Experimentai on the service behavior of targe-span steel -concrete box beams

摘要

Bending properties of steel-concrete box beams with three different design parameters are tested under the function of monotonic load to better understand the influences of degree of shear connection and height-thickness ratio of web on nonlinear property, bearing capacity and failure modes thereof. In addition, study on failure modes, slip between the concrete desk and the steel box beam, overall service behavior of the cross section, bending bearing capacity of the normal section, shear lag, etc. is conducted on composite box beams, through which, the failure modes and degree of shear connection of composite box beams are proved to be related to the height-thickness ratio of the web. Finally, slip distribution and relation between slip-strain curves and strain curves of vertical distribution of composite box beams are made clear.