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

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Optimizing Perception and Efficiency: Lead-Free Perovskite Nanocrystals for Enhanced Passive Daytime Radiative Cooling in Urban Environments 9th

Optimizing Perception and Efficiency: Lead-Free Perovskite N...

引用

9th International Building Physics Conference

作者： Marchini, Francesco Bondi, Roberto Fabiani, Claudia Latterini, Loredana Pisello, Anna Laura Univ Perugia Dept Chem Biol & Biotechnol Via Elce Sotto 8 I-06123 Perugia Italy Univ Perugia Dept Chem Biol & Biotechnol Nano4Light Lab Via Elce Sotto 8 I-06123 Perugia Italy Univ Perugia EAPLAB CIRIAF Interunivers Res Ctr Via G Duranti 67 Perugia Italy

ISBN: (纸本)9789819783076;9789819783052;9789819783045

To address the challenge of passive daytime radiative cooling (PRDC) applications in the built environment, silver or aluminum solar-reflective substrates are commonly used. However, their limited aesthetics hinder real-scale implementation in the large-scale urban context. Recent efforts to introduce colored radiative coolers have been facing issues, as the effective absorption of visible light contributes to surface heating, thus compromising the cooling performance. In this context, this work explores the outstanding properties of lead-free perovskite nanocrystals (NCs) as cost-effective layers to provide color to the PDRC structures while improving the rejection of shortwave radiation through photoluminescence mechanism. By combining different NCs emitting in blue, green and red regions, color can be tailored to this aim, offering a promising strategy for the optimal integration of PDRCs into the existing urban fabric. In addition, the inclusion in polymer matrices produced colored thin films with good stability and efficient response in the atmospheric windows wavelengths (epsilon((8-13 mu m)) = 0.90). Finally, the integration of lead-free perovskite films in PDRC structures has been examined, aiming to definitively harness the crucial potential of radiative cooling in enhancing building energy performance and counteracting UHI.

关键词： Radiative cooling Lead-free perovskite Photoluminescence UHI mitigation Passive Daytime Radiative Cooling

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Comparison of Regressors Applied to 3D Motion Marker Data of a Historic Building Prototype Subjected to Shake Table Tests 1

引用

5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Palumbo, Domenico Ormando, Chiara Roselli, Ivan ENEA Casaccia Res Ctr Rome Italy

ISBN: (数字)9783031873164

ISBN: (纸本)9783031873188;9783031873164;9783031873157

In the present study the performance of several machine learning regression techniques for the analysis of displacement data acquired in dynamic identification shaking table tests to assess a building's prototype state of damage were compared. The displacement data of a typical Italian historic masonry building prototype were recorded by a passive 3D motion capture system. These recorded displacement data were analyzed by calculating a widely accepted Damage Index (DI) based on the decay of the first modal frequency of the tested structure. To such purpose, a conventional Frequency Response Function (FRF) algorithm for modal analysis was adopted. Then, several regressors, commonly used in machine learning applications, were applied to cepstral coefficients extracted from time-series segmentation of the 3D motion markers signals to predict the DI values. To assess the quality of the tested regressors, Coefficient of determination (R-2) and Relative Percent Deviation (RPD) parameters were evaluated. Different lengths of time-series segments were also explored and the results were statistically compared to highlight the differences between regressors. Excellent results were obtained in terms of R-2 (0.98) and RPD (6.87) with a weak dependence on the time partitioning performed on the data with optimal results for 4 or more seconds. Moreover, Stacked Regressor, Decision Tree Bagging Regressor and XGB Regressor were found as the best overall regressors. The results obtained demonstrated that machine learning methods can be effectively utilized to predict the level of damage of historic masonry buildings with very high accuracy.

关键词： machine learning regression historic buildings

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Guidelines for Designing a Facility Management Digital Twin Dashboard 20th

Guidelines for Designing a Facility Management Digital Twin ...

