SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures最新文献_第6页

External Prestressing Concrete Columns with Fibrous Composite Belts 纤维复合带外预应力混凝土柱

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14913

K. N. Nesheli, K. Meguro

引用次数: 7

FRP-Confinement of Hollow Concrete Cylinders and Prisms 空心混凝土柱和棱柱的frp约束

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14879

R. Modarelli, F. Micelli, O. Manni

{"title":"FRP-Confinement of Hollow Concrete Cylinders and Prisms","authors":"R. Modarelli, F. Micelli, O. Manni","doi":"10.14359/14879","DOIUrl":"https://doi.org/10.14359/14879","url":null,"abstract":"Synopsis: The use of hollow-core reinforced concrete (RC) sections for bridge piers has become a popular engineering practice to obtain a reduction of the self-weight (especially in seismic zones) and a better structural efficiency in terms of the strength/ mass and stiffness/mass ratios. In contrast to this popularity in practice, scientific studies on the mechanical behavior of such structural elements are limited. The use of Fiber Reinforced Polymer (FRP) materials for external confinement of hollow core columns and piers is an almost unknown field at the moment. The research work presented herein aims at evaluating the influence of various experimental parameters on the effectiveness of FRP jackets applied to hollow concrete columns. Hollow-core concrete prisms and cylinders were tested under uniaxial compression to study the stress-strain relationship before and after FRP jacketing. A range of experimental parameters were investigated: different concrete strength, type of fibers, number of wrap layers, column shape and dimensions, and for square and rectangular sections, the corner radius and the cross-sectional aspect ratio. Axial strain was measured by LVDTs, while strains in the fibers were recorded by electrical strain gauges. Circular columns wrapped with FRP showed a significant increase in terms of both strength and ultimate displacements. Results obtained by laboratory tests were close to those recorded for FRP-confined concrete, which means that the increase in ultimate load was found to be comparable to that found in full circular sections. Rectangular columns showed a lower increase in ultimate capacity, compared to circular sections, even if the results related to ultimate axial displacement encourage adopting this technique for seismic retrofit to fulfill higher ductility requirements in both prismatic and cylindrical columns.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125124087","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: 42

Concrete Confinement Using Carbon Fiber Reinforced Polymer Grid 碳纤维增强聚合物网格混凝土约束

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14877

A. Michael, H. Hamilton, M. Ansley

{"title":"Concrete Confinement Using Carbon Fiber Reinforced Polymer Grid","authors":"A. Michael, H. Hamilton, M. Ansley","doi":"10.14359/14877","DOIUrl":"https://doi.org/10.14359/14877","url":null,"abstract":"Synopsis: Corrosion of prestressing steel in precast concrete is a significant problem for coastal bridges in Florida. Replacement of prestressing steel with carbon fiberreinforced polymer (CFRP) reinforcement provides a potential solution to this costly problem. The Florida Department of Transportation (FDOT) structures research center has teamed with the University of Florida (UF) to evaluate CFRP reinforced piles that employ two types of carbon reinforcement: (a) CFRP reinforcing bars and (b) CFRP grid. The CFRP bars act as flexural reinforcement while the CFRP grid provides confinement to the concrete core. The focus of this paper is on the confinement provided by the embedded CFRP grid, which is tied into a circular shape and cast into the concrete in a similar configuration to spiral ties. Existing confinement models are based on confinement provided by FRP wraps. Consequently, their use in predicting confinement must be validated with tests on embedded FRP grid. Standard (152 mm x 304 mm) concrete cylinders were cast both with and without the embedded CFRP grid. The cylinders were tested in compression to determine the effect of the CFRP grid on their strength and ductility. A significant improvement in ductility was observed for the cylinders with the embedded CFRP grid compared to the control cylinders.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121288610","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: 16

Material Characterization of FRP Pre-Cured Laminates Used in theMechanically Fastened FRPStrengthening of RC Structures FRP预固化层合板在钢筋混凝土结构机械加固中的材料特性研究

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14829

A. Rizzo, N. Galati, A. Nanni, L. Dharani

{"title":"Material Characterization of FRP Pre-Cured Laminates Used in theMechanically Fastened FRPStrengthening of RC Structures","authors":"A. Rizzo, N. Galati, A. Nanni, L. Dharani","doi":"10.14359/14829","DOIUrl":"https://doi.org/10.14359/14829","url":null,"abstract":"Synopsis: The Mechanically Fastened-FRP (MF-FRP) strengthening system consists of pre-cured FRP laminates having high longitudinal bearing strength attached to the concrete surface using closely spaced steel fasteners in the form of nails or concrete wedge anchors. The connection depends on several parameters such as, the intrinsic laminates properties (tensile and bearing strength), diameter and effective embedment length of the fasteners, clamping force, presence and type of washer, presence and type of filler in the gaps between the FRP material, the fastener and accessories, and the concrete. This paper focuses on the material characterization of pultruded precured laminate which was used as MF-FRP strengthening to retrofit and rehabilitate offsystem bridges in Missouri, USA. Tensile tests, in the longitudinal and transverse direction of the laminate, were performed on full section and open hole coupons in order to characterize the material. Bearing tests, in the longitudinal and transverse direction of the laminate, were performed to determine the capacity of the unrestrained fastener-FRP-concrete connection.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116411570","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: 7

