在钢筋混凝土大偏心受压构件的正截面承载力计算中,要求受压区计算高度x ≥ 2a s ′ ,是为了 ( )
A.
保证受压钢筋在构件破坏时达到其抗压设计强度
B.
保证受拉钢筋屈服
C.
避免保护层剥落
D.
保证受压混凝土在构件破坏是能达到极限压应变
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