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

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Diagonal Shear Tests for Glass Fiber Reinforced Gypsum (GFRG) Panels with and Without Concrete Filled Cells 10th

Diagonal Shear Tests for Glass Fiber Reinforced Gypsum (GFRG...

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

作者： Guzelbulut, Beyza Kapucu Binbir, Ergun Celik, Oguz C. ITU Grad Sch Istanbul Turkey ITU Struct & Earthquake Engn Div Fac Architecture Istanbul Turkey

ISBN: (纸本)9783030881665;9783030881658

This study presents results from a number of glass fiber reinforced gypsum (GFRG) wall specimens that were monotonically tested at an angle of 45 degrees and under increasing vertical load. Several infill configurations are considered to see possible changes in strength, stiffness, and failure modes. Eight samples with 770 mm x 770 mm x 124 mm side dimensions were prepared to be used in the diagonal shear tests. Concrete and steel reinforcement (rebar) elements were added to the system to achieve the required strength, stiffness, and ductility. C25 concrete grade and empty set12 steel deformed rebars with a steel grade of S420 were used in these samples. The samples were forced to collapse under a monotonically increasing load. Overall behavior was observed and behavioral values such as ultimate shear strength and initial wall shear rigidity/stiffness values were determined. Related load-deflection curves are given. According to the data that were gathered from the experiments, unfilled specimens and specimens filled with concrete at the middle or edge cells had load capacities around (70-85) kN, while fully concrete filled specimens achieved capacities up to (260-270) kN. Experimental results show that filling the edge or middle cells with concrete (i.e. sort of partial filling) has no significant effect on shear capacity when compared to unfilled samples. Crack patterns developed especially within the unfilled cell regions. The fully concrete filled panel, on the other hand, had a significant impact (approximately 3-4 times) on the capacity when compared with the unfilled case. The rebars used in the fully filled samples had no significant effect mainly from the occurrence of separation between the concrete core and GFRG panel for this type of loading but it increased initial stiffness. When the whole system is compared, concrete filling and rebar increase the initial stiffness of the sample. Filling the edge or middle cells with concrete (with and without rebar)

关键词： GFRG Diagonal shear test Shear strength Shear rigidity/stiffness Initial stiffness

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Earth Pressure, a Load, or a Resistance: Formulation of the 'What You Design is What You Get' Model for Stability Design of Propped Cantilever Walls 4th

Earth Pressure, a Load, or a Resistance: Formulation of the ...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Yuen, C. K. S. Transport New South Wales South Wales Australia

ISBN: (纸本)9783030772383;9783030772376

The geotechnical stability design for cantilever retaining walls is often determined by a factor of safety expressed as a ratio between resistance and disturbing load. Many variations of this ratio exist, but most consider the disturbing load extending to the toe level of the wall. Questions are asked: Is the earth pressure a load or a resistance, particularly for the part of wall that penetrates beyond the critical depth at which the wall is at critical rotational equilibrium, and if it is not a load then what is it? The quest to the answers has led the author to formulate the 'What You Design Is What You Get', the WYDIWYG model, for stability design of propped cantilever walls. The new design method is shown to be consistent, numerically stable for all soil conditions. The formulation is suitable for Load Resistance Factor Design (LRED) method, and it allows the Factor of Safety (FoS) to be expressed in terms of the wall critical restoring capacity. For example, the wall designed with a FoS of 2 using this method will have two times the restoring capacity at critical equilibrium, and what you designed is what you get. The calculated FoS can be meaningful and easily comprehensible. The new method could provide a platform for designers to compare between cases and assess adequacy of the level of stability with improved certainty. A worked example is included to demonstrate simplicity of the calculation process.

关键词： Embedded cantilever retaining walls Stability design Supported excavation

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Mechanical Characterization of 17-4PH Stainless Steel Manufactured by Means of Selective Laser Melting Technology 10th

Mechanical Characterization of 17-4PH Stainless Steel Manufa...

