Shear　tests　on　63　super-tightened　high-strength　bolt　groups　were　carried　out　to　investigate　the　damage　mode,　load　displacement,　ductility,　and　other　mechanical　indicators.　The　effects　of　key　parameters　such　as　different　core　plate　thickness,　super-tightened　bolt　number,　super-tightened　bolt　position,　and　the　high-strength　bolts　preload　force　on　the　shear　performance　of　high-strength　bolt　group　were　analyzed.　The　finite　element　model　was　built　and　a　parametric　expansion　investigation　was　carried　out.　Results　have　demonstrated　that　the　failure　mode　is　typical　bolt　shear　damage,　with　cover　end　deformation　and　bolt　hole　extrusion　deformation.　The　increment　of　super-tightened　bolts　number　and　the　super-tightened　bolt　preload　improve　the　anti-sliding　bearing　capacity.　However,　plate　thickness　and　super-tightened　bolt　position　have　no　effect　on　the　anti-sliding　bearing　capacity.　The　shear　ultimate　bearing　capacity　of　the　super-tightened　high-strength　bolt　group　is　not　significantly　different　from　that　of　the　standard　specimen.　The　ductility　is　negatively　correlated　with　the　number　of　super-tightened　bolts　and　the　super-tightened　bolt　preload,　but　the　decrease　percentage　is　within　25%.　Additionally,　the　results　obtained　from　the　finite　element　simulation　are　in　agreement　with　the　experimental　findings.　The　simulation　analysis　shows　that　increasing　the　strength　grade　of　high-strength　bolts　would　enhance　the　ultimate　bearing　capacity.　The　specimens　treated　with　sprayed　quality　quartz　sand　exhibit　a　higher　anti-sliding　bearing　capacity　compared　to　those　with　a　clean　rolled　plate　surface.　Finally,　the　genetic　algorithm　was　used　to　obtain　the　optimal　and　most　unfavorable　states　under　different　mechanical　properties　based　on　experimental　data.　©　2023