This　study　focuses　on　the　bending　failure　performance　of　a　shield　tunnel　segment.　A　full-scale　test　was　conducted　to　investigate　deformation　and　failure　characteristics.　During　the　loading,　the　bending　failure　process　can　be　divided　into　four　stages:　the　elastic　stage,　working　stage　with　cracks,　failure　stage,　and　ultimate　stage.　The　characteristic　loads　between　contiguous　stages　are　the　cracking,　failure,　and　ultimate　loads.　A　numerical　model　corresponding　to　the　test　was　established　using　the　elastoplastic　damage　constitutive　model　of　concrete.　After　a　comparative　analysis　of　the　simulation　and　test　results,　parametric　studies　were　performed　to　discuss　the　influence　of　the　reinforcement　ratio　and　proportion　of　tensile　longitudinal　reinforcement　on　the　bearing　capacity.　The　results　indicated　that　the　change　in　the　reinforcement　ratio　and　the　proportion　of　tensile　longitudinal　reinforcement　had　little　effect　on　the　cracking　load　but　significantly　influenced　the　failure　and　ultimate　loads　of　the　segment.　It　is　suggested　that　in　the　reinforcement　design　of　the　subway　segment,　the　reinforcement　ratio　and　the　proportion　of　tensile　longitudinal　reinforcement　can　be　chosen　in　the　range　of　0.7%-1.2%　and　49%-55%,　respectively,　allowing　the　segment　to　effectively　use　the　reinforcement　and　exert　the　design　strength,　thereby　improving　the　bearing　capacity　of　the　segment.