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为研究碳纤维布约束型钢混凝土矩形短柱的轴心受压破坏机理和受力性能,对15个试件进行了轴向静力加载试验,考虑了碳纤维布层数和预压荷载水平两个参数。试验结果表明:所有的约束型钢混凝土柱均以碳纤维布断裂为破坏标志,破坏前有明显的预兆。施加在约束柱上的峰值荷载随碳纤维布层数增加而提高,包裹2层布提高了58.36%,3层提高了64.51%;预压荷载的存在会减弱碳纤维布对短柱的约束效果,且随着预压荷载水平的提高,布的有效拉应变不断减小,柱承载能力不断降低。最后建立了碳纤维布有效拉应变与预压荷载水平的关系式,提出了构件轴压承载能力计算式,计算结果与试验结果吻合良好。
In order to study the axial compression failure mechanism and mechanical behavior of rectangular steel carbon fiber reinforced concrete short columns, fifteen specimens were subjected to axial static loading test, considering the parameters of carbon fiber cloth layers and preloading pressure . The test results show that all the confined steel concrete columns are broken by the carbon fiber cloth as a sign of destruction, and there are obvious signs before the failure. The peak load imposed on the restraint column increased with the number of carbon fiber layers increased, the two layers of cloth wrapped increased 58.36% and the third layer increased 64.51%; Prestressed load would weaken the restraint effect of carbon fiber cloth on the short columns, and With the increase of the preload load level, the effective tensile strain of the cloth decreases continuously, and the carrying capacity of the column decreases continuously. Finally, the relationship between the effective tension strain and the preloading load of CFRP was established, and the calculation formula of axial compressive load carrying capacity was put forward. The calculated results are in good agreement with the experimental results.