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【单选题】
某砌体建筑物的地基基础设计等级为丙级，采用墙下钢筋混凝土条形基础，基础尺寸如图所示，基础顶面处相应于作用的标准值为：永久荷载轴压力F＝300kN／m，可变荷载轴压力FQk=136kN/m，可变荷载的组合值系数为0.7，基底以上基础与土的平均重度为20kN/m 3 。 假定基础混凝土强度为C20，钢筋的混凝土保护层厚度为40mm，基础高度h=500mm，采用HRB335级钢筋（fy=300N/mm 2 ），底板单位长度的最大弯矩设计值为100kN·m.确定底板单位长度的抗剪承载力设计值Vu（kN）、受力主筋截面面积AS（mm 2 ），最接近下列（）项。A.
315kN；805mm 2
B.
350kN；805mm 2
C.
315kN；1814mm 2
D.
350kN；814mm 2
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