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

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

作者： Hung Pham Sass, Ingo Oanh Nguyen Tech Univ Darmstadt Inst Appl Geosci Geothermal Sci & Technol Darmstadt Germany GEOS Construct Technol Consulting JSC Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Land subsidence due to groundwater extraction is a serious issue in Mekong Delta Vietnam, especially when it combines with the sea level rise. Various models were established to study the problem. Usually, two steps models are used. First, the groundwater models are solved to obtain changes in the water table resulting in changes in effective stress. Then, land subsidence magnitude is calculated based on the one-dimensional consolidation theory. After analyzing carefully land subsidence models for the Mekong Delta, we would like to discuss here some concerns related to the described data and methodologies, which are related to (1) the inconsistency between the compression index and the specific storage, (2) the spatial distribution of parameters, (3) obtained parameters using the parameter estimation tool, (4) comparisons between INSAR data and model results.

关键词： Models of land subsidence Mekong Delta

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Spectral Stochastic Isogeometric Analysis of Microbeams with Material Uncertainty 6th

Spectral Stochastic Isogeometric Analysis of Microbeams with...

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

作者： Toan Minh Le Duy Vo Tinh Quoc Bui Thu Van Huynh Limkatanyu, Suchart Rungamornrat, Jaroon Chulalongkorn Univ Fac Engn Dept Civil Engn Appl Mech & Struct Res Unit Bangkok 10330 Thailand Tokyo Inst Technol Dept Civil & Environm Engn Tokyo 1528552 Japan Prince Songkla Univ Fac Engn Dept Civil Engn Hat Yai 90112 Thailand

ISBN: (纸本)9789811671609;9789811671593

In this study, the nondeterministic linear static response of planar microbeams accounting for the influence of material microstructures and material uncertainty is investigated by the method of spectral stochastic isogeometric analysis (SSIGA). The beam formulation is developed based upon Timoshenko hypothesis and modified couple stress theory. The uncertainty of Young's modulus is modelled as a homogeneous Gaussian random field over a one-dimensional space occupied by the beam axis. Within the framework of SSIGA, the random field, represented by Karhunen-Loeve expansion, is discretized by the univariate non-uniform B-spline basis functions. The arbitrary polynomial chaos expansion is subsequently adopted to predict the statistical characteristics (e.g., mean and standard deviation) of the stochastic deflection. Finally, a numerical study on a representative cantilever microbeam is presented to demonstrate the significance of integrating the material uncertainty in the analysis of micro-scaled beams.

关键词： Modified couple stress theory Microstructure effects Material uncertainty Spectral Stochastic Isogeometric analysis Timoshenko beam

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Investigations into Grading Characteristics of Tailings 6th

Investigations into Grading Characteristics of Tailings

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

作者： Okewale, Ismail Adeniyi Grobler, Hendrik Univ Johannesburg Dept Min Engn Johannesburg South Africa

ISBN: (纸本)9789811671609;9789811671593

Tailings are by-products of beneficiation processes of run-off mine in order to extract valuable fractions from ore minerals. Studying this material is essential due to importance of its handling and consequent negative impacts on human and environment as well as limited understanding of its mechanics. Grading is one of important aspects of mechanics of behaviour of geomaterials and it is investigated in details in this study. This is achieved by conducting index tests on samples collected at different depths in the pond. Also, comparisons were made with other tailings reported in the literature. The engineering descriptors (mean particle size, coefficient of uniformity, coefficient of curvature, clay fraction and fines content) were considered as grading characteristics. Different grading characteristics were found for the tailings. The grading curves may result from degree of sorting by sedimentation at different points.

关键词： Grading Tailings Mechanics engineering descriptors Index properties

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Experimental Study on Behaviour of Clayey Sand Reinforced by Polypropylene Fibre 6th

Experimental Study on Behaviour of Clayey Sand Reinforced by...

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

作者： Sy Hung Nguyen Ho Chi Minh City Univ Technol & Educ Ho Chi Minh City Vietnam

ISBN: (纸本)9789811671609;9789811671593

In this paper, the author presents the improvements in the mechanical properties of clayey sand soils reinforced by polypropylene (PP) fibres. PP fibres with 3 different lengths of 10, 15 and 20 mm were mixed with the soil with content by weight of 0.5, 1 and 1.5%. Three types of experiments were conducted including 30 compaction tests, 30 direct shear tests and 10 triaxial compression tests. With the same compaction energy, the maximum dry density was achieved with a fibre length of 20 mm and a fibre content of 1%. After determining the optimum water content for each type of fibre length and content, the soil samples in the direct shear and triaxial compression test were prepared by compaction to have the corresponding maximum density. The direct shear test showed that as the fibre content or the fibre length increased, the cohesion c increased whilst the friction angle phi decreased. The cohesion c reached the maximum value with the fibre length of 20 mm and the fibre content of 1%. This value was 9 times greater than that of c of the un-reinforced soil. In the consolidated undrained (CU) triaxial test, the peak deviator stress was significantly improved compared to un-reinforced soil. The maximum values of both cohesion cCU and friction angle phi CU were achieved with a fibre length of 15mm and a fibre content of 1%. The largest value of cCU of the reinforced soil was more than 10 times of the unreinforced soil. However, phi CU did not have much improvement compared to un-reinforced soil.

