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为研究圆截面Q460高强钢混凝土组合柱在小偏压作用下的受力性能,进行了两根组合柱的工程性试验,对其破坏过程及特征进行分析,结果表明,钢骨有效限制剪切斜裂缝的发展,组合柱发生弯曲破坏,表现出良好的延性;采用有限元方法分析钢骨应力分布与变化规律,结果表明,混凝土压溃失效引起钢骨应力重分布,加剧了钢骨部分承担轴力和弯矩;对型钢屈服强度、含钢率进行有限元参数分析,结果表明,采用高强钢可有效提高承载力,同时控制构件截面尺寸与自重;对计算SRC柱压弯承载力的两种主要方法进行了比较分析,提出等效矩形概念的简化计算,为圆截面SRC柱设计提供依据.
In order to study the mechanical behavior of Q460 high-strength steel-reinforced concrete (CFST) composite column under small bias, the engineering tests of two composite columns were carried out and the failure process and characteristics were analyzed. The results show that the effective limiting shear The development of oblique cracks and the bending failure of composite columns show good ductility. The stress distribution and variation of the steel are analyzed by finite element method. The results show that the failure of concrete caused the stress redistribution of the steel, which aggravates the part of the steel Axial force and bending moment. The results of the finite element analysis of the yield strength and steel content of the section steel show that using high-strength steel can effectively increase the bearing capacity and control the section size and self-weight of the component. The main methods were compared and analyzed. The simplified calculation of equivalent rectangular concept was proposed, which provided the basis for the design of SRC column with circular section.