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
举一反三
- 图示等直杆两端固定。设AC、CD、DB三段的轴力分别为FNl、FN2,FN3,则() A: FNl=FN3=-P,FN2=0 B: FNl=FN3<0,FN2>0 C: FN1=FN2=FN3=0 D: FNl=FN3=0, FN2=P
- 图示等直杆两端固定。设AC、CD、DB三段的轴力分别为FNl、FN2、FN3,则 。[img=1313x740]180311eac91c967.jpg[/img] A: (A) FNl=FN3=0, FN2=P; B: (B) FNl=FN3=-P,FN2=0; C: (C) FNl=FN3<0,FN2>0; D: (D) FN1=FN2=FN3=0。
- 如图所示,杆件受力P作用,分别用FN1、FN2、FN3和σ1、σ2、σ3表示截面I-I、II-II、III-III上的轴力和正应力,则有( )。[img=305x79]180384ec9172fcd.png[/img] A: FN1>FN2>FN3 B: σ1>σ2>σ3 C: FN3>FN1>FN2 D: σ3>σ1>σ2
- 如图所示结构中,假设AC梁为刚杆,杆1、2、3横截面面积相等,材料相同。三杆的轴力分别为FN1= ,FN2= ,FN3= 。(题目1写FN1的值,题目2写FN2的值,题目3写FN3的值)填空1:FN1= [img=310x160]17de93d74762212.png[/img]
- 图示桁架有:FN1=FN2=FN3= 0。https://p.ananas.chaoxing.com/star3/origin/7755ae2c01506409997cd5592302bd81.png
内容
- 0
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
- 2
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
- 3
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
- 4
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