图示对称桁架在正对称荷载作用下,杆1、2的内力为()[img=301x250]17e44409dff0de5.png[/img]
A: FN1>;0,FN2>;0
B: FN1<;0,FN2<;0
C: FN1= -FN2≠0
D: FN1=FN2=0
A: FN1>;0,FN2>;0
B: FN1<;0,FN2<;0
C: FN1= -FN2≠0
D: FN1=FN2=0
举一反三
- 【单选题】2 .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 A. FN1=FN2=FN3=0 ; B. FN1=FN2=FN3 ≠ 0 C. FN1= FN3=0 , FN2 ≠ 0 D. FN1=FN3 ≠ 0 , FN2=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
- 图示桁架中,1、2杆的内力为:[img=259x195]17e0adda6464218.jpg[/img] A: FN1>;0,FN2>;0 B: FN1<;0,FN2<;0 C: FN1 = -FN2 D: FN1 = FN2 = 0
- 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
- 图示对称桁架中,杆1与杆2的内力之间的关系是( )。[img=849x424]18033504becadec.jpg[/img] A: FN1=FN2=0 B: FN1=-FN2 C: FN1≠FN2 D: FN1=FN2≠0