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一简支梁,跨度中点承受集中载荷F,已知载荷F=35kN,跨度l=3m,弹性模量E=200GPa许用应力[σ]=160MPa,
A.16工字钢。抗弯截面系数WZ=1.41×10-4m3,截面惯性矩I=1130×10-8sm4
B.18工字钢,抗弯截面系数WZ=1.85×10-4m3,截面惯性矩I=1660×10-8m4
C.20a工字钢,抗弯截面系数WZ=2.37×10-4m3,截面惯性矩,一2370×10-8m4
D.20b工字钢,抗弯截面系数WZ=2.50×10-4m3,截面惯性矩I=2500×10-8m4
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