超星 - quiz-10 - 查题吧

单选题

Which of the following cases must consider bending shear stress?

A. The span of the beam is large（l / h > 5）
B. A large load is applied near the support
C. When the bending moment is negative

单选题

The shear stress coefficient circle K is (?).

A. 2
B. 3/2
C. 1.2
D. 4/3

单选题

The shear stress coefficient thin wall tube K is (?).

A. 3/2
B. 2
C. 4/3
D. 1

单选题

The shear stress coefficient Rectangle K is (?).

A. 3/2
B. 2
C. 4/3
D. 1

判断题

The maximum bending shear stress of a cross-section of a transverse bending beam must be located on the neutral axis of the section.

A. 对
B. 错

判断题

When the round bar is bent in two directions, the maximum stress of the beam bending in two planes can be calculated respectively. After superposition, it is the maximum stress of the round bar

A. 对
B. 错

判断题

For the circular section rod, because any diameter passing through the center of the circle is the main axis, the synthetic bending moment of the circular axis can be directly calculated when it is bent in both directions, and then the stress can be calculated according to the plane bending

A. 对
B. 错

判断题

Shear stresses do not only exist on vertical planes in the beam, but also on horizontal planes.

A. 对
B. 错

判断题

So we have zero shear stress at the outer surfaces (where bending stresses are maximum) and maximum shear stress at the neutral axis (where bending stresses are zero.

A. 对
B. 错

判断题

Max bending stress is 4L/h bigger than max shear stress, so shear stress unlikely to cause failure for slender beam!

A. 对
B. 错

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