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为研究圆截面Q460高强钢-混凝土组合柱(SRC柱)在轴心受压作用下的承载力性能以及现有理论计算方法的适用性,对2根实际工程构件缩尺模型进行轴心加载试验,研究SRC柱的破坏方式、裂缝发展及承载力,并通过有限元分析研究了SRC柱加载过程中混凝土部分和钢骨部分的应力变化。对型钢屈服强度、翼缘厚度、腹板厚度以及箍筋间距的变化对SRC柱承载力影响进行有限元参数分析。结果表明:内置钢骨能够有效分担轴力,同时提高组合柱的承载力和延性。对中、欧、美规范理论计算的承载力的比较结果表明,由于未考虑箍筋对混凝土的约束作用,理论值相比有限元结果偏小。根据GB 50010—2010《混凝土结构设计规范》对混凝土强度增大系数的规定,将其计算方法与JGJ 138—2001《型钢混凝土组合结构技术规程》中方法结合来计算轴压承载力,计算值误差控制在10%以内,更适用于高性能钢和高含钢量SRC柱轴心受压设计。
In order to study the bearing capacity of Q460 high strength steel-concrete composite column (SRC column) under axial compression and the applicability of the existing theoretical calculation methods, the axial load tests of two practical engineering component scale models , The failure mode, crack development and bearing capacity of SRC column were studied. The stress changes of concrete and steel part of SRC column were studied by finite element analysis. The influence of the variation of yield strength, flange thickness, web thickness and stirrup spacing on the bearing capacity of SRC columns was analyzed by finite element method. The results show that: the built-in steel can effectively share the axial force and improve the bearing capacity and ductility of the composite column. The comparison of the bearing capacity calculated by the normative theory of China, Europe and the United States shows that the theoretical value is smaller than that of the finite element method because the confinement effect of the stirrup on the concrete is not considered. According to GB 50010-2010 “Code for Design of Concrete Structures” to increase the strength of concrete requirements, the calculation method and JGJ 138-2001 “steel reinforced concrete composite structure Technical Specification” method to calculate the axial compression capacity, calculated value error Control within 10%, more suitable for high-performance steel and high content of SRC steel shaft compression design.