go to jove.com

HIGH SCHOOL

Engineering

Concept Videos

Mechanical Engineering

This is a free preview. For full access

Deflection of Beams

Moment-Area Method for Cantilever Deflection

Description

The moment-area method is used in structural engineering to find the slope and deflection of a beam under load. It is especially useful for a cantilever beam with a concentrated load and a moment at the free end.

The analysis begins with a free-body diagram. This diagram helps calculate the react...

Transcript

可在承受集中载荷和力矩的悬臂梁上应用面积-力矩法,以确定其斜率和挠度。

该过程首先绘制梁的受力分析图,并计算固定端的支座反力。

接下来,绘制弯矩图以确定弯矩为零的位置。

然后绘制 M/EI 图,以确定与 AO 和 OB 两个区段相对应的区域,并根据这些区域相对于 x 轴的位置赋予正号或负号。

应用第一弯矩-面积定理可计算切线之间的夹角,而第二弯矩-面积定理用于确定切向偏差,该偏差等于A点与B点之间区域的总面积对通过B点的垂直轴的首次矩。

最后,确定 B 点的挠度,该挠度等于切向偏差。然后绘制梁的变形形状,以直观理解其变形情况。 

Tags