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

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Multiscale Reinforcement of Epoxy Composites with Glass Fibre and Carbon Nanotube 10th

Multiscale Reinforcement of Epoxy Composites with Glass Fibr...

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

作者： Hidayah, I. Nurul Mariatti, M. Univ Sains Malaysia Sch Mat & Mineral Resources Engn Engn Campus Nibong Tebal 14300 Pulau Pinang Malaysia

ISBN: (纸本)9783030881665;9783030881658

This paper presents an investigation on the modification of macro-scale fibre reinforcement with nano-scale filler to produce multiscale glass fibre reinforced polymer (GFRP) composites. Glass fibres were spray-coated with multi-walled carbon nanotube (MWCNT) aqueous suspension and were stacked together with epoxy binder to produce composite laminates by using hand lay-up method, followed by vacuum bagging. The stability of MWCNT aqueous suspension was analysed using zeta potential and UV-Vis and the distribution of MWCNT on the glass fibre was examined using scanning electron microscope. To evaluate the mechanical performance, flexural test and short beam test were performed. Improvement by 53.6% and 74.8% was observed in flexural strength of the 5-ply glass fibre (5GF) composites incorporated with 0.1 and 0.5 wt% of MWCNT, respectively. Meanwhile, flexural modulus of the same composites showed more than 20% improvement at both MWCNT concentrations. For interlaminar shear strength (ILSS), the highest improvement was found to be at 0.5 wt% of MWCNT which increased ILSS of the multiscale composite by 43.8% compared to the control sample (5GF). It is also interesting to note that 6-ply glass fibre (6GF) composite had lower flexural properties and ILSS in comparison to 4-ply glass fibre (4GF) and 5GF multiscale composites incorporated with MWCNT, indicating that we successfully reduced the weight of the GFRP composites by reducing the glass fibre ply but significantly enhanced their mechanical performance.

关键词： Glass fibre Carbon nanotube Multiscale composite Flexural Short beam

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Impact of the 4.0 Industrial Revolution on the Construction Industry in Malaysia 1

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5th International Conference on Architecture and civil engineering 2021 (ICACE)

作者： Vasudevan, Gunalaan Ming, Wong Wei Tunku Abdul Rahman Univ Coll Malaysia Fac Built Environm Dept Construct Management Kuala Lumpur Malaysia

ISBN: (数字)9789811686672

ISBN: (纸本)9789811686672;9789811686665

This paper discusses the impact of the 4.0 Industrial Revolution on the Malaysian construction industry, which has been evolving since the 1980s. This research seeks to investigate and understand the increasing awareness for a comprehensive change in the social needs in the modern construction industry. One hundred respondents completed the questionnaire for this study and the results were analyzed and tabulated using the SPSS system. Most respondents agreed or strongly agreed that they look forward to Malaysia adopting the industry 4.0 technologies in the near future. Most respondents have a positive mindset and provided positive feedback. A strategic construction knowledge in the application of Industry 4.0 technologies can ensure a better future and benefit the construction industry in Malaysia. Presently, the impact of industry 4.0 on the Malaysian construction industry is still in its early stage relative to other countries. Proper utilisation of industry 4.0 technologies will take the Malaysian construction industry to the next level.

关键词： 4.0 Industrial Revolution Construction industry Strategic construction

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RC Columns Upgrade: Opportunities Given by FRP and Potential of FRCC Systems 10th

RC Columns Upgrade: Opportunities Given by FRP and Potential...

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

作者： Del Zoppo, Marta Di Ludovico, Marco Balsamo, Alberto Prota, Andrea Morandini, Giulio Univ Naples Federico II Dept Struct Engn & Architecture Naples Italy Struct Strengthening Line Mapei SpA Milan Italy

ISBN: (纸本)9783030881665;9783030881658

Fiber Reinforced Polymer (FRP) composites have been widely used in past decades for the seismic upgrading of sub-standard reinforced concrete (RC) members and their effectiveness as a suitable strengthening technique for such kind of structural components has largely been proved. However, some concerns still arise with the effectiveness of such composite materials at high temperature, such as in the case of fire exposure. Furthermore, the use of FRPs requires a minimum quality for the concrete substrate to avoid undesirable premature failure mechanisms. Usually, the replacement of the poor quality or damaged concrete cover of existing members with a new one is needed before the strengthening intervention. Current research is now moving towards the adoption of inorganic composite materials, such as Fiber Reinforced Cementitious Composite (FRCC), for repairing existing RC buildings and infrastructures as a replacement of the original concrete cover, due to its good durability properties and resistance to high temperature. The present study discusses the possibility of adopting such FRCC jacketing also for the seismic upgrading of existing shear critical RC columns. The experimental performance of RC columns strengthened with FRCC jacketing subjected to cyclic lateral loading and different axial load ratios is analyzed herein, and the experimental performance of FRCC and FRP jacketed columns is compared to point out the effectiveness of both retrofit solutions.

