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Nichtlineare Berechnungen Von Plattenfundamenten - Nonlinear Analysis of Mat Foundations

Nichtlineare Berechnungen Von Plattenfundamenten - Nonlinear Analysis of Mat Foundations

          
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About the Book

In dieser Arbeit werden die Einflusse auf die Boden-Bauwerks-Interaktion von Plattenfundamenten auf granularen Boden untersucht. Die Losung dieses Anfangsrandwertproblems erfolgt im Rahmen der Finite-Elemente-Methode mit dem Programmsystem Abaqus. Das Tragverhalten von Flachgrundungen beruht auf den nichtlinearen Stoffeigenschaften des Bodens und des ublicherweise verwendeten Betons. Dieser Nichtlinearitat wird jedoch bei den in der Ingenieurpraxis zur Anwendung kommenden Standardverfahren, dem Bettungsmodul- und dem Steifemodulverfahren, nicht Rechnung getragen. Aus diesem Grund wird, ausgehend von diesen beiden Methoden, der Grad der Nichtlinearitat sukzessive gesteigert, bis am Schluss das Spannungs-Dehnungs-Verhalten sowohl des Bodens als auch des Betons moglichst realitatsnah beschrieben wird.Die mechanische Beschreibung des elastischen Bodenverhaltens erfolgt beim Bettungsmodulverfahren uber ein eindimensionales Federmodell. Das Steifemodulverfahren entspricht einer Abbildung des Problems in den elastisch-isotropen Halbraum, der in den Berechnungen mit Hilfe des elastischen Hooke'schen Stoffgesetzes modelliert wird. Das nichtlineare, anelastische Bodenverhalten wird einerseits uber ein linear-elastisches, ideal-plastisches Stoffgesetz mit Mohr-Coulomb'scher Fliessflache und andererseits uber zwei hypoplastische Stoffgleichungen beschrieben.Die konstitutiven Gleichungen fur das Mohr-Coulomb-Stoffgesetz werden im Rahmen der Plastizitatstheorie abgeleitet, programmiert und uber eine Benutzerschnittstelle in das Programmsystem Abaqus implementiert. Das Konzept der Hypoplastizitat wird kurz vorgestellt. Es werden die Ratengleichungen von Wu und v.Wolffersdorff vorgestellt und implementiert. Besonderes Augenmerk wird bei der Modellierung des Bodens auch auf die Bestimmung der Materialparameter und die Kalibrierung der Stoffgesetze gelegt. Die Bodenstoffgesetze werden uber die Nachrechnung von Versuchen verifiziert. Es werden ein Odometerversuch und ein Triaxialversuch und im Anschluss daran ein elastischer, auf Sand gebetteter Balken analysiert.Die Darstellung des Betonstoffgesetzes erfolgt fur den ebenen Spannungszustand, da die Fundamentplatte uber geschichtete Schalenelemente diskretisiert wird. Die Fliessfunktion wird in der Hauptspannungsebene durch die Festlegung von drei Punkten bestimmt, die Aktualisierung der Spannungen erfolgt uber ein Projektionsverfahren (implizites Euler-Verfahren). Unter Zugbeanspruchung wird die Steifigkeit des Stahlbetonquerschnitts aus den Komponenten des unbewehrten Betons ( tension softening), des Betonstahls und des Mitwirkens des Betons zwischen den Rissen ( tension stiffening) zusammengesetzt. Die Entfestigung des Betons wird uber das Konzept der Koppelung der Bruchenergie mit der charakteristischen Elementslange objektiviert. Die Leistungsfahigkeit des Betonstoffgesetzes wird anhand der Berechnung eines geschlitzten Balkens, einer einachsig und einer zweiachsig gespannten Platte uberpruft.


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Product Details
  • ISBN-13: 9783832500313
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 169 mm
  • ISBN-10: 3832500316
  • Publisher Date: 15 Sep 2002
  • Height: 240 mm
  • No of Pages: 164
  • Series Title: Advances in Geotechnical Engineering and Tunneling
  • Weight: 700 gr


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