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

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Determination of a Large-Diameter Carbon Fiber Anchor Capacity 10th

Determination of a Large-Diameter Carbon Fiber Anchor Capaci...

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

作者： Al-Doori, Al-Hakam Rashid, Raizal S. M. Tasdemir, Emrah Seracino, Rudolf Univ Putra Malaysia Dept Civil Engn Serdang 43400 Malaysia North Carolina State Univ Dept Civil Construct & Environm Engn Raleigh NC 27695 USA Bilecik Seyh Edebali Univ Dept Civil Engn TR-11230 Bilecik Merkez Bilecik Turkey

ISBN: (纸本)9783030881665;9783030881658

The use of fiber-reinforced polymer (FRP) materials has become a key to enhancing the performance of existing structural elements. Debonding is a common failure mode when FRP sheets are used for the flexural or shear strengthening of reinforced concrete (RC) members. Anchoring the end of FRP sheets with carbon fiber (CF)-reinforced spike anchors, which are typically small, is a proposed method to prevent or delay debonding failure. In the case of seismic strengthening or repair, large-diameter CF anchors are required due to the high demand on structural members. Given the limited available data on large-diameter CF anchors, a challenge in this field is the use of large-diameter CF anchors for conventional RC structures exposed to seismic events. Thus, a testing program was developed to examine the behavior of large-diameter CF anchors. The behavior of CF anchors was examined via a pull-out test for various fanning angles ranging from 45 degrees to 60 degrees. The obtained test data for a given fan angle can be used to enhance the performance of RC structural members in terms of resisting seismic events.

关键词： Carbon fiber anchor Seismic repair Fan angle

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Modelling the Bond of GFRP Bar and Concrete for the Thermo-mechanical Behaviour of RC Slabs 10th

Modelling the Bond of GFRP Bar and Concrete for the Thermo-m...

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

作者： Veljkovic, Ana Carvelli, Valter Rezazadeh, Mohammadali Politecn Milan Dept Architecture Built Environm & Construct Engn Milan Italy Northumbria Univ Dept Mech & Construct Engn Newcastle Upon Tyne Tyne & Wear England

ISBN: (纸本)9783030881665;9783030881658

Present study aims to develop a 3D thermo-mechanical numerical model to better understand the influence of elevated temperature on the bond between the GFRP bars and concrete in RC structural elements. The relevant constitutive thermal and mechanical parameters of the bond were calibrated using experimental measurements, including pull-out tests under different elevated temperatures. The accuracy of the numerical thermo-mechanical predictions was first confirmed by pull-out test simulation, then the modelling strategy was transferred to RC thin slabs. Good accordance of experimental and numerically predicted temperature fields was followed by the verification of the complete methodology through comparison of experimental and numerical thermo-mechanical slabs' response. The relevant laboratory experimental measurements and observations confirmed the accuracy of the developed numerical modelling, emphasizing the importance of proper selection of material parameters and their temperature dependencies. This work contributes to the improvement of simulation strategies for GFRP RC structures in elevated temperature environments and tends to increase the confidence in adopting GFRP reinforcement bars in concrete design.

关键词： GFRP bar RC slab Bond Thermo-mechanical behaviour Finite element modelling

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Strengthening of Concrete Structures Using Prestressed FRP - A Review 10th

Strengthening of Concrete Structures Using Prestressed FRP -...

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

作者： El-Hacha, Raafat Awassa, Oumaima Univ Calgary Dept Civil Engn Calgary AB Canada