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

作者： Mata, Andrea El Mokhtari, Karim McArthur, J. J. Toronto Metropolitan Univ Dept Architectural Sci Toronto ON M5B 2K3 Canada FuseForward Solut Grp Vancouver BC Canada

ISBN: (纸本)9783031842108;9783031842085;9783031842078

Digital Twins are becoming increasingly popular to support Facility Management. However, the visual interface for most digital tins consists either of 3D models or sets of graphs. These frequently do not showcase the most critical information in a clear and concise manner. In order to improve visualization in this context, this paper develops a design framework informed by the user interface/user experience and universal design literature as well as the five principles of user experience and user interface design: scale, visual hierarchy, balance, contrast, and gestalt theory. The resultant framework is then applied to develop a dashboard for a digital twin of a multi-use lab, classroom, office, and residential building. The research methodology consisted of four key steps: 1) identification of key performance indicators necessary;2) developing a data streaming, analysis, and processing strategy;3) conceptual dashboard creation using the web-based application Figma;and 4) integration of queries, real-time updates, and navigation to refine the dashboard. Both the refined dashboard and a framework to guide other digital twin dashboard development are presented herein.

关键词： Digital Twin Graphical User Interface (GUI) User Experience Design Guidelines

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Datamining Smart Thermostat Use in Homes to Understand COVID-19 and Telework-Induced Behaviors 9th

Datamining Smart Thermostat Use in Homes to Understand COVID...

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9th International Building Physics Conference

作者： Sirati, Melina Doma, Aya O'Brien, William Cruickshank, Cynthia A. Carleton Univ Dept Civil & Environm Engn Ottawa ON Canada Concordia Univ Dept Bldg Civil & Environm Engn Montreal PQ Canada Carleton Univ Dept Mech & Aerosp Engn Ottawa ON Canada

ISBN: (纸本)9789819783199;9789819783175;9789819783168

Due to the widespread implementation of hybrid work arrangements stemming from the COVID-19 pandemic, it isworth examining the effect ofworking from home on energy consumption post-pandemic. Besides, it is important to explore the thermostat setting preferences of teleworkers when they are working from home. Data obtained through the "ecobee" thermostat system's "DonateYour Data" program, encompassing over 22,000 connected thermostats across Canada spanning multiple years was used in this study to analyze occupancy patterns in Canadian homes during the COVID-19 pandemic, before (January 2017-February 2019) and after (June 2022-June 2023) the pandemic. This study investigated the evolving connection between working from home patterns as the prevalent example of partial occupancy in homes and thermostat use behavior in residential settings. Additionally, it addressed the prevalence of setback temperature strategies during winter in unoccupancy periods in households. The analysis indicated that 10% of the filtered 5,544 households in Canada adopted telework post-pandemic, with 50% of them working from home five days a week. Using the methodology described in this paper, it was found that 67% (377 out of 563) of households that adopted teleworking post-pandemic utilized a setback when departing their homes on weekdays during winter pre-pandemic. Furthermore, 54% of households that adopted telework post-pandemic used a higher thermostat setpoint in winter, while 73% used a lower setpoint in summer during office hours at home.

关键词： Telework Residential Building Smart Thermostat

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Experimental Investigations on the Influence of Tailored Preloading on the Creep Behaviour of Concrete and its Variability 4th

Experimental Investigations on the Influence of Tailored Pre...

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4th FIB International Conference on Concrete Sustainability

作者： Taube, Christopher Flohr, Alexander Morgenthal, Guido Osburg, Andrea Bauhaus Univ Weimar Weimar Germany

ISBN: (纸本)9783031806742;9783031806728;9783031806711

The time-dependent load-bearing behaviour of concrete and the considerable model uncertainties in its prediction pose significant challenges for the sustainable and material-efficient design of concrete structures. The creep behaviour is significantly influenced by the material composition and the ambient conditions, but also by the load history. The aim of this article is to illustrate the influenceability of the creep tendency of concretes and its improved predictability through the tailored application of preloads above the subsequent permanent load level. For this purpose, four experimental test series on normal concrete and polymer-modified concrete are designed, carried out and evaluated, with the main focus on investigating the influence of preloading intensity and timing. Furthermore, it is investigated to what extent the structural changes associated with the preloading affect the properties of the short-term load-bearing behaviour. The presented results will serve as a basis for further experimental, analytical, and numerical investigations to enable accurate prediction and manipulation of the time-dependent deformation behaviour of modern concrete structures, which may lead to more material efficient and sustainable design.

