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Biegung durch Krafteinwirkung von innen

Fragen & Antworten zur Technischen Mechanik & Festigkeitslehre.

Biegung durch Krafteinwirkung von innen

Beitragvon saman1357 am Fr 22. Jan 2010, 11:56

Hi,
weiß jemand wie ich die Durchbiegung eines geschlossenen Trägers berechnen kann? Es handelt sich um ein geschlossenen Trog, das Problem ist aber dass die Last nicht von oben auf den Querschnitt wirkt sondern von innen (auf die Innenseite des Querschnitts). Eine Zeichnung ist beigefügt.

Vielen Dank im Vorraus
Saman1357

Durchbiegung.JPG
Durchbiegung.JPG (18.37 KiB) 1006-mal betrachtet
saman1357
 
Beiträge: 4
Registriert: Fr 22. Jan 2010, 11:50

Re: Biegung durch Krafteinwirkung von innen

Beitragvon rask am Mo 25. Jan 2010, 20:37

Hi,
also ich kann jetzt auch falsch liegen, aber man kann doch Kräfte bzw. Kraftvektoren entlang ihrer wirkungslinie verschieben. D.h., dass es eigentlich egals ist, ob die querkraft oben oder unten wirkt.
Diese Regel stammt jedenfalls aus der Statik, also vielleicht kann man sie in deinem Fall nicht anwenden :?
rask
 
Beiträge: 12
Registriert: Mi 11. Mär 2009, 21:33

Re: Biegung durch Krafteinwirkung von innen

Beitragvon Nimrod am Fr 29. Jan 2010, 11:27

Hi,
also ich kann jetzt auch falsch liegen, aber man kann doch Kräfte bzw. Kraftvektoren entlang ihrer wirkungslinie verschieben. D.h., dass es eigentlich egals ist, ob die querkraft oben oder unten wirkt.
Diese Regel stammt jedenfalls aus der Statik, also vielleicht kann man sie in deinem Fall nicht anwenden


Ja, du liegst falsch!
Die Verschiebung einer Kraft auf einer Wirklinie setzt einen starren Körper voraus.
Da er hier die Durchbiegung berechnen will ändert sich bei Kraftverschiebung :
1.)Die Biegesteifigkeit E*I, da sich das Flächenträgheitsmoment bei Kraftverschiebung ändern kann.
2.)Er hat keinen starren sondern einen elastisch verformbaren Körper.
----> Keine Verschiebung der Kraft

Lösung: Die Biegesteifigkeit (und hierfür das Flächenträgheitsmoment)des mit der Kraft(und daraus das resultierende Biegemoment)
belasteten Körpers muss berechnet werden
Nimrod
 
Beiträge: 36
Registriert: Di 1. Dez 2009, 17:38

Re: Biegung durch Krafteinwirkung von innen

Beitragvon Cock146 am Fr 6. Feb 2015, 08:53

Eine Zeichnung ist beigefügt...??


________________________________________________

http://www.spanishprograms.com/learn-spanish/
http://www.bbc.co.uk/education/subjects/zr9d7ty
Cock146
 
Beiträge: 1
Registriert: Fr 6. Feb 2015, 08:50


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