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

作者： Andreacola, Francesca Romana Capasso, Ilaria Brando, Giuseppe Univ G dAnnunzio Dept Engn & Geol Viale Pindaro 42 I-65127 Pescara Italy

ISBN: (纸本)9783031038136;9783031038112;9783031038105

3d printing is a manufacturing process based on the addition of material layer by layer until the completion of workpieces. The rapid development of additive manufacturing, in recent years, is due to its many advantages, including material consumption and waste minimization, use of pure raw materials, low post-processing requirements, time and cost reduction, high customization of the finished product, fast prototyping, and freedom of design. So, exploiting the huge potential of these innovative technologies, it is possible to propose their application also in some fields of engineering for which they have never been considered, such as seismic and structural engineering. In fact, the most common metallic materials typically employed for those applications (steel, aluminium, titanium and nickel alloys), can be used to produce elements with outstanding structural properties by 3D printing technologies. In this aim, this paper shows the main outcomes of an experimental campaign finalized to an extensive mechanical characterisation of 17-4PH stainless steel, one of the most widely used metallic materials for Selective Laser Melting (SLM) technology. In particular, the effects of one of the main printing parameters, i.e. scanning times, on the material mechanical behaviour are evaluated by means of tensile strength tests.

关键词： Selective laser melting 3D-printing Stainless steel

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An Experimental Study on Concavely Curved Soffit Reinforced Concrete Beams Externally Bonded with FRP 10th

An Experimental Study on Concavely Curved Soffit Reinforced ...

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

作者： Al-Mahaidi, Riadh Al-Ghrery, Khattab Kalfat, Robin Oukaili, Nazar Swinburne Univ Technol Fac Sci Engn & Technol Dept Civil & Construct Hawthorn Vic 3122 Australia Univ Baghdad Dept Civil Engn Coll Engn Baghdad 10070 Iraq

ISBN: (纸本)9783030881665;9783030881658

Externally-bonded (EB) fibre reinforced polymer (FRP) retrofitting system has emerged as a promising strengthening technique to improve flexural performance of concrete structures. This paper presents the results of an experimental program studying the behaviour of concavely-curved soffit reinforced concrete (RC) strengthened in flexure with EB carbon fibre reinforced polymer (CFRP) composites. Thirty-two RC beams were statically tested in this program. Of these beams, twenty-three were curved soffit beams with varying degree of curvature ranging between 5 mm/m and 20 mm/m, and nine beams were constructed with flat soffit as control beams. The ultimate capacity, failure mode, flexural stiffness, and the ductility of these beams are analysed and discussed. Based on the experimental results, concavely-curved soffit RC beams with the smallest degree of curvature strengthened with EB-CFRP performed better than beams with higher degree of curvature strengthened with similar CFRP system. This study identifies gaps of knowledge in existing design guidelines and codes and presents recommendations for designers on EB-CFRP technology.

关键词： Flexure strengthening Externally bonded EB-FRP Carbon fibre reinforced polymer CFRP Reinforced concrete Curved soffit beams Premature de-bonding

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Influence of Fabrics on Compression Mechanics of Iron Tailings 6th

Influence of Fabrics on Compression Mechanics of Iron Tailin...

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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

Due to irreparable damages done by the failure of tailing dams to the human, assets and environment which have ultimately resulted in great economic, social and environmental challenges worldwide, investigations into mechanical behaviour of tailings have received some attentions. However, the knowledge and understanding of mechanics of compression behaviour in iron tailings is still limited. This study investigates the mechanical behaviour of tailings in compression considering effects of fabric resulting from sample preparation and the possibility of nonconvergent behaviour. This was achieved by conducing series of one-dimensional compression tests in conjunction with index, microstructural, chemical and mineralogical tests. The results show that the effects of fabric resulting from sample preparation is seen. There is presence of parallel and non-unique normal compression lines which is an important feature of transitional mode of behaviour. The behaviour of iron tailings therefore depends on initial specific volume.

关键词： Tailings Compression Fabrics Geotechnical properties Transitional behaviour

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Effective Ways to Handle the Change Management for Cost in Various Types of Contracts

Effective Ways to Handle the Change Management for Cost in V...

