V2EX point load

Point Load

定义 Definition

point load(结构/力学)指集中作用在构件某一“点”(或极小面积)上的荷载,用于与“分布荷载”相对。工程计算中常把实际作用在小范围内的力近似为点荷载。(也常写作 point-load 作定语)

发音 Pronunciation (IPA)

/pnt lod/(美); /pnt ld/(英)

例句 Examples

A single point load can make the beam bend.
一个单一的点荷载就能使梁发生弯曲。

When designing the floor, the engineer checked whether a heavy safe would act as a point load that exceeds the joists’ capacity.
在设计楼板时,工程师核算了一个沉重的保险柜是否会作为点荷载,超过搁栅(楼承梁)的承载能力。

词源 Etymology

该术语由 point(点) + load(荷载/载荷) 组合而成,字面即“点上的荷载”。在结构力学中,它用来表达一种理想化模型:把作用范围很小的外力简化为“集中于一点”,便于建立受力图与计算内力、挠度等。

相关词 Related Words

文学/经典著作中的用例 Literary Works

  • Roark’s Formulas for Stress and Strain(罗克《应力与应变公式》)常用“point load / concentrated load”讨论梁、板在集中力作用下的挠度与应力公式。
  • Mechanics of Materials(Beer & Johnston 等《材料力学》)集中荷载(点荷载)是梁剪力图、弯矩图与挠度分析的基础案例。
  • Structural Analysis(Hibbeler《结构分析》)以点荷载作为典型外载,讲解支座反力、内力与位移计算。
  • Strength of Materials(Timoshenko《材料力学/强度学》相关教材)以集中力模型推导梁的弯曲理论与实验对照。
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