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某高层钢筋混凝土框架结构，抗震等级为一级，混凝土强度等级为C30，钢筋采用 (fyv=270N/mm 2 )。框架梁h0=340mm，其局部配筋如图所示，根据截面底面和顶面纵向钢筋截面面积的比值和截面的受压区高度，试判断关于纵向受力钢筋的配置，并提出其中是正确的配置（）A.
Asl=3Ф25As2=2Ф25
B.
Asl=3Ф25As2=3Ф20
C.
Asl=As2=3Ф22
D.
前三项均非正确配置
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