To　simplify　the　calculation　method　of　the　dynamic　response　of　the　half-through　and　through　arch　bridges　after　the　suspender　fracture,　the　breaking　safety　limit　state　for　the　robust　design　of　suspension　bridge　deck　was　proposed.　The　scale　model　test　was　carried　out,　and　the　finite　element　(FE)　model　of　the　suspension　bridge　deck　structure　without　considering　the　arch　ribs　was　established　by　ANSYS　/　LS-DYNA.　A　simplified　calculation　model　of　elastic　support　continuous　beam　was　proposed,　and　a　simplified　calculation　method　of　suspension　bridge　deck　system　was　derived　by　using　the　ordinary　equation　of　five　bending　moments.　18　standard　arch　bridges　with　different　spans　were　analyzed　to　verify　the　accuracy　of　the　simplified　calculation　method.　The　results　show　that　the　partial　coefficients　of　constant　load　and　live　load　in　the　breaking　safety　limit　state　are　γG　=　1.　2　and　γQ　=　0.　9,　respectively,　and　the　lateral　load　distribution　coefficients　are　1.　0　for　1　lane,　0.　75　for　2　lanes,　and　0.　52　for　3　lanes　and　above,　and　the　rebar　and　steel　strengths　are　taken　as　1.　25　and　1.　05　times　of　yield　strengths,　respectively,　the　other　materials　strength　are　taken　as　standard　values.　The　maximum　positive　error　of　the　FE　simplified　calculation　model　is　11.　7%.　It　is　suggested　that　the　calculated　lengths　of　the　elastic　support　continuous　beam　model　under　the　fracture　condition　of　short　suspender,　sub-short　suspender　and　long　suspender　be　D+2L,　D+3L　and　4L　respectively,　and　the　deviation　rates　be　2.　89%,　2.　40%　and　3.　66%,　respectively.　The　maximum　positive　errors　of　the　simplified　calculation　method　under　the　safety　limit　of　suspender　fracture　are　11.　4%　and　10.　1%,　respectively,　and　the　calculation　results　have　good　accuracy　with　bias　towards　safety.　©　2024　Chinese　Society　of　Civil　Engineering.　All　rights　reserved.