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

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Predicting the Compressive Strength of Recycled Aggregate Concrete Based on Artificial Neural Network 6th

Predicting the Compressive Strength of Recycled Aggregate Co...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Hai-Bang Ly Univ Transport Technol Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

Recycled aggregate concrete (RAC), where recycled concrete aggregates replace natural ones, has received increased attention over the past decades, and appears as a promising technology for conserving natural resources, reducing the environmental impact of concrete. However, the complexities in the mixture optimization of RAC, due to the variability of recycled aggregates and lack of accuracy in estimating the compressive strength, require novel and sophisticated techniques. This study aims at developing a machine learning model, based on neural networks, to predict the RAC compressive strength. The RAC database in this investigation is constructed from the available literature, divided into two parts, namely the training and testing parts. Well-known statistical indicators, namely the correlation coefficient (R), root mean square error (RMSE), absolute mean error (MAE), and mean absolute percentage error (MAPE) are used to evaluate the performance of the proposed machine learning model. The results indicate that the outputs of the proposed model are in good agreement with the experimental compressive strength values, and may be helpful for engineers to save time, as well as avoiding costly experiments.

关键词： Recycled aggregate concrete Artificial neural network Compressive strength

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Establishing the Indicators of Sustainable Building Materials 6th

Establishing the Indicators of Sustainable Building Material...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Moghayedi, Alireza Le Jeune, Karen Massyn, Mark Byron, Paimaan Univ Cape Town ZA-7700 Cape Town South Africa Natl Dept Publ Works & Infrastruct ZA-0001 Pretoria South Africa

ISBN: (纸本)9789811671609;9789811671593

Sustainable building materials are products with a relatively positive impact on economies, communities and the environment. Understanding the key indicators in developing sustainable building materials, which affect the economic, social and environmental aspects of buildings, is a critical perspective to aid their evolution. Research in sustainable building materials is relatively new, and therefore this study examined the existing literature on sustainable building materials in academic journals with the intent of identifying and clustering key indicators and proposing a conceptual framework for the development of sustainable building materials. This study employed a verifiable and reproducible systematic literature review of building materials, analyzing and scrutinizing 203 academic articles for the cooccurrence of keywords, using a mixed bibliographic and bibliometric method. It emerged from the study that the groups themed "Process", "Material", "Element" and "Technology" contained the greatest number of, and most statistically significant, indicators associated with sustainable building material. It was found that, in developing and evaluating sustainable building materials, sustainability, LCA (Life Cycle Assessment), embodied energy and recycling appear to be the predominant processes used;concrete, bricks, C&D (Construction and Demolition) waste, and fibre are the foremost materials;walls and roofs are the main building components;and composite, 3D printing, nanotechnology and prefabrication are the leading technology features. Also, the results of the analysis of interconnections between indicators revealed that a significant interconnection exists between embodied energy, LCA, concrete, composite and durability to the sustainability of building materials. Based on the taxonomy of indicators and the analysis of their interconnections, a conceptual framework for developing sustainable building materials was proposed in the paper.

关键词： Bibliometric analysis Building element Building material Sustainable building materials Technology

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Design and Analysis of Damage-Free Self-centring Links for Seismic-Resilient Eccentrically Braced Frames 10th

Design and Analysis of Damage-Free Self-centring Links for S...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Lettieri, Annarosa Latour, Massimo Moderini, Leo Kauntz Freddi, Fabio Rizzano, Gianvittorio Univ Salerno Salerno Italy UCL London England

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Earthquake resilient steel frames, such as Self-Centring Moment Resisting Frames (SC-MRFs) or Concentrically Braced Frames (SC-CBFs), have been widely studied during the past few years while little attention has been paid to the development of self-centring solutions based on Eccentrically Braced Frames (EBFs). The present paper investigates a possible solution for damage-free self-centring EBFs relying on the use of a damage-free self-centring devices as seismic link. The device uses post-tensioned high-strength steel bars with disks springs to control the self-centring behaviour and friction devices to dissipate seismic energy. A four-storey EBF is designed according to the Eurocode 8 and the third storey of the structure is extracted to investigate the behaviour of a sub-assembly upgraded with the proposed seismic device. A 3D nonlinear finite element model of the device is developed in ABAQUS to evaluate the local behaviour. The results of the conventional and upgraded systems are compared, showing the effectiveness of the solution.

