尺寸效应对GFRP管-混凝土-钢管组合柱轴压下力学性能影响的研究

Size Effects on the Mechanical Properties of GFRP-Concrete-Steel Tubular Column under Axial Compression

FRP管-混凝土-钢管组合柱(简称DSTC),是一种新型组合结构形式,它由FRP外管、钢材内管以及两者之间填充的混凝土三部分组成,具有轻质高强耐腐蚀等特点.为了更深入研究DSTC的轴压力学性能,通过2组不同工况下的DSTC短柱轴压力学性能实验,对不同尺寸等工况下的DSTC进行了深入研究.根据实验结果可知,随着试件尺寸的增大,试件抵抗变形能力在减弱,尺寸效应对不同混凝土强度等级的DSTC力学性能的影响程度不同,具体表现为尺寸效应对高等级混凝土的影响要小于较低等级混凝土.

GFRP-concrete-steel tubular column（DSTC）,is a new type of composite structure,which is made up of FRP outer tube,steel tube and concrete filled between them. It has the characteristics of light weight,high strength and corrosion resistance. In order to study the DSTC axial compressive properties,we carried out the DSTC short columns axial compression performance experiment of two groups under different conditions,for in-depth study on DSTC under the different sizes condition. According to results of the experiment,the simulation analysis shows that,with the increase of the dimension,the resistance deformation ability weakened. The impact degrees of size effect on DSTC mechanical properties of different concrete strength grades were different,showing that size effect on high grade concrete was smaller than that of low grade concrete.