The　longitudinal　bending　stiffness　of　tunnels　is　one　of　the　most　important　parameters　for　the　structural　design　of　the　tunnel　longitudinal　deformations　during　seismic　loading.　The　aim　of　the　paper　is　to　derive　an　analytical　solution　for　the　longitudinal　bending　stiffness　of　a　segmental　liner,　typically　used　on　tunnels　built　with　a　shield.　For　the　derivation,　it　is　assumed　that　the　tunnel　liner　includes　bolts,　segments　and　rubber　gaskets.　All　the　elements　are　considered　as　linear　elastic.　The　bolts　are　assumed　to　work　only　in　tension　and　the　rubber　gaskets　are　assumed　to　work　only　in　compression.　The　deformation　of　any　tunnel　cross　section　complies　with　the　assumption　that　normals　to　the　neutral　axis　remain　normal　and　thus　the　neutral　axis　does　not　change　along　the　tunnel　during　deflection.　Based　on　these　assumptions,　a　longitudinal　equivalent　model　for　shield　tunnels　is　developed　and　the　governing　equations　are　obtained.　A　closed-form　analytical　solution　for　the　longitudinal　bending　stiffness　is　developed　and　verified　by　providing　comparisons　between　its　results　and　those　from　the　Finite　Element　program　ABAQUS.　A　parametric　analysis,　using　the　new　analytical　solution,　is　included　to　investigate　the　influence　of　key　parameters　such　as　the　thickness　of　the　rubber　gaskets,　the　ratio　of　the　liner　thickness　to　the　internal　tunnel　diameter,　and　the　transverse　bending　stiffness　of　the　tunnel　cross　section　on　the　longitudinal　bending　stiffness　of　the　tunnel.