关键词： FRP jacketing FRCC jacketing Shear strengthening Seismic retrofit Durability

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Local Perspectives on Green Resilient Settlements in Pakistan 6th

Local Perspectives on Green Resilient Settlements in Pakista...

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

作者： Rayan, Muhammad Khayyam, Umer Gruehn, Dietwald TU Dortmund Sch Spatial Planning Chair Landscape Ecol & Landscape Planning LLP Dortmund Germany Natl Univ Sci & Technol NUST Sch Social Sci & Humanities S3H Dept Dev Studies Islamabad Pakistan

ISBN: (纸本)9789811671609;9789811671593

The wave of climatic hazards has hampered countries green infrastructure planning. As a countermeasure, Urban Green Infrastructure (UGI) modelling has emerged as an adaptation strategy to enhance the resilience of the urban areas to fight the potential effects of climatic risks. It protects and improves the urban eco-system, human health and wellbeing, like in the Khyber Pakhtunkhwa (KP) province of Pakistan. This research aimed to determine sustainable UGI planning indicators based on local stakeholder's perspectives. It is to develop a UGI indicatorbased framework for climate-resilient urbanization. The results of the online expert's survey were based on 172 questionnaires. The relative importance index (RII) and interquartile range technique (IQR) were utilized to examine the data. The result shows a very good level of coefficient alpha (alpha) value, higher than alpha= 0.7, which is an acceptable threshold level (Cortina in J. Appl. Psychol., 1993;Peterson in J. Consum. Res., 1994). Furthermore, in this paper, we acknowledge key green elements, that have achieved RII value >= 0.75. This performs a pivotal role in quality improvement and strengthening the health of the respective UGI indicators. This study calls for building a new cultural paradigm in the KP region that supports green growth development to naturally minimize the vulnerability to urban flooding hazards and disastrous impacts on the ecosystem functions, and human well-being.

关键词： Climate change Adaptation Green infrastructure Urban eco-system Pakistan

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Retrofit of Damaged RC Columns Using CFRP Jackets 10th

Retrofit of Damaged RC Columns Using CFRP Jackets

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

作者： Moretti, Marina L. Miliokas, Evangelos Paparizos, Ioannis Natl Tech Univ Athens Sch Architecture Athens Greece Univ Thessaly Dept Civil Engn Volos Greece

ISBN: (纸本)9783030881665;9783030881658

This paper presents results of an experimental program undertaken to investigate the possibility of application of carbon fiber reinforced polymer (CFRP) jackets to reduce the risk of rebar buckling of axially loaded RC columns with circular or rectangular cross-section. Ten RC columns with height of 300 mm and three different cross-sections, i.e. circular of 150 mm diameter, and square of 100 mm and 150 mm side, with two ratios of stirrup spacing to longitudinal bar diameter, i.e. 7.6 and 11.7, are tested. Scaling of 1/3 was followed in general, also in the rebar diameter and the concrete mix. The specimens, after being tested under axial compression up to failure, were strengthened with CFRP jackets using wet lay-up process. The number of CFRP layers used in the jacket was determined in relation to the degree of damage the columns had suffered according to a damage scale that is introduced. The results of this work are encouraging towards the potential of using CFRP jackets in RC columns with sparsely spaced stirrups, both for strengthening of intact RC columns and also as a retrofit technique for RC columns with buckled longitudinal bars, e.g. after the event of an earthquake. This application may be extremely helpful for the retrofit of RC columns in earthquake prone areas in buildings that were not designed according to the modern code principles and therefore their stirrups are sparsely spaced.

关键词： CFRP RC columns Repair Rebar buckling Axial strength

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An Artificial Intelligence Approach Based on Multi-layer Perceptron Neural Network and Random Forest for Predicting Maximum Dry Density and Optimum Moisture Content of Soil Material in Quang Ninh Province, Vietnam 6th

An Artificial Intelligence Approach Based on Multi-layer Per...

