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柱下矩形独立承台如图所示。承台底面钢筋保护层为7cm，承台混凝土抗拉强度设计值为ft按照《建筑桩基

技术规范》(JGJ 94—94)计算承台所受到的冲切力设计值F1和承台能提供的抗冲切力R。在下列四种组合中，F1和R的计算结果最接近于 ()。

柱下矩形独立承台如图所示。承台底面钢筋保护层为7cm，承台混凝土抗拉强度设计值为ft按照《建筑桩基技

A．F1=2000kN，R＝3.52ftkN

B．F1＝1000kN，R＝3.52ftkN

C．F1＝2000kN，R＝5.17ftkN

D．F1＝1000kN，R＝5.17ftkN

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