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Autoren:
Verlag:
Fraunhofer IRB Verlag Weitere Titel dieses Verlages anzeigen
Inhalt | ||
Bezeichnungen | VIII | |
1. | Einleitung | 1 |
1.1. | Motivation und Ziel | 1 |
1.2. | Gliederung | 1 |
1.3. | Stand der Normung | 2 |
2. | Stand der Forschung | 4 |
2.1. | Übersicht | 4 |
2.2. | Berechnung nach „alter Norm" DIN 1052-1:1988 | 5 |
2.3. | Vereinfachte Berechnung von Schnittgrößen im Stahlbetonbau | 5 |
2.4. | Einflussfelder orthotroper Platten | 7 |
2.5. | Berechnung von Deckplatten aus Lamellen nach EC 5-2 | 7 |
2.6. | Untersuchungen zum Tragverhalten von OSB unter Einzellasten | 8 |
3. | Eigenschaften und Beschreibung von OSB | 10 |
3.1. | Definition und Herstellung von OSB | 10 |
3.2. | Unterteilung von OSB | 10 |
3.3. | Eigenschaften von OSB und deren Bestimmung | 11 |
3.3.1. | Allgemeines | 11 |
3.3.2. | Biegung | 12 |
3.3.3. | Zug/Druck | 14 |
3.3.4. | Querkontraktion | 15 |
3.3.5. | Plattenschub und Durchstanzen | 15 |
3.3.6. | Scheibenschub | 17 |
3.3.7. | Rohdichte | 18 |
3.4. | Beschreibung orthotroper Materialien | 21 |
3.4.1. | Allgemeines | 21 |
3.4.2. | Orthotrope Platten | 23 |
3.4.3. | Orthotrope Scheiben | 24 |
3.5. | Flächen aus zusammengeklebten Schichten nach EC 5-1 | 25 |
4. | Experimentelle Untersuchungen | 26 |
4.1. | Motivation | 26 |
4.2. | Versuchstechnik | 26 |
4.3. | Definition der Bruchlast | 28 |
4.4. | Geprüftes Material | 29 |
4.5. | Vorversuche zur Ermittlung der Materialeigenschaften der Platten | 29 |
4.5.1. | Ermittlung der Eigenschaften bei Scheibenbeanspruchung (Versuche V2) | 29 |
4.5.2. | Ermittlung der Eigenschaften bei Plattenbeanspruchung (V3+V4) | 30 |
4.5.3. | Ermittlung des Elastizitätsmoduls senkrecht zur Plattenebene | 33 |
4.5.4. | Bohrwiderstandsmessungen | 34 |
4.6. | Versuche im Übergang von der Balken- zur Plattenbeanspruchung | 35 |
4.7. | Versuche an Platten unter Einzellasten | 36 |
5. | Numerische Untersuchungen | 42 |
5.1. | Motivation | 42 |
5.2. | 2D-Berechnungen mit RFEM | 42 |
5.2.1. | Verwendete Plattenelemente | 42 |
5.2.2. | Diskretisierung | 44 |
5.2.3. | Steifigkeiten | 44 |
5.2.4. | Lasteinleitung und Lagerung | 45 |
5.2.5. | Durchgeführte Berechnungen | 46 |
5.3. | 3D-Berechnungen mit AN SYS | 47 |
5.3.1. | Allgemeines | 47 |
5.3.2. | Diskretisierung | 47 |
5.3.3. | Verwendete Elemente | 48 |
5.3.4. | Plastisches Materialgesetz | 48 |
5.3.5. | Ansatz der Materialeigenschaften | 49 |
5.3.6. | Lagerung und Lasteinleitung | 54 |
5.3.7. | Durchgeführte Berechnungen | 54 |
5.4. | Verifizierung der Rechenmodelle | 55 |
5.4.1. | Überprüfung der Elementierung | 55 |
5.4.2. | Überprüfung der Steifigkeiten | 55 |
5.4.3. | Überprüfung des nichtlinearen Materialmodells | 58 |
5.4.4. | Grenzen der Anwendbarkeit des nichtlinearen Materialmodells für OSB | 65 |
