桿件之力表示方式問題 - 土木
By Ingrid
at 2022-02-16T13:05
at 2022-02-16T13:05
Table of Contents
各位版友好
關於求桿件內力的題目有我已經困惑許久
起因於結構學期中考試有一題內容為
http://i.imgur.com/IV0voye.jpg
鉛筆是我當初計算的方式(原本少畫HG)
(我判定的零桿為DE,EF,FG,EH)
但在求CH桿(即黃色標記)的力的時候
我是把它標示為拉力
(用中文很明確的寫出「拉」這個字)
但被助教改錯,助教表示應為「壓」
(我整份答案的拉壓全部標示相反)
但我在讀中文書的時候
無論題目是求內力還是軸力
同樣用節點法算出來且為此方向的力都是標示拉(桿件為受拉桿)
以下是我的疑問:
1.是因為題目是問reaction force,才要寫壓力的嗎?
2.當題目是求「內力、軸力、桿力」這幾個不同的詞彙是不是也會造成表示拉壓時會有不同呢?
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