FRP筋混凝土梁挠度的特点及计算方法  

CHARACTERISTICS AND CALCULATION METHODS OF CONCRETE BEAMS REINFORCED WITH FRP BARS

作　　者：徐新生[1] 纪涛[1] 郑永峰[1] 

机构地区：[1]济南大学土木建筑学院,济南250022

出　　处：《工程力学》2009年第A01期171-175,共5页Engineering Mechanics

基　　金：山东省教育厅科技攻关项目(J01E06);济南大学博士基金项目(XBS0838)

摘　　要：FRP(Fiber Reinforced Polymer)筋弹性模量较低且没有明显屈服点,导致FRP筋混凝土梁受荷时产生较大的挠度变形和裂缝宽度,造成多数情况下,适用性要求在设计中起控制作用。在国外有关FRP筋混凝土梁挠度计算方法分析基础上,对2组5个混凝土梁式试件进行了弯曲试验研究。根据试验荷载-挠度关系曲线,以截面开裂弯矩和极限状态的截面弯矩确定的双直线弯矩-曲率关系模型为基础,导出了FRP筋混凝土梁挠度计算公式,计算结果与试验结果吻合较好。The low elastic modulus of FRP bars and their non-yielding characteristics result in large deflections and wide cracks in concrete beams reinforced with FRP bars. Consequently, in many cases, serviceability requirements may play a major role in the design process. Based on analyses of calculation methods for the deflection of FRP concrete beam abroad, the experiment of 2 groups and 5 concrete beams under vertical loads at three-dividing point was conducted. According to the load-deflection curve and an assumed bilinear moment-curvature model determined by the crack moment and the ultimate moment of cross-sections, an analytical formula for predicting the deflection of FRP reinforced concrete beams was proposed, by which the calculated and the experimental results matches well.

关 键 词：双直线弯矩-曲率关系模型 挠度 P-△曲线 FRP筋 混凝土梁 

分 类 号：TU375.1[建筑科学—结构工程]