A. 受压区设置预应力钢筋目的是增强该受压区的强度
B. 预应力混凝土受弯构件的界限相对受压区高度计算公式与钢筋混凝土受弯构件相同
C. 承载力极限状态时，受拉区预应力钢筋均能达到屈服，且受压区混凝土被压溃
D. 承载力极限状态时，受压区预应力钢筋一般未能达到屈服
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