For　through　tied-arch　bridges,　the　corrosion　and　degradation　of　the　cable＇s　load-bearing　capacity　are　the　main　external　causes　of　cable　breakage　and　subsequent　structural　failure;　nevertheless,　the　progressive　collapse　after　cable　breakage　is　primarily　attributed　to　the　weak　structural　robustness,　which　makes　a　huge　potential　risk　of　bridge　operation　and　maintenance　(O　&　M).　Whereas,　as　the　basis　of　O　&　M,　current　condition　evaluation　method　has　not　yet　taken　into　consideration　the　influence　of　different　consequences　of　cable　breakage,　resulting　in　unscientific　conclusions　for　O　&　M　decisions　frequently.　In　this　study,　a　robustness-based　condition　evaluation　framework　for　the　overall　structure　of　the　through　tied-arch　bridge　is　presented,　consisting　of　three　stages:　(1)　structural　robustness　assessment　associated　with　tie-bar　and　suspender　failure　respectively;　(2)　classification　of　evaluation　process　by　the　results　of　robustness　assessment,　within　which　the　overall　structure　is　either　evaluated　using　the　code　method　or　evaluated　directly　as　unqualified　(Condition　I　and　II),　or　the　structural　member　weightings　are　adjusted　according　to　the　robustness　weightings　(Condition　III);　and　(3)　condition　evaluation　of　entire　bridge.　The　evaluation　processes　of　three　conditions　are　further　presented　in　accordance　with　the　tied-arch　structure　and　suspended　deck　system.　To　establish　the　robustness　weightings　in　Condition　III,　the　safety　redundancy　indexes　of　through　tied-arch　structures　as　well　as　the　suspended　deck　system　are　calculated　separately,　combined　with　robustness　assessment　result.　Applying　the　proposed　framework　to　evaluating　the　condition　of　a　through　tied-arch　bridge　with　different　structures,　the　analysis　and　comparison　indicates　that,　due　to　the　robustness　of　the　through　tied-arch　structure　and　suspended　deck　system,　the　variation　in　the　potential　risk　of　accidents　induced　by　cable　failure　is　shown　intuitively　through　the　evaluation　results,　which　better　meets　the　needs　of　guiding　bridge　O　&　M　decisions　consequently.