FRP筋混凝土梁正截面抗弯承载力设计研究  

DESIGN RECOMMENDATIONS ON FLEXURAL CAPACITY OF FRP-REINFORCED CONCRETE BEAMS

作　　者：薛伟辰[1] 郑乔文[1] 杨雨[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《工程力学》2009年第1期79-85,共7页Engineering Mechanics

基　　金：交通部西部交通建设科技项目(200631882244);国家"十一五"科技支撑计划重点课题(2006BAJ16B07)

摘　　要：基于本课题组9根、国内外其他学者102根FRP筋混凝土梁的试验结果以及本课题组完成的38根FRP筋混凝土梁的有限元参数分析结果,对FRP筋混凝土梁的正截面抗弯承载力进行了较系统的研究。研究表明FRP筋混凝土梁的破坏模式有受拉破坏、平衡破坏和受压破坏三种。确定了FRP筋混凝土梁的最小配筋率以及配筋率与破坏模式的关系;给出了FRP筋"名义屈服强度"的计算公式,并较系统地提出了FRP筋混凝土梁正截面抗弯承载力的设计建议。与ACI440.1R-01中的设计方法相比,基于该文设计建议的计算值与试验结果更为接近。9 FRP-reinforced concrete beams were tested under bending moment. Based on the testing results, referring to the results of other experiments, and performing nonlinear finite analysis for 38 FRP-reinforced concrete beams, the flexural capacity of FRP-reinforced concrete beams was analyzed systematically. It is shown that the failure mode of FRP-reinforced concrete beams can be classified as the tension failure mode, the balanced failure mode, and the compression failure mode. This paper suggests the minimum reinforcement ratio of FRP bars as well as the relationship between the reinforcement ratio and the failure mode. The nominal yield strength of FRP bars is also given. Finally, design recommendations for flexural capacity of FRP-reinforced concrete beams are proposed. Compared with ACI 440.1R-01, the proposed formulas yield estimations more close to the experimental results.

关 键 词：结构工程 FRP筋 混凝土梁 正截面抗弯承载力 破坏模式 名义屈服强度 设计建议 

分 类 号：TU377.9[建筑科学—结构工程]