ISBN: (纸本)9783030881665;9783030881658

Fibre-reinforced polymers (FRP) reinforcement has been used for flexural strengthening either as an externally bonded (EB) system in the form of FRP laminate (sheets, plates or strips) applied to the tension side of reinforced concrete (RC) members or as a near-surface mounted (NSM) system. The NSM system is composed of an FRP strip or bar embedded inside a pre-cut groove filled with epoxy. The groove is made into the concrete cover at the tension side of the RC member. Although flexural strengthening using non-prestressed FRP reinforcement increases the ultimate strength of a member, it does not significantly improve the member performance under service loads (i.e. it does not increase the stiffness of the member under service loads). This is because non-prestressed FRP strengthening is a passive strengthening technique where the FRP remains inactive until additional loads are applied. To increase the stiffness of the member, the strengthening system must be active rather than passive. Active strengthening is achieved by prestressing the FRP reinforcement before being bonded to the concrete. The advantages of prestressed FRP strengthening are (i) more effective use of the material because a greater portion of its tensile capacity is employed, and (ii) the FRP material contributes to the load-bearing capacity under both service and ultimate conditions. Prestressing the EB and NSM FRP requires a special anchorage system that should be practical in implementation. In general, prestressing is used to enhance the flexural behaviour of reinforced concrete members under service loads, especially in bridges and beams with large spans. There is a limitation on the deflection and serviceability conditions. Because of their high tensile strength properties, FRP materials have significant advantages for use in prestressing and post-tensioning strengthening applications. The specialized application of prestressing the FRP reinforcement for flexural strengthening of structures c

关键词： Active Anchorage Flexural Prestressing Externally bonded Near-surface mounted

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Experimental Investigation of a Novel Circular Anchor System for Prestressed CFRP Plates 10th

Experimental Investigation of a Novel Circular Anchor System...

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

作者： Tan, Cheng Han, Song Dai, Shaolei Shang Horse Construct Co Ltd Shanghai Peoples R China

ISBN: (纸本)9783030881665;9783030881658

Prestressed carbon fiber reinforced polymer (CFRP) system has been extensively studied and applied in strengthening industry. Various anchor systems have been developed to prevent premature failure of prestressed CFRP composites. Current prestress CFRP anchor system are classified as epoxy based and mechanical anchors. Most anchoring systems are designed for thin or narrow CFRP plates. The anchoring efficiency of large cross-section CFRP is very limited. It is imperative to develop an effective, easy installable anchor system for relative large cross-section CFRP plate. Under this background, a novel circular wedge anchoring system was developed and tested for popular 3 * 50 mm prestressed CFRP plate. This paper presents an experimental investigation of the proposed anchor system, mechanical performance and applicability are discussed and reported. Test result showed that material property, tooth pattern, and wedge angle have notable effect on failure modes and anchor capacity. The high capacity, small dimension, light weight and convenient installation characters of the proposed system contributes future promotion of prestressed CFRP strengthening technology.

关键词： Presstressed CFRP Anchor system Circular wedge Experimental tests

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Improving the Seismic Performance of Structural Steel Systems Through Advanced Testing 10th

Improving the Seismic Performance of Structural Steel System...

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

作者： Ricles, James Lehigh Univ Bethlehem PA 18015 USA

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Recent earthquakes in many parts of the world have resulted in damage to the civil infrastructure, resulting in fatalities and economic loss. This experience has resulted in stake holders demanding a more resilient infrastructure and the mitigation of earthquake hazards to minimize their impact on society. Researchers have developed concepts for structural steel systems to promote resilient performance. Real-time hybrid simulation (RTHS) provides an experimental technique to meet the need to validate new concepts. RTHS enables a complete structural system, including the soil and foundation to be considered in a simulation, interaction effects and rate dependency in component and system response to be accounted for, and realistic demand imposed onto the system for prescribed hazard levels. This paper presents the concept of RTHS and developments achieved at the Lehigh NHERI Experimental Facility that have advanced RTHS to enable accurate large-scale, multidirectional simulations involving multi-natural hazards to be performed. The role that hybrid simulation has played in these developments and how its use has enabled a deeper understanding of structural system behavior under seismic and wind loading will be discussed. Examples include self-centering steel moment resisting frame systems, braced frame systems with nonlinear viscous, and tall buildings with outriggers that are outfitted with nonlinear viscous.