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

作者： Nandini, S. Sree Varadharajan, R. Kumar, S. Kishore Krishnaraj, L. SRM Inst Sci & Technol Coll Engn & Technol Dept Civil Engn Chennai 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

The usage of change management in project management field that has become crucial change within the construction can be consolidated directly or as project claims. Lots of theories and areas of concerns were spotted and claims consolidated methods and techniques to hunt best practices to resolve such problems between all construction project stakeholders. This study collects data from seven different projects in various locations, and the data sheet was distributed to Contracts professionals. The research gap is addressed by analyzing and plotting the factors affecting the contracts and also the effects of cost, change performance. The validation was carried manually. From the obtained results, there are some factors which show negative impact for contractors to complete the project without delay. The cost variations doesn't show much impact and lump sum contract can be an effective contract to achieve a project budget and on-time delivery. The achieved results can apply for upcoming project to reduce the delay and cost variation in project.

关键词： Contracting methods Business process management Construction claims Change management in contract Supply management Cost impact

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Calculation of Fuel Baseline and CO2 Emission for Heavy Duty Vehicles in Viet Nam 6th

Calculation of Fuel Baseline and CO2 Emission for Heavy Duty...

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

作者： Vu, Khiem Ngoc Tran, Tuan Trong Nguyen, Doan Cong Pham, Binh Thai Univ Transport Technol Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

Nowadays, the demand for transporting passengers and goods is increasing so the number of trucks and passenger vehicles inVietnam as well as other countries in the world is continuously increasing to meet such demand. The increase in the number of trucks and passenger vehicles has caused consequences related to environmental pollution, particularly (PM) and CO2 emissions. GFEI's partners agreed with the objective of reducing 35% (referred to as the "35/35 program") of heavy-duty vehicles (HDV) average fuel consumption across the world by 2035. The basis of such reduction is presented by the International Council on Clean Transportation (ICCT) based on a report published in 2016 which assessed the potential for improving fuel savings of HDVs in major markets. The reduction of HDV fuel consumption by 35% in the period of 2015-2035 can be considered as an ambitious target but it is achievable. The paper presents the results of the analysis of the current state of new HDV in Vietnam based on the Global Fuel Economy Initiative (GFEI) Index for the period 2010-2019. Results show that if cutting down fuel is currently maintained, by 2035, the CO2 emissions level of heavy-duty trucks and passenger vehicles will be reduced about 32% compared to that of 2015. The calculation results of GFEI and CO2 emissions can be used as a reference for the development of emission index for motorized vehicles and scientific basis for manufactures, assemblers and regulators to reduce fuel consumption and CO2 emissions.

关键词： GFEI CO2 emission Electric vehicles Vietnam

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Comparison of Corrosion Hazard Map in 10 Years Duration Using Air Pollution and Climate Data 5th

Comparison of Corrosion Hazard Map in 10 Years Duration Usin...

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

作者： Izhar, Aina Shazwana Mohd Khalid, Nor Hazwani Nor Usman, Fathoni Adriyanshah, Nur Fadilah Univ Tenaga Nas Coll Grad Studies Kajang 43000 Selangor Malaysia Univ Tenaga Nas Dept Civil Engn Kajang 43000 Selangor Malaysia Univ Tenaga Nas Inst Energy Infrastructure Kajang 43000 Selangor Malaysia

ISBN: (纸本)9789811686672;9789811686665

Atmospheric corrosion is a severe challenge for most common metals due to its effect on the service life and strength of structural materials, especially steel structures. In a tropical climate country such as Malaysia, high humidity, temperature, and rainfall precipitation contribute to the high time of wetness in the atmosphere. The wetness condition and air pollution will accelerate corrosion formation. Rapid economic growth and development of industrial areas have significantly increased the number of corrosion agents immerse in the atmosphere. Since corrosion is influenced by the atmosphere, the changes in corrosion level would be identified by comparing the corrosion hazard map for 10 years duration. The climate and air pollution data were analyzed using the inverse distance weighting (IDW) method to form a Corrosion Hazard Map of Peninsular Malaysia. Observation on the maps discovered that throughout the 10 years, southern and west coast areas have the highest corrosion level, while the lowest corrosion level occurred around the center part of Peninsular Malaysia. Information on the corrosion level will benefit highly dynamic industries in planning and decision-making, indirectly reducing losses.

关键词： Corrosion Corrosion hazard map Atmospheric corrosion Metal corrosion Geographical information system

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Use of Distributed Optical Fibre to Monitor the Crack Propagation of an Adhesively Bonded Joint During an ENF Test 10th

Use of Distributed Optical Fibre to Monitor the Crack Propag...

