Based　on　a　rigid-frame　tied　through　CFST　arch　bridge,　the　finite　element　model　was　built　with　the　ANSYS/LS-DYNA　software.　The　process　of　cable　loss　was　simulated　with　the　contact-impact　method　to　analyze　the　variation　of　the　internal　forces　of　different　structure　members　before　and　after　cable　loss.　The　results　show　that　cables,　arch　ribs　and　deck　slabs　are　all　influenced　by　the　impact　produced　by　the　process　of　cable　loss.　Among　them,　the　influence　of　cable　loss　on　the　adjacent　cables　is　the　largest　and　the　variation　of　axial　force　can　exceed　three　times　of　the　initial　force.　Therefore,　the　effect　of　dynamic　force,　which　is　far　greater　than　the　static　response　during　the　cable　loss,　should　be　considered.　It　is　also　concluded　that　the　influence　of　cable　loss　on　the　main　girder　is　significantly　greater　than　that　on　the　arch　ribs.　The　local　collapse　of　floor　system　can　be　found　due　to　the　insufficient　strength　of　the　weld　connection　between　the　transverse　and　longitudinal　beams.　©　2014　Taylor　&　Francis　Group.