The　coupling　between　axial　and　bending　stiffness　of　hollow　spherical　joint　should　be　considered　in　the　dynamic　failure　analysis　of　shell　element　model　in　order　to　obtain　more　accurate　results　than　the　commonly　used　beam　element　model.　However,　this　shell　element　model,　which　considers　the　coupling　effect　of　joint,　can＇t　be　used　in　simulation　generally,　because　in　the　case　of　huge　quantity　of　complicated　shell　elements,　much　more　time　consuming　will　be　needed　in　computation　than　the　common　model.　On　the　other　hand,　the　commonly　used　beam　element　model　needs　fewer　elements,　but　the　error　of　results　will　become　obvious　in　dynamic　analysis.　Accordingly,　a　new　relatively　simplified　model,　which　considers　the　effect　of　joint　stiffness　by　using　beam　element　in　the　spherical　joint　zone,　was　put　forward.　The　precision　of　simulation　can　be　improved　clearly　by　using　low　stiffness　tube　elements　in　the　joint　zone,　and　the　computing　time　does　not　increase　too　much.　The　model　is　fit　for　the　dynamic　stability　analysis　of　such　structures.