The　elevated　fire　temperatures　cause　the　deterioration　of　the　mechanical　properties　of　BFRP　bars　and　concrete.　A　three-dimensional　refined　numerical　model　considering　the　surface　characteristics　of　ribbed　BFRP　bars　was　established　to　study　the　effect　of　high　temperature　on　interfacial　bond　performance.　The　“sequence　coupling”　method　analyzes　the　bonding　behavior　of　BFRP　bars　and　concrete　under　high　temperatures　or　after　natural　cooling.　The　validity　of　the　refined　model　was　verified　by　reproducing　the　available　test　results.　Then,　the　bond　behavior　was　compared　and　discussed.　Based　on　the　simulation　results,　a　constitutive　model　for　predicting　the　bond　performance　was　developed　by　modifying　the　available　model　at　room　temperature.　The　results　show　that　the　numerical　model　can　observe　the　bond　failure　mechanism　between　the　BFRP-concrete　interface.　The　specimens　after　natural　cooling　have　better　bond　performance　due　to　the　restoration　in　material　properties.　The　pull-out　failure　occurs　easier　at　high　temperatures,　owing　to　the　various　change　in　the　property　of　BFRP　bars　and　the　faster　increase　in　BFRP　strain.　The　influence　of　temperature　rise　on　peak　slip　is　more　significant　than　that　on　bond　strength.　The　bond　strength　and　peak　slip　decrease　linearly　with　the　increase　in　temperature.　Finally,　the　developed　bond　stress-slip　constitutive　model　considering　the　effect　of　temperature,　can　reasonably　predict　the　bond　behavior　between　BFRP　bars　and　concrete.　©　2023　Elsevier　Ltd