This　paper　focuses　on　the　mechanical　properties　of　bolt-fastened　wedge　(BFW)　joints　utilized　in　prestressed　internal　support　under　eccentric　loading.　The　validated　finite　element　model　was　established　based　on　the　fullscale　test　results　of　BFW　joints　subjected　to　eccentric　loads.　A　series　of　numerical　simulations　were　conducted　to　systematically　investigate　the　bearing　capacity　and　bending　performance　of　the　BFW　joint　under　eccentric　loads.　The　influence　of　eccentricity,　web　thickness,　eaves　thickness,　base　splint　thickness,　bolt　strength,　and　bolt　diameter　on　the　load-bearing　and　bending　performance　of　BFW　joints　was　investigated　through　further　parametric　evaluations.　A　four-parameter　exponential　moment-rotation　model　was　developed　based　on　the　numerical　results,　demonstrating　its　accurate　representation　of　failure　modes,　load-displacement　curves,　and　momentrotation　curves　observed　in　full-scale　tests.　The　load-bearing　and　bending　performance　of　the　BFW　joint　exhibited　a　predominantly　positive　correlation　with　parameters　such　as　web　thickness,　eave　thickness,　bolt　strength,　and　bolt　diameter;　however,　the　effects　of　these　parameters　were　inconsistent.　The　influence　of　bolt　strength　and　diameter　was　found　to　be　the　most　significant,　while　the　effect　of　splint　thickness　was　minimal,　indicating　a　considerable　level　of　redundancy.　As　eccentricity　increased,　there　was　a　decline　in　both　load-bearing　and　bending　performance　of　the　BFW　joint.　Finally,　a　comparison　between　the　results　obtained　from　fitted　formulas　and　numerical　as　well　as　experimental　data　revealed　that　the　moment-rotation　model　accurately　described　the　bending　performance　of　the　BFW　joint　under　eccentric　loads.