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【单选题】
某一设有吊车的钢筋混凝土单层厂房，下柱长He=11.5m。上下柱的截面尺寸如下图所示。截面采用对称配筋，as=a's=40mm。采用C30的混凝土，纵向钢筋为 HRB335，内力组合后的最不利内力设计值，上柱是M=112kN·m，N=236kN；下柱是M =400kN·m，N=1200kN。 若已知上柱长Hu=3.6m，则上柱的偏心距增大系数与下列( )项数值最为接近。A.
1.05
B.
1.1
C.
1.16
D.
1.13
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