• 2022-06-14
    16.图示等直杆两端固定。设AC、CD、DB三段的轴力分别为FNl、FNFN3,则A.FNl=FN3=0, FN2=Phttp://p.ananas.chaoxing.com/star3/origin/060219aeb55046325e15c345f1e4ca3b.jpg
  • FN1=FN2=FN3=0

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      图示对称桁架在反对称荷载作用下,杆1、2、3的内力为: A: FN1=FN2=FN3=0 B: FN1=FN2=FN3≠0 C: FN1=FN3=0,FN2≠0 D: FN1=FN3≠0,FN2=0

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      对于图示桁架,有:FN1=FN2=FN3=0。http://p.ananas.chaoxing.com/star3/origin/545732725370d289be0a4df1.jpg

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      图示桁架中,1、2、3、4杆的内力为:[img=306x161]17e0adda71c66b3.jpg[/img] A: FN1 = FN2 = 0,FN3 = FN4不等于0 B: FN1 = FN2不等于0,FN3 = FN4 = 0 C: FN1 = FN2不等于0,FN3 = FN4 不等于0 D: FN1 = FN2 = FN3 = FN4 = 0

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      图示桁架中,1、2、3杆的内力为:[img=248x145]17e0adda57e67e9.jpg[/img] A: FN1 = FN2 = FN3 = 0 B: FN1 = FN2 = FN3 均不等于0 C: FN1 = FN3 =0,FN2 不等于0 D: FN2 =0,FN1 = FN3不等于0

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      图示对称桁架在正对称荷载作用下,杆1、2、3、4的内力为:( )[img=363x216]17e4440a1f6e057.png[/img] A: FN1 = FN2 = 0,FN3 = FN4≠0 B: FN1 = FN2≠0,FN3 = FN4 = 0 C: FN1 = FN2≠0,FN3 = FN4≠0 D: FN1 = FN2 = FN3 = FN4 = 0