关键词： Fibre-reinforced Triaxial test Compaction test Polypropylene fibre

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A Comparative Study on Generation and Composition of Food Waste in Desa Pandan Kuala Lumpur During Covid-19 Outbreak 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Zakarya, Irnis Azura Rashidy, Nur Adilah Izhar, Tengku Nuraiti Tengku Ngaa, Muhammad Haizar Laslo, Lucian Univ Malaysia Perlis Fac Civil Engn Technol Arau 02600 Perlis Malaysia Univ Malaysia Perlis Ctr Excellence Geopolymer & Green Technol Sustainable Environm Res Grp SERG Kangar 01000 Perlis Malaysia Tekno RE Consulting Sdn Bhd Equine Commercial Ctr S-07-11 Trio PermaiJalan Equine Bandar Putra Perm Seri Kembangan 43300 Selangor Malaysia Natl Inst Res & Dev Environm Protect Bucharest IN Splaiul Independentei St6th Dist Bucharest 294060031 Romania

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Food waste is a type of solid waste that is heavily influenced by consumers. The composition (%) and the total weight generation (kg) of food waste were determined during the Covid-19 outbreak. The data was obtained by direct weighing of the food waste collected where it was generated throughout the day. Findings have shown that 63.3% of the composition of uncooked food waste types identified is generated by internal organs, vegetables, fruits, and eggshells, while 36.7% of the identified composition of cooked food waste types is generated by rice and noodles, bones, vegetables, fruits, and others in Desa Pandan. During six days of collection, the total food waste generated by 30 households, 10 restaurants, and 3 schools was 146.5 kg (0.20 kg/capita/day), 231.7 kg (0.026 kg/capita/day), and 155.4 kg (0.010 kg/capita/day) respectively. A food waste awareness survey was conducted online with 100 respondents using Google Forms. Findings show that the Covid-19 pandemic did influence people's attitudes and practices regarding food purchase, management, and consumption habits, all of which have a substantial impact on reducing food waste generation at the household level.

关键词： Food waste Composition Generation Awareness Management Covid-19

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Comparison Between Direct Shear and Flexural Tests on RC Elements Strengthened with SRG Composites Subjected to Cyclic Loading 10th

Comparison Between Direct Shear and Flexural Tests on RC Ele...

引用

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

作者： Incerti, Andrea Bellini, Alessandro Mazzotti, Claudio Univ Bologna CIRI Bldg & Construct CIRI EC Via Lazzaretto 15-5 I-40131 Bologna Italy Univ Bologna Dept Civil Chem Environm & Mat Engn DICAM Via le Risorgimento 2 I-40136 Bologna Italy

ISBN: (纸本)9783030881665;9783030881658

Steel reinforced grout (SRG) retrofitting systems represent a suitable technique to increase the performances of reinforced concrete (RC) structures, in particular for structural elements subjected to flexure. They can be applied even to wet surfaces and they feature a better fire resistance with respect to Fiber-Reinforced Polymer (FRP) composites. Nevertheless, the failure mode of strengthened elements can be similar to that of FRPs, i.e. debonding of the externally bonded reinforcement, especially if several layers of composite reinforcement are applied to the RC element. Different studies can be found addressing the problem of bond between SRG and RC or masonry substrates, but only few of them analyzed the bond performance when multiple layers are considered. To this purpose, the present paper presents the results of an experimental campaign focused on this specific key-aspect of the bond behavior, i.e. when multiple SRG layers are considered. Single-lap shear tests were carried out on concrete prisms strengthened by a single or multiple SRG layers, addressing the differences in terms of bond behavior and failure modes. In addition, monotonic and cyclic loading were considered in order to verify the possible bond degradation when applying high amplitude cycles;results of the cyclic loading tests were compared with those from monotonic tests on single or multiple SRG layers with the same amount of reinforcement. Flexural tests were carried out on full-scale RC beams strengthened with multiple plies of SRG reinforcement, without mechanical anchorages. Beams were subjected to either monotonic or cyclic loading. Tests were carried out under displacement control in order to properly characterize the non-linear behavior, evaluating the effect of composite reinforcement in terms of failure mode and ductility. The comparison between both small (single-lap) and full-scale (beams) tests allows to investigate the applicability of the bond relationship developed at small sc

关键词： SRG RC beam Flexural test Bond test Cyclic

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Study and Propose a Formula to Determine the Temperature Gradient Used to Calculate the Thermal Curling Tensile Stress for the Cement Concrete Pavement Slab in Vietnam Conditions 6th

Study and Propose a Formula to Determine the Temperature Gra...

