重庆大学学报2016，Vol.39Issue(4)：41-49,9.DOI:10.11835/j.issn.1000-582X.2016.04.006
多点锚固体外无粘结CFRP预应力加固RC梁的抗弯性能
The flexutal ptopetties of RC beams sttengthened with multi-points achoted extetnally unbonded ptesttessed CFRP sheets
摘要
Abstract
Absttact:Three same 7 m span reinforced concrete T-beams were strengthened with an external prestressed strengthening technique.CFRP (carbon fiber reinforced polymer)sheets were not affixed to the beams,but laterally pulled by WSGG (wave-shaped-gear-grip )anchor and gripped at the bottom or two sides of the beams.Two beams were strengthened at two sides,while the other one beam was strengthened at bottom.The flexural propterty test results indicate that the section of the CFRP sheets can be adjusted according to the moment of the beam and the high-strength properties of CFRP materials can be efficiently used.There is no difference in improving the flexural rigidity of the beams either strengthened at two sides or at bottom.The WSGG can anchor the prestressed CFRP sheets well.Based on the test results,we proposed an equation for calculating ultimate load and deflection of beams which are strengthen by externally unbonded prestressed CFRP sheets,and a flexural capacity formula according to the beam plastic hinge zone length limit state of the strengthened beams.And the formula for calculation deflection is derived by considering secondary effects of inertia.Compared with the experimental results,the above formulas are verified and can be used for design.关键词
波形齿/无粘结预应力/预应力/梁/CFRP片材Key words
wave-shaped-teeth-grip/unbonded prestressing/prestress/beam/CFRP sheet分类
建筑与水利引用本文复制引用
陈小英,卓静,李唐宁,陈明政,朱浪涛..多点锚固体外无粘结CFRP预应力加固RC梁的抗弯性能[J].重庆大学学报,2016,39(4):41-49,9.基金项目
国家自然科学基金面上资助项目（51078370）；中央高校基本科研业务费专项资金资助项目（310821161101）。Supported by the National Natural Science Foundation of China（51078370）and the Fundamental Funds for the Central University（310821161101）． （）
