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

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Study of Concrete Shear Design for Wind Turbine Support Structures 4th

Study of Concrete Shear Design for Wind Turbine Support Stru...

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4th FIB International Conference on Concrete Sustainability

作者： Andersen, Morten Sogaard Konggard-Andersen, Nikolaj DNV Denmark AS Renewables Certificat Hellerup Denmark

ISBN: (纸本)9783031806742;9783031806728;9783031806711

When developing wind energy projects, concrete is sometimes used for support structures in ways which are uncommon to other industries. This can lead to the use of known design methods with input parameters outside the range for which the methods have been developed. The challenge with the applicability of the design methods is apparent when comparing the variations in results from the different methods. Design methods for shear capacity in structures without shear reinforcement are known to lead to quite different results in structural details common for wind turbine structures. This is the case e.g. for structural elements subjected to high compressive normal forces, for elements of high-strength concretes, and for elements with large thicknesses. The focus of this paper is the design methods' sensitivity to high compressive normal forces, which is relevant for e.g. concrete structures for floating wind turbines. However, sensitivity to the other two mentioned design parameters is also evaluated, i.e. high-strength concretes (relevant for e.g. many concrete wind turbine towers) and large thicknesses (relevant for e.g. concrete slab foundations for onshore wind turbines). Differences between several shear design methods are investigated, and comparison calculations are performed to quantify the differences, and the results are presented in this paper. The long-term goal is to identify the design method which most accurately describes the shear capacity, even for more extreme values of the design input parameter. This is in order to potentially calibrate safety factors relevant to wind turbine structures and thereby optimize these designs. Future studies to reach this goal are also discussed.

关键词： Wind turbine support structures Floating structures Shear design No shear reinforcement High compressive normal forces High-strength concrete Large concrete slabs

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Performance-Driven Design of a Residential Unit with the Use of Genetic Algorithms 11th

Performance-Driven Design of a Residential Unit with the Use...

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11th International Conference of Ar.Tec.

作者： Guardigli, Luca Prati, Davide Namvar, Nima Univ Bologna DA I-40100 Bologna Italy Univ Bergamo DISA I-24044 Dalmine BG Italy

ISBN: (纸本)9783031718694;9783031718670;9783031718663

This study examines and integrates the principles of multi-objective optimization, space syntax, and graph analysis in the context of Artificial Intelligence (AI) applications for architecture and construction, particularly automated space planning. The primary purpose of the study is to determine the efficacy of various advanced strategies for generating a wide range of design options. Building codes, customer requirements, and other architectural constraints must be addressed while developing optimal solutions. After selecting the parameters to deal with, the process aims to thoroughly study design possibilities while balancing features in competing positions. The process adopts space syntax and graph analysis to visually represent the functional connections between various spaces and users' movements within the building. The analyses are carried out within the Grasshopper platform using the Wallacei and Termite Nest plug-ins. Wallacei employs multi-objective evolutionary optimization methods to tackle conflicting design issues, whereas Termite Nest develops design possibilities combining space syntax and graph analysis. This study aims to demonstrate the limitations and the potential of computerized architectural space planning by showing how these advanced algorithms can generate optimized design solutions that meet particular requirements.

关键词： Genetic Algorithms Performance-driven Design Space Syntax Multi-objective Optimization Space Planning

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An Improved Design Wave Analysis Method for Offshore Floating Truss Platform 11th

An Improved Design Wave Analysis Method for Offshore Floatin...

引用

11th International Conference on Coastal and Ocean engineering

作者： Yu, Boqian Ling, Aijun Tianjin TEDA CCS Offshore Engn Technol Ctr Tianjin 300457 Peoples R China

ISBN: (纸本)9789819601837;9789819601813;9789819601806

In recent years, a large number of floating platforms similar to semi-submersible platforms but using a large number of medium-sized components for frame support have appeared in offshore engineering. Such platforms are used in floating wind power, Marine aquaculture platforms, sightseeing and tourism platforms. Design wave analysis is required for conventional offshore floating platform, but the traditional design wave analysis method is not fully applicable to trussed platform due to the large differences in structural forms. In order to accurately evaluate structural safety, traditional design wave analysis will lead to too many calculation conditions and too optimistic calculation results. In this paper, an improved design wave analysis method is proposed to solve the structural design problem of floating truss platform in the ocean, and the technical route of this method is summarized.

