轴压下GFRP管-混凝土-钢管组合柱的尺寸效应

为了研究尺寸效应对GFRP管-混凝土-钢管组合柱力学性能的影响,在满足几何相似性的条件下,利用静力加载的方法对具有不同试件尺寸、不同混凝土强度等级的8根试件的轴压力学性能进行了试验研究.对8根组合柱试件的试验破坏现象、荷载-应变曲线、极限承载力以及应力值变化进行相应的分析比较,结果表明,随着试件尺寸的增大,试件抵抗变形能力减弱且尺寸效应明显,而增加GFRP管壁厚可以提高试件承载力、增强试件力学性能、减少尺寸效应的影响.

Size effect of GFRP-concrete-steel tubular composite columns under axial compression

In order to study the influence of size effect on the mechanical properties of GFRP-concrete-steel tubular composite columns, the mechanical properties of 8 specimens with different specimen sizes and different concrete strength grades under axial compression were tested and studied with the static loading method under the condition of satisfying the geometrical similarity. In addition, the failure phenomenon, load-strain curve, ultimate bearing capacity and stress value change of 8 specimens of composite columns were analyzed and compared. The results show that with increasing the specimen size, the deformation resistance of specimens decreases, and the size effect is obvious. With increasing the thickness of GFRP tube, the bearing capacity of specimens gets improved, the mechanical properties of specimens get enhanced, and the effect of size effect reduces.