关键词： Real-time hybrid simulation Multi-hazards Advanced multidirectional testing Resiliency Unconditional stable dissipative direct integration algorithms

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Assessment of Traffic Performance at Toll Plaza Using Microsimulation-A Case in Vietnam 6th

Assessment of Traffic Performance at Toll Plaza Using Micros...

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

作者： Doan, Duc Ho Chi Minh City Univ Transport Dept Transport Planning Ho Chi Minh City Vietnam

ISBN: (纸本)9789811671609;9789811671593

Toll plaza is considered conventional toll collection, which is manual and the most common toll collection method in Vietnam. This study attempts to analyze the traffic performance of toll plaza by using the microsimulation software VISSIM. At the selected toll plaza, An Suong-An Lac toll plaza, Hochiminh City, traffic data including traffic volume, traffic composition and service time are collected at toll booths for all types of payment. A suggested solution is conducted to enhance the level of service of the selected toll plaza. The output of this study indicates that the best solution for reducing queue length, vehicle day at toll plaza is to change the payment type from manual method to Electric Toll Collection (ETC) method.

关键词： Toll plaza Microsimulation VISSIM Traffic performance Electronic toll collection

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Iron-Based Shape Memory Alloy (Fe-SMA) vs. CFRP for Prestressed Strengthening of civil Metallic Structures 10th

Iron-Based Shape Memory Alloy (Fe-SMA) vs. CFRP for Prestres...

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

作者： Ghafoori, E. Hosseini, A. Michels, J. Izadi, M. R. Pellissier, E. Swiss Fed Labs Mat Sci & Technol Empa Struct Engn Res Lab Dubendorf Switzerland Univ Cambridge Dept Engn Trumpington St Cambridge CB2 1PZ England Univ Calif Davis Dept Civil & Environm Engn Davis CA 95616 USA Re Fer AG Brunnen Switzerland Univ New South Wales Sch Civil & Environm Engn UNSW Sydney NSW Australia S&P Clever Reinforcement Co AG Schwyz Switzerland

ISBN: (纸本)9783030881665;9783030881658

Iron-based shape memory alloy (Fe-SMA) is a smart material that has been recently engineered and developed for civil engineering applications. The FeSMA has become a new reinforcement material for prestressed-strengthening of structures. This article aims to provide the first systematic study on the comparison between these two reinforcement materials with a particular emphasis on conditions imposed in civil engineering. The production procedure, mechanical properties, fatigue, creep/relaxation, corrosion, thermal expansion, high-temperature and fire behavior of the Fe-SMA in comparison with those of carbon fibre-reinforced polymer (CFRP) material are discussed. In the next step, the static and fatigue behavior of different structural components strengthened by prestressed CFRPs or activated Fe-SMAs are explained. Finally, a cost analysis is carried out to compare the two strengthening solutions (with Fe-SMA and CFRP) for prestressed-strengthening of 6.4-m girders. The cost comparison revealed that although the current price of the Fe-SMA strips is higher than that of the normal modulus CFRP plates, both of the strengthening solutions are found to be almost equivalent from a cost-performance point of view, when the achievable prestressing force and the cost of the mechanical clamping systems are taken into consideration.

关键词： Prestressed strengthening CFRP composite Fe-SMA reinforcement High-cycle fatigue Cost comparison

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Flexural Behaviour of RC Beams Strengthened with Post-tensioned CFRP Strips with Various Prestressing Level 10th

Flexural Behaviour of RC Beams Strengthened with Post-tensio...

