纤维增强复合材料管-混凝土-钢管组合长柱偏心受压试验研究

纤维增强复合材料(FRP)管-混凝土-钢管组合柱(DSTC)是一种有效利用复合材料特点的新型组合构件形式。为揭示该组合构件长柱的偏心受压性能,进行了5个偏心受压试验,主要研究荷载偏心距和FRP管壁厚的影响。试验结果表明:DSTC长柱偏压下的破坏模式均为柱跨中受压侧FRP管环向断裂破坏,且表现出良好的延性;在其他参数相同的条件下,随着荷载偏心距的增大,柱的极限承载力降低,而变形能力增强;随着FRP管壁厚的增大,构件极限承载力提高,变形能力增强。

EXPERIMENT SDUTY OF FRP-CONCRETE-STEEL DOUBLE-SKIN TUBULAR LONG COLUMNS SUBJECT TO ECCENTRIC COMPRESSION

FRP-concrete-steel double-skin tubular column( DSTC) is a new kind of composite column which makes full use of the features of FRP. To study the behavior of the long DSTCs subjected to eccentric compression,this paper presents an experiment of 5 long eccentrically loaded DSTC specimens,mainly studying the impact of the eccentricity of load and thickness of FRP. The test results show that all long DSTC specimens exhibited good ductility and reached their ultimate state by the rupture of the FRP outer tube on the compression side. Under the condition that the other factors are the same,with the increase of the eccentricity,the ultimate bearing capacity of the columns decreased while the deformability can be improved; and with the increase of the thickness of FRP,the ultimate bearing capacity and deformability can both be enhanced.