on a manor villa built at the beginning of the 1990s, belonging to the "Borgo Digani" complex located in Argelato (Bologna), selected as a pilot case by the European project "DRIVE 0", financed within the Horizon 2020 programme, aiming at promoting the decarbonisation of the existing built heritage. The analysis was carried out by imposing certain fixed conditions for all scenarios: the external shape of the building, the thermal performance of the envelope walls (equal to 0.18 +/- 0.02 W/m(2)K), and the use of the same thermal insulation material for energy efficiency. Analyses of the energy performance of the different technologies adopted and the different building envelope solutions selected were addressed with Edilclima software. The assessments of the environmental impact of the various interventions, on the other hand, were carried out through a simplified Life Cycle Assessment (LCA) on the whole life cycle of the building, using One Click LCA software. The results of the analyses, expressed in terms of embodied energy and embodied carbon, showed how the final values are highly influenced by the imposed boundary conditions and how crucial it is to interpret critically the data resulting from the calculations carried out, which also consider the expected performance.

关键词： Deep Renovation Demolition with Reconstruction Circularity Environmental Impact Life Cycle Assessment (LCA)

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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...

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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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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...

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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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Swelling Properties and Characteristics of BC Soil in Maharashtra Region

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

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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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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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Spatial Distribution of Wind Driving Rain and Drying on Facades and Associated Hygrothermal Response 9th

Spatial Distribution of Wind Driving Rain and Drying on Faca...

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9th International Building Physics Conference

作者： Bruno, Vanderschelden Aytac, Kubilay Veerle, Cnudde Tim, De Kock Nathan, Van den Bossche Univ Ghent Ghent Belgium Univ Antwerp Antwerp Belgium Swiss Fed Inst Technol Chair Bldg Phys Zurich Switzerland Univ Utrecht Utrecht Netherlands

ISBN: (纸本)9789819783076;9789819783052;9789819783045

Heat Air Moisture (HAM) transfer models have proven their added value in the renovation and restauration sector. These models allow to analyse the causes of moisture problems and the impact of renovation measures. Wind-driven rain (WDR) is one of the most important moisture sources, affecting the hygrothermal performance and durability of building components. In the traditional approach of HAM-modelling, the WDR and the convective heat transfer coefficient (CHTC) are implemented in a simplified manner, i.e., typically a generic value for one location is taken constant over the facade. However, WDR has a spatially and temporally discrete modus and the CHTC value varies highly across the windward facade. Therefore, the reliability of the traditional approach for hygrothermal response behaviour can be questioned. Within this paper, the spatial distribution of the catch ratio and CTHC are implemented in a response behaviour study. Steady Reynolds-average Navier-Stokes (RANS) equations and Eulerian multiphase CFD-simulations are performed for the CHTC and WDR, including the turbulent dispersion of raindrops. The approach is tested for a cubic lowrise building and the effect of the spatial parameter is analysed for frost damage because this is of particular interest for decision frameworks for interior insulation strategies. The results show that critical rain loads are typically underestimated in practice. Next to that, the specific combination of rain loads and drying patterns entail unexpected freeze-thaw patterns.

关键词： Hygrothermal response wetting drying wind-driven rain Convective transfer coefficients

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The Use of Micropiles in an A-Frame Arrangement to Stabilize Dalrymple Road on the Eungella Range, Mackay, Queensland Australia 5th

The Use of Micropiles in an A-Frame Arrangement to Stabilize...

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5th International Conference on Transportation Geotechnics

作者： Ezeajugh, Lambert E. Ground Environm Pty Ltd Mackay Australia

ISBN: (纸本)9789819782437;9789819782413;9789819782406

This paper details the investigation, design, construction, and monitoring processes performed in the employment of a micropile solution to restore a failed section of Mackay Regional Council's Dalrymple Road, located near the township of Eungella. The road asset was restored using micropile in an A-Frame arrangement. The restored site comprised a 140 m long section of Dalrymple Road where unstable upper soils of colluvial origin were encountered at depths of up to 7m within the road corridor restoration extents. The road had collapsed in late January/early February of 2019 following the area experiencing a week of inclement weather with rainfalls in the order of 970 mm. Queensland Transport and Main Roads (TMR) have been historically cautious in the use of small diameter piles (micropiles) as a piled support option for managing stability issues associated with their road assets. Caution is advisable where deep seated failures are involved, as micropiles may not be well suited to mobilize the large resisting forces required to ensure stability, or where there is potential for loss of material downslope on the passive side of a micropile remediated site, in which case the effectiveness of a micropile solution is lessened due to their small diameter. Concerns regarding the use of micropiles in such situations are overcome through rigorous investigation, design, and construction processes. During construction, the site was instrumented for long-term performance monitoring purposes. Monitoring commenced in 2020 following the completion of construction works and is continuing annually. Monitoring carried out following about a 1000 mm of rainfall in the week of January 2023 indicated a total cumulative lateral displacement in the order of 10-15 mm.

关键词： Slope remediation Micropile in a-frame arrangement Dalrymple road Mackay

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Counterbalancing the Impact of Urban Overheating Using Cool Materials 11th

Counterbalancing the Impact of Urban Overheating Using Cool ...

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11th International Conference of Ar.Tec.

作者： Santamouris, Mattheos Vasilakopoulou, Konstantina Univ New South Wales Sch Built Environm Fac Arts Design & Architecture Sydney NSW Australia

ISBN: (纸本)9783031718656;9783031718632;9783031718625

Urban overheating is the most documented phenomenon of climatic change seriously affecting human life. Numerous mitigation technologies have been developed and implemented contributing to important temperature decrease in cities. Among them, the development of cool and super cool materials seems to be the most powerful presenting the highest cooling potential. The present article aims to discuss the main impacts of urban overheating on humans, as well as the recent progress related to the development of cool and super cool materials for urban mitigation purposes.

关键词： Urban overheating Climate change Mitigation technologies Cool materials

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