引用

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

作者： Manh Nguyen Duc An Ho Sy Truong Nguyen Ngoc Thuy Linh Hoang Thi Univ Transport & Commun 3 Cau Giay St Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Maximum dry density (rho d((max))) and optimum moisture content (w(opt)) are two key parameters of embankment fill soil material using in transport construction. To obtain these parameters, Proctor test (ASTM D698/AASHTO) or Modified Proctor test (ASTM D1557/AASHTO T180 etc.) is traditionally performed in the laboratory. However, this test takes time and expenses. Moreover, the accuracy of the test depends significantly on the collection of samples, expertize of the testers and quality of the experimental apparatuses. In this study, the main aim is to propose two machine learning approaches named Multi-layer Perceptron Neural Network (ANN-MLP) and Random Forest (RF) for the prediction of.d( max) and wopt. Input parameters include silt content(%), clay content (%), liquid limit (%), plastic limit (%), plasticity index (%), specific gravity which have strong correlations with rho d( (max)) andw(opt) were used in themodel. Performance of themodelwas assessed by statistical methods, such as Mean Absolute Error (MAE), Root mean square error (RMSE), and Coefficient of determination (R-2). Results of the models study indicate that the proposed models ANN-MLP and RF has the same predictive capability (R-2 (average) of ANN-MLP is 0.829 and R-2 (average) of RF is 0.827). The results of this study might help in quickly predicting rho d(( max)) and w(opt) of embankment fill soil material.

关键词： Artificial intelligence Machine learning Neural network Random forest Maximum dry density Optimum moisture content Proctor test Soil material Vietnam

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Tensile Tests of FRCM Coupons: The Influence of the Fiber-Matrix Bond Properties 10th

Tensile Tests of FRCM Coupons: The Influence of the Fiber-Ma...

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

作者： Focacci, Francesco D'Antino, Tommaso Carloni, Christian Univ eCampus Fac Engn Novedrate CO Italy Politecn Milan Dept Architecture Built Environm & Construct Engn Milan Italy Case Western Reserve Univ Dept Civil Engn Cleveland OH 44106 USA

ISBN: (纸本)9783030881665;9783030881658

Fiber-reinforced cementitious matrix (FRCM) composites are usually mechanically characterized by means of tensile and bond tests. The load responses provided by tensile tests of FRCM coupons are typically constituted of three phases, namely the uncracked, cracking, and fully cracked phase. Tensile tests can be performed by either transferring the force to the matrix (clevis- or clamping-grip test) or to the bare fibers (direct gripping of the fibers). The bond behavior of FRCM composites is generally investigated using single-lap shear test setups, which allow for the evaluation of the stress-transfer mechanism within the matrix, at the matrix-substrate interface, and at the matrix-fiber interface. Within the framework of fracture mechanics, results of single lap shear tests allow a cohesive material law (CML) to be calibrated for the weaker interface that is activated during the test. In this paper, a polyp araphenylene benzo-bisoxazole (PBO) fiber-matrix CML calibrated by the authors in previous works is introduced in an analytical model of FRCM tensile tests in order to verify if it allows the cracking process to be accurately predicted. The model allows for the introduction of different boundary conditions reproducing the different tensile test setups listed above. In particular, the boundary conditions associated with the gripping of the bare fibers are employed in this work and the results of the model are compared with experimental results of tensile tests of the same FRCM composite employed to calibrate the CML.

关键词： FRCM composites Tensile response Cohesive material law Analytical model Cracking

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Assessment of CPT Data on Liquefaction Mitigation with Rammed Aggregate Piers® 4th

Assessment of CPT Data on Liquefaction Mitigation with Ramme...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Bal, E. Kurt Oner, L. Ozaydin, I. K. Edil, T. B. Sentez Insaat Istanbul Turkey Yildiz Tech Univ Istanbul Turkey Univ Wisconsin Madison WI USA

