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对不同截面形式和不同混凝土类型的6根圆钢管混凝土试件进行试验研究,并对其轴力-纵向应变全过程进行模拟,其中截面形式有圆实心、圆套圆中空夹层、圆套方中空夹层3种,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:截面形式对圆钢管再生混凝土试件的弹性模量、轴压强度和后期延性有一定影响;在达到极限承载力之前,两种混凝土类型的圆钢管混凝土试件的轴压刚度及外钢管的横向应变发展规律基本相同;在达到极限承载力之后,圆钢管再生混凝土试件的延性和后期承载能力均不如相应的圆钢管普通混凝土试件;有限元计算得到的试件的极限承载力和前期刚度与试验结果吻合较好。
Six concrete-filled steel tube specimens with different cross-section and different concrete types were tested and the whole process of axial-longitudinal strain was simulated. The cross-section of the specimens was round and solid, There are three types of interlayer, concrete types include ordinary concrete and recycled concrete (recycled coarse aggregate replacement rate of 50%) two categories. The results show that the cross-section forms have some influence on the elastic modulus, axial compressive strength and post ductility of the concrete specimens of round steel tube. Before the ultimate bearing capacity is reached, the axial compressive stiffness and external After the ultimate capacity was reached, the ductility and the later bearing capacity of the concrete specimens of recycled concrete of round steel pipe were not as good as that of the corresponding ordinary concrete specimens of round steel pipe. The ultimate bearing capacity of the specimens obtained by finite element method And pre-stiffness and test results agree well.