In erection phase, when the static scheme is in progress and the connection between the concrete slab and the upper flange of steel beams is not yet effective, lateral-torsional buckling in steel-concrete composite bridges is restrained by provisional horizontal steel bracing systems. Nevertheless, in simply supported composite bridges spanning up to 30 m, provisional bracing system and intermediate transverse beams result unnecessary in the final configuration, when the concrete slab turns effective. As demonstrated by experimental results obtained on real scale specimens, friction forces which develop between the concrete predalles and the upper flanges of the steel beams during the fresh concrete casting could be sufficient to assure the necessary temporary restraint against LTB, so that provisional steel bracing system as well as intermediate transverse beams could be eliminated simplifying the construction and reducing significantly building time and cost of the bridge
Influence of steel-concrete friction in lateral torsional stability of composite bridges during the erection phase
CARAMELLI, STEFANO;CROCE, PIETRO
2004-01-01
Abstract
In erection phase, when the static scheme is in progress and the connection between the concrete slab and the upper flange of steel beams is not yet effective, lateral-torsional buckling in steel-concrete composite bridges is restrained by provisional horizontal steel bracing systems. Nevertheless, in simply supported composite bridges spanning up to 30 m, provisional bracing system and intermediate transverse beams result unnecessary in the final configuration, when the concrete slab turns effective. As demonstrated by experimental results obtained on real scale specimens, friction forces which develop between the concrete predalles and the upper flanges of the steel beams during the fresh concrete casting could be sufficient to assure the necessary temporary restraint against LTB, so that provisional steel bracing system as well as intermediate transverse beams could be eliminated simplifying the construction and reducing significantly building time and cost of the bridgeI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.