玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5613

S. Park, A. Naaman

引用次数: 0

Seismic Retrofit of Flexural Bridge Spandrel Columns Using Fiber Reinforced Polymer Composite Jackets 纤维增强聚合物复合材料夹套对弯桥拱梁抗震加固

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5684

F. Seible, Donato Innamorato, J. Ḅaumgartner, Karbhari, L. Sheng

{"title":"Seismic Retrofit of Flexural Bridge Spandrel Columns Using Fiber Reinforced Polymer Composite Jackets","authors":"F. Seible, Donato Innamorato, J. Ḅaumgartner, Karbhari, L. Sheng","doi":"10.14359/5684","DOIUrl":"https://doi.org/10.14359/5684","url":null,"abstract":"Large-scale (80%) tests were conducted on one \"as-built\" and four composite jacketed rectangular flexural bridge spandrel columns to assess the effectiveness of different retrofit schemes using fiber reinforced polymer composite jackets. Retrofit challenges were in (1) the unknown response of the inclined interface between spandrel column and the arch rib and (2) the behavior of the column reinforcement lap splice located at the top of the spandrel column pedestal. Three of the four FRP retrofit systems only addressed the lap splice region, where as the fourth system connected the column jacket to the arch rib to improve the column/arch rib interface response. Final damage patterns and failure modes showed that only the latter scheme improve the seismic response whereas the other systems resulted in a sliding failure mode without improving the displacement capacity which for the prototype bridge response is less desirable than the original \"as-built\" lap splice debonding failure. All retrofit schemes successfully clamped the column reinforcement lap splice above the column pedestal construction joint. The tests showed that fiber reinforced polymer composite jacketing systems clearly can be installed without affecting the overall geometry or appearance of the structure, and emphasizes the importance of designing retrofit strategies to control the mode of failure. Retrofitting of one weakness without considering the next mode of failure can lead to ineffective and poor designs.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79367443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Flexural Strengthening of Reinforced Concrete Beams with Carbon Fiber Sheets 碳纤维板对钢筋混凝土梁的抗弯加固

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5666

Y. Takahashi, C. Hata, Y. Sato, T. Ueda, T. Maeda

引用次数: 1

Experimental Study on Bond Strength of Continuous Carbon Fiber Sheet 连续碳纤维片材粘结强度试验研究

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5641

T. Ueda, Yasuhiko Sato, Y. Asano

引用次数: 84

Fiber Reinforced Polymer Prestressed Tension Elements as Reinforcement for Concrete 纤维增强聚合物预应力张拉元件在混凝土中的加固作用

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5674

D. Svecova, A. G. Razaqpur

{"title":"Fiber Reinforced Polymer Prestressed Tension Elements as Reinforcement for Concrete","authors":"D. Svecova, A. G. Razaqpur","doi":"10.14359/5674","DOIUrl":"https://doi.org/10.14359/5674","url":null,"abstract":"The use of FRP for reinforcing is not as popular as its use for prestressing because the modulus of elasticity to strength ratio of most FRP bars is relatively small compared to steel, and the unit price is significantly higher than steel. Therefore, to control deflection and crack width under service conditions, FRP reinforced sections often need to be greatly over-reinforced, which increases the overall cost of the structure. This paper offers an innovative solution to the latter problem by suggesting the use of tension elements as reinforcement. The CFRP tension elements developed in the present investigation are concentrically pretensioned prisms of small cross-section. Such elements would reduce the need for high reinforcement ratio while simultaneously endowing the member with greater flexural rigidity. This paper will briefly explain the concept of FRP prestressed tension elements used for reinforcement of concrete beams, followed by the description of an experimental investigation related to the development of CFRP tension elements and their use as flexural reinforcement in concrete beams. The effectiveness of the tension elements in controlling crack width and deflections under service loads is demonstrated.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81728414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Structural Behavior of Composite Reinforced Concrete Members Encased by Continuous Fiber-Mesh Reinforced Mortar Permanent Forms 连续纤维网增强砂浆永久形式包覆复合钢筋混凝土构件的结构性能

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5615

Y. Sato, S. Fujii, Y. Seto, T. Fujii

{"title":"Structural Behavior of Composite Reinforced Concrete Members Encased by Continuous Fiber-Mesh Reinforced Mortar Permanent Forms","authors":"Y. Sato, S. Fujii, Y. Seto, T. Fujii","doi":"10.14359/5615","DOIUrl":"https://doi.org/10.14359/5615","url":null,"abstract":"While ductile behavior of a reinforced concrete member can be given by flexural longitudinal steel bars, high strength continuous fibers can contribute as shear and confining reinforcement, which can provide excellent durability as well. Composite R/C members encased by fiber-mesh-mortar tubes seem to be therefore one of the most effective systems. In this research, the following aspects of the system were investigated by experimental studies: (a) Tensile behavior of fiber-mesh-mortar plate--Tensile properties of the fiber-mesh-mortar plates were investigated. The test results showed tension stiffening effect which reduced crack spacing. (b) Compressive capacities of concrete columns with fiber-mesh-mortar tubes--Uniaxial compressive tests of concrete columns cast in fiber-mesh-mortar permanent forms were conducted. Improvements in strength and ductility were obtained. The confining effect was governed by fiber type, mesh directions and number of mesh layers. (c) Shear and flexural behavior of composite R/C beams encased by fiber-mesh-mortar tube--Composite R/C beams fully encased by fiber-mesh-mortar tubes were tested. The fiber-mesh-mortar tube reduces surface crack spacing on the lateral sides of the beams and improved shear/flexural capacities.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"10 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91500332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Interface Crack Propagation in Fiber Reinforced Polymer-Strengthened Concrete Structures Using Nonlinear Fracture Mechanics 基于非线性断裂力学的纤维增强聚合物增强混凝土结构界面裂纹扩展

