Progressive　collapse　is　defined　as　the　localized　damage　propagating　throughout　a　structural　system,　which　is　triggered　by　the　initial　failure　of　critical　structural　element(s)　caused　by　abnormal　loads,　eventually　resulting　in　a　partial　or　total　collapse　of　the　entire　structural　system.　The　progressive　collapse　resistance　of　the　structural　system　is　significantly　affected　by　its　redundant　strength.　The　influences　of　primary　design　parameters　on　the　progressive　collapse　resistance　of　regular　reinforced　concrete　(RC)　frame　structures　were　analyzed　and　summarized　to　satisfy　the　requirement　of　rapid　engineering　assessment.　Eighteen　typical　RC　frames　with　regular　configurations　were　designed　according　to　the　codes　in　which　the　effects　of　three　design　parameters,　i.e.,　seismic　fortification　intensity,　total　number　of　structural　floors　and　structural　span,　on　structural　redundant　strength　were　considered.　The　numerical　models　of　the　frames　were　established　using　fiber　beam　elements,　in　which　beams　were　modeled　with　T-shaped　sections　considering　the　contribution　of　the　floor　slab　within　the　effective　flange　width.　The　nonlinear　dynamic　alternate　path　method　was　utilized　to　analyze　the　progressive　collapse　responses　of　these　frames　when　initial　failure　occurred　at　different　locations,　and　the　influences　of　the　primary　design　parameters　on　the　progressive　collapse　resistance　of　the　structures　were　studied.　©　2023　Tsinghua　University.　All　rights　reserved.