关键词： Steel structures Eccentrically braced frames Damage-free self-centring links Structural resilience Residual drifts

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Analytical Model for Predicting the Torsional Capacity of Thin Walled Tubular RC Beams Strengthened with NSM CFRP Laminates 10th

Analytical Model for Predicting the Torsional Capacity of Th...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Gowda, Chandan Barros, Joaquim Guadagnini, Maurizio Univ Minho Campus Azurem P-4800058 Guimaraes Portugal Univ Sheffield Sheffield S1 3JD S Yorkshire England

ISBN: (纸本)9783030881665;9783030881658

An analytical model to predict the torsional moment capacity and the type of failure of thin walled tubular reinforced concrete elements strengthened with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) laminates is proposed. The model implements the thin walled space truss analogy, which forms the basis of current design codes, and evaluates the torsional capacity as a combination of the resistance offered by the transverse steel reinforcement and CFRP laminate reinforcement. The contribution of the steel reinforcement is limited by its yield strength and that of the CFRP laminates by an effective maximum strain. The model also implements the modified compressive field theory to evaluate the concrete compressive strut inclination. The predictive performance of the developed model is compared against available models and assessed against experimental data obtained within the current research project and available in the literature. The model predicts the failure type and the ultimate torsional capacity with an error of 2.4% (with Co.V. of 5.1%) for current experimental research and 7.2% (with Co.V. of 8.6%) for other literature data.

关键词： Torsional strengthening Near surface mounted (NSM) Carbon fiber reinforced polymers (CFRP) Analytical model Space truss analogy

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Element of the Coastal Disaster Risk Information System, Taking into Account engineering and Socio-economic Applications 6th

Element of the Coastal Disaster Risk Information System, Tak...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Moskvitin, Alexander Shabramova, Ludmila Zaytsev, Andrey Pelinovsky, Efim Russian Acad Sci Special Res Bur Automat Marine Res Far Eastern Branch Yuzhno Sakhalinsk Russia Russian Acad Sci Inst Appl Phys Nizhnii Novgorod Russia

ISBN: (纸本)9789811671609;9789811671593

The main result of this work is the developed elements and prototypes of the information system of coastal risks associated with natural disasters. To do this, an analysis of past natural disasters was carried out, as well as possible events in the future were evaluated. Flood zones caused by these events and hydrodynamic impact on the shore were calculated. Risk maps, including escape routes, are based on these calculations. This research work was carried out for several coastal points of the Sakhalin region of Russia.

关键词： Long waves disaster mitigation Numerical simulation Inundation zone Coastal risks

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Probabilistic Risk Assessment of an Existing RC Building Strengthened with Steel Bracings 10th

Probabilistic Risk Assessment of an Existing RC Building Str...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Korkmaz, Kasim A. Eastern Michigan Univ Ypsilanti MI 48197 USA

