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Analysis and Design of Beams for Bending
Sizing Beams for Safe Bending Loads
Description
Prismatic beams have a uniform cross-section, and their design focuses on safe bending under load. The goal is to keep stress within a level the material can handle while the structure stays strong and stable.
The first step is to find the allowable stress for the chosen material. Designers can u...
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Transcript
针对受弯矩作用的棱柱形梁的设计过程,首先需要确定所选材料的许用应力。
允许应力通常从材料性能表或设计规范中获取。或者,也可通过将材料的极限强度除以适当的安全系数来计算。
然后,绘制出与指定载荷条件相对应的剪力图和弯矩图。
接下来,利用剪力图计算弯矩的最大绝对值。
然后利用梁的绝对弯矩值和允许应力计算最小允许截面模量。
设计木梁时,通常会规定表征其横截面形状的比值。通过梁的尺寸与截面模量之间的关系,可确定未知的尺寸参数。
在设计轧制钢梁时,需参考包含轧制钢梁特性的表格,仅考虑那些截面模量大于或等于最小所需截面模量的梁截面。
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