期刊
JOURNAL OF COMPOSITES FOR CONSTRUCTION
卷 15, 期 2, 页码 194-205出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)CC.1943-5614.0000125
关键词
Prestressing; Fiber-reinforced polymer; Reinforced concrete; Rehabilitation; Flexural strength; Shear strength; Confinement
资金
- Federal Roads office FEDRO (Astra)
- Swiss National Science Foundation SNF
- innovation promotion agency CTI (KTI)
- Swiss Federal Laboratories for Materials Testing and Research (Empa)
In civil engineering today, only 20 to 30% of the strength of carbon-fiber-reinforced polymer (CFRP) strips is used when they are applied as externally bonded strips for flexural and shear strengthening or in confinement of reinforced concrete (RC) structural elements. The strips are better used when the CFRP material is prestressed. This offers several advantages, including reduced crack widths, reduced deflections, reduced stress in the internal steel, and possibly increased fatigue resistance. In this paper, recent developments in the field of RC strengthening using prestressed CFRP are presented. The paper focuses on developments in flexural and shear strengthening and column confinement made at the Swiss Federal Laboratory for Materials Testing and Research (Empa). Several innovative ideas have been successfully realized in the laboratory. For example, a gradient prestressing technique without end anchorage plates was developed and successfully applied to a 17 m RC bridge girder. A confinement technique using nonlaminated thermoplastic CFRP straps was also investigated and applied to 2 m high RC columns. These results are encouraging, although practical and theoretical problems remain to be solved before these techniques can be fully applied. DOI: 10.1061/(ASCE)CC.1943-5614.0000125. (C) 2011 American Society of Civil Engineers.
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