题目内容

Test results indicated that the failure of the fillet weld often occur in the weld throat, so the effective thickness of fillet weld he is picked up which is along the direction of , and the effective area is the product of the effective thickness and the weld calculation length.

A. 30°
B. 45°
C. 60°
D. 75°

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The surface of ordinary bolt is rough, and a large space exist between bolt bar and bolt hole, which may lead to a large shear slip.

A. Grade A
B. Grade B
C. Grade C
D. Grade D

The failure modes of ordinary bolts include: when the diameter of the bolt is small and the plate is thick, the bolt may be .

A. cut off
B. crushed down
C. split by tension
D. damaged by bending

Under the action of external force, the contact surface of the member tends to separate. At this time, the bolt is subjected to the along the axial direction, so the failure is the split of the bolt bar at tension.

A. shear force
B. pulling force
C. compression
D. torsion

For friction-type connections, part of the shear force is transferred by the contact surface in front of the hole, which accounts for of the bolt's transfer force, so the calculation formula of the net cross section can be obtained.

A. 25%
B. 50%
C. 75%
D. 100%

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