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The Behavior of Recycled Concrete through the Application of an Isotropic Damage Model

Open Journal of civil engineering 2015年第3期5卷 339-351页

作者： Marcelo Pedreira da Silva Magno Teixeira Mota Anderson de Souza Matos Gadea Monica Batista Leite Koji de Jesus Nagahama Civil and Environmental Engineering Post-Graduate Program State University of Feira de SantanaFeira de SantanaBrazil

The main goal of this paper is to describe the mechanical behavior of the CDW recycled concrete in compression, using an isotropic damage model adapted to the variation of the replacement rate of natural aggregates by recycled ones. The isotropic model by Mazars was used as a constitutive equation for the CDW concrete and its adjustment parameters, A and B, were written as quadratic polynomials according to the aggregates replacement rate. The model was evaluated for conventional and recycled concretes. For the latter ones, the aggregates replacement ratios evaluated were 50% and 100%. The results show good approximation between the analytical and numerical values obtained with the adapted isotropic damage model and experimental concrete results for both compressive and flexural strength.

关键词： Recycled Concrete Construction and Demolition Waste Isotropic Damage Mazars Isotropic Model

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Bioclimatic Architecture in Warm Climates 1

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1000年

作者： Manuel Correia Guedes Gustavo Cantuaria

ISBN: (数字)9783030120368

ISBN: (纸本)9783030120351;9783030120382

This book provides a comprehensive, hands-on approach to bioclimatic building design in Africa. Bioclimatic design is at the core of urban sustainability, and is a critical issue in Africa, where “imported” building typologies are being used at an increasing pace, disregarding the local context and consequently causing damage to the environment, to the economy, and to the culture itself. This book provides a concise set of sustainable design guidelines to be applied in both new buildings and the refurbishment of old buildings, and integrates bioclimatic design strategies with other sustainability issues such as: cultural aspects, affordability, and urban planning. Chapters are fully illustrated with photographs and drawings and include best-practice examples and strategies making it accessible to engineers, architects, students and a broad range of professionals in the building industry.

关键词： Renewable and Green Energy Building Construction and Design Building Physics, HVAC Sustainable Development

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Structural assessment of composite seam-welded rectangular hollow columns

Structural assessment of composite seam-welded rectangular h...

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作者： Castanheira, Deborah Souza De Lima, Luciano Rodrigues Ornelas Da Silva Vellasco, Pedro Colmar Gončalves Da Nóbrega Tavares, Maria Elizabeth PGECIV Civil Engineering Post Graduate Program UERJ State University of Rio de Janeiro Rio de Janeiro Brazil Structural Engineering Department UERJ State University of Rio de Janeiro Rio de Janeiro Brazil

Structural elements made of seam-welded hollow sections are considerably less expensive than their seamless equivalents. This is a strong incentive for their use, but the current steel design standards still contain recommendations for seam-welded hollow sections based on test results performed with sections produced using outdated steel grades and fabrication processes. These design procedures are even more conservative when applied to composite tubular seam-welded elements. This paper presents an experimental campaign performed to investigate the structural behaviour of steel- and concrete-filled composite columns made with seam-welded rectangular hollow profiles. The experiments involved columns with only steel sections, concrete-filled and concrete-filled plus additional reinforcing bars. The main aim of the tests was to identify the contribution of each component in the overall structural response. The results enable an evaluation of the design recommendations present in Eurocode 4 aiming to determine less conservative buckling curves to be used for the investigated composite columns made of seam-welded rectangular hollow sections.

关键词： Reinforced concrete

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Spatial pattern of sediment transport for analysis of precipitation direction and magnitude in the upper Lematang river sub-basin 4

Spatial pattern of sediment transport for analysis of precip...

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4th Geomatics International Conference 2019, GeoICON 2019

作者： Sarino Yuono, Agus Lestari Putranto Dinar, D.A. Civil Engineering and Planning Study Program Faculty of Engineering University of Sriwijaya Jl. Raya Inderalaya Km. 32 Ogan Ilir Regency Inderalaya South Sumatera Province Indonesia Civil Engineering Post Graduate Study Program Faculty of Engineering University of Sriwijaya Jl. R. Soeprapto Bukit Besar Palembang City South Sumatera Province Indonesia

