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

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Enhancing Performance of Internally Insulated Solid Masonry Wall: Use of Moisture Adaptive Membranes 9th

Enhancing Performance of Internally Insulated Solid Masonry ...

引用

9th International Building Physics Conference

作者： Jensen, Nickolaj Feldt Peuhkuri, Ruut H. Hansen, Ernst Jan de Place Pagoni, Panagiota Moller, Eva B. Aalborg Univ DK-2450 Copenhagen Denmark Tech Univ Denmark DK-2800 Lyngby Denmark

ISBN: (纸本)9789819783076;9789819783052;9789819783045

Moisture-safe retrofitting and energy optimization of facades in existing buildings may be challenging, especially for buildings with preservation-worthy or historical facades. Internal insulation changes the hygrothermal conditions of the original wall and may cause several problems, like biological growth and masonry deterioration. This paper explores the use of moisture-adaptive membranes as an additional moisture control measure for safe retrofitting with internal insulation. The results are based on WUFI (R) Pro simulations. Parameters like minimal and maximal vapour diffusion resistance, relative humidity (RH) range at which the membrane is most diffusion-open and -tight, indoor humidity class, orientation, and insulation type are varied and evaluated with a theoretical mould growth model. Results indicate that the adaptive membrane should already be highly diffusion-open at around 75% RH and highly diffusion-tight in periods with low RH (up to around 40%). Results indicate that this would ensure a moisture-safe construction in humidity classes 2-4 using mineral wool. When using organic insulation materials, there might be a risk in humidity class 4.

关键词： Internal insulation Moisture adaptive membranes Mould risk

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Identification of Distinct Shakedown Ranges for Saturated Clay Under Cyclic Traffic Loading 5th

Identification of Distinct Shakedown Ranges for Saturated Cl...

引用

5th International Conference on Transportation Geotechnics

作者： Lei, Hao Qian, Jiangu Tongji Univ Dept Geotech Engn Shanghai Peoples R China

ISBN: (纸本)9789819782314;9789819782291;9789819782284

Long-term traffic loadings will induce strong vibrations in the saturated ground, and it probably produces excessive settlements of saturated ground and even various distresses (such as cracks and leakage) of the tunnel structure. To better understand the long-term cyclic deformation behaviors of saturated clay subjected to cyclic traffic loading, a series of cyclic undrained hollow cylinder apparatus tests were performed on Shanghai saturated clay. The secondary cyclic compression stage of permanent axial strain, energy dissipation, and damping ratio are employed to identify the distinct shakedown ranges of saturated clay. Moreover, attempts are made to establish a link between the permanent deformation behavior invoked by different levels of dynamic stress and a kinematic yielding framework. The cyclic test results of Shanghai clay can be classified as plastic shakedown, plastic creep, and incremental collapse, and Y-2 and Y-3 yield limits are interpreted as threshold cyclic dynamic stress to divide the shakedown ranges. Additionally, the effective cyclic dynamic stress ratio can better identify the shakedown ranges of saturated clay. Eventually, a criterion is recommended to identify distinct shakedown ranges of saturated clay. The findings will contribute to the safe design of the transport infrastructure in saturated ground.

关键词： Shakedown theory Cyclic undrained shear tests Saturated clay

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Study for the Protection of Historic Buildings Due to the Construction of a Tunnel Through TBM in the City of Guadalajara, Mexico 1

引用

5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Oscar, San Roman Eduardo, Botero Efrain, Ovando Univ Nacl Autonoma Mexico Inst Engn Mexico City Mexico

ISBN: (数字)9783031873164

ISBN: (纸本)9783031873188;9783031873164;9783031873157

The Guadalajara Light Rail Line 3 project included a tunnel close to or under essential buildings, including the Guadalajara Cathedral. To this end, an assessment was made of the possible settlements produced both by the construction of the tunnel and the construction of the protective measures. To analyze settlements and the effectiveness of the protective measures, the characteristics of the Cathedral and those of the tunnel's construction procedures and the protective measures were modeled approximately. For this purpose, three-dimensional numerical models were created using the finite element program PLAXIS 3D, to incorporate the main factors that could affect the structural integrity of the Cathedral and the Sagrario church.

