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

共 6935 条记录，以下是231-240 订阅

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Research on New Technology of Elastic Cushion Layer for Static Load Testing of Composite Foundations 1

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6th International Conference on civil engineering and Architecture (ICCEA)

作者： Xu, Fen-qiang Yao, Yun-long Li, Qing-hui Shao, Zhi-wei Wang, Gui-sen Nanjing Inst Technol Sch Civil Engn & Architecture Nanjing 211167 Peoples R China Hohai Univ Key Lab Minist Educ Geomech & Embankment Engn Nanjing 210098 Peoples R China Jiangsu Rd Construct Co Ltd Nanjing 210019 Peoples R China

ISBN: (数字)9789819753154

ISBN: (纸本)9789819753178;9789819753154;9789819753147

To address the limitation of conventional static load tests on composite foundations, this study presents an enhanced static load testing approach for composite foundations by incorporating an elastic cushion layer that simulates the stress adjustment effect of actual working conditions. Through field static load tests on composite foundations, this research examines the variations in settlement, pile-soil stress ratio, and pile head stress for different pile types (semi-rigid piles and flexible piles) and diverse cushion materials (sand cushion, elastic cushion). The feasibility of simulating actual working conditions using the elastic cushion layer was thoroughly assessed and demonstrated. The field static load tests demonstrated that the elastic cushion layer method for composite foundation testing was closer to the actual working condition of road embankment loading, as recommended by current specifications, and exhibited better overall performance and significant stress adjustment effects. This method more accurately captures the efficiency of practical engineering cushion layers, offering a novel avenue for quality testing pile-soil composite foundations.

关键词： composite foundation elastic cushion layer static load test similarity theory pile-soil stress ratio

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Improving Crack Detection on Concrete Structures Using Real-World Data Augmentation for Deep Learning Convolutional Neural Networks

Improving Crack Detection on Concrete Structures Using Real-...

引用

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

作者： Tello-Gil, Carlos Jabari, Shabnam Waugh, Lloyd Masry, Mark McGinn, Jared Univ New Brunswick Fredericton NB Canada Modelar Technol Ltd Toronto ON Canada New Brunswick Dept Transportat & Infrastruct Fredericton NB Canada

ISBN: (纸本)9783031615016;9783031614996;9783031614989

civil infrastructure materials deteriorate over time due to various physical and chemical processes, such as corrosion and thermal cycles. Surface cracks on concrete structures are often the initial indicator of degradation, making it essential to assess their nature, extent, and dimensions to determine the current state of the structure and take preventive measures to avoid future damage. However, traditional manual and visual inspection methods can be labor-intensive, hazardous, and subject to subjectivity and error, making it challenging to track the evolution of defects between inspections. Deep learning convolutional neural network (CNN) algorithms, such as Mask R-CNN, provide a high level of abstraction and generalization that is achieved through training on extensively annotated datasets. These algorithms have the potential to accurately segment cracks in images, thus providing a reliable and efficient means of assessing the state of concrete structures. However, publicly available crack datasets used for training the network often contain idealized crack images without real-world noise, such as dirt, leakages, or graffiti. Our study demonstrates that adding real-world features to a dataset and augmenting the amount of data samples can improve the accuracy of the network. We utilize the publicly available CRACK500 dataset and modify it by eliminating low-quality samples and adding real graffiti patterns. By doing this, the network was able to differentiate between cracks from graffiti and wet concrete marks on real-world images, achieving a precision of 97.8% and a recall of 53.1%.

关键词： Crack detection Mask R-CNN Data augmentation

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Impact of Flooding on Pavement Performance Using Integrated Hydraulic and Mechanical Modeling 5th

Impact of Flooding on Pavement Performance Using Integrated ...

引用

5th International Conference on Transportation Geotechnics

作者： Chen, Xiao Wang, Hao Rutgers State Univ Dept Civil & Environm Engn New Brunswick NJ 08901 USA

ISBN: (纸本)9789819782154;9789819782130;9789819782123

Flexible pavement structures are vulnerable due to the degradation of unbound materials after water inundation. This study aims to evaluate the resilience of flexible pavements to flooding events using an integrated hydraulic and mechanical modeling approach. Two-dimensional hydraulic models were established to analyze flooding-induced moisture variations in the pavements. Based on the moisture variation results, three-dimensional mechanical models that considered the moisturestress-matric suction-dependent modulus of unbound materials were developed to calculate critical pavement responses under vehicular loading. The increases in critical pavement responses due to flooding were analyzed and the increase in pavement damage during post-flooding recovery processes was predicted. The proposed methodology provides an effective way of quantifying the impact of flooding on long-term pavement performance.