关键词： concrete creeping prestressing material modification material efficiency

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Strengthening Historical Wood Structural Floors with Adhesive-Based Timber-Concrete Composites 5th

Strengthening Historical Wood Structural Floors with Adhesiv...

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5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Juhasz, Tamas Orban, Zoltan Fulop, Attila Balogh, Jeno Univ Pecs Inst Smart Technol & Engn H-7624 Pecs Hungary Metropolitan State Univ Denver Dept Engn Coll Aerosp Comp Engn & Design Denver CO 80217 USA

ISBN: (纸本)9783031873140;9783031873126;9783031873119

Historical wood structures face a significant challenge in preserving architectural heritage while meeting modern safety and durability standards, i.e., higher structural rigidity, soundproofing, and better thermal performance and fire protection. Wood structural floors among these structures are particularly vulnerable due to age, wear, and load requirements. Traditional methods of strengthening, such as complete replacement or adding additional supports, often compromise the original aesthetics and structural integrity. This paper explores various aspects of applying adhesive-based timber-concrete composite structures as a sustainable and efficient solution for strengthening historical wood structural floors while preserving their architectural authenticity. A high moisture-tolerant adhesive is used to bond the timber floor beams to a thin layer of fresh concrete placed on the top. The structural behavior of such composite beams is studied using finite element models and non-destructive material tests. The results indicate that the adhesive-based interlayer connection provides increased stiffness and load-carrying capacity, which leads to efficient composite members that can be conveniently employed in historical preservation projects. By reducing the need for extensive demolition and reconstruction, this approach aligns with conservation and sustainable development principles.

关键词： Timber-Concrete Composite Floor Systems Non-Destructive Material Testing

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Numerical Simulation Study of Dam-Break Based on SPH Method 11th

Numerical Simulation Study of Dam-Break Based on SPH Method

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11th International Conference on Coastal and Ocean engineering

作者： Huo, Ye Zhong, Yuguang Zhao, HuanYu Li, Songcheng Jiang, Yuanbo Harbin Engn Univ Coll Mech & Elect Engn Harbin 150001 Peoples R China AVIC Aerodynam Res Inst Liaoning Prov Key Lab Aircraft Ice Protect Shenyang 110034 Peoples R China Liao Shen Ind Grp Co Ltd Shenyang 110045 Peoples R China

ISBN: (纸本)9789819601837;9789819601813;9789819601806

The smooth particle hydrodynamics (SPH) method is a meshless method in a pure Lagrangian framework, which is suitable for simulating wave overturning and breaking, high-speed jets and other dynamic boundary and large deformation problems. This manuscript introduces the basic principles and improvement methods of the SPH method, and uses the SPH method to establish different types of numerical flume models, and simulates the dam-breaking motions of different types of flumes in detail. Comparison of the computational results of the SPH simulation and the experimental results from the literature reveals that the computational results of the adopted SPH method match the experimental results from the literature to a high degree, and are able to accurately capture the droplet splashing, free surface deformation, etc., which validates the stability of the numerical model. By comparing the simulation of dam failure flow of two different forms of energy dissipating cans, the energy dissipation effect of the two types of barriers is analyzed and compared.

关键词： The smooth particle hydrodynamics Dam-break Obstacle

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A Structured Approach to 4D Printing for Rapid Prototyping in Construction

A Structured Approach to 4D Printing for Rapid Prototyping i...

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Annual Conference of the Canadian-Society-for-civil-engineering (CSCE)

作者： Ataei, Farhang Boton, Conrad Ecole Technol Super ETS Dept Construct Engn Montreal PQ Canada

