The　evaluation　of　the　loss-of-support　conditions　of　frictional　beam-to-column　connections　using　simplified　numerical　models　describing　the　transverse　response　of　a　portal-like　structure　is　presented　in　this　paper　considering　the　effects　of　the　seismic-hazard　disaggregation.　Real　earthquake　time　histories　selected　from　European　Strong-motion　Database　(ESD)　are　used　to　show　the　effects　of　the　seismic-hazard　disaggregation　on　the　beam　loss-of-support　conditions.　Seismic　events　are　classified　according　to　different　values　of　magnitudes,　epicentral　distances　and　soil　conditions　(stiff　or　soft　soil)　highlighting　the　importance　of　considering　the　characteristics　of　the　seismic　input　in　the　assessment　of　the　loss-of-support　conditions　of　frictional　beam-to-column　connections.　A　rigid　and　an　elastic　model　of　a　frame　of　a　precast　industrial　building　(2-DoF　portal-like　model)　are　presented　and　adopted　to　find　the　minimum　required　friction　coefficient　to　avoid　sliding.　Then,　the　mean　value　of　the　minimum　required　friction　coefficient　with　an　epicentral　distance　bin　of　10　km　is　calculated　and　fitted　with　a　linear　function　depending　on　the　logarithm　of　the　epicentral　distance.　A　complete　parametric　analysis　varying　the　horizontal　and　vertical　period　of　vibration　of　the　structure　is　performed.　Results　show　that　the　loss-of-support　condition　is　strongly　influenced　by　magnitude,　epicentral　distance　and　soil　conditions　determining　the　frequency　content　of　the　earthquake　time　histories　and　the　correlation　between　the　maxima　of　the　horizontal　and　vertical　components.　Moreover,　as　expected,　dynamic　characteristics　of　the　structure　have　also　a　strong　influence.　Finally,　the　effect　of　the　column　nonlinear　behavior　(i.e.　formation　of　plastic　hinges　at　the　base)　is　analyzed　showing　that　the　connection　and　the　column　are　a　series　system　where　the　maximum　force　is　limited　by　the　element　having　the　minimum　strength.　Two　different　longitudinal　reinforcement　ratios　are　analyzed　demonstrating　that　the　column　strength　variation　changes　the　system　response.　Copyright　©　2017　Techno-Press,　Ltd.