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

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Thin Sandwich Elements Prestressed with CFRP Tendons 10th

Thin Sandwich Elements Prestressed with CFRP Tendons

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

作者： Von der Christine, Ann-Heid Bosbach, Sven Stark, Alexander Schulze-Ardey, Jan Philip Hegger, Josef Rhein Westfal TH Aachen Inst Struct Concrete D-52074 Aachen Germany H P Ingenieure GmbH D-52072 Aachen Germany

ISBN: (纸本)9783030881665;9783030881658

Sandwich panels exhibit an attractive choice for modern building envelopes. Innovative high performance materials such as non-corrosive carbon reinforcement make it possible to produce elements with thin layers, which fulfil the requirements of sustainable and durable building envelopes. The application of two thin facings made of high performance concrete (HPC) and a core of polymeric rigid foam (PU) can highly enhance the load-bearing capacity of sandwich panels providing a low weight at the same time. In order to enable large facade elements or wide-span roof elements, an additional prestressing with CFRP (carbon fibre reinforced polymer) tendons is advantageous. These prestressed slender sandwich elements have a high potential for economic savings in terms of material and transport as well as reduced time efforts during mounting. The paper reports on experimental investigations during the development of planar elements made of carbon reinforced HPC and pretensioned CFRP tendons. The determination of the transfer length of CFRP tendons in HPC is described and the results of bond tests on small-scale sandwich elements under tensile and shear loads are shown. Furthermore, the influence of textile connecting devices on the load-bearing capacity was determined. With the conducted experimental investigations, the high potential and performance of sandwich elements prestressed with CFRP and a PU core can be shown.

关键词： Textile reinforced concrete CFRP tendons Prestressed concrete Sandwich constructions Textile connecting devices

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Repeated Load Saturated Soil Behavior Linked to Two Derailment Case Studies 4th

Repeated Load Saturated Soil Behavior Linked to Two Derailme...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Sussmann, Theodore US DOT Volpe Ctr Cambridge MA 02142 USA Univ Hartford Hartford CT 06117 USA

ISBN: (纸本)9783030772383;9783030772376

According to Hay (Railroad engineering, Wiley, New York, 1982), the support of railway track is a critical requirement to achieve the potential of railway track to serve as one of the most cost-effective types of infrastructure in terms of long-term maintenance cost. Uniform resilient support provided to the track structure (rails and ties) is needed to maintain stresses in the track structure that result from the applied train loading within an acceptable range. Excessive track deflection due to poor track support contributes excessive stress to track components. The shallower the support deterioration, the more severe the effect on the track structure and the deeper the support deterioration the more difficult it can be to locate and repair. Saturated-undrained soil conditions would not be expected to compromise track support in railway track built using commonly specified materials. However, changes in track drainage patterns and contamination of open-graded aggregate ballast has been known to result in roadbed saturation and associated softening that is listed in the FRA Railway Accident/Incident Reporting System as derailment cause code T001 Roadbed Settled/Soft. The technical cause of deterioration is often a moisture content increase associated reduction in strength. Repeated load behavior of saturated undrained soils is known to cause specific types of problematic failures that might be mitigated with operational limitations or maintenance. The potential for saturated-undrained repeated load soil failure modes in track can only be assessed if situations susceptible to these conditions can be identified. In this paper, the classic conditions related to these soil failures are discussed as a basis for review of two case studies illustrating the field conditions associated with two distinct failure scenarios.

关键词： Case study Derailment Pore water pressure Cyclic mobility

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Sustainable Management of Vietnamese Coastal Urban System 6th

Sustainable Management of Vietnamese Coastal Urban System

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

作者： Tran Van Tan Ta Thi Thu Huong Natl Univ Civil Engn Hanoi Vietnam Urban Dev Agcy Minist Construct Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

With the rapid growth of the coastal population, predicted to account for 60% of the country's population, Vietnamese coastal cities and towns should not continue developing separately. By systematic thinking and good organization, the coastal cities and towns should link together to establish the costal urban system. This development model will support the economy of scale, level up the efficiency of using coastal infrastructure, and protect national sovereignty. Globally, the megalopolis is an efficient model for managing the coastal urban system. This research will provide international evidences, analyze statistical data of the coastal urban system in the Vietnamese context, and suggest a potential roadmap for applying this coastal urban management model to our management system.

关键词： Coastal urban Megalopolis Urban system management

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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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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...

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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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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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Strength of Rc Beams with an Frp-Strengthened Web Opening 10th

Strength of Rc Beams with an Frp-Strengthened Web Opening

引用

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

作者： Nie, Xue-Fei Zhang, Shi-Shun Teng, Jin-Guang Huazhong Univ Sci & Technol Sch Civil Engn & Mech Wuhan 430074 Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hong Kong Peoples R China

ISBN: (纸本)9783030881665;9783030881658

Web openings often need to be created in existing reinforced concrete (RC) beams for the passage of utility ducts and/or pipes. Such web openings lead to significant decreases in the load-carrying capacities of the beams due to the reduced cross-sectional area and/or severing of some of the existing stirrups. Therefore, an externally bonded fiber-reinforced polymer (FRP) strengthening system is often applied around the web opening to ensure the safety of the weakened beam. A number of existing experimental and numerical studies have provided useful information on the structural behavior of RC beams with an FRP-strengthened web opening. However, it is desirable to develop a simple strength model for RC beams with an FRP-strengthened web opening, if only the strength of such beams is of concern. This paper proposes a strength model for RC beams with an FRP-strengthened web opening for engineering use. Test results are compared with the predicted results using the proposed strength model to verify the accuracy of the model. A good agreement between the predicted and test results is obtained and therefore the proposed strength model is recommended for engineering use.

关键词： Reinforced concrete (RC) beam Web opening Fiber-reinforced polymer (FRP) strengthening FRP confinement Strength model

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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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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...

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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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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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