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6th fib International Congress on Concrete Innovation for Sustainability, 2022

作者： Preinstorfer, Philipp Yanik, Serdar Kirnbauer, Johannes Robisson, Agathe Department of Engineering University of Cambridge Cambridge United Kingdom Institute of Structural Engineering TU Wien Vienna Austria Institute of Material Technology Building Physics and Building Ecology TU Wien Vienna Austria

ISBN: (纸本)9782940643158

Textile-reinforced concrete is a novel composite material consisting of high-performance textile fabrics and high-strength concrete. Due to differences in the shape and the mechanical properties of the reinforcement, a direct transfer of existing knowledge on the bond behaviour of steel reinforcement is not possible. While it has been shown in the past that the geometric properties of the textile reinforcement are essential parameters that influence the bond properties, few investigations have been carried out on the cracking behaviour of textile-reinforced concrete itself. In this paper, the results of an extensive experimental campaign on the crack progression in textile-reinforced concrete elements under uniaxial tension is presented. In total 48 test specimens with different geometric properties and different surface characteristics were monitored during testing with advanced measuring techniques such as digital image correlation (DIC). This allows for an evaluation of the crack widths at different load stages. Additionally, laser scans on all tested fibre strands were conducted in order to get 3d-models of the different fabrics used. The geometry determined from these scans is linked to the results from the uniaxial tensile tests. The results clearly indicate the dependence of the cracking behaviour on the shape of the different textile types. Furthermore, if the crack width is a decisive criterion in the serviceability limit state, an additional sand coating guarantees smaller crack widths and distances. © Fédération Internationale du Béton – International Federation for structural Concrete.

关键词： Environmental impact

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Neural Network Based Algorithm to Estimate the Axial Capacity of Corroded RC Columns 1

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5th International Conference on Information Systems and Management Science, ISMS 2022

作者： Kumar, Yogesh Arora, Harish Chandra Kumar, Aman Kumar, Krishna Rai, Hardeep Singh Ludhiana141006 India Structural Engineering Department CSIR—Central Building Research Institute Roorkee247667 India Ghaziabad201002 India Department of Hydro and Renewable Energy Indian Institute of Technology Roorkee247667 India

ISBN: (数字)9783031311536

ISBN: (纸本)9783031311529

Columns are the important structural elements to transfer the superstructures load to the foundation. Deterioration and degradation of the structural elements is the critical issue facing by the entire world. Corrosion is one of the most common cause responsible for the deterioration. To maintain structural safety as well as serviceability, it is important to estimate the residual capacity of the deteriorated reinforced concrete columns. Available analytical models are unable to give the desired results, as these models were based on various assumptions and developed with a limited dataset only. These challenging issues are addressed by artificial intelligence based on machine learning techniques. In this work, the neural network-based model is developed to estimate the residual capacity of the corroded RC columns. The proposed model has good accuracy with an R2-value (the coefficient of determination) of 0.9981 and a mean absolute percentage error of 3.84%. The other performance indices such as mean absolute error, Nash-Sutcliffe effecience index, and a20-index have 10.97 kN, 0.99, and 0.96 values, respectively. The proposed model can be utilized by structural designers and researchers to estimate the residual life of the corroded RC columns. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Reinforced concrete

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ML-Based Computational Model to Estimate the Compressive Strength of Sustainable Concrete Integrating Silica Fume and Steel Fibers 5th

ML-Based Computational Model to Estimate the Compressive Str...