关键词： Trussed platform floating platform design wave analysis method improved design wave analysis method

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Constructability of Segmental Concrete Masonry Tall Walls

Constructability of Segmental Concrete Masonry Tall Walls

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2023 Canadian Society for civil engineering Annual Conference

作者： Elsayed, Mahmoud Alonso-Rivers, Alan Gonzalez, Rafael Adeeb, Samer Tomlinson, Douglas Cruz-Noguez, Carlos Univ Alberta Edmonton AB T6G 2R3 Canada

ISBN: (纸本)9783031615375;9783031615351;9783031615344

Tall loadbearing masonry walls are part of the main structural system used in warehouses and industrial facilities. These buildings feature exterior walls ranging from 4 to 9 m in height. Construction of such walls requires special considerations, such as using scaffolds and extra mason efforts to lay blocks around bar splices. Current construction methods create uncomfortable environments for masons, increasing the risk of injuries and time construction while reducing productivity. This paper introduces a new construction method that enhances the constructability of tall masonry walls and reduces the difficulties associated with traditional construction methods. Five reinforced masonry modular panels-eight courses high- were built using 20 cm concrete masonry units to form a full-scale 9 m tall masonry wall. These panels were assembled on top of each other while ensuring mild rebar continuity using mechanical couplers. Post-tensioning threaded bars were also used to ensure wall integrity and enhance wall performance under out-of-plane loads. The experimental results showed good performance of the new wall system while the effect of post-tensioning force and the base condition on the wall performance is discussed.

关键词： Offsite construction Concrete masonry walls Post-tensioning Full-scale test

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Smart Materials in Construction Sector Decarbonisation: Few-Layer Graphene Based Radiant Heating 11th

Smart Materials in Construction Sector Decarbonisation: Few-...

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11th International Conference of Ar.Tec.

作者： Polverino, Salvatore Bellani, Sebastiano Castillo, Antonio Esau Del Rio Gabbatel, Luca Lazzari, Stefano Zappia, Marilena Isabella Bonaccorso, Francesco Morbiducci, Renata Univ Genoa I-16123 Genoa Italy BeDimensional SpA I-16163 Genoa Italy Fdn Ist Italiano Tecnol I-16163 Genoa Italy

ISBN: (纸本)9783031718656;9783031718632;9783031718625

In the current era, the European Union is significantly transitioning towards reducing its carbon footprint, specifically by moving away from fossil fuel-based energy sources within its economic framework. This shift, particularly pronounced within the construction industry, is motivated by environmental, economic, and geopolitical issues. A key strategy in this energy transition involves the performance improvement and modernisation of heating systems to diminish reliance on natural gas. Within the realm of radiant heating solutions, innovative smart materials are being explored for their ability to convert electrical energy into thermal one through the Joule heating effect (e.g., self-heating materials). This study focuses on the development of electrically conductive self-heating coatings incorporating pristine few-layer graphene (FLG) as the active component. These coatings, formulated with an acrylic-based binder in a water-based dispersion, demonstrate low electrical resistivity, reaching 0.026 Omega cm. Biasing 12 V DC, the FLG-based coating can achieve a surface temperature of 115 degrees C in 15 min. Furthermore, the research introduces a novel electric heating panel designed to attain an operational surface temperature of 35 degrees C within an hour using extra-low-voltage (24 V DC). The system also considers the integration of Phase Change Materials to sustain an optimal surface temperature for extended heating applications.

关键词： Electric Heating System Few-Layer Graphene Smart Materials System Construction Sector Decarbonisation Innovative Building Techniques

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Effect of Wind on the Thermal Performance of a Building Envelope in Cold Climate 9th

Effect of Wind on the Thermal Performance of a Building Enve...