The high level of erosion that occur in Musi river basin has improved a tremendous impact on sedimentation in downstream areas and has resulted in many infrastructure of water is disturbed, such as silting of irrigation channels, siltation of rivers which disrupt the flow of transport stream and increasing the risk of flooding, high sedimentation in the port basin, low quality of water and the rising costs of water treatment. This study utilizes techniques terrain models Digital (Digital Elevation Model/DEM) to analysis the spatial distribution of the potential for erosion and sources of sedimentation, as well as the direction of the flow of sediment into channels as well as its relationship with outlet in branching river as the supplies to be sediment to the river flow. The method used in this study using a spatial model analysis with the help of GIS in analysing and presenting the level of erosion and deposition by utilizing modelling slope and kinetic energy of rainfall to estimate the index erosivity and distribution pattern of sediment into the river channel. This research was conducted at the upper Lematang river sub basin with area 412,638 Ha, which are classified into 11 sub-chatments with the highest altitude is 3.159 m above sea level (Dempo Valley) and the lowest is 126 m above sea level (Talang tinggi Valley). Analytical results have been tested by taking a fine sediment sampling in each sub-watershed in the analysis and is taken along the channel network and compare the observed patterns with the results predicted by the model analysis of soil erosion. Overall, erosion by high intensity tends to occur in the relationship between the different vegetation coverage, the barren land and open land used for farms and land used for mining. Approximately 45-65.5% slope bad condition because the vegetation has been open, so it can be seen the amount of erosion in the area is 2.139 ton/ha/year, at the sloping is 1.8239 ton/ha/year. © 2019 Published under licence

关键词： Erosion

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Effect of treatment of sisal fiber on morphology, mechanical properties and fiber-cement bond strength

Effect of treatment of sisal fiber on morphology, mechanical...

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作者： Santos, Rogério De Jesus Lima, Paulo Roberto Lopes Post-graduate Program of Civil and Environmental Engineering Department of Technology State University of Feira de Santana Av. Transnordestina S/N-Novo Horizonte Feira de Santana Bahia44036-900 Brazil

The dimensional instability of vegetable fibers due to hygroscopicity results in a gradual loss of adherence in cement based composites which, when in service, are submitted to a natural variation of humidity. Such an effect reduces the contribution of the fiber as a reinforcement and can cause the early rupture of the material. In this work, a treatment of the sisal fibers is performed with the applying of wetting-drying cycles in order to alter their crystalline structure and improve the dimensional stability of the fiber to withstand the variation of humidity: 6, 10, 20, 30 and 34 cycles were applied in order to evaluate the effect on the properties of fiber;a tensile test, the morphological characterization (MEV) and the evaluation of the chemical structure of fiber were carried out. The effect of the treatment on fiber-matrix behavior was evaluated using the pull-out test. Embedded lengths of 16, 20, 30, 40 and 44 mm were defined through a factorial design and used in the test. It is verified that the use of 10 wetting-drying cycles causes less damage to the tensile strength and the elastic modulus of the fiber and contributes to a better adherence with the matrix, with an increase of up to 23 % compared with the untreated fiber. The statistical analysis of the interaction effect between the studied factors, using 2K factorial design with central composite design, indicates that the number of cycles can be decreased when using a longer length of the embedded fiber. © (2015) Trans Tech Publications, Switzerland.

关键词： Tensile strength

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The role of traffic flow and the Floor Space Index (FSI) in predicting environmental noise 14

The role of traffic flow and the Floor Space Index (FSI) in ...

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14th International Conference on Computers in Urban Planning and Urban Management, CUPUM 2015

作者： Giunta, Mariene Benutti Suriano, Marcia Thais De Souza, Léa Cristina Lucas Viviani, Eliane Graduate Program in Urban Engineering Federal University of São Carlos São Carlos Brazil Post-Doctoral Program Federal University of São Carlos São Carlos Brazil Department of Civil Engineering Federal University of São Carlos São Carlos Brazil

ISBN: (纸本)9780692474341

Traffic flow and building parameters are analysed jointly to identify urban noise tendencies. For this purpose, the building parameter applied is the Floor Space Index (FSI). Acoustical and traffic flow data were collected and incorporated into a Geographical Information System (GIS). The fu-ture scenarios for this zone were created. For the FSI parameter, it was ver-ified that the higher the value of the average FSI, the higher the noise lev-els registered in urban canyons.

关键词： Floors

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A strategic way for promoting improved seismic resistant techniques to Indonesian builders

A strategic way for promoting improved seismic resistant tec...

