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

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Testing a GFRP-Reinforced Concrete Bridge Deck Using a New Rolling Load Simulator 10th

Testing a GFRP-Reinforced Concrete Bridge Deck Using a New R...

引用

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

作者： Tauskela, Laura Gao, Severus Fam, Amir Queens Univ Dept Civil Engn Kingston ON Canada

ISBN: (纸本)9783030881665;9783030881658

This paper investigates the behaviour of a full-scale slab-on-girder reinforced concrete (RC) bridge deck with two different types of internal reinforcement subjected to cyclic rolling loads. The overall dimensions of the deck were 15.24 m x 3.89 m x 0.21 m and the girder spacing was 3.05 m. One section of the deck had top and bottom grids of glass fibre reinforced polymer (GFRP) reinforcement and another had top and bottom grids of steel reinforcement, both designed according to the Canadian Highway Bridge Design Code (CHBDC). In this ongoing study, the bridge deck was subjected to cyclic loading using a novel Rolling Load Simulator (ROLLS) and the paper reports on the cycles completed to date, up to 3000 loading cycles. The stiffness degradation behaviour of the two different deck sections was monitored throughout the testing program using monotonic load tests at different cycling intervals. After 3000 stress loading cycles, the stiffness of the GFRP-reinforced and steel-reinforced sections was reduced by 35% and 28%, respectively. The GFRP-reinforced section experienced greater deflections and a larger decrease in flexural stiffness. The average maximum transverse reinforcement strain in the steel rebar under service load was 29% of yield strain while the GFRP bars were at 3.6% of their ultimate strain. The bridge deck will continue to be loaded up to 3M cycles to establish the fatigue performance of the two sections with different reinforcing materials.

关键词： Bridge deck GFRP Rolling load simulator Stiffness degradation

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Runoff Water Management on Karstic Terrain and Stability of Slopes and Foundations in Northern Spain 4th

Runoff Water Management on Karstic Terrain and Stability of ...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Collazos Arias, F. Mas Bahillo, J. C. Castro-Fresno, D. Rodriguez-Hernandez, J. Blanco-Fernandez, E. Castanon-Jano, L. Garcia-Sanchez, D. Hernando, I. Beltran Univ Cantabria Dept Transport Projects & Proc Santander Spain TECNALIA Parque Cientif & Tecnol Bizkaia C Geldo Edif 700 Derio 48160 Spain

ISBN: (纸本)9783030772383;9783030772376

This communication analyzes the latest experiences in slope and foundation drainage and runoff water management to improve resilience in roadway infrastructures. The actions resulted from temporary rain and adverse weather conditions during the months of January and February 2012 and 2013, which caused singular damage to several road slopes in Northern Spain. The objective of the repair was to restore road safety and road stability. Regarding runoff water, heavy rains cause loose and scattered stone movements along the slopes of the La Hermida Gorge and in the limestone rocky massifs that make up the Gorge. There are also many karst caves exiting that load their levels to the fullest and produce impressive waterfalls on the road. The energy of these waterfalls was dissipated, and the water curtain was channeled into the Deva River through an innovative solution. With regard to the drainage of slopes and foundations, the action carried out on the slope of the A-8 motorway includes its stabilization by biological engineering. All the actions presented in this article have proven to be valid throughout the last year of road operation. Furthermore, the monitoring system used in full-scale tests for dynamic barriers according to ETAG-27 is reliable to better understand the force transmission mechanism and also for future design purposes.

关键词： Slope Heavy rain Stability Drainage Foundation Resilience

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Observation on Landslide Occurrence by the Rise of Groundwater After Prolong Rainfall Event 5th

Observation on Landslide Occurrence by the Rise of Groundwat...

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

作者： Khalid, Nor Hazwani Nor Usman, Fathoni Omar, Rohayu Che Norhisham, Shuhairy Razad, Azwin Zailti Abdul Univ Tenaga Nas Jalan Ikram Uniten Kajang 43000 Selangor Malaysia

ISBN: (纸本)9789811686672;9789811686665

Landslide is one of the natural disasters that gained attention worldwide these days. The effects are not only limited to changes in topography but also cause fatality. Rainfall and groundwater are among the factors that contribute to landslide occurrence. This study focused on finding the possibility of groundwater increment after prolong rainfall events that might lead to landslide occurrence. Thus, slopes that have a landslide history located at three different locations were selected for rainfall and groundwater monitoring. After a year of observation, the longest time of prolonged rainfall was selected for further analysis. The study found that prolonged rainfall does not cause an increment to the groundwater level.

关键词： Prolong rainfall Groundwater Landslide Sandy-SILT

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Understanding Degradation of Fiber/Matrix Interface Under Environmental Effects Using Molecular Simulation 10th

Understanding Degradation of Fiber/Matrix Interface Under En...

