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Mechanism of improving ductility of high strength concrete T-section beam confined by CFRP sheet subjected to flexural loading

ISSN号：1000-131X
期刊名称：《土木工程学报》
时间：0
分类：TU375.1[建筑科学—结构工程] TU528.31[建筑科学—建筑技术科学]
作者机构：[1]Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China, [2]The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited Dalian Office, Dalian 116600, China
相关基金：Foundation item： Project（51121005） supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China; Project（50878035） supported by the National Natural Science Foundation of China

作者：王苏岩[1], 王泽源[2]

关键词： T型截面梁, 碳纤维布, 高强度混凝土, 高延性, 弯曲载荷, 碳纤维复合材料, FRP片材, 抗震加固设计, high strength concrete, fiber reinforced polymer, T-section, beam, ductility, plastic hinge

中文摘要：

For the purpose of inventing a new seismic retrofitting method for the reinforced high strength concrete (HSC) T-section beam using carbon fiber reinforced polymer (CFRP) sheet, three series, a total of twelve T-section beams with nine specimens confined by CFRP sheet in the plastic zone and three control beams were conducted up to failure under four-point bending test. The effectiveness of confining CFRP sheet on improving the flexural ductility of unstrengthened T-section beams was studied. The parameters such as the width and the thickness of CFRP sheet and the type of T-section were analyzed. The experimental results show that ductility and rotation capacity of plastic hinge can be improved by the confinement of CFRP sheet, and the ductility indices increase with the increment of width and thickness of CFRP sheet. A plastic rotation model considering the width of CFRP sheet and the effect of flange of T-section beam is proposed on the basis of the model of BAKER, and the test results show a good agreement with the perdicted results. The relevant construction suggestions for seismic retrofitting design of beam-slabs system in cast-in-place framework structure are presented.

英文摘要：

For the purpose of inventing a new seismic retrofitting method for the reinforced high strength concrete （HSC） T-section beam using carbon fiber reinforced polymer （CFRP） sheet, three series, a total of twelve T-section beams with nine specimens confined by CFRP sheet in the plastic zone and three control beams were conducted up to failure under four-point bending test. The effectiveness of confining CFRP sheet on improving the flexural ductility of tmstrengthened T-section beams was studied. The parameters such as the width and the thickness of CFRP sheet and the type of T-section were analyzed. The experimental results show that ductility and rotation capacity of plastic hinge can be improved by the confinement of CFRP sheet, and the ductility indices increase with the increment of width and thickness of CFRP sheet. A plastic rotation model considering the width of CFRP sheet and the effect of flange of T-section beam is proposed on the basis of the model of BAKER, and the test results show a good agreement with the perdicted results. The relevant construction suggestions for seismic retrofitting design of beam-slabs system in cast-in-place framework structure are presented.

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