关键词： Flooding Pavement Integrated model Moisture Critical response Damage

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Building Sustainability with Volcanic Ash: A Green Roof System Innovation 11th

Building Sustainability with Volcanic Ash: A Green Roof Syst...

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11th International Conference of Ar.Tec.

作者： Cascone, Stefano Fazio, Marianna Saeli, Manfredi Mediterranea Univ Reggio Calabria I-89124 Reggio Di Calabria Italy Univ Messina I-98166 Messina Italy Univ Palermo I-90128 Palermo Italy

ISBN: (纸本)9783031718656;9783031718632;9783031718625

This research introduces a novel approach to urban sustainability through the application of volcanic ash in green roof systems. Addressing the ecological challenges of urban heat islands and biodiversity loss, the study explores the potential of volcanic ash as a sustainable and efficient alternative to traditional green roof materials. Its unique properties, including superior water retention, effective drainage capabilities, and beneficial minerals, are thoroughly investigated. The methodology involves the systematic collection and processing of volcanic ash samples, followed by a series of comprehensive analyses. These include particle size distribution, compaction characteristics, and hydraulic properties. The study provides a comparative evaluation of volcanic ash in green roof applications, highlighting its advantages such as lower energy requirements for processing, reduced structural load, and potential for decreased long-term maintenance costs. Furthermore, the environmental impact, cost-effectiveness, and alignment of volcanic ash use with global sustainability goals are critically assessed. Moreover, building energy simulation is implemented to simulate the energy performance of a building equipped with a volcanic ash-based green roof system in comparison to commercial substrates and estimate the possible real efficacy of the proposed solution. The research concludes that volcanic ash significantly enhances the sustainability and resilience of urban environments, offering a scalable and environmentally friendly solution for green infrastructure development. It paves the way for further exploration and application in urban settings, promoting ecological balance and advancing sustainable urban planning.

关键词： Volcanic Material Applications Urban Ecological Balance Green Roof Technology Virtual Energy Simulation Circular Economy

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Behaviors Analysis of High Performance Composite Bearing Cap Made by UHPC Permanent Form for Offshore Wind Tower Foundation 1

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6th International Conference on civil engineering and Architecture (ICCEA)

作者： Liu, Dayong Wu, Zhongchong Lin, Lanri Wu, Xiangguo Zhang, Yun Wu, Chengen Wang, Hao Su, Jiazhan Zhong, Jing Zhou, Zheng Huang, Qiang Zhang, Mingyi You, Xianhui CGN New Energy Holdings Co Ltd Beijing Peoples R China Fuzhou Univ Coll Civil Engn Fuzhou 350108 Peoples R China Fuzhou Univ Coll Civil Engn Fujian Prov Key Lab Multidisasters Prevent & Miti Fuzhou 350108 Peoples R China Harbin Inst Technol Key Lab Struct Dynam Behav & Control Key Lab Smart Prevent & Mitigat Civil Engn Disast Minist Ind & Informat TechnolMinist Educ Harbin 150090 Peoples R China First Co China Eighth Engn Bur Ltd Jinan 250014 Peoples R China Sinovel Wind Grp Co Ltd Beijing 100086 Peoples R China Shanghai Elect Wind Power Grp Co Ltd Shanghai 200233 Peoples R China CFHI Heilongjiang Wind Power Hybrid Tower Co Ltd Fulaerji 161042 Peoples R China China Power Engn Consulting Grp Co Ltd Beijing 100120 Peoples R China

ISBN: (数字)9789819753154

ISBN: (纸本)9789819753178;9789819753154;9789819753147

High pile cap foundation is an important component of the supporting structure system for offshore fixed wind power. Due to the harsh marine environmental conditions, the development of high durability foundation caps is of great significance for improving the long-term service performance of the structure. Ultra high performance concrete (UHPC) has high strength and durability characteristics, and has superior application advantages in high-performance engineering structures. This paper proposes a high performance composite bearing cap structure using ultra-high performance concrete as a membrane shell without disassembly. The mechanical behaviors and failure mechanism are analyzed by numerical simulations under the serviceability limit state (SLS) and over-design state (ODS). The results show that the high performance composite bearing cap has better mechanical and deformation properties and excellent economic benefits compared with the normal conrete bearing cap.

