Arc　additive　manufacturing　(AM)　technology　offers　high　deposition　efficiency,　making　it　well-suited　for　the　fabrication　of　large　and　complex　structural　components.　However,　the　repeated　thermal　cycling　can　lead　to　stress　accumulation,　with　excessive　residual　stress　potentially　causing　cracking　and　structural　failure.　The　improved　inherent　strain　method　has　demonstrated　effectiveness　in　rapidly　predicting　stress　in　arc　AM　structures.　Nevertheless,　the　existing　inherent　strain　application　schemes　lack　consideration　for　complex　structures　with　thermal　and　mechanical　mutations.　To　address　this　limitation,　this　study　establishes　a　finite　element　model　for　a　30　degrees　corner　additive　structure　based　on　the　thermo-elastoplastic　(TEP)　method　and　conducts　experimental　verification　on　the　large-scale　corner　structure.　By　analyzing　the　influence　of　reheating　effects　in　the　corner　region,　multiple　inherent　strain　application　schemes　were　designed　and　evaluated.　The　scheme　that　applies　the　average　inherent　strain　of　the　different　trajectories　showed　good　agreement　with　the　TEP　method　in　predicting　X-direction　stress.　Compared　with　the　TEP　method,　the　average　prediction　error　of　X-stress　in　the　linear　center　regions　and　corner　regions　of　Path1　using　the　average　inherent　strain　scheme　is　approximately　25　MPa　and　46　MPa,　significantly　lower　than　the　errors　of　110　MPa　and　130　MPa　in　the　conventional　inherent　strain　scheme.　For　Path2,　the　average　corresponding　prediction　errors　were　about　53　MPa　and　49　MPa.　And　the　time　cost　of　stress　prediction　using　the　inherent　strain　method　is　only　0.3%　of　that　required　by　the　TEP　method.　In　the　large　30　degrees　corner　structure　with　a　side　length　of　0.3　m,　the　errors　of　the　stress　at　the　midpoint　and　inflection　point　of　the　first　trajectory　relative　to　the　experimental　measurement　are　approximately　40　MPa　and　65　MPa,　respectively.