Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bracing of steel bridges during construction; theory, full-scale tests and simulations
A number of steel bridges have suffered lateral-torsional failure during their construction due to their lacking adequate lateral and/or rotational stiffness. In most cases, slight bracing can be of great benefit to the main girders involved through their controlling out-of-plane deformations and enabling the resistance that is needed to be achieved. The present research concerned the performance of different bracing systems, both those of commonly used types and pragmatic alternatives. The methods that were employed include the derivation of analytical solutions, full-scale laboratory testing, and numerical modeling. The results of a part of the study showed that the load-carrying capacity of The Marcy Bridge that collapsed in 2002 could be improved by adding top flange plan bracing at 10-20% of its span near the supports. Theoretically, according to Eurocode 3, providing each bar of an X-type plan bracing having cross-sectional area as small as 8 mm^2 serves to enhance the load-carrying capacity of the bridge by a factor of 1.28, which is sufficient to prevent failure of the bridge during the casting of the deck. The research also included the derivation of a simplified analytical approach for determining the critical moment of the laterally braced steel girders at the level of their compression flange, which otherwise can usually not be predicted without the use of finite element program. The model employed related the buckling length of the compression flange of steel girders in question to their critical moment. An exact solution and a simplified expression were also derived for dealing with the effect of the rotational restraint of the shorter segments on the buckling length of the longer segments in beams having unequally spaced lateral bracings. The effects of this sort are often neglected in practice and the buckling length of compression members in such systems is commonly assumed to be equal to the largest distance between the bracing points. However, the present study showed that this assumption can ...
Bracing of steel bridges during construction; theory, full-scale tests and simulations
A number of steel bridges have suffered lateral-torsional failure during their construction due to their lacking adequate lateral and/or rotational stiffness. In most cases, slight bracing can be of great benefit to the main girders involved through their controlling out-of-plane deformations and enabling the resistance that is needed to be achieved. The present research concerned the performance of different bracing systems, both those of commonly used types and pragmatic alternatives. The methods that were employed include the derivation of analytical solutions, full-scale laboratory testing, and numerical modeling. The results of a part of the study showed that the load-carrying capacity of The Marcy Bridge that collapsed in 2002 could be improved by adding top flange plan bracing at 10-20% of its span near the supports. Theoretically, according to Eurocode 3, providing each bar of an X-type plan bracing having cross-sectional area as small as 8 mm^2 serves to enhance the load-carrying capacity of the bridge by a factor of 1.28, which is sufficient to prevent failure of the bridge during the casting of the deck. The research also included the derivation of a simplified analytical approach for determining the critical moment of the laterally braced steel girders at the level of their compression flange, which otherwise can usually not be predicted without the use of finite element program. The model employed related the buckling length of the compression flange of steel girders in question to their critical moment. An exact solution and a simplified expression were also derived for dealing with the effect of the rotational restraint of the shorter segments on the buckling length of the longer segments in beams having unequally spaced lateral bracings. The effects of this sort are often neglected in practice and the buckling length of compression members in such systems is commonly assumed to be equal to the largest distance between the bracing points. However, the present study showed that this assumption can ...
Bracing of steel bridges during construction; theory, full-scale tests and simulations
Mehri, Hassan (Autor:in)
01.01.2015
Hochschulschrift
Elektronische Ressource
Englisch
Civil Engineering , Bracing , steel-concrete composite , steel , bridge , test , construction , laboratory , experiment , experimental , theory
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