中文摘要：

纤维增强复合材料（FRP）具有强度高、延性好等优点,但FRP型材及构件仅单向力学性能优异,横向强度和刚度均较小,且横向更易发生屈曲破坏。本文对不同支承板宽度的矩形中空截面聚氨酯拉挤型材开展了腹板压屈试验,横向荷载作用下中空拉挤型材破坏模式为翼缘凹陷屈曲,腹板中部两侧延伸裂缝。支撑板宽度对于提高构件的极限承载力极为显著。汇总国内外关于基于设计的计算公式,将不同计算公式对拉挤型材的计算误差进行了探讨和分析。结果表明：文献[10]提出的计算公式比较接近试验值,其他计算公式均与试验值偏差较大。

英文摘要：

Fiber reinforced plastics（ FRP） have the advantages of high strength and good ductility.However,FRP profiles and components have only one-way mechanical properties,transverse strength and stiffness are low,hence the lateral deformation is more prone to buckling. In this paper,the web compression test was carried out on the rectangular cross section polyurethane pultruded section with different width of the support plates.The failure mode of the hollow pultruded profile under the transverse load was the flexion of the flange and the extension of the middle of the web. The width of the support plate was extremely significant for increasing the ultimate bearing capacity of the components. Based on the design formula,the calculation error of pultruded profiles was discussed and analyzed by different calculation formulas.The results show that the calculated results proposed by the paper [10] is close to the experimental results,and the other formulas are different from the experimental results.