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

作者： Piatek, Bartosz Siwowski, Tomasz Rzeszow Univ Technol Dept Rd & Bridges Fac Civil Environm Engn & Architecture Rzeszow Poland

ISBN: (纸本)9783030881665;9783030881658

The paper presents the results of the research on a series of reinforced concrete beams strengthened with the new Polish CFRP post-tensioning system with various prestressing levels (force). The tests included four RC beams with a rectangular cross-section of 0.50 m x 0.42 m and a length of 6.0 m. The first beam was a reference (control) beam. The next three beams were strengthened by prestressing with two CFRP strips. Prestressing level is defined as a ratio of prestressing force to the characteristic ultimate tensile strength of CFRP strip. Tested beams were prestressed with 30%, 40% and 50% of CFRP tensile strength which corresponds to a force of 162 kN, 216 kN and 268 kN for subsequent beams. The beams were investigated in a full range of flexural behaviour, including post-debonding phase. The results indicate that changing of prestressing level has a significant influence on behaviour of prestressed beams. The beams strengthened with higher prestressing level exhibited a higher cracking, and steel-yielding moments as well as slightly higher level of CFRP utilisation. Changing the strip prestressing level did not affect the load-bearing capacity of the beams. Beams with different prestressing levels exhibited similar flexural behaviour until strip debonding. Differences occurred in post-debonding phase of work. The higher prestressing level, the failure mode of the beams was more sudden. On the basis of the failure mode of the tested beams, the optimal prestressing level of the CFRP strip in the new prestressing system was determined.

关键词： CFRP strips Prestressing level RC beams Strengthening system

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Rapid SIF Calculation of Inclined Cracked Steel Plates Bonded with CFRP Materials, Prestressed and Non-prestressed 10th

Rapid SIF Calculation of Inclined Cracked Steel Plates Bonde...

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

作者： Li, Lingzhen Chen, Tao Liu, Ruoyu Tongji Univ Key Lab Performance Evolut & Control Engn Struct Minist Educ Shanghai 200092 Peoples R China Tongji Univ Dept Struct Engn Shanghai 200092 Peoples R China Univ Corp Polar Res Beijing 100875 Peoples R China

ISBN: (纸本)9783030881665;9783030881658

Stress intensity factor (SIF) is a fundamental parameter in evaluating the fatigue crack propagation of steel structures. This paper focuses on the theoretical SIF calculation of steel plates with an inclined crack, subjected to tensile fatigue loading. Erdogan and Sih's equations for calculating the mixed-mode I/II SIF are extended to the bonded strengthening of steel plates using non-prestressed and prestressed CFRP. The prestress loss caused by the compression of the steel plate is considered. The theoretically calculated SIFs are proven to be in very good accordance with the numerical simulation. Due to the fact that all mixed-mode fatigue cracks develop soon to the tensile predominant mode under tensile fatigue loading, a simplified method is proposed for fatigue life estimation, in which the cracks propagate under mixed-mode in the very beginning and then perpendicular to the loading direction. The simplified method shows a fairly good capability of the fatigue life estimation.

关键词： Stress intensity factor (SIF) Carbon fiber reinforced polymer (CFRP) Fatigue life Inclined crack Prestress Unbonded and bonded fatigue strengthening

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Effect of Surface Moisture Content on the Durability of Silane-Type Surface Penetration Layers During the Material Application 6th

Effect of Surface Moisture Content on the Durability of Sila...

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

作者： Kondo, Takuya Nomura, Yuta Mizutani, Shinya Nakamoto, Yoshihiko Yokoi, Katsunori Kochi Coll Natl Inst Technol Nankoku Kochi Japan Daido Corp Osaka Osaka Japan

ISBN: (纸本)9789811671609;9789811671593

The application of silane-type surface penetrants immediately after concrete demolding shortens the construction period to enhance the efficiency of the process. However, a high water content is expected immediately after concrete casting, and the durability is low in the penetrating layer. In this study, specimens are prepared to evaluate the surface water content during the application of silanetype surface penetrants. Then, water absorption and saltwater immersion tests are conducted after the sample are irradiated using a xenon lamp. The ability of specimens with high water content to prevent the invasion of deterioration factors is shown to reduce significantly after the irradiation. Hence, it was the surface moisture content during application can affect the durability of silane-type surface penetration layers.

关键词： Silane-type surface penetrants Xenon irradiation Surface water content Water absorption Saltwater immersion

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