关键词： High performance composite bearing cap Stay-in-place formwork Mechanical behavior Failure mechanism

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Mix Design of Early-Age Cementitious Treated Clay 6th

Mix Design of Early-Age Cementitious Treated Clay

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6th International Conference on civil engineering and Architecture (ICCEA)

作者： Lestari, Laras Laila Piscesa, Bambang Suprobo, Priyo Lastiasih, Yudhi Satria, Trihanindyo Rendy Sutrisno, Wahyuniarsih Asyifa, Hira Dewadatta, Ni Wayan Ayu Amrita Hariono, Syirly Adella Wijayanti Inst Teknol Sepuluh Nopember Dept Civil Engn Surabaya Indonesia Inst Teknol Adhi Tama Surabaya Dept Civil Engn Surabaya Indonesia

ISBN: (纸本)9789819753130;9789819753116;9789819753109

The aim of this research is focusing on the proportioning materials to meet the design purpose of Cementitious Treated Base (CTB). The natural soil of soft clay are mixed with two different type of Portland Cement, followed by the addition of quicklime (CaO) to improve strength and soil properties. The soil is treated with variation of cement content [C] (OPC and PCC) and quick lime [L] associated with C12L0, C8L4, and C4L8, then remolded to ensure the maximum density. Next, the remolded treated soil is cured for 3 days (early-age of CTB). The effect of cementitious content on compressive strength of CTB were investigated using UCS tests to provide an indicative measure of the strength and strain, which express the binding from mix design. The result showed that CTB is an effective method for soil improvement as it enhance the strength and reduce the strain due to cements' hydration to develop rigid bonds on the mixture. In this research, the cement content with highest compressive strength and lowest strain is C8L4, proposed as maximum mixing design of CTB. The long-term stabilization is required to achieve the purpose strength of CTB.

关键词： Cementitious Treated Base (CTB) mix design early-age compressive strength OPC treated clay PCC treated clay cement lime stabilization

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Numerical Study of a Concrete Beam with Hybrid Composite Material Strengthening 6th

Numerical Study of a Concrete Beam with Hybrid Composite Mat...

引用

6th International Conference on civil engineering and Architecture (ICCEA)

作者： Bouamra, Y. Tahar, H. Ait Labaci, O. Univ Bouira LM2D Lab Bouira Algeria

ISBN: (纸本)9789819753130;9789819753116;9789819753109

The numerous studies on the reinforcement of concrete beams using composite materials demonstrate that practically all of the research has concentrated on exterior reinforcement. In this research paper, we show the FE findings of the behavior of reinforced concrete beams with a new method of hybrid strengthening by coupling the GFRP composite grid and the FRP composite lamellae. The FRP composite lamellae is adhered to the bottom of the beam, and the GFRP composite grid is placed inside the beam. To better understand their behavior under a bending Load, numerical simulations based on finite elements were performed on three different strengthened beam types: Beams with GFRP grid reinforcement on the interior are designated "BRIC";Beams with FRP composite jacket on the exterior "BREC" and whereas beams with hybrid reinforcement is designated "BHR." The findings demonstrate that hybrid reinforcement enhances ultimate load, ductility, fracture strength, and energy dissipation capacity with matching deformation. Comparing the cost-effectiveness of the composite material to an external composite jacket for complete reinforcement. The strengthening approach has a substantial impact on the rupture mode.

关键词： Beam concrete composite hybrid strengthening simulation

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Challenges and Success Factors of Realizing Floating Projects-From the Perspectives of Dutch Experts in Floating City Development 3rd

Challenges and Success Factors of Realizing Floating Project...