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9th International Building Physics Conference

作者： Jafri, Ahmed Villeneuve, Eric Agelin-Chaab, Martin Hangan, Horia Ontario Tech Univ Oshawa ON L1G 0C5 Canada

ISBN: (纸本)9789819783113;9789819783090;9789819783083

The primary goal of this research is to investigate the effect of wind speed and direction on the thermal performance of a building envelope in a cold climate with temperatures of -10 degrees C and -25 degrees C. This is achieved by using an air-source heat pump to maintain the inside temperature of the building envelope constant at 25 degrees C and monitoring its power consumption in a full-scale climatic wind tunnel. In addition, the wind velocities close to the walls of the building are measured and used to estimate the convective heat transfer coefficient (CHTC). The inflow wind speeds are preset at 5 m/s and 10 m/s and subsequently measured at 15 cm away from the buildingwalls to estimate theCHTCbased on theReynolds number and Nusselt number. Furthermore, relationships between the CHTC and wind velocities are established, allowing the development of proposed CHTC prediction models based on experimental data.

关键词： Convective heat transfer coefficient Energy Balance Building envelope Heat transfer coefficient

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Geotechnical Challenges for Fast-Track Design and Construction of a Bridge Foundation in an Area Identified as Having Potential for Liquefaction and High Groundwater 5th

Geotechnical Challenges for Fast-Track Design and Constructi...

引用

5th International Conference on Transportation Geotechnics

作者： Balachandran, Somalingam Kulikowski, Joseph J. Liu, Shuyu GENTERRA Consultants Inc Geotech Engn Dept Irvine CA 92618 USA

ISBN: (纸本)9789819782192;9789819782178;9789819782161

The paper presents an overview, from the geotechnical engineering perspective, of a challenging recent bridge project in Corona, California. This paper covers the following key issues: (1) project requirements, (2) site conditions and constraints associated with the geotechnical exploration program, (3) geologic-seismic hazards, (4) preliminary level geotechnical investigation to develop foundation design recommendations to complete the 100% level plans and specifications for bidding, (5) geotechnical challenges to develop foundation design recommendations, (6) writing specifications that would minimize the potential for change orders during construction, (7) final level geotechnical investigation to justify or confirm assumptions that were made during the preparation of the 100% level design package, and (8) Oscillator Casing methodology and associated construction challenges during the construction of the Cast-In-Drilled-Hole Piles for the bridge foundation.

关键词： Liquefaction potential Cast-in-Drilled-Hole Piles Oscillator casing

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Performance Analysis of a Steel Exoskeleton with Double Skin Facade for Energy and Structural Retrofit of Existing '70s-'80s Buildings 11th

Performance Analysis of a Steel Exoskeleton with Double Skin...

引用

11th International Conference of Ar.Tec.

作者： Nobile, Giovanni Carlucci, Francesco Fiorito, Francesco Polytech Univ Bari Dept Civil Environm Land Bldg Engn & Chem Bari Italy

ISBN: (纸本)9783031718694;9783031718670;9783031718663

In current climatic and social context, energy retrofit of existing buildings plays a really important role thanks to the considerable economic and CO2 savings connected to the lower building energy demand. This study fits perfectly into this context and aims to evaluate the effects of an energy and structural retrofit intervention on an existing building representative of the pre-1980s Italian period by means of a steel reticular exoskeleton. This exoskeleton was designed in order to improve the dynamic response of the existing structure and to realize a new high-performance double-skin unitized facade. The new facade, designed taking into account fundamental geometrical criteria, creates a floor-by-floor air volume, used as a greenhouse in winter and as a ventilated cavity during summer. Furthermore, the choice of low-emissivity performance glass for the wide glazed surfaces allows to reduce the heat losses during winter, reducing the overall energy demand. During summer, on the other hand, the activation of solar-controlled automated venetian blinds, combined with the control of natural ventilation, allows a significant reduction of the cooling demand. The transition from winter to summer mode is guaranteed thanks to a dedicated schedule that allows the control of solar radiation and natural ventilation from May to September. From a performance point of view, thanks to the control and optimization of the natural ventilation and incident solar radiation in the double skin cavity, the overall energy consumption of the existing building can be reduced by more than half. In conclusion, this study highlights how the proper design of an exoskeleton allows to both improve structural and energy behaviour;in particular, using the exoskeleton to create a glazed double skin facade, significant savings can be achieved, making existing buildings less energy-intensive.