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5th International Conference on Information Systems and Management Science, ISMS 2022

作者： Sahota, Sarvanshdeep Singh Arora, Harish Chandra Kumar, Aman Kumar, Krishna Rai, Hardeep Singh Ludhiana141006 India Structural Engineering Department CSIR-Central Building Research Institute Roorkee247667 India Ghaziabad201002 India Department of Hydro and Renewable Energy Indian Institute of Technology Roorkee247667 India

ISBN: (纸本)9783031311529

Concrete is one of the most commonly used construction material on the earth after water. The compressive strength of concrete is an important parameter and is considered in all structural designs. Production of the cement is directly proportional to carbon emissions. The cement content in the concrete can be partially replaced with waste materials like steel fibers, silica fumes, etc. Calculating compressive strength in a laboratory takes huge amount of time, manpower, cost and produces a large amount of wastage. Apart from the constituents of concrete, the compressive strength also depends on various factors such as temperature, mixing, types of aggregate, and quality of the water. The analytical models failed to deal with difficult problems. Artificial intelligence has enough capabilities to deal with such kind of complex problems. In this work, an artificial neural network (ANN) based model has been developed to predict the compressive strength of steel fiber and silica fumes-based concrete. The R-value of the developed model is 0.9948 and the mean absolute percentage error is 5.47%. The mean absolute error and root mean square error of the proposed model is 1.73 MPa and 6.89 MPa, respectively. The developed model is easy to use and reliable to estimate the compressive strength of concrete incorporating silica fumes and steel fibers. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Steel fibers

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Machine learning in concrete science:applications,challenges,and best practices

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npj Computational Materials 2022年第1期8卷 1192-1208页

作者： Zhanzhao Li Jinyoung Yoon Rui Zhang Farshad Rajabipour Wil V.Srubar III Ismaila Dabo Aleksandra Radlińska Department of Civil and Environmental Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang-si10223Republic of Korea Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCO80309USA Materials Science and Engineering Program University of Colorado BoulderBoulderCO80309USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Concrete,as the most widely used construction material,is inextricably connected with human *** conceptual and methodological progress in concrete science,concrete formulation for target properties remains a challenging task due to the ever-increasing complexity of cementitious *** the ability to tackle complex tasks autonomously,machine learning(ML)has demonstrated its transformative potential in concrete *** the rapid adoption of ML for concrete mixture design,there is a need to understand methodological limitations and formulate best practices in this emerging computational ***,we review the areas in which ML has positively impacted concrete science,followed by a comprehensive discussion of the implementation,application,and interpretation of ML *** conclude by outlining future directions for the concrete community to fully exploit the capabilities of ML models.

关键词： concrete directions autonomous

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Acoustoelastic effect for estimation of stress and dependency of amplitude of an ultrasonic pulse wave in a uniaxially stressed concrete member

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Insight: Non-Destructive Testing and Condition Monitoring 2025年第5期67卷 289-296页

作者： Joshi, Aayush Jain, Kranti Chourasia, Ajay Department of Civil Engineering Women Institute of Technology Uttarakhand Dehradun248001 India Department of Civil Engineering National Institute of Technology Pauri Garhwal Uttarakhand Srinagar246174 India Structural Engineering Division Central Building Research Institute Uttarakhand Roorkee India

The non-destructive evaluation of concrete structures using ultrasonic waves is an important tool in structural health monitoring (SHM). It can be used to assess the homogeneity, uniformity, integrity and stress state of a concrete member. The latter is dependent on a phenomenon called the acoustoelastic effect, which relates the stress state of a material to the pulse velocity;however, the amplitude of a wave is also highly stress dependent. This paper presents an experimental study to quantify the increase in ultrasonic wave amplitude when the concrete element is subjected to compressive stress. Experimental investigations were conducted using an extended set-up consisting of a universal testing machine (UTM) and advanced ultrasonic testing equipment, where concrete specimens were subjected to varying stress levels while the changes in ultrasonic wave velocity and amplitude were monitored. The velocity exhibited a linear increase with applied stress, with a maximum change of approximately 4%. Conversely, the amplitude of the ultrasonic pulse increased linearly by up to 100% of its initial value under stress. As the system approached failure, there were rapid fluctuations in amplitude, which could be interpreted as an early indicator of impending failure. © 2025 British Institute of Non-Destructive Testing. All rights reserved.

