一、引言截面最小配筋率是指钢筋混凝土构件的极限承载能力与相同截面纯混凝土构件的极限承载能力相等时的配筋率。确定钢筋混凝土构件的极限承载能力时,不考虑受拉区混凝土参加工作,而受拉钢筋达到屈服强度,且受压混凝土达到其极限强度。确定纯混凝土构件的极限承载能力时,考虑受拉区混凝土进入塑性工作阶 I. INTRODUCTION The minimum reinforcement ratio of cross-section refers to the ratio of reinforcement when the ultimate bearing capacity of reinforced concrete members is equal to the ultimate bearing capacity of pure concrete members of the same cross-section. When determining the ultimate bearing capacity of reinforced concrete members, the work of concrete in the tension zone is not considered, and the tensile strength of the tensioned steel reaches the yield strength and the ultimate strength of the concrete under compression is reached. To determine the ultimate bearing capacity of pure concrete components, consider the tension zone concrete into the plastic work order