关键词： Energy retrofit architectural engineering sustainability exoskeleton double skin facade

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A Critical Review on the Utilization of Fly Ash in the Production of Bricks

A Critical Review on the Utilization of Fly Ash in the Produ...

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

作者： Singh, Sher Bahadur Maiti, Pabitra Ranjan Mohanty, Supriya Indian Inst Technol BHU Varanasi Dept Civil Engn Varanasi 221005 Uttar Pradesh India

ISBN: (纸本)9789819797790;9789819797776;9789819797769

The increasing demand of power supply worldwide requires setting up of more and more thermal power plants. But the wastes produced from these power plants are posing major challenges of their disposal. One such residue is fly ash, which is posing major difficulty in the form of accumulation which requires a huge land area for their disposal. For environmental safety and sustainable growth, extensive studies are being carried out on better consumption of fly ash for production of different construction materials like mortar, concrete, brick or blocks, etc. This study is an up-to-date review of earlier studies on use of fly ash in brick making which can be used for construction purposes. Bricks produced using cement/lime as binder and geopolymer technique have been considered. Compressive strength of the fly ash-based bricks produced by different researchers was studied. Durability properties including water absorption and efflorescence have also been discussed. It is found that the highest compressive strength of 27MPa is achieved when class C fly ash, sand and 10 mm aggregate are used with cement as binder. Water absorption as low as 34% with slight efflorescence is found when bricks are produced using casting pressure with cement/lime as binder. In case of geopolymer bricks, the highest compressive strength of 70 MPa is obtained when 12 M sodium hydroxide is used followed by temperature curing of 60 degrees C for 24 h. The lowest water absorption of bricks developed by geopolymerization is found to be 3.5% when fly ash and highly alkaline activator without any filler material are used.

关键词： Fly ash Brick Geopolymer

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The Digitisation of the Cultural Heritage: Understanding the Requirements to Define a Methodology 11th

The Digitisation of the Cultural Heritage: Understanding the...

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11th International Conference of Ar.Tec.

作者： Angileri, Giuseppe Palmero-Iglesias, Luis Manuel Univ Messina Dipartimento Ingn Messina Italy Univ Politecn Valencia Escuela Tecn Super Ingn Edificac Valencia Spain

ISBN: (纸本)9783031718694;9783031718670;9783031718663

The preservation and transmission of knowledge in the digital era is often entrusted to the world of Information and Communications Technology. The advantage of this transition is the increase in the amount of information available via the web, while the disadvantages are mostly represented by the difficulty in accessing to this information or the accuracy and quality of them. In this context, the task of the academic expertise is to gain an intrinsic knowledge of the topic through experience in the field for clarify the best practices in the digitisation process. In the following article we analyse the role of digital technologies in the valorisation of architectural heritage through an analysis of the indications at European level and initiatives in two distinct cultural contexts, Spain, and Italy. After a comparative analysis of the various superordinate indications, we will investigate the strategies, methodologies and applications used in the two countries to digitise and promote their rich historical and cultural heritage also leveraging the experience of professor Palmero-Iglesias, who has been running a digitization project with European funds since 2019, called PROMETHEUS, which connects the experiences and skills of Italian and Spanish figures and others, to point toward a better understanding of best practices in the digitization process of cultural heritage in order to obtain a holistic digital future that can preserve the authentic values established in the place of origin with the objective of contribute to create a methodology in the field of digitisation, facilitating knowledge sharing and the potential development of international synergies.

关键词： Digitalizations process Cultural heritage Popular identity Intangible heritage Digital methodology

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