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

作者： Sourisseau, Quentin Lepretre, Emilie Chaitaigner, Sylvain Chapeleau, Xavier Mouton, Luc Paboeuf, Stephane Univ Gustave Eiffel MAST SMC Bouguenais France Univ Gustave Eiffel INRIA I4S Team COSYS SII Bouguenais France Bur Veritas Marine & Offshore Expertise Dept Nantes France

ISBN: (纸本)9783030881665;9783030881658

The floating production, storage and offloading units (FPSO) being generally in a tropical area, makes corrosion a fundamental ageing problem of these steel structures. Therefore, there is a strong need for proposing repair solutions having low impact on their exploitation. The owner of these units are highly interested in the development of "cold repair" in contrast with "hot works" which require to stop the production for security risks, like adhesively bonded FRP (Fibre Reinforced Polymer) patch which requires additional development, in particular in the design step. The design of these reinforcements needs a complete understanding of the mechanical state of the patch which is based on the different materials and interfaces properties. Fracture mechanics seems an interesting option to express the mechanical state of the patch and more particularly the risk to undergo interlaminar fracture or steel interface debonding failure before materials failure. The experimental definition of the required design values for such an approach (critical toughnesses) are generally obtained with common tests such as DCB (Double cantilever beam) or ENF (End notch flexure) tests. The presented study is focused on the determination of the critical toughness in mode II through ENF (End Notched Flexure) test which can be done following some standards, such as ASTM D7905. A distributed optical fibre was used to verify the correct determination of the initial crack length, to determine the crack propagation during the test, and to monitor the fracture process zone length. The currently used methods, such as visual observation or Digital Image Correlation (DIC) of the crack front at the border of the sample, may indeed induce error if the crack is not straight. To compare these methods, the realized test was monitored using a distributed optical fibre placed in the centre of the lap width, in and on the specimen. Firstly, the issues related to the integration of this continuous optical fi

关键词： Adhesive bonding Fracture mechanics Optical fibre ENF Experimental investigations

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Hygrothermal Ageing of Pultruded GFRP Profiles: Experimental Study and Prediction Models 10th

Hygrothermal Ageing of Pultruded GFRP Profiles: Experimental...

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

作者： Sousa, Joao Garrido, Mario Correia, Joao Ramoa Cabral-Fonseca, Susana Shahid, Md Toyob Univ Lisbon Inst Super Tecn CERIS Av Rovisco Pais 1 P-1049001 Lisbon Portugal Natl Lab Civil Engn LNEC Av Brasil 101 P-1700066 Lisbon Portugal

ISBN: (纸本)9783030881665;9783030881658

Research concerning the long-term behaviour of fibre reinforced polymer (FRP) composites in civil engineering applications is increasing, as key actors in this industry recognize the existence of many knowledge "gaps" that still need to be fulfilled. Several competing mechanisms may affect the durability of FRPs during exposure to hygrothermal ageing conditions, and in the specific case of pultruded glass-fibre reinforced polymer (GFRP) profiles, comprehensive and validated data on their durability is still limited. The typically long service lives required for most structures together with the low frequency of routine inspection and maintenance operations in civil infrastructure enhance the importance of having reliable durability data and suitable prediction models for the long-term performance of these materials. This study presents results of an experimental and analytical study designed to investigate the effects of hygrothermal ageing on the durability and long-term performance of two commercial GFRP profiles made of two alternative resin systems - unsaturated polyester (UP) and vinylester (VE), both comprising the same fibre content and architecture. Test specimens of the two types of profiles were subjected to different ageing environments, namely immersion in demineralised and salt water at three different temperatures (20 degrees C, 40 degrees C, and 60 degrees C) and continuous condensation at 40 degrees C for up to two years, and were tested after a desorption period, thus including the potential property recovery after drying to constant mass due to the reversible nature of some of the physical degradation mechanisms. The performance of both profiles was analysed and compared regarding their mechanical response in tension and flexure after being subjected to hygrothermal ageing. The experimental data thus gathered were subsequently used to derive analytical models for the prediction of long-term effects and service life of pultruded GFRP profiles based

关键词： Hygrothermal ageing Pultruded profiles Durability Arrhenius prediction models

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