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9th US National and 10th Canadian Conference on Earthquake engineering 2010, Including Papers from the 4th International Tsunami Symposium

作者： Wijanto, Sugeng Andriono, Takim Tjondro, Johannes Adhijoso P.T. Gistama Intisemesta Jakarta Indonesia Civil Engineering Department Trisakti University Jakarta Indonesia P.T. Gistama Intisemesta Surabaya Indonesia Post Graduate Program Petra Christian University Surabaya Indonesia Civil Engineering Department Parahyangan Catholic University Bandung Indonesia

ISBN: (纸本)9781617388446

Indonesia is located in a seismically prone area. During the Aceh 2004, Yogyakarta 2006, Padang 2009 earthquakes, many casualties were caused by the collapse of buildings. Due to lack of awareness, knowledge and skills, many of these buildings, particularly non-engineered houses, were rebuilt using non-seismic resistant techniques as used previously. In cooperation with the World Housing Encyclopedia (WHE), a strategic way for promoting improved seismic resistant construction to Indonesian builders has been implemented. Architectural and civil engineering students are involved. A special tutorial is conducted periodically by seismic engineering experts to enable these students to learn practical seismic resistant techniques for designing and constructing single to two storey dwellings as well as multi storey reinforced concrete buildings. During their studies they are assigned to promote these techniques to the community at large and to builders in particular. A student e-network is set up to enable them to exchange ideas and encourage each other. The first phase of this effort is reported in this paper.

关键词： Students

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Influence of CDW Recycled Aggregate on Drying Shrinkage of Mortar

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Open Journal of civil engineering 2012年第2期2卷 53-57页

作者： Paulo Roberto Lopes Lima Monica Batista Leite Civil and Environmental Engineering Post-Graduate Program State University of Feira de Santana Feira de Santana Bahia Brazil

The use of fine recycled aggregates as raw material in the production of mortars appears as a good alternative to minimize waste disposal, so as to reduce natural resources consumption and to find and supply suitable substitutes for natural aggregates. However, the use of this alternative material in a safe way must be carried out by a wide investigation of its long term behavior. In this way, this paper will examine the mechanical strength, physical properties and drying shrinkage of mortar, which use recycled fine aggregates that have originated from construction and demolition waste (CDW) containing mortar (55%), ceramic (26%) and concrete (16%). Two natural mortars, made with natural sand, were produced with cement/sand ratios of 1:4 and 1:8 (by weight) and a fixed consistency index of 260 +10 mm. Recycled mortar was produced with 50% of substitution rate, in volume, of natural aggregate by recycled one. Results show that recycled mortars present higher total porosity, absorption rate and drying shrinkage than reference mortar.

关键词： Recycled Mortar Construction and Demolition Waste Drying Shrinkage Recycled Aggregate

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An assessment of rolled stainless steel angles under compression 7th

An assessment of rolled stainless steel angles under compres...

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7th International Conference on Structural engineering, Mechanics and Computation, 2019

作者： da Sirqueira, A.S. da Vellasco, P.C.G.S. de Lima, L.R.O. da Silva, A.T. Rodrigues, M.C. Vellasco, M.M.B.R. PGECIV-Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Electrical Engineering Department PUC-Rio – Pontifical Catholic University of Rio de Janeiro Brazil

ISBN: (纸本)9781138386969

Stainless steel has been used in several types of constructions. Although many of their mechanical properties are similar to the properties of carbon steel, their nonlinear characteristics imply in different design rules. This non-linearity mainly affects the response to local and flexural buckling. The Eurocode 3: Part 1-4 (2006) stainless steel design standard can be applied to hot rolled, welded and cold formed products, but the provisions of this code are rather conservative, with a limited application due to the lack of experimental data. Thus, one of those areas that require attention and study concerns the behaviour of columns made of rolled stainless steel angles. This paper describes an experimental campaign made on rolled stainless steel angles under axial compression. The tests were performed on stainless steel rolled angles with lengths varying from 150 mm to 1400 mm while the collapse involved: flexural-torsional and flexural buckling modes. © 2019 Taylor & Francis Group, London, UK.

关键词： Hot rolling

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Facades inspection with infrared thermography: cracks evaluation

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Journal of Building Pathology and Rehabilitation 2016年第1期1卷 1-7页

作者： Elton Bauer Elier Pavón Elias Oliveira Claudio H. F. Pereira Post-Graduate Program in Structures and Civil Construction Civil and Environmental Engineering Department University of Brasília Brasília Brazil Centro das Ciências Exatas e das Tecnologias Post-Graduate Program in Structures and Civil Construction - UnB Universidade Federal do Oeste da Bahia-UnB Barreiras Brazil

Infrared thermography is an evaluation technique that helps to identify anomalies and can provide information on their incidence and severity. The aim of this study is to apply quantitative thermography to study a case of severe cracks in facade analyzing the evolution of temperatures and Delta-T. The temperature evolution was studied over a day. There was sun incidence occurring during part of the day, allowing to calculate and assess the evolution of the associated temperatures. Thermograms were acquired hourly during the study period. The highest temperatures were observed at 12:00 noon, and the larger Delta-T between 10:00 and 12:00. There were differences between the Delta-T profiles among the three regions studied. The best time for analysis is when Delta-T is higher. Cracks with higher Delta-T were considered more degraded, and generalized branched cracks did not allow a comparative conclusion.

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