In　order　to　realize　the　modularity　and　rapid　assembly　of　steel　reticulated　shells　in　the　construction　site,　a　new　type　of　simple　assembled　joint　named　semirigid　pin　joint　is　proposed　for　modular　steel　reticulated　shell　in　this　paper.　While　on　the　premise　of　meeting　the　stiffness　and　strength　requirement,　complicated　procedures　such　as　tightening　nuts　and　controlling　pretightening　force　are　avoided　in　this　joint.　In　addition,　the　joints　can　adapt　to　the　complex　curvature　changes　of　reticulated　shells.　When　it　is　connected　in　the　middle　of　the　member,　the　new　joint　can　realize　the　connection　of　arc　members.　First,　experiments　were　carried　out　on　different　screw　rod　diameters,　wing　plate　pin　diameters,　and　the　number　of　wing　plate　pins.　Different　failure　modes　and　M-Phi　curves　of　semirigid　pin　joints　were　obtained.　The　stiffness　and　strength　of　the　joints　were　studied.　Second,　a　three-dimensional　finite　element　model　of　the　joint　was　established　by　ABAQUS,　and　the　comparison　between　the　simulated　results　and　the　experimental　results　proved　the　accuracy　of　the　finite　element　numerical　analysis.　On　this　basis,　the　antirotation　stiffness,　strength,　and　failure　mode　of　the　new　joint　with　different　parameters　were　compared　and　discussed,　and　the　influence　law　of　each　parameter　on　the　mechanical　properties　of　the　new　joint　was　obtained.　Finally,　based　on　the　power　function　model,　a　theoretical　analysis　model　for　estimating　the　M-Phi　curve　of　the　joint　was　established.　Compared　with　the　results　of　the　experiments,　the　results　indicated　that　the　prediction　formula　has　high　accuracy.