Steel　fiber　reinforced　concrete　(SFRC)　is　composed　of　coarse　aggregate　particles,　mortar　matrix,　fibers,　pores　and　microcracks　from　the　viewpoint　of　meso-scale.　To　reflect　the　mesoscopic　characteristics　more　realistically,　a　three-dimensional　meso-scale　model　for　SFRC　was　established.　In　the　model,　the　fibers　were　explicitly　modelled　while　the　concrete　matrix　was　regarded　as　a　tri-phase　composite　consisting　of　aggregate,　mortar　matrix　and　the　interface　transition　zones　(ITZs)　between　them.　Based　on　the　idea　of　classical　random　aggregate　model　for　plain　concrete,　a　programme　was　designed　to　randomly　distribute　aggregate　particles　and　steel　fibers.　The　meso-scale　numerical　model　was　verified　by　the　good　agreement　between　simulation　results　and　the　available　test　results.　The　dynamic　failure　behavior　of　SFRC　at　room　and　elevated　temperatures　was　investigated　by　utilizing　the　simulation　method.　The　simulation　results　indicate　that　for　fiber　content　no　larger　than　2%　volume,　the　influence　of　steel　fiber　on　thermal　conduction　of　SFRC　can　be　ignored.　Compared　with　that　of　plain　concrete,　strain　rate　effect　on　compressive　strength　of　SFRC　is　weaker　and　it　would　be　further　decreased　under　high　temperatures.　The　improvement　of　SFRC　performance　induced　by　steel　fiber　increases　for　higher　fiber　volume　fraction　whilst　decreases　with　respect　to　strain　rates,　regardless　of　temperature.　When　the　fiber　amount　is　identical,　the　dynamic　compressive　strength　of　SFRC　decreases　slightly　in　the　case　of　larger　fiber　diameter　or　smaller　fiber　length.　(C)　2021　Elsevier　Ltd.　All　rights　reserved.