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

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Design Optimization of Fibres Reinforced Concrete Railway Tracks by Using Non-linear Finite Elements Analysis 6th

Design Optimization of Fibres Reinforced Concrete Railway Tr...

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

作者： Tailhan, J. L. Rossi, P. Univ Gustave Eiffel IFSTTAR MAST EMGCU F-77447 Champs Sur Marne France

ISBN: (纸本)9789811671609;9789811671593

Between 2007 and 2014, IFSTTAR, Alstom and other industrials partners have developed a new concept of railways track called New Ballastless Track (NBT). A first numerical study, using a non-linear model was performed to evaluate the possibility of replacement of the original reinforced concrete layer of the track slab by a steel fiber reinforced concrete, to simplify the construction of the NBT track and to take advantage of the redistribution of mechanical stresses on a hyper-static structure. This study led to the conclusion that this replacement was very relevant. This paper is on the optimization of this Fibres Reinforced Concrete Railway Tracks solution by using the same non-linear numerical model. It is shown that this optimization procedure should lead to reduction of CO2 emissions compared with the initial one.

关键词： Railway tracks Fibre reinforced concrete Cracking Carbone footprint

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Research on Some Performance Properties of Hot Mix Asphalt Using Sulfur Dung Quat in Viet Nam 6th

Research on Some Performance Properties of Hot Mix Asphalt U...

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

作者： Nguyen Thu Trang Tran Ngoc Hung Vu The Thuan Bui Ngoc Kien Univ Transport Technol 54 Trieu Khuc St Hanoi Vietnam Thuyloi Univ 175 Tay Son Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Sulfur extended asphalt mixture (SEAM) has been studied applied effectively in some countries. However, this topic has not been deeply investigated in Vietnam conditions. This paper presents experimental results on the performance properties of SEAM with sulfur derived from petroleum refinery Dung Quat (Vietnam). Using sulfur for Hot-mix asphalt (HMA) could reduce temperature of mixing procedure and compaction, which also significantly improved Marshall parameters and rutting resistance of HMA over time of crystallization. Though, the results showed that sulfur extended asphalt reduces the crack resistance of HMA.

关键词： Hot mix asphalt Wheel tracking test Dynamic stability (DS) Rutting depth (RD) CT index

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Fibre Reinforced Mortar (FRM) for in Plane Strengthening of Masonry Panels 10th

Fibre Reinforced Mortar (FRM) for in Plane Strengthening of ...

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

作者： Balsamo, Alberto Di Ludovico, Marco Del Zoppo, Marta Gennaro, Maddaloni Prota, Andrea Morandini, Giulio Univ Naples Federico II Dept Strctures Engn & Architecture Naples Italy Struct Strengthening Line Mapei SpA Milan Italy

ISBN: (纸本)9783030881665;9783030881658

The effectiveness of Fibre Reinforced Cementitious Mortar (FRCM) as strengthening technique of masonry structures under seismic actions has been widely investigated by means of diagonal compression tests in the last decade. The results showed that the effectiveness of FCRM solution, based on the use of FRP grid embedded in mortar matrix, to increase the masonry walls shear capacity strongly depends on the axial stiffness of mesh reinforcement and on the mechanical properties of the matrix. The paper presents preliminary experimental results of tests carried out on specimens strengthened with a new strengthening solution based on the use of Fibre Reinforced Mortar (FRM) without the use of FRP grid. In particular, the strengthening system consists of an innovative high performance and high ductility mortar made by a mix of fibres spread in lime-based powder. The experimental program aims at investigating the soundness of such technique to increase the shear capacity of different masonry panels. In particular, the system was applied over limestone masonry walls with irregular texture, typical of existing buildings in Central Italy, and old-type clay brick masonry panels with regular texture, typical of existing buildings in the Northern Italy .

关键词： Fibre reinforced mortar FRM Diagonal compression tests Existing masonry buildings

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Rapid Heating of Textile Reinforced Concrete: Effect of Textile Coating and Hybrid Textile Layups 10th

Rapid Heating of Textile Reinforced Concrete: Effect of Text...

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

作者： Kapsalis, Panagiotis Tysmans, Tine Triantafillou, Thanasis Univ Patras Dept Civil Engn Struct Mat Lab Patras 26504 Greece Vrije Univ Brussel VUB Dept Mech Mat & Construct Pl Laan 2 B-1050 Brussels Belgium

