關於靜不定桁架的位移 - 土木

By Sandy
at 2011-05-05T23:57
at 2011-05-05T23:57
Table of Contents
回頭看了上次的發問發現,文筆太差問的沒什麼人回應的樣子。
找了其他課本也沒有清楚的解釋這個問題,這次想說把問題簡化在請教一下各位先進。
關於桁架求某節點的變位分析,幾乎都是使用單位力法。
1.算出各桿件的"真實內力" 在此稱作 "S"
2.對該節點施加單位力取得 各桿件的虛內力 在此稱作 "u"
3. 帶入 位移= (SuL)/(AE) 得到位移~
以此類推在"靜不定"行架求變位時,必須使用"相合變形(諧和變位)"或是 最小功法
分別求得真實內力 S 以及 虛內力 u 再代入單位力法~
但是幾乎所有結構的書籍在解靜不定桁架變位分析的時候,
u <= 都是使用"基元結構"的結果帶入單位力法
並不是真正去解 單位虛力 在靜不定桁架中各桿的內力~(速度會快很多)
小弟的疑問就是~ WHY?
相關類題在 96土木高考有出現
以上@@ 如果有看不懂請見諒 ~~orz
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All Comments

By Poppy
at 2011-05-07T13:26
at 2011-05-07T13:26

By Isla
at 2011-05-10T00:24
at 2011-05-10T00:24

By Callum
at 2011-05-11T06:18
at 2011-05-11T06:18

By John
at 2011-05-11T10:18
at 2011-05-11T10:18

By Tracy
at 2011-05-15T23:59
at 2011-05-15T23:59

By Dinah
at 2011-05-17T02:44
at 2011-05-17T02:44

By Iris
at 2011-05-20T23:08
at 2011-05-20T23:08

By Skylar Davis
at 2011-05-23T01:46
at 2011-05-23T01:46

By Agnes
at 2011-05-23T05:16
at 2011-05-23T05:16
可是在各大書籍的u 都是使用"基元結構"的 u
這是我的疑問 @@

By Sierra Rose
at 2011-05-23T17:29
at 2011-05-23T17:29
這樣有解除你的疑問媽?

By Ursula
at 2011-05-25T14:53
at 2011-05-25T14:53

By Damian
at 2011-05-26T16:30
at 2011-05-26T16:30

By Caitlin
at 2011-05-31T07:28
at 2011-05-31T07:28
你把兩種你算的方式 掃一掃PO上來不就好了?

By Tristan Cohan
at 2011-06-03T09:38
at 2011-06-03T09:38

By Steve
at 2011-06-05T12:13
at 2011-06-05T12:13
再次感謝~~

By Olive
at 2011-06-09T16:32
at 2011-06-09T16:32

By Ina
at 2011-06-12T07:46
at 2011-06-12T07:46

By Bennie
at 2011-06-12T14:20
at 2011-06-12T14:20

By Regina
at 2011-06-12T16:38
at 2011-06-12T16:38

By Frederica
at 2011-06-14T05:36
at 2011-06-14T05:36

By Frederica
at 2011-06-14T10:12
at 2011-06-14T10:12

By Genevieve
at 2011-06-19T08:57
at 2011-06-19T08:57
您都已經把答案說出來了,就是速度快很多嘛 = =+
就像要求梁某個點的撓度一樣,沒必要算變形曲線函數算半天

By Selena
at 2011-06-23T22:37
at 2011-06-23T22:37

By Joseph
at 2011-06-27T16:14
at 2011-06-27T16:14

By Iris
at 2011-06-30T07:40
at 2011-06-30T07:40

By Rebecca
at 2011-07-02T19:54
at 2011-07-02T19:54
所以可以簡化成用基元結構算.
至於是不是湊巧.或是有證明..這我就不清楚了

By Emma
at 2011-07-03T19:41
at 2011-07-03T19:41

By Lily
at 2011-07-04T05:27
at 2011-07-04T05:27

By Zanna
at 2011-07-07T13:54
at 2011-07-07T13:54
http://bbs.civilgroup.org/viewtopic.php?t=1538

By Anthony
at 2011-07-08T01:23
at 2011-07-08T01:23

By Skylar DavisLinda
at 2011-07-11T13:09
at 2011-07-11T13:09

By Rosalind
at 2011-07-14T19:06
at 2011-07-14T19:06
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