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Turkey is one of the earthquake-prone countries that experienced strong earthquakes in 1999. The last devastating earthquake hit Northwest part of the country, called as Marmara Earthquake, close to Istanbul. After these experienced earthquakes, various strengthening techniques have been applied to increase the seismic response of existing buildings against earthquake loads in seismically prone regions. These techniques aim to improve the lateral resistance of existing buildings by adding new elements such as steel bracing or shear walls. Braced members are one of the widely used approaches and practices for fast responses. They are used to increase the structural capacity under earthquake loads. The present study investigates a real, existing 7-story reinforced concrete (R/C) building located in Istanbul, Turkey as a case study. With seismic assessments, strengthening for existing buildings with steel bracings was evaluated. The selected building was designed according to the 1975 Turkish Seismic Code and strengthened according to the current 2007 Turkish Design Code. The construction of strengthening is currently completed, and the building is occupied in one of the high demanding regions in Istanbul, Turkey. Steel bracings were preferred to strengthen the project to gain the usage area. Strengthening with steel bracing also decreased disturbance faster than other supporting methods. The research determined the nonlinear structural behavior of a representative existing and strengthened reinforced concrete (R/C) building. Pushover curves were plotted for the existing and strengthened building models. Lateral displacements, story displacements, and plastic hinge rotations were calculated for the building. Then, probabilistic risk assessment was carried out by plotting the probability of exceedance curve for the building.

关键词： Strengthened R/C buildings Strengthening by steel bracing Earthquake resistance Probabilistic risk assessment

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Effect of Tack Coat Application Rate and Temperature on Interlayer Cohesion and Friction of Double-Layer Asphalt Samples 6th

Effect of Tack Coat Application Rate and Temperature on Inte...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Bui Thi Quynh Anh Univ Transport Technol Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Lack of tack coat application will not ensure the bonding and continuity of the asphalt pavement layers. However, excess of its application can reduce the friction at the interlayer causing slipping. On the other hand, bituminous tack coat material is very sensitive to temperature changes. The fluctuations in temperature can change the interface adhesion ability. Therefore, it can be said that the interface shear resistance characteristics including interlayer cohesion and friction depended much on the temperature on the tack coat application rate. The paper presents the experimental results on the influence of temperature (25, 40, 60 degrees C) and rate of tack coat CRS-1 (0, 0.2, 0.5, 0.8 l/m(2)) on the interlayer cohesion and friction between asphalt layers. The results show that the maximum shear resistance is obtained at the rate of 0.2 (l/m(2)), and the lowest is for the case of 0.8 (l/m(2)). Besides, the temperature increases, the interlayer cohesion dramatically decreases while increasing the friction coefficient [except for the case of 0.8 (l/m(2))].

关键词： Tack coat rate Temperature Interlayer Cohesion Friction Shear Asphalt

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Finite Element Modeling and Statistical Analysis of Fire-Damaged Reinforced Concrete Columns Repaired Using Smart Materials and FRP Confinement 10th

Finite Element Modeling and Statistical Analysis of Fire-Dam...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Hussain, Iqrar Yaqub, M. Mortazavi, Mina Ehsan, M. Adeel Uzair, M. UET Taxila Dept Civil Engn Taxila 47080 Pakistan UTS Sch Civil & Environm Engn Sydney NSW Australia

ISBN: (纸本)9783030881665;9783030881658

Practical testing for observing the failure modes is expensive, time consuming and often limits the pace of research progress. Moreover, because of the limitations of equipment, the existing structures cannot be tested at ultimate failure and scale effect is not observed on large scale experimentally. Thus, numerical modeling and statistical analysis is required for prediction of the behavior of fire damaged and fire-damaged repaired structures. This Paper explores the regression models and Finite element studies to predict the load-deformation response of bolstered concrete columns, damaged through exposure to heat at 300 degrees C, 500 degrees C and 900 degrees C, strengthened using smart materials and confined by carbon fiber reinforced polymers. Using software ABAQUS, a numerical model was developed, capable of predicting the axial load-deformation performance of undamaged, fire damaged and fire-damaged reinforced columns repaired by employing various confinement techniques. SPSS Software was used for Regression modeling (Linear, multiple, and Quadratic). The obtained results showed that regression equations and numerical modeling offered a better alternative to the experimental methods. High correlation coefficient r and coefficient of determination r(2), more than 90%, for all developed equations, confirmed it as an excellent fit statistical model for prediction of axial load capacity and axial deformation. Similarly, the response predicted by numerical modeling showed minor difference i-e less than 10% with that of experimental. Thus, it can be concluded that, the numerical modeling and prediction formulae agree quite with the experimental results and can be used as alternatives for prediction of loads and deformations.