ISBN: (纸本)9783030881665;9783030881658

The behavior of Textile Reinforced Concrete (TRC) under increased temperatures has been poorly investigated so far and has been a topic of increasing interest in the past decade. The lack of knowledge is even greater when it comes to the behavior of hybrid reinforcement layups, in which different fiber textiles are combined, and the effect of their coating. This paper focuses on the residual tensile behavior of TRC exposed to high temperatures with high heating rates (that correspond to a fire scenario). The investigated parameters are the fiber material (carbon fibers or glass plus carbon fibers) and the textile finishing (coated or uncoated). The specimens (thin tension coupons) were exposed to fire from both sides. Two fire tests were conducted following a standard fire curve (ISO 834) for 7 and 19 min and the reached temperatures at the coupons were approximately 200 degrees C and 300 degrees C, respectively, uniform through the coupons' thickness. The tensile test results that were conducted on the fire exposed coupons, indicated that the temperature effect on the hybrid layup TRCs is relatively small since the tensile strength and the post-cracking stiffness of the material are mainly controlled by the stronger and stiffer carbon fibers, which are unaffected by these temperatures. Additionally, for temperatures of this level, the effect of the coating seems to be limited, since the residual strength of the specimens with coated textiles was almost unaffected. The post cracking stiffness was either unaffected or even increased, depending on the textile finishing.

关键词： High temperature Hybrid layups Fire Textile reinforced concrete Textile coating

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Tensile Behavior of Large Diameter Carbon Fiber Anchors 10th

Tensile Behavior of Large Diameter Carbon Fiber Anchors

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

作者： Tasdemir, Emrah Seracino, Rudolf Kowalsky, Mervyn Nau, James North Carolina State Univ Raleigh NC 27695 USA Bilecik Seyh Edebali Univ Bilecik Turkey

ISBN: (纸本)9783030881665;9783030881658

The use of carbon fiber (CF) anchors is becoming more common in structural retrofit applications. Typically, CF anchors are used to prevent or delay debonding of fiber-reinforced polymer (FRP) laminates from concrete substrates, as in flexural strengthening applications. For seismic repair of reinforced concrete (RC) circular bridge columns, the role of CF anchors is typically to transfer large tensile forces from the column to adjoining members such as a footing or cap beam. Thus, the required CF anchor diameter should be large enough to resist the demand. The research presented in this paper focuses on the tensile behavior of 25 mm-diameter CF anchors to investigate the potential of large diameter CF anchors for seismic repair of RC circular bridge columns. To that end, the behavior of large diameter CF anchors was experimentally investigated through a number of pull tests to identify the impact of fan angle on the tensile rupture capacity. A unique test setup was designed and manufactured to test large diameter CF anchors. Based on the results of this study on commercially available 25 mm-diameter CF anchors, a 530 mm long fan with fan angle between 37 to 57 degrees is recommended with a dowel embedment depth of 380 mm When the anchor fan is well-confined with a transverse CFRP wrap a tensile capacity of 250 kN is achievable.

关键词： Carbon fiber anchor Fan angle Pull tests Efficiency

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A Review of Natural Fiber Concrete for Radiation Shielding 1

引用

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

作者： Yusof, Yusrina Mohd Othman, Siti Amira Univ Tun Hussein Onn Malaysia Fac Appl Sci & Technol Pagoh 84600 Johor Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

As we knew, shielding is important as a protection for radiation. There is many materials used in fabrications of shielding including lead, water and natural fibre. Furthermore, various reinforced concrete has been developed around the world to improve the qualities and performance of concrete in construction and industry. Concrete is known to be strong in compression but weak in tension, which is why reinforcing is utilised to help with this. One technique to improve concrete's performance, particularly in terms of energy absorption capacity, is to incorporate fibres as reinforced concrete. Natural fibre is used to increase the concrete's strength and longevity. As a result, the performance of concrete as a radiation shielding material is automatically improved, and natural fibres are a good reinforcement material in concrete. Natural fibres as reinforcement are the safest and most environmentally friendly option because they cause no harm to the environment, are inexpensive, and may be consumed at any time. As a result, natural fibre is employed as a reinforcement in concrete to improve the shielding material's effectiveness. This paper contains reviews of the past studies undertaken by researchers over the past years or decades which has the similarity either preparation of specimens, machines or techniques used.

关键词： Cogon grass Concrete Radiation Shielding

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Traffic Revenue Risk Identification and Assessment in Build-Operate-Transfer Transport Projects in Vietnam 6th

Traffic Revenue Risk Identification and Assessment in Build-...

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

作者： Truong, Thi My Thanh Nguyen, Nga Thi Univ Transport Technol 54 Trieu Khuc Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

The purpose of this paper is to identify and assess the traffic revenue risks in Build-Operate-Transfer (BOT) transport projects in Vietnam. This will assist project participants in managing these risks effectively in their projects. The study used two different data collection phases to do this, including a literature reviewand a questionnaire survey. The questionnaires were administered to two different primary stakeholder groups comprised public sector authorities (i.e. ministries, department, agencies) and concessionaires involved from conception to operation phase of BOT transport projects in Vietnam. The 15 detected traffic revenue risk indicators were classified into three main components by factor analysis in the study. This study is expected to assist policymakers and other stakeholders in formulating policy recommendations that would favorably impact the development of BOT transport projects in Vietnam and other developing countries.

