Composite　box　girders　with　corrugated　steel　webs　(CBGCSWs)　offer　the　advantages　of　light　weight　and　non-cracking　webs　and　therefore　tend　to　develop　into　super-span　bridges.　However,　the　torsional　behavior　of　the　composite　box　girders　under　eccentric　loading　is　more　prominent,　due　to　the　smaller　torsional　stiffness.　Studies　on　the　torsional　behavior　of　super-span　CBGCSWs　are　limited.　Therefore,　three　super-span　specimens　of　CBGCSWs　with　different　cross-sectional　forms　were　designed,　and　both　experimental　and　numerical　studies　were　carried　out　in　this　paper.　The　performance　of　finite　element　analysis　(FEA)　models　was　verified　by　comparing　the　experimental　results,　which　included　the　torque-twist　curves,　cracking　modes　of　concrete　slabs,　and　shear　strains　of　concrete　slabs　and　corrugated　steel　webs　(CSWs).　A　parametric　analysis　was　also　conducted,　and　a　method　for　calculating　the　torsional　bearing　capacity　of　composite　box　girders　was　established　based　on　the　three　probable　failure　modes　of　super-span　CBGCSWs.　Results　indicated　that　the　torsional　bearing　capacity　of　the　high-web　and　wide-cell　specimens　was　better　than　that　of　the　standard　specimen.　Global　buckling　of　the　standard　and　wide-cell　specimens　occurred　at　almost　all　wavelengths,　whereas　that　of　the　high-web　specimen　was　concentrated　in　the　middle　of　the　span.　The　failure　modes　of　CBGCSWs　were　influenced　by　the　concrete　strength　and　reinforcement　ratio.　The　calculation　method　can　effectively　predict　the　failure　modes　and　ultimate　torques　of　CBGCSWs.　©　2024　Institution　of　Structural　Engineers