引用

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

作者： Nguyen Duy Dong Nguyen Quoc Van Nguyen Vu Viet Trinh Trung Tien Le Quy Don Tech Univ Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

When calculating and determining the thermal curling tensile stress of cement concrete pavement, it is necessary to determine the temperature difference between the top and bottom (Delta T) of the pavement. In another word, it is necessary to determine the maximum temperature gradient (<(Delta T)over bar>(max)) and temperature gradient (<(Delta T)over bar >) for that designed pavement. Currently, in order to determine <(Delta T)over ba >, depending on the specific conditions of each country, each climatic region, there must be appropriate regulations and calculation procedures. The particular determination depends on the air temperature and solar radiation and its pavement thickness. Therefore, in this paper, the authors would like to propose a formula to help the design engineer quickly and reasonably determine the temperature gradient (<(Delta T)over bar>) value of the concrete sheet of M40 compression strength depending on the pavement geography location and the pavement thickness.

关键词： Concrete rigid pavement Temperature gradient Rigid pavement Thermal stress Thermal curling tensile stress

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Numerical Study on Seismic Repair by Re-tightening Turnbuckle Braces 10th

Numerical Study on Seismic Repair by Re-tightening Turnbuckl...

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

作者： Nakada, Shotaro Kishiki, Shoichi Tokyo Inst Technol Tokyo Japan

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Gymnasium is one of the most important facilities used as an evacuation centre during a disaster in Japan. So securing the earthquake resistant of such structure is important. For gymnasiums, tension-only brace is an important for seismic member. It is thought that the gymnasium can be used early after disaster by repairing the braces. This paper focuses on the seismic repair by re-tightening turnbuckle braces. The dynamic response analysis using single-degree-of-freedom system was conducted to investigate the safety against aftershocks and the effectiveness of repair. The findings obtained from the dynamic analysis are summarized as follows: (1) the maximum story drift ratio does not increase when the aftershock's PGV is less than 20% of the mainshocks or less than 20 cm/s;(2) it is not needed to consider the increase of the maximum story drift ratio because almost all the aftershock's PGVs are less than 20% of the mainshocks;(3) the number of turnbuckle braces that exert the effectiveness of repair can be obtained by using the equations proposed in this study.

关键词： Seismic repair Aftershocks Turnbuckle-braces Gymnasiums Single-degree-of-freedom

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An Overview: Modern Countermeasures Against Local Scour at Bridge Piers-Applicability in Vietnam 6th

An Overview: Modern Countermeasures Against Local Scour at B...

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

作者： Mai Quang Huy Univ Transport & Commun UTC Lang Thuong Ward 3 Cau Giay St Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Local scour is a complex phenomenon consisting of three-dimensional flow structures that often develop around piers and abutments founded in movable river beds. Major damage occurs to bridges during flood, mainly because of scour at bridge foundation, particularly the piers and abutments. In Vietnam, every year there are many serious damages to bridges caused involving local scour. In this article some modern countermeasures against local scour at bridge piers from National Cooperative Highway Research Program (NCHRP) Project were considered, including riprap, articulating concrete blocks, gabion mattresses, rigid and flexible grout filled mattresses. The applicability of each method to bridge structures in Vietnamese conditions was also presented in detail. The results of analyzing the advantages and disadvantages of the four methods of erosion control above show that the riprap method is quite suitable in the conditions of Vietnam.

关键词： Local scour Bridge pier Countermeasure Vietnam condition

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Concept and Preliminary Test of the Intelligent FRP Bridge Deck for the Vehicular Bridges 10th

Concept and Preliminary Test of the Intelligent FRP Bridge D...

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

作者： Kulpa, Maciej Rajchel, Mateusz Siwowski, Tomasz Rzeszow Univ Technol Rd & Bridge Dept Rzeszow Poland

ISBN: (纸本)9783030881665;9783030881658

The paper describes the concept of the smart FRP composite bridge panel with integrated distributed fibre optic sensors (DFOS), intended to monitor its behavior under live load. The system consists of continuous sensors, thanks to which it is possible to measure every part of the panel and the obtained response of the structure is comprehensive. The sensors are placed inside the laminates, thanks to which they are inseparably and securely connected with the structure. This solution required production tests to develop a durable and mass-produced solution. The final effect is an intelligent panel that can diagnose its condition based on algorithms and indicate the occurrence of anomalies. The idea of placing fiber optic sensors in the material required first and foremost material tests, which, apart from obtaining data on the material itself, allowed to verify the readings from the DFOS system in relation to typical, discrete measurement systems. Subsequently, production tests were carried out on full-height sandwich panels by placing sensors in both the outer and inner laminate. After the preliminary tests were carried out, detailed calculations of the panels under the design load as components of the bridges were made. In the last stage, various types of connections were designed, allowing the FRP panel to be joined with conventional girders: steel and concrete, as well as connections between individual segments of FRP panels.

关键词： Deck Bridge Sandwich Optic sensor DFOS

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