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简要阐明了火灾条件下,钢筋的微观结构、屈服强度、弹性模量等主要力学性能指标的变化情况,分析了火灾对建筑中最常见的预应力钢筋力学性能的影响,指出了预应力钢筋和一般钢筋在受火后的力学性能变化差异,分析了不同厚度的混凝土保护层对钢筋力学性能的保护效果.
The changes of the main mechanical properties such as the microstructure, yield strength and elastic modulus of the rebar under fire were briefly stated. The influence of fire on the mechanical properties of the most common prestressed rebar in the building was analyzed. The influence of prestressed rebar and The difference of mechanical properties of general steel bars after fire is analyzed. The protective effect of concrete cover with different thicknesses on the mechanical properties of steel bars is analyzed.