A=2000×370+370×240=828800mm2
y1=[2000×370×185+370×240×(370+370/2)]/828800=224.6mm
y2=370+370-224.6=515.4mm
I=[2000×224.63+(2000-240)(370-224.6)3+240×515.43]/3=2.031×1010mm4
i=(I/A)1/2=156.54mm
hT=3.5i=3.5×156.54=548mm
山墙间距s=20m>2H=13m,查表得H0=1.0H=6.5m
纵墙为承重墙μ1=1.0
μ2=1-0.4bs/s=1-0.4×2/4=0.8
μ1μ2[β]=1.0×0.8×22=17.6
β=H0/hT=6500/548=11.86<17.6,满足要求。
(2)壁柱间墙高厚比验算
壁柱间距s=4.0m
β=H0/h=2400/370=6.49<17.6,满足要求。