玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5632

K. Roko, T. Boothby, C. Bakis

{"title":"Failure Modes of Sheet Bonded Fiber Reinforced Polymer Applied to Brick Masonry","authors":"K. Roko, T. Boothby, C. Bakis","doi":"10.14359/5632","DOIUrl":"https://doi.org/10.14359/5632","url":null,"abstract":"CFRP reinforcement sheets are proposed as reinforcement for unreinforced brick masonry subjected to out of plane loads. The investigation consisted of testing unidirectional sheet bonded carbon fiber as a reinforcing material for brick masonry prisms. Two types of brick and FRP materials were utilized in these experiments. The masonry materials exhibited high and low porosity, indicated by initial rate of absorption tests, while high and low modulus FRP materials were used. Strain gauge and full field photoelastic strain analysis was conducted to obtain a record of the strain transfer from the FRP to the masonry. From this analysis, a finite element model was then constructed to predict the mode and magnitude of failure. Results indicate that shear failure of the brick or debonding of the FRP were the general failure modes of the composite specimens tested. When comparing the results of different brick types, it is seen that, in the molded brick, the failure mode was shear failure of the brick at the end of the FRP reinforcement. In these specimens, it is clearly seen in the photoelastic strain results that strain transfer in the brick occurred in an area adjacent to the FRP. Failure in the extruded brick specimens was governed by the debonding of the FRP at the interface with the prism. It is conjectured that the viscosity of the epoxy and the porosity of the brick, characterized by initial rate of absorption tests, directly affect the bond of the composite structure and, therefore, the failure mode. Photoelastic results reveal that strain transfer does occur at high loads when the FRP remains bonded to the masonry. A linearly elastic finite element model was generated to match the experimental results and predict the failure mode for future design purposes. This model can be used for various configurations of FRP in the future.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88968718","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: 17

Experimental Investigation on Concrete Confined by Fiber Reinforced Polymer and Comparison with Theoretical Model 纤维增强聚合物约束混凝土的试验研究及与理论模型的比较

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5626

A. Tegola, O. Manni

引用次数: 31

Bending Behavior of Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Polymer Laminates and Subjected to Freeze-Thaw Cycles 冻融循环下碳纤维增强聚合物层合板加固钢筋混凝土梁的弯曲性能

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5654

M. Lopez, A. Naaman, R. Till

引用次数: 9

Externally Bonded Composites for Strengthening Concrete T- Beam Bridges 混凝土T梁桥加固用外粘结复合材料

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5664

S. Morton

引用次数: 1

Experimental and Analytical Investigation of Partially Prestressed Concrete Beams Strengthened with Carbon Reinforcement 碳配筋部分预应力混凝土梁的试验与分析研究

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5659

J. Cha, P. Balaguru, L. Chung

引用次数: 3

Anchorage Design for Externally Bonded Carbon Fiber Reinforced Polymer Laminates 外粘接碳纤维增强聚合物层压板的锚固设计

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5660

K. Brosens, D. Gemert

引用次数: 57

Strengthening Concrete Masonry with Fiber Reinforced Polymers 纤维增强聚合物加固混凝土砌体

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5699

H. Hamilton, A. Holberg, J. Caspersen, C. Dolan

{"title":"Strengthening Concrete Masonry with Fiber Reinforced Polymers","authors":"H. Hamilton, A. Holberg, J. Caspersen, C. Dolan","doi":"10.14359/5699","DOIUrl":"https://doi.org/10.14359/5699","url":null,"abstract":"FRP materials such as carbon, aramid, and glass provide a potentially economical means of strengthening unreinforced and under-reinforced masonry. Potential applications include strengthening for a change in occupancy or load-testing; repair of inadequate construction; or possibly as an alternative reinforcing method for new construction. At the University of Wyoming, seven unreinforced concrete masonry walls were tested in out-of-plane flexure with carbon, aramid, and glass tape reinforcing. The initial three walls were tested with carbon tow sheets, laminates, and aramid tapes applied to the exterior surface of the wall. These initial tests indicated that the FRP strengths were well above the strength of the masonry causing shear failures in the unreinforced masonry. In addition, cost comparisons of the strengthening materials indicated that they were cost-prohibitive when compared to traditional strengthening methods. The four remaining walls were strengthened with narrow strips of unidirectional fiberglass fabric applied to the with epoxy. The objective of the second set of tests was to force a tension failure in the FRP rather than a shear or compression failure in the masonry. The failure modes included fracture of the GFRP, combination delamination/fracture, and complete delamination. Tension tests were also conducted on single lengths of the GFRP tape. The tension test was developed to provide a method of predicting the flexural tensile strength of the GFRP tape. Observed and potential failure modes are presented based on test observations along with a discussion of the desirable failure modes for the strengthening system.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83560973","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: 18

"Edge Effects in Retrofitting of Concrete Beams Using Fiber Reinforced Polymer Stripes—Closed-Form, High-Order Theory Approach" 纤维增强聚合物条加固混凝土梁中的边缘效应——闭合高阶理论方法

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5621

O. Rabinovitch, Y. Frostig

{"title":"\"Edge Effects in Retrofitting of Concrete Beams Using Fiber Reinforced Polymer Stripes—Closed-Form, High-Order Theory Approach\"","authors":"O. Rabinovitch, Y. Frostig","doi":"10.14359/5621","DOIUrl":"https://doi.org/10.14359/5621","url":null,"abstract":"A closed-form high-order analytical approach for analysis of concrete beams strengthened with externally bonded fiber-reinforced polymer (FRP) stripes, on the tensile faces of the RC beam in positive and negative bending moment regions, is presented. The mode is based on equilibrium and compatibility requirements in and between all constituents of the strengthened beam, i.e. the concrete beam, the FRP stripe, the adhesive layers and the interfaces between the various parts. The governing equations of the mathematical model of the strengthened beam are derived and an analytically closed-form solution is determined. A numerical example of a typical continuous reinforced concrete beam strengthened with externally bonded FRP stripes is discussed with emphasis on the shear and transverse normal (peeling) stress concentrations at the adhesive-concrete and adhesive-FRP interfaces at the edges of the FRP stripes. Results concerning the edge stresses at three characteristic locations that have been determined using the closed-form high-order model are discussed. In the sequel a summary, conclusions, and recommendations for the design of the strengthened beam are presented.","PeriodicalId":68258,"journal":{"name":"玻璃钢","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84555386","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

Retrofitting Method for Reinforced Concrete Structures with Externally Prestressed Carbon Fiber Sheets 外预应力碳纤维板加固钢筋混凝土结构的方法

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5669

Zhishen Wu, T. Matsuzaki, K. Yokoyama, T. Kanda

引用次数: 16

New Approach for Punching Shear Capacity Prediction of Fiber Reinforced Polymer Reinforced Concrete Flat Slabs 纤维增强聚合物钢筋混凝土平板冲剪承载力预测新方法

玻璃钢 Pub Date : 1999-08-01 DOI: 10.14359/5617

Abdel Wahab El-Ghandour, K. Pilakoutas, P. Waldron

引用次数: 30

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