关键词： Protection measures Tunnel Historic buildings Settlements Threedimensional numerical model TBM

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Digital engineering in Infrastructure Geotechnics 5th

Digital Engineering in Infrastructure Geotechnics

引用

5th International Conference on Transportation Geotechnics

作者： Chan, M. K. Peter Douglas Partners South Melbourne Vic 3105 Australia

ISBN: (纸本)9789819782239;9789819782215;9789819782208

This paper shares recent experience dealing with the massive site investigation dataset on a major road infrastructure project, in the context of ISO19650, and from a geotechnical engineer's perspective. This subject project includes a freeway-to-freeway interchange, with 6.5 km of freeway widening and the associated geotechnical design of 20+ bridges and civil works. This paper demonstrates the importance of the evolving technology, which enables data-centric thinking to be applied to the geotechnical risk identification. It is shown that "first-pass" qualitative geospatial models play an important role in the early identification and quantification of design risks for the optimisation of overall design at the bidding stage. The paper discusses the process and the difficulties incorporating the variety of historical data into the project-specific geotechnical dataset, and the progressive collection, homogenisation and refinement from various sources and formats, for a dynamic collaboration with other design disciplines in regard to the geo-spatial, laboratory and field test data, thereby driving a cost-effective geotechnical design.

关键词： ISO 19650 Digital twin Geotechnical risk assessment

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Evaluation of the Effect of Sodium Lignosulfonate and Alcohol Amine on the Performance of Water Cement Slurry 2nd

Evaluation of the Effect of Sodium Lignosulfonate and Alcoho...

引用

2nd International Conference on Geosynthetics and Environmental engineering

作者： Yang Haiyan Lv Mingjie Li Yueru Yu Chen Shi Ya Rui Zhou PetroChina Oilfield Co Xian Changqing Chem Grp Co Ltd Changqing Oilfield Xian 710068 Peoples R China PetroChina Oilfield Co Changqing Oilfield Prod Plant 12 Xian 710000 Peoples R China Xian Shiyou Univ Shaanxi Prov Key Lab Environm Pollut Control & Re Xian 710065 Peoples R China Xian Shiyou Univ Shaanxi Univ Engn Res Ctr Oil & Gas Field Chem Xian 710065 Peoples R China

ISBN: (纸本)9789819777686;9789819777662;9789819777655

The thickening properties, rheological properties, density and flexibility of cement paste of sodium lignosulfonate, Ethanolamine, Diethanolamine and Triethanolamine were evaluated. The results show that ethylene glycol, Ethylenediamine and Sodium ethoxide can change the properties of cement slurry to a certain extent, but will not significantly improve the mechanical properties of cement slurry. Diethanolamine and Triethanolamine can reduce the thickening time of cement slurry to 57 min and 22 min respectively when they have little effect on the initial consistency and rheological properties of cement slurry.

关键词： Cement paste Thickening properties Rheological properties Density Flexibility

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Digital Evolution: From BIM to Digital Twin 11th

Digital Evolution: From BIM to Digital Twin

引用

11th International Conference of Ar.Tec.

作者： Salzano, Antonio Zitiello, Enrico Pasquale Nicolella, Maurizio Gragnaniello, Chiara Univ Naples Federico II Dept Civil Architectural & Environm Engn I-80125 Naples Italy Univ Naples Federico II Dept Struct Engn & Architecture I-80125 Naples Italy

ISBN: (纸本)9783031718694;9783031718670;9783031718663

In recent decades, technological advancements in areas such as the Internet of Things (IoT) and artificial intelligence have facilitated the digitalization of various resources, systems, and processes across various industrial sectors. Progress in virtual modeling and data acquisition technology has contributed to the emergence and development of the Digital Twin, a virtual representation of a physical asset that utilizes technologies such as sensors, IoT, communication networks, and 3D models to collect real-time data useful for monitoring its performance throughout its lifecycle. This work aims to emphasize the importance of applying Digital Twin technology in the construction sector, which helps understand the evolutionary behaviors and performance of a structure over time and space. It considers how the elements (materials, systems, etc.) composing the structure degrade based on various environmental conditions and user occupancy patterns. Simultaneously, through analysis and monitoring of physical assets using the digital twin, it becomes possible to determine the optimal time to intervene and replace worn-out components or systems, thus ensuring the continuous functionality of the structure to maintain performance at optimal levels. In the coming years, technology will enable the integration of artificial intelligence into the construction sector. This will allow the analysis of performance, both pre- and post-construction, to anticipate evolving needs with a high degree of probability. This will be facilitated by the collection of statistical data and the comparison of performance behaviors from buildings that are typologically and morphologically similar.

