The　traditional　damping　models　generally　include　such　models　as　the　viscous　damping,　the　coulomb　damping,　the　complex　damping　and　the　stress　damping.　These　models　cannot　sufficiently　reveal　the　rule　and　phenomenon　how　the　damp　varies　with　the　damage　evolution.　It　is　assumed　that　the　damping　energy　dissipation　of　the　reinforced　concrete　structures　mainly　consists　of　the　viscous　damping　and　the　residual　stress　damping,　and　the　residual　stress　damping　includes　the　bond　stress　between　the　reinforcement　and　the　concrete　and　the　friction　stress　of　the　concrete　cracks.　On　the　basis　of　this　assumption,　a　combined　damping　model　based　on　the　residual　stress　is　proposed.　The　dynamic　equation　of　the　structure　containing　viscous　and　coulomb　damping　is　established,　and　the　formula　of　the　damping　ratio　with　the　development　of　damage　is　derived.　The　damping　change　regulation　of　the　reinforced　concrete　structures　under　different　damage　states　is　analyzed.　It　is　found　that　the　damping　ratio　of　different　damage　degree　is　remarkably　affected　by　the　ratio　of　the　residual　stress　and　the　stiffness,　and　diverseparameters　of　the　combined　damping　model　are　available　and　has　better　adaptability.　Finally,　the　change　of　damping　with　the　damage　of　reinforced　concrete　simply-supported　beam　is　tested　by　the　static　damage　experiment,　and　the　mechanism　of　the　change　of　the　damping　ratio　with　different　damage　is　analyzed　combined　with　numerical　simulation.　The　results　show　that　the　combined　damping　model　has　a　definite　mechanical　mechanism,　and　the　phenomenon　that　the　damping　ratio　of　the　reinforced　concrete　beam　originally　increases　and　subsequently　decreases　with　the　damage　degree　is　accurately　revealed.　©　2017,　Nanjing　Univ.　of　Aeronautics　an　Astronautics.　All　right　reserved.