In　order　to　investigate　the　fracture　behavior　of　steel　fiber　reinforced　concrete　materials　at　low　temperatures,　3D　numerical　models　of　concrete　specimens　with　different　volume　fractions　of　steel　fibers　(V=0.0%,　0.5%　and　1.0%)　were　developed　at　the　meso-scale　by　means　of　finite　element　analysis,　and　splitting　tensile　strength　tests　as　well　as　three-point　bending　loading　tests　were　conducted　at　three　temperatures　(T=20　℃,　−40　℃　and　−80　℃).　The　corresponding　damage　modes　and　load-span　deflection　curves　were　obtained.　The　results　show　that　the　fracture　energy　of　concrete　tends　to　increase　with　the　decrease　of　temperature,　and　the　fracture　energy　increases　with　the　increase　of　fiber　volume　fraction.　The　characteristic　length　of　concrete　decreases　with　decreasing　temperature,　but　the　addition　of　fibers　largely　increases　its　characteristic　length.　©　2023　Tsinghua　University.　All　rights　reserved.