Various　disasters　may　trigger　a　progressive　collapse　of　frame　structures,　resulting　in　a　high　demand　for　new　preventive　structural　strategies.　Among　the　strategies　adopted,　increasing　the　joint　rotation　capacity　to　improve　catenary　action　and　forming　a　second　path　in　the　joint　area　are　the　most　effective.　In　this　study,　a　novel　principle　is　proposed,　in　which　the　web　opening　is　used　to　meet　the　rotation　capacity,　and　kinked　reinforced　bars　are　installed　in　the　beam-column　joint　to　realize　a　second　path.　Experimental　and　numerical　investigations　were　conducted　on　a　frame　substructure　with　kinked　reinforced　bars,　considering　their　diameters,　kinked　heights,　and　lengths.　The　deformation　capacity,　vertical　force　vs.　deformation　response,　failure　mode,　and　contributions　of　the　flexural　and　catenary　actions　on　the　reinforced　bars　were　evaluated.　The　test　results　demonstrate　that　the　kinked　reinforced　bars　in　the　reduced-web-section　connection　(RRWS)　specimens　started　to　work　after　the　plastic　state.　Although　they　had　little　influence　on　the　flexural　action,　they　were　very　important　to　the　catenary　action.　When　the　kinked　height　a　was　less　than　2d,　the　bearing　capacity　and　ductility　of　the　specimen　increased　with　a,　but　further　increasing　the　kinked　height　a　beyond　2d　would　reduce　both　the　bearing　capacity　and　the　ductility.　In　addition,　the　failure　modes　of　the　specimens　were　related　to　whether　the　plastic　hinge　was　formed　first　or　the　reinforced　bar　had　a　major　role　first.　Therefore,　it　is　suggested　to　select　the　kinked　height　of　the　reinforced　bar　according　to　the　deformation　capacity　of　the　beam,　and　the　diameter　of　the　bar　as　half　of　the　kinked　height.