To　conduct　the　aseismic　analysis　of　concrete-filled　steel　tube　(CFST)　arch　bridges,　the　initial　finite　element　model　of　a　practical　and　operational　CFST　arch　bridge　is　derived.　Meanwhile,　a　more　accurate　and　up-to-state　dynamic　analysis　model　for　aseismic　analysis　can　be　derived　through　the　modal　identification　and　calibration　techniques.　Thus,　this　paper　is　to　bridge　the　gap　between　the　health　monitoring　techniques　and　aseismic　analysis　for　large-span　bridge　structures.　With　the　employment　of　the　ambient　response　histories　from　a　health　monitoring　system　of　this　bridge,　the　operational　modal　parameters　are　identified　by　the　FDD　method,　the　FE　model　has　been　calibrated　using　a　zero-order　approximation　method　then.　Results　show　that　the　FDD　method　can　well　identify　the　modal　parameters　and　satisfactory　results　are　observed　in　using　the　zero-order　approximation　method　for　the　model　calibration.　The　error　between　calculated　and　measured　frequencies　can　be　reduced　to　0.11%~3.76%,　and　the　variations　of　material　properties　(8.77%~10.21%)　have　significant　effects　on　the　structural　dynamic　behavior.　The　calibrated　model,　reflecting　the　practical　state　of　a　structure,　can　be　used　to　assess　the　aseismic　behaviors　of　operational　bridge　structures　in　the　further.