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以截面形式、截面长宽比和混凝土类型为参数共设计了8根矩形中空夹层钢管混凝土试件,对其进行轴压实验并对其破坏形态、荷载-纵向应变关系曲线及外钢管横向应变发展规律进行分析。其中截面形式包括矩形套矩形和矩形套圆形两种,截面长宽比分别为1.25和1.5,混凝土类型包括普通混凝土和再生混凝土(再生粗骨料取代率为50%)两类。结果表明:对于截面形式相同的试件,长宽比较大者极限承载力更小,且其长边横向应变发展更快;对于长宽比相同的试件,矩形套矩形截面的试件长边横向应变发展比矩形套圆形截面的更快;混凝土类型对试件的极限承载力和破坏形态影响不大。最后运用有限元软件ABAQUS对8根短柱的轴压全过程进行模拟,并将有限元计算得到荷载-纵向应变曲线与实验实测曲线进行对比,两者吻合较好且互相验证。
A total of eight rectangular hollow-walled CFST specimens were designed with the cross-sectional form, the aspect ratio and the concrete type as the parameters. The axial compression test was carried out and the failure morphology, load-longitudinal strain curve and transverse strain of the outer steel tube were developed Regularity analysis. The cross-sectional forms include rectangular and rectangular sets of rectangular cross-section, the aspect ratio of 1.25 and 1.5 respectively, concrete types, including ordinary concrete and recycled concrete (recycled coarse aggregate replacement rate of 50%) two categories. The results show that the ultimate bearing capacity of the specimens with the same length and width is smaller and the transverse strain of the long edges develops faster. For the specimens with the same aspect ratio, The transverse strain develops faster than that of the rectangular sleeve, and the concrete type has little effect on the ultimate bearing capacity and failure mode of the specimen. Finally, finite element software ABAQUS was used to simulate the whole process of axial compression of eight short columns, and the load-longitudinal strain curves obtained by finite element analysis were compared with the experimental ones. The two agree well with each other and verify each other.