6. | Zur vereinfachten Berechnung der Schnittgrößen und Verformungen | 68 |
6.1. | Allgemeines | 68 |
6.2. | Transformation der Platten | 68 |
6.3. | Berechnung der Biegemomente | 70 |
6.3.1. | Biegemomente in Spannrichtung bei Belastung in Plattenmitte | 70 |
6.3.2. | Biegemomente senkrecht zur Spannrichtung | 72 |
6.3.3. | Biegemomente bei Belastung am freien Rand | 74 |
6.4. | Berechnung der Querkräfte | 75 |
6.4.1. | Querkräfte bei Belastung in Plattcnmitte | 75 |
6.4.2. | Querkräfte bei Belastung am freien Rand | 81 |
6.5. | Berechnung der Verformungen | 85 |
6.5.1. | Verformungen bei Belastung in Plattenmitte | 85 |
6.5.2. | Verformungen bei Belastung am freien Rand | 85 |
6.6. | Einfluss einer Durchlaufwirkung | 87 |
7. | Zum Tragverhalten der OSB unter Einzellasten | 89 |
7.1. | Tragverhalten bei Beanspruchung durch Biegung | 89 |
7.1.1. | Allgemeines | 89 |
7.1.2. | Beschreibung des Biegelängeneffekts | 89 |
7.1.3. | Beschreibung des Umlagerungseffekts | 98 |
7.1.4. | Lasteinleitung | 102 |
7.1.5. | Lastausbreitung | 104 |
7.1.6. | Biegung senkrecht zur Spannrichtung | 105 |
7.2. | Tragverhalten bei Beanspruchung durch Schub | 106 |
7.2.1. | Auflagernahe Belastung in Plattenmitte | 106 |
7.2.2. | Auflagernahe Belastung am freien Rand | 111 |
7.3. | Kombinierte Beanspruchung durch Schub und Biegung | 113 |
7.4. | Platten mit Nut- und Federverbindung | 117 |
8. | Bemessungsvorschlag | 120 |
8.1. | Allgemeines | 120 |
8.1.1. | Geltungsbereich | 120 |
8.1.2. | Der Lastfall Eigengewicht | 120 |
8.2. | Platten ohne schwebende Stöße im Grenzzustand der Tragfähigkeit | 121 |
8.2.1. | Biegung | 121 |
8.2.2. | Schub (Durchstanzen) | 122 |
8.3. | Platten mit schwebenden Stößen im Grenzzustand der Tragfähigkeit | 123 |
8.3.1. | Biegung | 123 |
8.3.2. | Schub | 124 |
8.4. | Grenzzustand der Gebrauchstauglichkeit | 124 |
8.4.1. | Durchbiegungen | 124 |
8.4.2. | Elastizitätsgrenze | 124 |
8.5. | Platten mit Nut- und Federverbindung | 125 |
8.6. | Durchlaufträger | 125 |
9. | Zusammenfassung und Diskussion der Ergebnisse | 126 |
Literatur | 130 | |
Anhang | 134 | |
A. Bemessung von OSB/2/3/4 im Grenzzustand der Tragfähigkeit | 134 | |
A. 1. Zusammenfassung und Vereinfachung der Bemessungsgleichungen | 134 | |
A.2. Beispiel 1: Bemessung einer OSB/3 ohne schwebende Stöße | 135 | |
A.3. Beispiel 2: Bemessung einer OSB/4 ohne schwebende Stöße | 136 | |
A.4. Beispiel 3: Bemessung einer OSB/4 mit schwebenden Stößen | 137 | |
B. Dokumentation der Versuche (auf CD) | ||
B. 1. Beschreibung der Versuchsaufbauten | ||
B.2. Tabellarische Zusammenfassung der Versuchsprotokolle | ||
B.3. Versuchsdaten | ||
B.4. Zuschnittpläne | ||
C. Dokumentation der Berechnungen (auf CD) | ||
C.l. RFEM- Datei | ||
C.2. Kommentierter ztVSTS-APDL-Eingabecode | ||