To　investigate　the　dynamic　impact　of　systemic　hanger　failure　on　the　multi-span　through　tied-arch　bridge,　firstly,　three　numerical　calculation　methods　were　employed　to　simulate　the　effects　of　hanger　breakage:　the　LS-DYNA　restart　method,　the　element　birth　and　death　method,　and　the　full-dynamic　analysis　method.　The　simulated　effects　were　then　compared　with　dynamic　response　data　of　the　hanger　breakage　test　to　identify　the　optimal　method　for　modeling　systemic　hanger　failure.　Secondly,　to　enhance　the　robustness　and　prevent　progressive　collapse　in　multi-span　through　tied-arch　bridge　structures,　two　structural　systems　were　proposed:　the　simply-supported　continuous　structure　and　the　rigid　integral　tied-arch　structure.　The　failure　simulation　method　was　employed　to　compare　the　dynamic　response　of　the　remaining　structure　under　systemic　hanger　failure　before　and　after　structural　transformation.　Additionally,　the　Simple-Johnson-Cook　model　was　utilized　to　simulate　the　damage　process　of　the　bridge　and　determine　the　final　damage　mode　of　the　structure.　On　this　basis,　the　progressive　collapse　and　damage　mechanism　of　the　structure　under　systemic　hanger　failure　was　further　investigated.　Research　results　show　that　the　error　between　the　simulation　results　and　the　test　data　of　the　LS-DYNA　restart　method　is　relatively　small,　enabling　better　simulation　of　conditions　when　the　hanger　experiences　instantaneous　damage.　For　the　simply-supported　continuous　structure,　in　the　event　of　systemic　hanger　failure,　the　final　damage　extent　of　the　bridge　system　is　the　lowest,　and　the　force　transmission　path　is　extended,　effectively　delaying　the　damage　process　of　the　structure,　reducing　the　risk　of　progressive　collapse　accidents,　and　providing　additional　time　for　traffic　evacuation.　However,　for　the　rigid　integral　tied-arch　structure,　due　to　the　high　initial　stiffness,　stress　concentration　may　occur,　leading　to　premature　local　failure　of　the　bridge　system.　Consequently,　the　simply-supported　continuous　structure　can　be　utilized　in　the　design　of　newly　constructed　multi-span　through　tied-arch　bridges　or　readily　applied　to　enhance　the　robustness　of　existing　bridges　through　the　installation　of　replaceable　joints　on　pier　tops.　©　2025　Chang＇an　University.　All　rights　reserved.