95年高考結構學第二題的內力函數原點選取 - 土木
By Damian
at 2011-01-07T16:12
at 2011-01-07T16:12
Table of Contents
各位板友好:
晚輩在演算95年高考結構學第二題求解應變能的問題裡,有關內力函數
原點的選取有點問題,還望解惑^^
http://wwwc.moex.gov.tw/examnew1/95/12/338200.pdf
(原題目)
問題:
我看久華和實力的解答有關彎矩函數在訂定時ab桿件都是以b點為原點
如此得到的彎矩函數M(x)皆是M(x)=75x-96(0<x<4)
但原點應該是可以任意選取,因此我在ab桿件部份以a點為原點,得到的
彎矩函數卻是M(x)=204-75x(0<x<4),以此進行應變能計算勢必和兩班的解答不同...
請問我是哪裡出了錯誤呢?....
註:我算出固定端的軸力是-123KN,剪力是75KN,彎矩是204KN-M
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土木
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