关键词： Artificial intelligence Digital twin Building information modeling Facility management Internet of things

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A Multidisciplinary, Innovative, and Traditional Investigation Approach to Preserve a Historic Center Affected by Complex Landslides 1

引用

5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Infante, Donato Khalili, Mohammad Amin Sepe, Ciro Di Martire, Diego Ramondini, Massimo Federico II Univ Naples SINTEMA Engn Srl SPINOFF Naples Italy Univ Naples Federico II Dept Earth Sci Environm & Resources Sci I-80126 Naples Italy Univ Naples Federico II Dept Civil Architectural & Environm Engn I-80125 Naples Italy

ISBN: (数字)9783031873164

ISBN: (纸本)9783031873188;9783031873164;9783031873157

This study focuses on evaluating slope stability in the historical center of Caulonia, located in the Calabria Region of Southern Italy. Caulonia is positioned in a geologically intricate area characterized by a Miocene succession of "varicoloured clays" at the base, overlain by conglomerates, sandstones, and pelites. Landslide events have been triggered by several factors, including seismic activity (such as the 1783 earthquake), heavy rainfall, and anthropogenic factors. To identify the most effective risk mitigation strategies for protecting key historical structures, a multidisciplinary approach was employed. Innovative techniques, including using UAVs, were utilized to reconstruct the area's current topography, while ground deformation analysis using Differential Interferometry SAR (DInSAR) was performed by processing COSMO-SkyMed satellite images acquired between 2015 and 2021. This analysis helped identify the historical movement patterns of landslides. Additionally, geological, geomorphological, geotechnical, and geophysical surveys contributed to defining a geotechnical failure model. Combining these traditional and innovative methods has proven effective in understanding the complex landslide dynamics and developing interventions to preserve the village's historical landmarks.

关键词： Slope Stability Landslide Mitigation Caulonia UAV Topography DInSAR Analysis Geotechnical Monitoring

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The Active Conservation of an Andalusian Patio House: A Project Experience Between Italy and Spain 11th

The Active Conservation of an Andalusian Patio House: A Proj...

引用

11th International Conference of Ar.Tec.

作者： Bellicoso, Alessandra Berti, Krizia Albarreal Nunez, Maria Jestis Univ Aquila Dept Civil Construct Architectural & Environm Eng I-67100 Laquila Italy Univ Seville Dept Bldg Construct 2 Seville 41012 Spain

ISBN: (纸本)9783031718571;9783031718557;9783031718540

The research falls within the context of the refurbishment and regeneration of the predominantly residential building tissue in consolidated urban contexts which, subject to a continuous process of modification, are characterized in terms of a palimpsest. The goal is to re-read this transformative process and identify the codes that have regulated it in order to ensure its continuity through active conservation interventions on the building tissue that ensure its protection on the one hand and regenerative recovery on the other. The relationship between type, technique and project is assumed as the operational key of a methodology that seeks the definition not only of the qualitative parameters attributable to the recognition of the peculiarities and the complex of values of the historical building heritage and to their translation in a critical-interpretative key in the levels of transformability, but also of those of a quantitative type, referable to the performance levels connected to a necessary adaptation to new needs. The paper intends to report the results of the experimentation of the research work, conducted in the framework of collaborative relationships between the University of L'Aquila and the University of Seville, on an old traditional Andalusian patio house located in the historic center of Seville. The building is the subject of various interventions up to that of 1952 by the Regionalist architect Antonio Delgado y Roig. The project experimentation seeks a model of use compatible with the characteristics of the type, investigated in the complex of its functional, formal and constructive aspects and defines congruent intervention strategies. The design intentions are finally translated into technical-construction choices that find precise and punctual detailed solutions within the building schedule according to technical codes referable to a form of advanced craftsmanship, both in the use of traditional and innovative materials.