关键词： Ultrasonic velocity

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Postbuckling Echoes of iMRA Introduced Variation in Gridshells Mechanical Behaviour 2nd

Postbuckling Echoes of iMRA Introduced Variation in Gridsh...

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2nd Italian Workshop on Shell and Spatial Structures, IWSS 2023

作者： Melchiorre, Jonathan Bazzucchi, Fabio Manuello Bertetto, Amedeo Marano, Giuseppe Carlo DISEG Department of Structural Geotechnical and Building Engineering Politecnico di Torino Corso Duca Degli Abruzzi 24 Turin10128 Italy Senseable City Lab Massachusetts Institute of Technology CambridgeMA United States College of Civil Engineering Fuzhou University Fuzhou350108 China

ISBN: (纸本)9783031443275

The collapse of a structure serves as a profound testament to its design quality. Forensic studies in structural engineering have revealed that collapses are intricate events with various interconnected metrics. The introduction of resilience and robustness concepts has revolutionized structural engineering, surpassing the conventional approach of designing for maximum load. This paradigm shift is especially crucial for shells and membranes. Postbuckling investigation emerged as a significant area of study since 1970, offering insights into shell design and stability. This paper focuses on the effect of the improved Multibody Rope Approach (i-MRA) for form finding on the postbuckling behaviour of gridshell structures. The i-MRA exhibits superior postbuckling behaviour, which directly relates to the method’s underlying mechanics. The investigation centres around the mosque roofing in Dakar, Senegal. A comprehensive analysis was conducted, encompassing linear buckling analysis and geometrically nonlinear analysis with imperfections (GNIA) under incremental loading. The study successfully captured crucial insights into the behaviour of the structure throughout both the buckling and postbuckling phases. Additionally, a standard square-plan gridshell was analyzed to validate the findings and evaluate their generality. The research findings demonstrate the efficacy of the i-MRA and provide valuable insights for the design and stability assessment of gridshell structures. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Buckling

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A state-of-the-art review on recent advances in the fabrication and characteristics of magnesium-based alloys in biomedical applications

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Journal of Magnesium and Alloys 2024年第7期12卷 2569-2594页

作者： Fatemeh Zahra Akbarzadeh Masoud Sarraf Erfan Rezvani Ghomi Vishnu Vijay Kumar Mojtaba Salehi Seeram Ramakrishna Sungchul Bae Department of Materials Engineering Babol Noshirvani University of TechnologyShariati Ave.Babol 47148-71167Iran Deputy Vice Chancellor’s Office(Research&Innovation) University of MalayaKuala Lumpur 50603Malaysia Center of Advanced Manufacturing and Material Processing Department of Mechanical EngineeringFaculty of Engineering University of MalayaKuala Lumpur 50603Malaysia Department of Mechanical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Center for Nanotechnology and Sustainability Department of Mechanical EngineeringNational University of SingaporeSingapore 117581Singapore Lee Kong Chian School of Medicine Nanyang Technological University SingaporeClinical Sciences Building11 Mandalay RoadSingapore 308232Singapore Structural Engineering Division of EngineeringNew York University Abu Dhabi(NYUAD)PO Box 129188 Abu DhabiUnited Arab Emirates International Institute of Aerospace Engineering&Management JAIN(Deemed-to-be-university)JGI global campusBangalore562112India Additive Manufacturing Division Singapore Institute of Manufacturing Technology(SIMTech)Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech Loop 636732Singapore Department of Architectural Engineering Hanyang UniversitySeoulSouth Korea

Magnesium(Mg)and its alloys have recently gained increasing attention in the biomedical field as promising biodegradable materials with harmless degradation ***-based alloys have a wide range of biomedical applications because of their outstanding biocompatibility and unique mechanical *** use of Mg-based biomedical devices eliminates the need for post-healing biomaterial removal surgery and minimizes the negative consequences of the implantation of permanent biomaterials,including stress shielding and undesired metal ion release in the *** paper provides a literature review on the properties and manufacturing methods of Mgbased alloys for biomedical applications,including orthopedic implants,cardiovascular applications,surgical wires and staplers,and antitumor *** application of Mg-based biomaterials is investigated from a biological perspective,including matching functional properties,biocompatibility,host tissue responses,and anti-microbial strategies,along with potential additive manufacturing technologies for these ***,an outlook is presented to provide recommendations for Mg-based biomaterials in the future.

