The　rate　sensitivity　of　concrete　strength　is　one　of　the　important　scientific　problems　in　the　field　of　concrete　mechanics.　The　existing　prediction　methods　for　the　dynamic　increase　factor　of　concrete　are　still　mainly　based　on　the　data　fitting　model,　and　the　fitting　parameters　usually　have　no　actual　physical　significance,　thusly　it　cannot　relate　to　the　mechanism　interpretation　of　the　concrete　rate　sensitivity.　This　paper　takes　the　tensile　strength　of　concrete　as　the　research　object.　Based　on　the　basic　concepts　of　self-consistent　finite　stress　model　and　on　Newton＇s　law　of　motion,　derived　and　established　is　the　mathematical　equation　of　a　dynamic　increase　factor　which　can　reflect　the　strain　rate　effect　mechanism　of　concrete.　Based　on　a　fib　specification　model　and　a　J　criterion　model,　proposed　is　a　semi-analytical　and　semi-empirical　analysis　method　to　analyze　the　dynamic　increase　factor　of　concrete　tensile　strength.　Through　the　case　analysis　based　on　mesoscopic　numerical　tests　and　the　comparison　based　on　the　test　data　in　the　literature,　it　is　verified　that　the　analytical　model　revised　can　effectively　reflect　the　real　physical　law　of　the　dynamic　increase　factor　of　concrete　tensile　strength.　©　2025　Tsinghua　University.　All　rights　reserved.