关键词： Traditional architecture Seville Typology Patio house Active conservation

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Fundamental Study on Consistency, Compaction, and Strength Properties of Soils Treated with Rice Husk Ash 5th

Fundamental Study on Consistency, Compaction, and Strength P...

引用

5th International Conference on Transportation Geotechnics

作者： Jamil, Muhammad Abu-Bakr Hayano, Kimitoshi Yokohama Natl Univ Grad Sch Urban Innovat Yokohama Kanagawa Japan Yokohama Natl Univ Fac Urban Innovat Yokohama Kanagawa Japan

ISBN: (纸本)9789819782390;9789819782376;9789819782369

Highway, road, and airfield construction on weak soils is costly endeavor. Re-use of agricultural waste is widely employed as a stabilizing agent to improve engineering properties of these soils. In this study, rice husk ash (RHA), a by-product of incineration of husk from rice production, was used as a potential stabilizer. The water absorption and retention rate of the stabilizer, denoted as W-ab, is determined by measuring the amount of water that is absorbed and retained by the stabilizer in relation to its initial dry mass. The study involved treatingAo clay, imitating a dredged soil with highwater content, at various addition ratios (ARHA). Diverse curing periods were applied to assess the liquid limits (w(L)), plastic limits (w(P)), and cone index (q(c)) of the treated clays. Compaction characteristics were also determined for several ARHA and different curing periods. The test results show an increase in both w(L) and w(P) with decrease in plastic index (I-p) with increase in ARHA, but no remarkable change in w(L) and w(P) associated with curing. Compaction characteristics show a decline in rho(dmax) and increase in wopt with increase in ARHA, but no notable changes in rho(dmax) and wopt with cured samples. Increase in q(c) with ARHA, but no noteworthy change in q(c) with curing was discerned through cone index test. The trends for curing observed in the above test results were consistent with that observed for W-ab. The results were then modified based on the W-ab of stabilizer. The measured water content (w) and liquidity index (IL) were modified to account for absorbed water (w*), which gave a better correlation with q(c) than w. The compaction characteristics were also modified based on Wab, ARHA and the results suggest that treated clays were able to achieve modified dry density (rho(dmax)*) at the same values of modified water content (w(opt)*).

关键词： Rice husk ash Water absorption and retention rate Cone index Atterberg limits Compaction characteristics

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Hygrothermal Properties of Mortar Layers: Implications for Freeze-Thaw Damage in Brick Walls 9th

Hygrothermal Properties of Mortar Layers: Implications for F...

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9th International Building Physics Conference

作者： Xie, Huarong Huo, Lei Li, Yanan Xia, Changchang Li, Yonghui Hokoi, Shuichi Southeast Univ Sch Architecture Nanjing 210096 Peoples R China Beijing Urban Engn Design & Res Inst Co Ltd Beijing Peoples R China

ISBN: (纸本)9789819783076;9789819783052;9789819783045

During the freezing process, the expansion of moisture within the building material leads to increased pressure and may result in cracking and delamination of the material. The phenomenon of freeze-thaw damage to brick walls poses a significant threat to the value and performance of masonry heritage buildings. Brick wall is a masonry composed of sintered brick and mortar, and the differences in the moisture transport properties and icing characteristics of the two materials make the temperature and moisture distribution of the brick wall during the freeze-thaw process very complex. This study proposes a gas-liquid-solid three-phase equilibrium heat and moisture coupling transfer model to simulate the process of continuous freezing of three types of wall surfaces, namely, pure bricks, lime-mortar brick walls and cement-mortar brickwalls, after absorbing water for a certain period. We found that mortar significantly impacts the wall's freeze-thaw cycle, with different effects at various stages. Initially, as the wall absorbs external moisture, the mortar layer blocks this moisture from reaching the bricks, increasing icing on the mortar's exterior. Lime mortar, being more porous, initially reduces ice formation inside (warm side) by absorbing more water. However, as freezing progresses, it prevents water from moving from the warm to the cold side, leading to interior icing. In contrast, cement mortar's influence diminishes in the stabilization phase, while lime mortar's greater porosity continues to reduce icing on the exterior by retaining more moisture.

关键词： Freeze-thaw damage Brick walls Heat and moisture transfer Mortar properties Hygrothermal analysis

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