Fiber-reinforced　polymer　(FRP)　bar　can　be　served　as　a　promising　alternative　to　steel　rebars　due　to　its　lightweight,　high　corrosion　resistance　and　wider　working　temperatures,　etc.,　especially　for　the　structure　sensitive　to　weight　or　in　aggressive　environments.　In　order　to　lay　the　foundation　for　a　more　scientific　design　of　structures　reinforced　with　FRP　bars,　the　bond　behavior　of　FRP　bars　to　surrounding　concrete　subjected　to　pull-out　loadings　with　different　loading　rates　was　investigated　with　a　refined　numerical　model　in　the　present　study.　In　the　model,　the　surface　features　of　FRP　bars　and　the　heterogeneity　of　concrete　were　explicitly　reflected.　The　interaction　between　the　two　materials　was　modeled　with　a　surface-to-surface　contact　strategy.　The　effectiveness　of　the　model　was　verified　by　the　good　agreement　between　the　simulation　results　and　the　available　experimental　observations.　With　the　help　of　the　numerical　model,　taking　basalt　FRP　(BFRP)　bars　as　an　instance,　the　cracking　process　and　failure　patterns,　bond-slip　curves,　bond　strength　and　peak　slip　at　the　FRP　bar　to　the　concrete　interface　were　simulated　and　analyzed.　The　influences　of　fiber　types　and　surface　characteristics　of　FRP　bars　were　discussed.　Based　on　the　simulation　results,　an　empirical　formula　was　given　to　predict　the　dynamic　bond-slip　relationships　of　FRP　bars　in　concrete.　It　was　indicated　that　the　failure　patterns　of　the　FRP　bar　to　concrete　interface　under　various　strain　rates　do　not　show　much　difference　within　the　scope　of　the　present　study.　The　elastic　modulus　of　FRP　bars　mainly　affects　the　bond　stiffness　and　peak　slip　instead　of　bond　strength.　The　density　of　FRP　bars　has　a　slight　influence　on　the　bond　strength　and　peak　slip　while　ignorable　on　bond　stiffness.　The　variation　in　rib　height　of　FRP　bars　changes　the　bond　strength　and　the　descending　part　of　bond-slip　curves,　showing　no　regularity　on　bond　stiffness　and　peak　slip.　The　influence　of　rib　spacing　on　bond　performance　is　irregular.　As　the　strain　rate　increases,　the　bond　strength　of　FRP　bars　to　concrete　is　increased　continuously　while　the　peak　slip　is　reduced　firstly　and　then　increased.　The　empirical　formula　in　the　form　of　two　power　functions,　considering　the　strain　rate　effect　of　bond　strength　and　peak　slip,　can　reasonably　reproduce　the　dynamic　bond-slip　relationships　between　FRP　bars　and　concrete　to　a　certain　degree