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5683

J. Yin, Z. Wu

{"title":"Interface Crack Propagation in Fiber Reinforced Polymer-Strengthened Concrete Structures Using Nonlinear Fracture Mechanics","authors":"J. Yin, Z. Wu","doi":"10.14359/5683","DOIUrl":"https://doi.org/10.14359/5683","url":null,"abstract":"In this paper, the crack propagation along FRP -concrete interface of FRP-strengthened concrete structures is analyzed by using nonlinear fracture mechanics, in which the concept of mode II fracture is applied to describe the interfacial slip relationship. Two types of the shear stress-slip relationship were proposed, and have been implemented with the mixed finite element methods to perform numerical simulations. A simulation for a simple shear test is carried out to verify the interface crack model. It is found that the interfacial fracture energy is the most important parameter for the bond behavior and the ultimate load can be expressed in terms of the fracture energy. Choosing different bond strength and shear stress-slip relation ship may influence the effective bond length between FRP sheets and concrete. In addition, an example of a FRP-strengthened concrete beam is also analyzed, in which the composite behavior is significantly dependent on the bond strength of strengthened beam, and the debonding propagation and the failure load due to debonding may also be expressed with fracture energy. The fact that cracks are localized or distributed, for plain concrete beams without reinforcing steel bars, is regarded to be affected by bond strength, interfacial fracture energy, concrete tensile strength and mode I fracture energy of concrete.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"434 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91520566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Strengthening Concrete Beams with Prestressed Fiber Reinforced Polymer Sheets: Behavior at Room and Low Temperatures 用预应力纤维增强聚合物板加固混凝土梁:室温和低温下的性能

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5668

R. El-Hacha, Gordon Wight, M. Green

{"title":"Strengthening Concrete Beams with Prestressed Fiber Reinforced Polymer Sheets: Behavior at Room and Low Temperatures","authors":"R. El-Hacha, Gordon Wight, M. Green","doi":"10.14359/5668","DOIUrl":"https://doi.org/10.14359/5668","url":null,"abstract":"When the serviceability of ultimate strength of a reinforced or prestressed concrete beam is assesses to be inadequate, fiber reinforced polymer (FRP) sheets may be suitable for strengthening these beams. FRP sheets exhibit high strength-to-weight ratios and are non-corrosive. When bonded to the tensile face of a concrete beam, FRP sheets supplement the flexural reinforcement of the beam, increasing the beam's strength. To improve the efficiency of this strengthening technique, FRP sheets may be applied with an induced prestress. This paper presents results from an on-going experimental investigation that examines the effectiveness and feasibility of using prestressed carbon fiber reinforced polymer (CFRP) sheets to increase the capacity and improve the serviceability of damaged concrete members. A practical mechanical anchorage system for prestressing the CFRP sheets against the concrete beam is presented and the results of the prestressing process are discussed. The flexural behavior of one 4.5 meter T-section prestressed concrete beam strengthened with prestressed sheets and loaded to failure at room temperature (22 degrees celsius) is presented and compared to that of an unstrengthened control beam. The paper describes the on-going investigation into the behavior of beams strengthened with prestressed CFRP sheets and testes at low temperature (-27 degrees celsius). Aspects of the research program related to the long-term behavior of beams strengthened with prestressed FRP are also discussed.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88532161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Seismic Retrofitting of Reinforced Concrete Columns with Wing Walls Using Carbon Fiber Reinforced Plastic Walls 碳纤维增强塑料墙翼墙钢筋混凝土柱抗震加固研究

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5622

K. Masuo

引用次数: 3

Bond of Glass Fiber Reinforced Plastic Reinforcing Bar for Consideration in Bridge Decks 考虑桥面玻璃钢钢筋粘结的方法

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5640

C. Shield, C. French, J. Hanus

{"title":"Bond of Glass Fiber Reinforced Plastic Reinforcing Bar for Consideration in Bridge Decks","authors":"C. Shield, C. French, J. Hanus","doi":"10.14359/5640","DOIUrl":"https://doi.org/10.14359/5640","url":null,"abstract":"The use of non-metallic bridge deck reinforcement is of interest in regions where corrosion is a problem. A number of manufacturers have developed GFRP rebar for this application. Because the production of the material is relatively new, there is a great deal of variability among the products from different manufacturers. In addition, as the manufacturers continue to develop their own product, variations in GFRP from single manufacturers have been observed. The objective of this study was to investigate the bond between GFRP reinforcement and concrete using inverted half-beam specimen. The inverted half-beam specimen were designed to simulate the conditions likely to be found in a bridge deck (no transverse reinforcement and small concrete cover). Products from two different manufacturers were chosen for the study because of the widely varying characteristics of the product. One manufacturer produced reinforcement with surface deformations created by a helical wrap of glass fibers around the GFRP bar; the other manufacturer developed a ceramic coating that emulated the surface texture of a deformed steel bar. The two different bar types exhibited different bond behaviors. The bond for the bars with the ceramic deformations relied most heavily on mechanical interlock, as was evident from cracking patterns. The bond for the bars with the helical wrap deformations relied most heavily on friction. Both bar types demonstrated large variability for the bond specimen that failed in bar fracture, with some bar failure loads more than two standard deviations below the average bar tensile strength.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89233049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

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