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

作者： Wu, Chao Wu, Ruidong Tam, Lik-ho Beihang Univ Sch Transportat Sci & Engn 37 Xueyuan Rd Beijing 100191 Peoples R China

ISBN: (纸本)9783030881665;9783030881658

With promising mechanical properties, fiber reinforced polymer (FRP) composite has increasing applications in civil engineering, such as external strengthening material for building structures, and load-bearing component and internal reinforcement for new constructions. During intended service-life, the composite is inevitably exposed to changing environments with high levels of temperature, humidity, and ions, and the interfacial degradation between fiber and matrix becomes a critical problem, which leads to interfacial debonding and consequent composite degradation. In order to predict the long-term performance of composite material, it is important to understand the interfacial degradation between fiber and matrix under environmental effects. As a bottom-up approach, molecular dynamics simulation enables the molecular modeling of fiber/matrix interface and the simulation of molecular interactions occurred in local interfacial region, which contributes to the understanding of interfacial degradation under different environment exposures. In this work, recent research progress in understanding the environmental effects on the bonding degradation of fiber/matrix interface from a molecular level is presented. Based on the developed interface models, the variations of molecular structure and related degradation of interfacial properties under different environmental exposures are discussed, and the molecular interactions at the interface are investigated to explore the underlying mechanism. Furthermore, future research direction involving the development of fiber/matrix interface model for further characterization of the interfacial degradation is also provided.

关键词： Fiber reinforced polymer Fiber/matrix interface Degradation Environmental effect Molecular dynamics

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Inventory of Green RoofsWithin Edinburgh, Scotland 6th

Inventory of Green RoofsWithin Edinburgh, Scotland

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

作者： Miller, Kate Krivtsov, Vladimir Cohen, Laura Royal Bot Gardens Edinburgh 20a Inverleith Row Edinburgh EH3 SLR Midlothian Scotland

ISBN: (纸本)9789811671609;9789811671593

The integration of Green Roofs (GRs) within urban areas is widely recognised as being crucial for improving urban sustainability. Improvement is largely achieved through the creation of habitats to support urban biodiversity and via the restoration of ecosystem services, which are vital inmediating the impacts of climate change within highly developed areas. Unlike many European countries, Scotland does not currently have a mandatory policy on the inclusion of GRs in urban areas. Consequently, there is a distinct lack of available data on existing GRs in Scotland, which presents issues regarding the monitoring of climate adaptation strategies. The principal aim of this study was to conduct an inventory of GRs within the city of Edinburgh, to provide baseline data, to inform policy. Investigative methods used QGIS with satellite imagery to identify and record GR locations and properties, with findings subject to ground-truthing for verification. To date, survey findings have revealed a total of 83 existing GRs within Edinburgh, which is almost three times as many as reported by a Central Scotland Green Network study previously. The GRs appear to be largely concentrated in the city center where they provide a considerable contribution towards local biodiversity and alleviation of flood risks, as well as several other benefits. The existing GRs are predominantly located on commercial buildings indicating a growing buy-in from local businesses. The results of this study will be of use in future policy making in Scotland, as well as for further research on the resilience and ecosystem services provided by urban green infrastructure.

关键词： Green infrastructure Ecosystem services SuDS Urban environment Sustainable development Biodiversity Blue-green cities

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Experimental Study on the Bond Strength Between Reinforcement Bars and Concrete as a Function of Concrete Strength and Confinement Effect 6th

Experimental Study on the Bond Strength Between Reinforcemen...

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

作者： Xuan, Vinh Tran Manh, Hung Nguyen Trung, Hieu Nguyen Xuan, Dat Pham Vinh Univ Nghe An Vietnam Natl Univ Civil Engn Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

This paper presents the results of the experimental investigations on the influence of concrete strength, and confinement effect of different arrangements of hoops on the bond-slip relationship between reinforcing steel bars and concrete. The Pull-out tests according to the recommendations of RILEM CEB RC6 were conducted to determine the bond strength-slips relationship. A set of 27 specimens were prepared for the testing with two main parameters, including concrete strength and stirrup spacing. Based on the current test results, the effects of such variable of interest on the behavior of RC structural elements are discussed.

关键词： Bond strength Confinement effect Pull-out tests

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Experimental Investigation on Torsional Behaviour of Coconut/Steel Fiber Using Reinforced Concrete Beam

Experimental Investigation on Torsional Behaviour of Coconut...

引用

International Conference on Advances in Construction Materials and Management (ACMM)

作者： Mocharla, Rajesh Ramasubramani, R. SRM Inst Sci & Technol Dept Civil Engn Kattankulathur 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

This study examines and investigates the outcomes for coconut fiber/steel fiber concrete beams As compared to traditional concrete beams, which are applied to torsion. Four beams, two of them with coconut fiber/steel fiber concrete and another two of them with traditional concrete with manufactured sand were developed and tested. The research contains specific cracking features, pre-cracking performance including analysis, post cracking performance and evaluation, limited torsional reinforcing, torsional reinforcing, ductility, crack width and stiffness. These were noted that coconut shell concrete's torsional activity is compared with that of traditional concrete. Compared with ACI projection, Macgregor's proposed method is more cautious in measuring torsional resistance to deformation. And for calculating the ultimate torque force ACI projection are more moderate Contrasted to the Macgregor proposed formula. In this respect, Indian standard is also progressive, but it has been undervalued in comparison with ACI and the Macgregor constants. Reasonable torsional reinforcement for beams is required to ensure the beam does not failure to crack. The influence of 5, 10, 15, 20% fiber contents by mass of cement and fibers length of 13 mm is researched.