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3rd World Conference on Floating Solutions (WCFS)

作者： Takahashi, Akane Lin, Fen-Yu Yoshida, Ikuo Blue21 Paardenmarkt 1A NL-2611 PA Delft Netherlands Shimizu Corp 2-16-1 KyobashiChuo Ku Tokyo 1048370 Japan

ISBN: (纸本)9789819704972;9789819704958;9789819704941

Floating development has recently gained increasing interests worldwide as a more climate-adaptive and future-proof alternative to land reclamation. The Netherlands is often considered to be a global leader in creating living space on the water and has abundant experiences and knowledge accumulated on developing floating structures for living and recreational purposes. Such valuable knowledge can be shared with the rest of the world with to inspire more people to realize floating projects. This research aims to collect insights from the Dutch floating development experts, identifying patterns in their experiences and their outlook for upscaling floating development in the Netherlands and abroad. The study applies a semi-structured interview method, and 15 representative Dutch experts were interviewed from the technical (design & engineering) community of floating projects. The results show that the biggest challenge of implementing floating projects is the "lack of financial attractiveness and financing mechanism to support". The most mentioned success factor is "having political support and visionary leadership", and the most mentioned key to upscaling floating development has to do with "having the right partners, cross-sectoral collaboration and involving all stakeholders". To upscale floating projects, the research concluded and recommended that "finding parties that demonstrate strong and visionary leadership", "creating or scouting for opportunities which would enable a larger floating project showcase to be realized", and "finding the best and most suitable location(s) in terms of wave conditions, logistics arrangement, manufacturing, and technical aspects".

关键词： Floating development Challenges Success factors Upscaling

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Improved Liquefaction Resilience of Transportation Infrastructure with Geofoam Buffers 5th

Improved Liquefaction Resilience of Transportation Infrastru...

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5th International Conference on Transportation Geotechnics

作者： Lakkimsetti, Balaji Latha, Gali Madhavi Indian Inst Sci Dept Civil Engn Bangalore 560012 Karnataka India

ISBN: (纸本)9789819782437;9789819782413;9789819782406

The efficacy of geofoam buffers in enhancing the seismic performance and dynamic load response of retaining walls and road embankments is well-established. However, limited research has been conducted to comprehend their role in mitigating soil liquefaction. This study investigates the shearing behavior of sands with Expanded Polystyrene (EPS) geofoam buffers, both before and after liquefaction, through a set of monotonic and cyclic simple shear tests. The investigation considers variations in layer thickness and geofoam density, employing two different thicknesses and three different densities in the tests. The results indicate that geofoam buffers reduce both pre-liquefaction and post-liquefaction shear strength of sand. However, they demonstrate a significant improvement in liquefaction resistance, with better outcomes observed at increased layer thickness and lower geofoam density. This enhancement is attributed to the exceptional energy absorption quality and compressibility of geofoam buffers. Nonetheless, this has a converse impact on the shear strength of sand. Consequently, it is imperative to carefully select the appropriate density and thickness of the geofoam layer to strike a balance between shear strength and liquefaction resistance.

关键词： Liquefaction EPS geofoam Simple shear test

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Adaptive Reuse in New Zealand: Enhancing Small-Town Resilience Through Heritage Buildings 1

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5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Kaynar, Cansu Inal Isaacs, Nigel Brown, Andre Noy, Ilan Victoria Univ Wellington Herenga Waka Wellington New Zealand

ISBN: (数字)9783031873164

ISBN: (纸本)9783031873188;9783031873164;9783031873157

Internationally, earthquake resilience is one of the most challenging issues for heritage buildings in earthquake-prone regions. Retaining essential aspects of heritage whilst ensuring adequate resilience can be difficult, particularly in towns with poor economies. New Zealand (NZ) has many listed heritage buildings in small-town centres, mostly built before the building code following the 1931 Hawke's Bay earthquake. They are rated earthquake-prone, leading to underuse. This affects their conservation and the town's overall earthquake resilience, creating a negative spiral of town vitality and economy. This paper investigates the potential of adaptive reuse as a strategy for enhancing the resilience of NZ small towns, focusing on heritage buildings. It examines the criteria for successful adaptive reuse projects and their impact on the social, environmental, and structural fabric. A key finding is a significant increase in a heritage building's habitation and seismic resilience when reused, contributing to a safer and more vibrant town centre. An adaptive reuse evaluation criteria matrix is developed, highlighting the multifaceted potential to improve sustainability and overall project quality. By considering factors beyond basic functionality, such as community benefit and cultural heritage preservation, adaptive reuse emerges as a powerful tool for creating more resilient, vibrant, and historically connected communities in small towns. This research aims to broaden the perspective of the construction field, equipping stakeholders with the insights needed to make informed decisions that yield societal rather than just financial optimal outcomes.

关键词： Adaptive reuse Heritage conservation Small-town centres Seismic resilience New Zealand Sustainability

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