Testing of Large Size Composite Box Girders

摘要

Two "large size" composite box girder specimens were tested. Each was subjected to a series of preliminary loading before testing to failure under combined bending moment and torsion. This report summarizes briefly the results of testing, with emphasis placed on behavior and mode of failure of the composite box girders.nThe slender webs of composite box girders behaved similar to webs of simple plate girders:post-buckling, diagonal, tension fields developed under relatively high shear. When the web buckling strength was high, yielding of steel tension flange or buckling of steel compression flange took place first. The failure of a composite box girder occurred when, at least, both flanges and a web or both webs and a flange have failed.