关键词： Coconut fiber Steel fiber Reinforcement Torsion Ductility Concrete Cracks

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Variation in Temperature-Induced Displacement Curvature of Prestressed Concrete Girders Deteriorated by Alkali-Silica Reaction 6th

Variation in Temperature-Induced Displacement Curvature of P...

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

作者： Tuan Minh Ha Fukada, Saiji Duc-Duy Ho Ho Chi Minh City Univ Technol HUTECH Ho Chi Minh City Vietnam Kanazawa Univ Kanazawa Ishikawa Japan Vietnam Natl Univ Ho Chi Minh City Ho Chi Minh City Vietnam

ISBN: (纸本)9789811671609;9789811671593

For a correct evaluation of structural damage properties, it is vital to recognize structural responses induced by structural damage from alterations due to environmental changes. This study examined the relationship between the ambient temperature variations and the changes in the curvature of displacement curves of full-scale girders, which were periodically experimented on in six months. The alkalisilica reaction (ASR) also deteriorated the girders during the monitoring period. As an outcome, the environmental temperature markedly altered the variations in the displacement curvature of the experimental girders. All curvature values inferred from measured data had positive relations with the environmental temperature. In addition, the regression model explained that the ambient temperature was not the only factor influencing the change in the displacement curvature. Besides, the linear regression line of the ASR-deteriorated girder had a lightly more significant inclination than that of the intact one in all measurements.

关键词： Fly ash PC girder Displacement curvature Temperature effect

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3-D Forward and Inverse Scattering Analyses for Cavity in Viscoelastic Media Using Convolution Quadrature Time-Domain Boundary Element Method 1

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4th International Conference on Numerical Modelling in engineering (NME)

作者： Takeda, Haruhiko Saitoh, Takahiro Hirose, Sohichi Gunma Univ Dept Civil & Environm Engn 1-5-1 Tenjin Kiryu Gunma 3768515 Japan Tokyo Inst Technol Dept Civil & Environm Engn Meguro Ku 2-12-1 Ookayama Tokyo 1528552 Japan

ISBN: (数字)9789811681851

ISBN: (纸本)9789811681851;9789811681844

In this research, forward and inverse scattering analyses for a cavity in 3-D viscoelastic media are presented. After the formulation for a forward analysis using the convolution quadrature time-domain boundary element method (CQBEM) for 3-D viscoelastodynamics is discussed, a linearized inverse scattering analysis based on the Born approximation for a cavity in 3-D viscoelastic media is introduced. The scattered wave forms in time-domain obtained by the CQBEM are transformed into those in frequency-domain, and their transformed data are utilized to reconstruct a cavity in 3-D viscoelastic media. Some numerical results for a cavity obtained by these forward and inverse scattering analyses are shown to validate the proposed methods.

关键词： Convolution quadrature time-domain boundary element method Viscoelastodynamics Inverse scattering analysis Born approximation

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Learning from Hanoi City's Ad Hoc Architecture for Housing Design and Urban Ecologies 6th

Learning from Hanoi City's Ad Hoc Architecture for Housing D...

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

作者： Nguyen, M. Arch Tuan Manh Hanoi Architectural Univ Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

The housing problem of Hanoi shares its similarity with other emerging cities in the region of Southeast Asia as well as other locations throughout Latin America and Africa, in its conflict between formal and informal developments as well as in its absorption of different colonized cultures. Yet it is different from those cities in that the different ideologies are not as clear-cut and are not isolated in separate segments of the city. Instead, the city represents a symbiotic relationship between indigenous knowledge and ideological urban planning processes. As the conventional top-down master plan struggles with urban growth, combined with increasing evidence that informal housing clusters provide advantages in quality of life, bottom-up, self-organizing housing strategies need to be considered. If the spontaneously built structures are synchronized with city planning and in tandem with the requirement of the natural system, then the future of more resilient cities could be secured. The prospective future of this speculation is to turn rigid planning methodologies into parametric, mutable processes, where citizens have freedom to create their ownspace according to newdesign guidelines of "kit of parts," by learning from the ad hoc strategies in housing spatial expansion, in a design framework that mimics self-organization in biological systems, where local actions lead to optimal goals of the whole. Moreover, turning the design from plan to process implies a better relationship between clients, designers, and contractors, where the role between them can be shifted and framed in a mass customization of the building industry.

关键词： Sustainability Informality Architecture Self organization Ad hoc strategies Urban ecology

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