如图所示某一压弯柱柱段,其承受的轴压力,N=1990kN,压力偏于右肢,偏心弯矩M=696.5kN·m。在弯矩作用平面内,该柱段为悬臂柱,柱段长8m;弯矩作用平面外为两端铰支柱,且柱的中点处有侧向支撑。钢材用Q235钢。![](https://img.ixiawen.com/uploadfile/2017/0202/20170202044212250.jpg)
各截面的特性如下:
40c,400×146×14.5×16.5,A=102.0cm2,Iy1=23850.0cM4,iy1=15.2cm;Ix1=727cm4,ix1=2.65cm;
[40a,A=75.05cm2,Iy2=17577.9cm4,iy2=15.3cm;Ix2=592cm4,ix2=2.81cm
整个格构式柱截面特性:A=177.05cm2,y2=46.1cm(截面形心),Ix=278000cm4,ix=39.6cm;Iy=41427.9cm4,iy=15.30cm缀条截面为
56×8,A=8.367cm2,imin=1.09cm。
试问,弯矩作用平面内的轴心受力构件稳定系数φx,与下列何项数值最为接近()
A.0.883
B.0.893
C.0.984
D.0.865