关键词： Fire-damaged columns Smart construction materials Numerical modeling Regression modeling Abaqus SPSS

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Moisture Influence on the Shakedown Limit of a Tropical Soil 4th

Moisture Influence on the Shakedown Limit of a Tropical Soil

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Serra, Gleyciane Almeida Rodrigues Guimaraes, Antonio Carlos Soares Marques, Maria Esther Castro, Carmen Dias da Rosa, Artur Cortes Mil Inst Engn 80 Praca Tiburcio Rio De Janeiro Brazil

ISBN: (纸本)9783030772383;9783030772376

This paper presents results from permanent deformation tests carried out on fine tropical soils in order to study the effect of moisture variation. Shakedown limit was defined through repeated load triaxial tests under different stress states for 5000 load cycles. A mathematical model to classify permanent deformation behavior proposed by Werkmeister (Doctoral thesis, Technical University of Dresden [Werkmeister S (2003) Permanent deformation behavior of unbound granular materials in pavement constructions. Doctoral thesis. Technical University of Dresden, 189 pp]) was used to rank the shakedown limit of the materials. In this research, a lateritic clayey soil, according to the classification MCT (Miniature, Compaction, Tropical) from Nogami and Villibor (Brazilian Simposium of Tropical Soils in engineering. Rio de Janeiro, RJ, pp 30-41, [Nogami JS, Villibor DF (1981) Uma nova classificacao de solos para finalidades rodovia-rias. In: Brazilian simposium of tropical soils in engineering, Rio de Janeiro, RJ, pp 30-41]), was tested in the optimum content and at the high moisture induced by capillary post-compaction. The resilient behavior was studied to characterize the mechanical behavior of the material. The results of permanent deformation tests showed that fine tropical soils may have a nonsignificant reduction of their shakedown limit, with the increase moisture of 1%. The proposed model showed a good agreement for this tropical soil at an optimum moisture. The understanding of the shakedown phenomenon from tropical soils may help to bridge the gap between the materials accepted by traditional classification and those not accepted, although they present good mechanical resistance.

关键词： Shakedown theory Permanent deformation of soils Lateric tropical soils

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Numerical Study on Seismic Performance of High-Strength CFST Frame Structure with Aluminium Alloy Core Assembled Buckling-Restrained Braces 10th

Numerical Study on Seismic Performance of High-Strength CFST...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Li, Guochang Wei, Lirong Shenyang Jianzhu Univ Sch Civil Engn Shenyang Peoples R China

ISBN: (纸本)9783031038136;9783031038112;9783031038105

In this paper, a high-strength CFST-steel beam frame structure with aluminium alloy core assembled buckling restrained braces (HSC-SB-ALAB) was proposed and the brief design method for HSC-SB-ALAB were introduced. To study the influence of high-strength materials and ALAB on the seismic performance of the structure, four 10-story CFST-steel beam structures were designed with material strength and ALAB as variables. The numerical models of the four structures were established by OpenSees, and modal analysis, static elastic-plastic analysis, and dynamic time history analysis were carried out for them. The results indicate that high-strength materials and ALAB could significantly reduce the torsional effect of the structure. In the process of HSC-SB-ALAB failure, ALAB first yielded and began to dissipate energy, then the plastic hinge first appeared in some beams, and few plastic hinges appeared in columns until the later stage, which indicated that HSC-SB-ALAB has the expected yield mechanism. Under seismic load, HSC-SB-ALABhad the highest bearing capacity, and its inter-story drift ratio and story shear were the minimum of the four models. At the same time, HSC-SB-ALAB had the least damage and milder stiffness degradation. It was verified that HSC-SB-ALAB improved the seismic performance of CFST-steel beam frame structures, and the effect of high-strength materials was greater than ALAB.

关键词： High-strength materials BRB CFST Seismic performance Numerical simulation

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