Shear Strengthening of RC Beams with Near-Surface-Mounted CFRP Laminates 近表面贴装CFRP层合板RC梁抗剪加固研究

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14868

S. Dias, J. Barros

引用次数: 9

FRP Stay-in-Place Formwork for Seismic Resistant High-Strength Concrete Columns 高强混凝土抗震柱用FRP现浇模板

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14911

T. Ozbakkaloglu, M. Saatcioglu

{"title":"FRP Stay-in-Place Formwork for Seismic Resistant High-Strength Concrete Columns","authors":"T. Ozbakkaloglu, M. Saatcioglu","doi":"10.14359/14911","DOIUrl":"https://doi.org/10.14359/14911","url":null,"abstract":"Synopsis: Fiber reinforced polymer (FRP) casings, in the form of stay-in-place formwork, provide an attractive alternative to conventional confinement reinforcement for concrete columns. These casings can fulfill multiple functions of; i) formwork, ii) confinement reinforcement, and iii) protective shell against corrosion, weathering and chemical attacks. This paper investigates the use of stay-in-place FRP formwork as concrete confinement reinforcement for HSC columns with circular and square crosssections. Large-scale specimens with 270 mm cross-sectional dimension and up to 90 MPa concrete strength, were tested under combined axial compression and incrementally increasing lateral deformation reversals. FRP casings were manufactured from carbon fiber sheets and epoxy resin. One of the square columns was provided with internal FRP crossties, a new technique introduced by the authors, to provide welldistributed lateral restraints along the column face, thereby improving the mechanism of confinement. The results indicate that the deformation capacity of HSC columns can be improved significantly by using FRP casings. The results further indicate that the confinement effectiveness of casings of square columns is significantly affected by the corner radius of casings. Confinement efficiency of these casings improves with the use of FRP crossties.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123516481","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: 4

Proposed GFRP Connectors inSandwich Panels 夹芯板中建议的玻璃钢连接件

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14823

W. Pong, A. Girgis, M. Tadros

引用次数: 2

Bonded and Mechanically Fastened FRP Strengthening Systems: A Case Study 粘合和机械紧固FRP加固系统:一个案例研究

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14890

A. López, A. Rizzo, N. Galati, A. Nanni

引用次数: 6

Tension Stiffening Behavior of GFRP-Reinforced Concrete gfrp -钢筋混凝土的受拉加劲性能

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14876

H. Sooriyaarachchi, K. Pilakoutas, E. Byars

引用次数: 19

The Influence of Temperature on the Debonding of Externally Bonded CFRP 温度对外粘接CFRP脱粘的影响

SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures Pub Date : 2005-10-01 DOI: 10.14359/14909

E. Klamer, D. Hordijk, H. Janssen

{"title":"The Influence of Temperature on the Debonding of Externally Bonded CFRP","authors":"E. Klamer, D. Hordijk, H. Janssen","doi":"10.14359/14909","DOIUrl":"https://doi.org/10.14359/14909","url":null,"abstract":"Synopsis: Fiber Reinforced Polymers have proven to be effective strengthening materials in the construction industry, due to their low weight (easy to apply), noncorrosiveness and high strength. Extensive research has been carried out into the strengthening of concrete structures with externally bonded FRP. It turned out that debonding of the FRP is governing the design of most FRP strengthening applications. One of the parameters, which may affect the bond properties of the FRP-concrete joint, is the ambient temperature. Only little research into the influence of temperature on the bond behavior has been carried out so far. This paper presents the results of an exploratory experimental and numerical investigation in which the influence of temperature on the debonding behavior of externally bonded CFRP was investigated. Two different test setups were applied. Results showed that the failure load of CFRP strengthened concrete structures was affected by the temperature, but depended on the used test setup. Two types of failure were observed. For low to moderate temperatures (-10°C to +40°C), failure occurred in the concrete, leaving 1-3 mm of concrete attached to the adhesive. For elevated temperatures (50°C to 75°C), failure of the adhesive-concrete interface occurred, without leaving any concrete attached to the adhesive.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132209769","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: 43