关键词： Revenue risk Risk management Build-operate-transfer Public-private-partnership Transport projects

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Strengthening in Shear of RC T-beams with CFRP Fabrics: Multilayer Versus Monolayer 10th

Strengthening in Shear of RC T-beams with CFRP Fabrics: Mult...

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

作者： Samb, Ndongo El-Saikaly, Georges Chaallal, Omar Univ Quebec Dept Construct Engn Ecole Technol Super ETS Montreal PQ Canada

ISBN: (纸本)9783030881665;9783030881658

In recent years, manufacturers have developed new heavyweight CFRP sheets as an alternative to multilayer of lightweight CFRP to strengthen important RC structure components. However, there are still design and practical issues that need to be investigated, such as (i) the maximum number of CFRP plies that can be installed without exhibiting slippage or debonding, particularly when bonded on vertical surfaces;(ii) the effectiveness of shear strengthening with multilayer CFRP fabrics compared to a monolayer of equivalent total weight. The present study aims to evaluate and compare experimentally the behavior of reinforced concrete (RC) T-beams strengthened in shear with multilayer lightweight CFRP fabrics to that of a heavyweight CFRP monolayer of equivalent total weight. To this end, nine laboratory tests were performed on eight specimens strengthened with CFRP sheets in U-wrap schemes around the web and bonded continuously along the shear span, and one control specimen with no strengthening. The results are presented in terms of failure modes, gain in capacity due to CFRP, deflection, and strain responses experienced by the externally bonded CFRPs. Finally, the experimental results obtained are compared to the predictions of the current design codes and guidelines.

关键词： RC T-beams Shear strengthening CFRP fabrics Multilayer Monolayer

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Identification of Cost Over Run Issue in Preventive Management in Construction Workplace-Chennai

Identification of Cost Over Run Issue in Preventive Manageme...

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

作者： Balasubramanian, M. Abinaya, T. L. Kumar, V. R. Prasath Gopinath, S. SRM IST Dept Civil Engn Chengalpattu 603203 Tamil Nadu India SRM IST Sch Architecture & Interior Design Chengalpattu 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

Nowadays, construction industry is one of the cannonading industries that has a great impact on the economy of any nation. This report identifies the cost overrun issues in construction companies using preventive management activities in Chennai. A preventive management survey has been conducted in construction companies based on a literature and questionnaire survey. There are many serious hazards in the construction industry, including falling or being struck by heavy construction equipment, combined with the associated financial loss resulting from budget overrun, worker's compensation, indirect cost hikes, and impact of the profitability of any constriction operation. This paper aims to find the influencing factors causing accidents and thereby giving importance to those factors and preventing it from an occurrence. The most influencing factor has been identified through a questionnaire survey. The information has been assessed using statistical analysis to understand the circumstances well which will help scrutinize the factors. The tests such as reliability, ranking by RII (Relative Importance Index), and correlation for all the attributes were found to be good and so the data collected was highly consistent. The correlation test has been done and few factors are highly correlated. The RII has been calculated for every attribute and it has been found that effective preventive management can reduce the indirect cost and also avoid cost overrun and budget overrun. This study also proposes that the government should pay attention to enhancing legal enforcement and organizing safety training programs.

关键词： Construction management Cost overrun RII (Relative importance index) Construction safety Effective preventive management

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Load Deflection Behaviour of Self Consolidating Concrete Beams Prestressed with CFRP Bars 10th

Load Deflection Behaviour of Self Consolidating Concrete Bea...

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

作者： Krem, Slamah Soudki, Khaled El-Gelani, Adel Ahmida, Farhat G. F. Univ Tripoli Tripoli Libya Univ Waterloo Waterloo ON Canada Coll Engn Technol Hoon Libya

ISBN: (纸本)9783030881665;9783030881658

Self-consolidating concrete (SCC) offers several potential benefits that derived from its unique flow characteristics: improved productivity and quality of concrete construction. The current ACI 440.4R-04 design guidelines does not account for SCC in flexural deflection predication of beams prestressed with Fibre Reinforced Polymers (FRP) bars. This paper presents results of flexural testing of four beams prestressed with 12.7 mm Carbon FRP bars. Two beams made from SCC and two beams made from normal vibrated concrete NVC. The prestressing levels were 30% or 60% of the guaranteed tensile capacity of the CFRP bars. Beams were tested under a four-point static bending load under displacement control. Measurements of load, midspan deflection, strain in CFRP bars and in the concrete were collected using a data acquisition system. Results was compared to two methods for flexural deflection predictions: simplified method based on (ACI 440.4R-04), and detailed analytical method from literature. The simplified method was based on effective moment of inertia approximation while the detailed method was based on effective moment of inertia and effective centroid calculations. In both methods, the actual concrete modulus of elasticity was used. Prediction of the midspan deflection based on the simplified method for SCC beams was unconservative after cracking. The experimental results correlated well with the detailed method at higher loads range for both types of concrete.

关键词： Self consolidating concrete Prestressed beams CFRP

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