结合型钢再生混凝土受压柱的破坏特征以及再生混凝土的材料特性,根据板的弹塑性稳定理论,对型钢再生混凝土柱受压区再生混凝土保护层不发生失稳时的最小保护层厚度进行了理论推导;同时从再生混凝土保护层开裂的角度,依据力扩散原理和拉断破坏模型,分析了型钢再生混凝土临界开裂保护层厚度的计算方法。研究表明:型钢再生混凝土柱保护层厚度主要与再生混凝土强度等级、型钢再生混凝土柱高、型钢翼缘宽度、再生粗骨料取代率有关。 According to the failure characteristics of recycled concrete columns and the material properties of recycled concrete, according to the elastoplastic stability theory of plates, the minimum thickness of protective layer when the regenerated concrete columns are not buckled in the pressure-resisting section of SRC columns was studied. Based on the theory of force diffusion and fracture failure model, the method of calculating the critical cracked protective layer thickness of reclaimed concrete is analyzed. The results show that the thickness of the protective layer of SRC column is mainly related to the strength of recycled concrete, the height of SRC column, the width of flange and the replacement rate of recycled coarse aggregate.