“日”字形截面FRP拉挤型材屈曲性能的研究  

Study on Buckling Behavior of FRP Pultrusion Profiles for "Ribbed"Rectangular Profile

作　　者：李孟宇 潘大荣[2] 陈立 李飞[1] LI Mengyu;PAN Darong;CHEN Li;LI Fei(Chongqing Jiaotong University School of Civil Engineering,Chongqing 400074 China;Nanjing Institute of Technology College of Civil Engineering and Architecture,Nanjing Jiangsu 211167 China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]南京工程学院建筑工程学院,江苏南京211167

出　　处：《江苏建筑》2023年第3期128-132,共5页Jiangsu Construction

摘　　要：文章对“日”字形截面FRP拉挤型材在弯曲荷载作用下的屈曲进行有限元分析,首先对比分析有无加劲肋对屈曲性能的影响,然后以“日”字形截面FRP拉挤型材的翼缘宽厚比、腹板高厚比和截面中心加劲肋距截面中性轴高度为主要变化参数,分析3种参数对“日”字形截面FRP拉挤型材屈曲性能的影响。研究结果表明,设置纵向加劲肋后,屈曲荷载提高36.2%。当翼缘宽厚比≤18.5时,屈曲模式从开始的局部屈曲转向整体屈曲,高厚比≤11.1时为整体屈曲。随着截面中心加劲肋距截面中性轴高度的增加,屈曲荷载先增加后减小再增加,但是与改变结构厚度相比,改变中心截面纵向加劲肋高度对屈曲性能的影响较小。For the finite element analysis of buckling of FRP pultrusion profiles for"Ribbed"Rectangular Profile under bending load,firstly,the influence of unribbed stiffeners and ribbedstiffeners on buckling performance are compared and analyzed.Then,taking the flange width-thickness ratio,web height-thickness ratio and the height of the central stiffener from the neutral axis of the section as the main variable parameters,the influence of the three parameters on the buckling performance of the FRP pultrusion profiles for"Ribbed"Rectangular Profile is analyzed.The results show that the buckling load increases by 36.2%after the longitudinal stiffeners are installed.When the flange width-thickness ratio is≤18.5,the buckling mode changes from local buckling to global buckling.When height-thickness ratio≤11.1,it is the overall buckling.With the increase of the height of the central stiffener from the neutral axis of the section,the buckling load first increases,then decreases and then increases.However,compared with changing the thickness of the structure,changing the height of the longitudinal stiffener of the central section has less impact on the buckling performance.

关 键 词：“日”字形截面FRP拉挤型材 翼缘宽厚比 腹板高厚比 截面中心加劲肋距截面中性轴高度 

分 类 号：TU502[建筑科学—建筑技术科学]