当前位置:网站首页>[结构力学] 结点承载下影响线与直接承载下影响线不同的原因
[结构力学] 结点承载下影响线与直接承载下影响线不同的原因
2022-06-29 04:25:00 【廉价喵】
一般书本讲的就是
结点承载方式下主梁支座反力和内力影响线的作法:
• 支座反力𝐹𝑅𝐴和𝐹𝑅𝐵的影响线,同上节。
• 𝑀𝐶的影响线,C点正好是结点,同上节。
• 𝑀𝐾的影响线:以下先说明其作法,然后加以证明。
1.作截面K的某量Z在直接移动荷载下的影响线,并
确定与各结点对应的竖标。
2.在两结点之间连以直线,就得到结点荷载作用下的
影响线。

为什么是结点连线,我觉得很简单,就是因为在那两个特殊的结点处剪力会突变,然后又因为剪力是常数,所以弯矩线性变化,所以在这两个特殊结点之间的弯矩是线性的,又已知两端点的值,那么只要一连线就满足了线性条件和端点条件了
但是他还是没有解释为什么两种荷载
我的想法是

但是更进一步的,在两个特殊结点处变化的解析式不想算哈哈哈,因为又要设 Fp 和截面之间的相对距离,想想就麻烦,懒
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