ISBN: (纸本)9783030772383;9783030772376

This paper presents the results of pre- and post-improvement cone penetration test (CPT) results executed at the site where Rammed Aggregate Pier (R) elements were used for the liquefaction mitigation. The effectiveness of these elements is attributed to the lateral pre-stressing that occurs in the matrix soil during construction and to the high strength and stiffness of the piers. The improvements provided by Rammed Aggregate Pier (R) elements mitigate liquefaction potential include (i) soil densification (ii) transferring a major portion of the seismically induced shear stresses from the soil to columns (iii) increasing the horizontal stress of the surrounding soil (iv) dissipation of excess pore water pressure. In the case history presented in this paper, the soil profile consisted of a thick hydraulic fill layer (characterized by silty, clayey sand) overlying sea bottom sediments of soft to medium stiff silty clay (CL) and medium stiff silty clay with sand (SM) down to almost 40 m depth which are underlain by a stiff to very stiff silty clay layer. Installation of 50 cm diameter Rammed Aggregate Pier (R) elements which are constructed by Impact (R) System construction procedures (bottom-feed dry displacement method) is aimed to mitigate liquefaction risk in the hydraulic fill layer and to limit settlements, by forming an improved soil crust of desired thickness at the surface. Rammed Aggregate Piers of 16 m length were installed in square and triangular patterns with 1.5 m and 1.7 m on-center spacing, respectively. CPT testing was performed before and after the installation of the piers. The results show that the additional densification and improvement in non-cohesive soils due to vibration and ramming during the pier construction has increased the safety factor against liquefaction by 2.5-3.0 times.

关键词： Impact (R) System Rammed aggregate pier (R) Liquefaction mitigation Cone penetration test (CPT)

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Seismic Behaviour and Design of Chevron Multi-tiered Concentrically Braced Frames 10th

Seismic Behaviour and Design of Chevron Multi-tiered Concent...

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

作者： Comeau, Christophe Cano, Pablo Imanpour, Ali Tremblay, Robert Polytech Montreal Dept Civil Geol & Min Engn Struct Res Grp Montreal PQ Canada Univ Alberta Dept Civil & Environm Engn Edmonton AB Canada

ISBN: (纸本)9783031038136;9783031038112;9783031038105

configuration for multi-tiered concentrically braced frames subjected to seismic excitations. A prototype two-tiered braced frame part of a single-storey building structure was designed using three different brace force scenarios for the roof beam and the intermediate strut. Columns were designed to resist the bending expected at the maximum anticipated storey drift. The lateral response of the frame was examined through nonlinear static and dynamic analyses. For all cases studied, frame lateral deformations tend to concentrate in the first tier, where brace buckling initiated first, due to the reduced tier lateral stiffness in the brace post-buckling range. The flexural action in the intermediate struts was engaged when a reduced force was used for tension-acting braces in design, limiting nonlinear response in braces. Finally, the frames exhibited stable inelastic response with limited residual deformations, as a result of the re-centring capacity provided by the strut acting in flexure.

关键词： Multi-tiered chevron braced frame Brace buckling Beam yielding

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Fast and Low Impact Retrofit Using Advanced Materials for a Diffused Seismic Risk Mitigation 10th

Fast and Low Impact Retrofit Using Advanced Materials for a ...

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

作者： Prota, Andrea Univ Naples Federico II Dept Struct Engn & Architecture Naples Italy

ISBN: (纸本)9783030881665;9783030881658

Existing reinforced concrete (RC) andmasonry structures (particularly buildings and bridges) may be affected by significant deterioration and often need to be upgraded mainly to stop and/or delay material deterioration or to meet the new mandatory seismic design requirements. Applications of advanced materials for retrofitting and upgrading existing structures have been rapidly grown in past years because of their several advantages with respect to traditional strengthening systems. In the case of buildings, seismic upgrading performed as prevention measure needs to meet the strict requirement of avoiding people to leave and so being compatible with the daily functions during works execution: therefore, this crucial aspect has to control the conceptual design of retrofit interventions. These remarks have introduced new challenges in the development of novel advanced materials-based strengthening solutions for the seismic upgrading of deficient existing buildings that can be applied wholly from the exterior of the building. The experimental validation of such solutions and the relevant calibration of reliable design formulations for future seismic risk mitigation strategies is the main focus of this work. This paper outlines the basic principles of advanced materials-based seismic upgrading strategies on existing RC and masonry structures in order to avoid the most common brittle and premature failure modes. An overview of different experimental investigations carried out over the last two decades at the Department of Structures for engineering and Architecture of University of Naples Federico II is presented. The experimental programs confirmed the effectiveness of such fast and low impact methodologies for the definition of design-oriented procedures for retrofit solutions based on advanced composite materials.

关键词： Seismic retrofit Fast and low impact interventions Innovative materials Resilient structures Seismic risk reduction

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