题目内容（请给出正确答案）

[主观题]

In order to properly design a beam, it is import to know the variation of （) and （) along its axis in order to find the points where these values are a maximum.

A、the axial force, torsional moment

B、the axial force, bending moment

C、the shear, torsional moment

D、the shear, bending moment

提问人：网友a034090151 发布时间：2022-01-07

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第1题

form-work

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第2题

¿Quién revolucionó el teatro con sus retratos realistas de la decadente sociedad zarista?

A、Alexandr Pushkin

B、Nikolái Vasílievich Gógol

C、Anton Chejov

D、Fedor Dostoievski

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第3题

Although the choice of a sign convention for a beam is ( ), we will use the one often used in engineering practice. The positive directions are as follows: the distributed load acts ( ) on the beam; the internal shear force causes a ( ) rotation of the beam segment on which it acts; and the internal moment causes ( ) in the top fibers of the segments.

A、specified; downward; clockwise; compression

B、arbitrary; downward; clockwise; compression

C、arbitrary; upward; counterclockwise; compression

D、arbitrary; downward; clockwise; tension

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第4题

The cross section of a straight beam remains plane when the beam deforms due to bending. This causes ( ) on one side of the beam and ( ) on the other side. The neutral axis is subjected to ( ) .

A、tensile stress; compressive stress; zero stress

B、compressive stress; tensile stress; maximum normal stress

C、shear stress; normal stress; zero stress

D、normal stress; shear stress; zero stress

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第5题

Due to the pure bending deformation, the longitudinal ( ) strain varies ( ) from ( ) at the neutral axis to a maximum at the outer fibers of the beam.

A、normal; linearly; zero

B、shear; nonlinearly; zero

C、normal; linearly; maximum

D、shear; nonlinearly; zero

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第6题

Provided the material is ( ) and ( ), due to the pure bending deformation, the stress varies in a ( ) fashion on the cross section.

A、homogeneous; linear elastic; linear

B、nonhomogeneous; linear elastic; linear

C、nonhomogeneous; linear elastic; nonlinear

D、homogeneous; linear elastic; nonlinear

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第7题

For linear-elastic material the neutral axis passes through the ( ) of the cross-sectional area. This conclusion is based on the fact that the resultant ( ) acting on the cross section must be ( ).

A、centroid; axial normal force; zero

B、centroid; shear force; zero

C、centroid; bending moment; zero

D、centroid; axial normal force; maximum

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第8题

The flexure formula is based on the requirement that the ( ) on the cross section is equal to the ( ) produced by the ( ) distribution about the neutral axis.

A、resultant moment; moment; linear normal stress

B、resultant normal force; force; linear normal stress

C、resultant moment; moment; nonlinear normal stress

D、resultant moment; moment; nonlinear shear stress

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第9题

The flexure formula can be applied only when bending occurs about axes that represent the principal axes of inertia for the cross section. These axes have their origin at ( ) and are orientated along ( ), if there is one, and perpendicular to it.

A、the centroid; an axis of symmetry

B、arbitrary point; an axis of symmetry

C、the centroid; an arbitrary axis

D、arbitrary point; an arbitrary axis

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