ISBN: (纸本)9783031615016;9783031614996;9783031614989

Over the past three decades, the success of 3D printing technology has led researchers to achieve 4D technology by investigating and improving on 3D printing technology. 4D printing has emerged as research related to smart materials has progressed. With 4D printing, it is possible to create movement and change the shape and size of printed microstructures. Shape memory materials can be programmed to change with stimuli such as temperature, light, electricity, humidity, magnetism, etc. Using 4D printing, shape memory materials can be programmed to change with these stimuli. These dynamic changes could have the potential to revolutionize or change many industries. It appears that most research has focused on material properties and optimization of 4D printing method. The practical application of 4D printing in industries such as construction is still in its infancy. Many research studies have stated that the use of new technologies in the industry today is one of the practical ways to achieve optimal productivity. This project aims to pave the way for the use of 4D printing technology in the construction sector by proposing a neutral conceptual framework. The framework is evaluated by printing shape-memory materials available in the market using Fused deposition modelling (FDM) technology. By planning the types of movements and desired locations, choosing materials and types of movement, and assessing the expected changes in smaller laboratory models, conclusions can be reached for the use of these methods on larger scales. This research will investigate the basic and practical procedures of 4D printing as well as materials, stimuli, and printing technology. A 3D origami is printed using parts made of 3D printing materials as fixed materials and shape memory materials as materials that create movement.

关键词： 4D printing Additive manufacturing Construction Digital fabrication Rapid prototyping

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Evaluating the Reliability and Repeatability of Novel Laboratory Equipment in Investigating the Performance of Geosynthetic-Reinforced Soils 5th

Evaluating the Reliability and Repeatability of Novel Labora...

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5th International Conference on Transportation Geotechnics

作者： Qiu, Jiacheng Chen, Yue Xie, Yuekai Xue, Jianfeng Gallage, Chaminda Jaksa, Mark Univ New South Wales Sch Engn & Technol Sydney NSW Australia Queensland Univ Technol Sch Civil & Environm Engn Brisbane Qld 4001 Australia Univ Adelaide Sch Architecture & Civil Engn Adelaide SA 5005 Australia

ISBN: (纸本)9789819782437;9789819782413;9789819782406

Geosynthetics have been employed as reinforcements to improve pavement behaviours. Previous attempts have been made to compare the performance of geosynthetic-reinforced soils with unreinforced soils through large-scale laboratory tests. However, large-scale testing is considered time-consuming and costly, which reduces the repeatability and reliability of such tests. Therefore, it is crucial to develop a small-scale testing apparatus, which is capable of evaluating the reinforcing effects of geosynthetics in pavements. In this study, a small-scale laboratory testing method was employed to investigate the performance of geocomposites in improving the penetration resistance of the reinforced soil system. Several tests were performed to validate the repeatability of the proposed testing apparatus. The results of this study demonstrate the capability of the developed testing method to produce consistent and repeatable results, which highlights its potential application in measuring the reinforcing effects of geosynthetics in pavements.

关键词： Geosynthetics Pavement engineering Small-scale laboratory testing

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Assessment of Approaches to Enrich a Case Base for Design Decision 20th

Assessment of Approaches to Enrich a Case Base for Design De...

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

作者： Napps, Daniel Konig, Markus Ruhr Univ Dept Civil & Environm Engn Bochum Germany

ISBN: (纸本)9783031842108;9783031842085;9783031842078

Architects encounter the challenge of generating building designs and conceptual customizations during early design stages in an individual and time-efficient manner. Case-Based Reasoning enables support for this process by using similar experienced situations for problem solving of future scenarios. In this context, previously created digital building models can be reused as inspiration and data basis in future projects. This involves comparing the similarities of specific building elements or entire structures within a case database against the design requirements of a future project. This enables an architect to leverage a previously designed building and adapt it to the needs of the current project. However, building models consume substantial storage and assessing similarities often necessitates manual and time-consuming evaluations. Nonetheless, transforming building information models into knowledge graphs based on the international Industry Foundation Classes standard provides low computer memory utilization and fast information processing. For this approach, it is essential to create a case database containing a considerable quantity of data so that problem-specific solutions can be optimally retrieved. This paper presents various approaches for enriching the graph-based case base and examines them for a specific already developed framework. In addition to a manual solution for generating suitable data independently of a digital building model, various Artificial Intelligence methods are assessed and tested to generate synthetic building graphs. This includes an examination of different Generative Graph Models as well as the evaluation of Neural Networks.

关键词： Design Decision Case Base Knowledge Database Building Graphs Early Design Phases

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