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Author(s):	Johnson, Roger P.
Title:	Control of cracking in composite bridge decks in regions in biaxial tension
Abstract:	Deck slabs of bridges of composite construction can in places be stressed in biaxial tension throughout their thickness. Rules for control of crack width in codes such as EN 1994-2 are based on tests in uniaxial tension. Crack-width measurements are reported from tests in 1977 on slabs in biaxial tension, acting as flanges of composite beams. A theoretical model for prediction of crack width is explained, and a method is given for applying the rules of EN 1994-2 to biaxial tension. It gives results slightly more conservative than characteristic values deduced from the test results. Rissbreitenbeschränkung in Bereichen unter zweiachsialer Zugbeanspruchung für Fahrbahnplatten von VerbundbrüKen. Fahrbahnplatten von Verbundbrücken können teilweise über ihre gesamte Dicke durch zweiachsiale Zugbeanspruchungen belastet werden. Regelungen zur Rissbreitenkontrolle in Normen wie EN 1994-2 beruhen auf Versuchen unter einachsialer Beanspruchung. Zu Versuchen aus dem Jahr 1977 liegen Ergebnisse von Rissbreiten-Messungen an Platten unter zweiachsialer Beanspruchung vor, bei denen die Platten als Gurte von Verbundträgern wirkten. Es wird ein theoretisches Modell zur Vorhersage von Rissbreiten erläutert und eine Methode zur Anwendung der Vorschriften der Norm EN 1994-2 auf zweiachsige Zugbeanspruchung vorgestellt. Die Ergebnisse des Modells sind etwas konservativer als die charakteristischen Werte, die aus den Versuchen ermittelt wurden.
Source:	Stahlbau 80 (2011), No. 12
Page/s:	880-884
Language of Publication:	English

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