关键词： Mg-based alloys Biocompatibility Anti-microbial strategies Additive manufacturing Mg implants

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Energy Performance Analysis of building Envelopes

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Journal of engineering, Project, and Production Management 2021年第3期11卷 196-206页

作者： Motawa, Ibrahim Elsheikh, Asser Diab, Esraa Structural Engineering Department Mansoura University Elgomhouria St. Mansoura35516 Egypt Russia Building and Construction Engineering Department Tanta Higher Institute for Engineering and Technology El-Gharbia Tanta Egypt

The building sector has a high level of energy consumption caused mainly by the buildings heating and cooling energy demands to satisfy indoor comfort requirements. Reducing both the amount of energy consumed and the life cycle cost is a main challenge for the construction of buildings. It is evident that sustainable materials have low environmental impacts and need low consumption of energetic resources in addition to their durability and recyclability. Therefore, this research aims to test different sustainable materials available in Egypt for the construction of building envelopes that include local stones "Marble and Limestone"and insulation materials "Polyurethane-expanded and Extruded polystyrene (XPS) foam"in order to achieve savings in energy and total life cycle cost. The simulation tests were conducted through Design Builder software. The results aim to provide solutions for building designers to achieve energy-efficiency and costeffective design. The proposed alternatives showed a significant reduction in energy consumption by up to 62% and the total life cycle costs significantly reduced by up to 45.8%. © 2021 Ibrahim Motawa et al., published by Sciendo 2021.

关键词： Life cycle

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Morphology of cracks and comparison of load-bearing capacity of joints of AAC masonry walls

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ce/papers 2023年第2期6卷 125-133页

作者： Galman, Iwona Jasiński, Radoslaw Department of Structural Engineering Silesian University of Technology Gliwice Poland Department of Building Structures Silesian University of Technology Gliwice Poland

structural problems of wall joints in masonry structures are often neglected. This has its historical justification: with the traditional binding of the walls and relatively durable walls, the damage was rare. Currently, with the constant striving to simplify the structure, the introduction of new technologies and materials, damage and failures are becoming commonplace. Replacing the traditional masonry bond with fasteners significantly affects the operation of the entire structure and its possible cracking. The paper presents the results of experimental tests of wall joints made of autoclaved aerated concrete (AAC) masonry elements. Reference models consisting of two wall panels connected perpendicularly with a traditional masonry bond and models with the same geometry but with a modified connection method—using various types of connectors popular on the market (plates, rods, nets) were tested. The shape and size of the research models and the construction of the test stand were determined on the basis of the analysis of current knowledge, pilot studies and FEM numerical analyses. The mechanisms of cracking and damage as well as the behavior of different types of fasteners were compared. The analyses concerned load-bearing capacity and the morphology and damage mechanism of the models. © 2023 Ernst & Sohn GmbH.

关键词： Walls (structural partitions)

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Shear capacity of traditional joints between walls made of AAC masonry units

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ce/papers 2023年第2期6卷 119-124页

The article presents the synthesis of the results of tests performed on unreinforced joints of walls made of autoclaved aerated concrete. The shape of the research element and the testing set up were innovatively designed based on the own research, literature review and numerical analyses. The article discusses the morphology of cracks and the mechanism of failure as well as the load–deflection relationship of the unreinforced joints made with traditional masonry bond. The individual work phases of the joints were specified and the rigidity of the joint was calculated. Using standardized procedures, parameters for the design of the joints were given. The obtained results encourage further analyses on the detailing of the joints and applications of new methods in the construction of the joints. © 2023 Ernst & Sohn GmbH.

关键词： Concrete testing

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