In STAAD, it is not possible to create a castellated/cellular section using user table or section wizard. Only way is to add the section directly in the database under castellated beam table. You can check these series to know how to modify the database and add a section -- ru-vid.com/group/PLxLi_mmlPeioHRG0lEmch7O478WV0fMNz
Modelling of PEB building will be covered in the upcoming series. There are several tricks which I will discuss in this series along with few custom templates.
It depends on several factors including unsupported span, support condition, applied load. Better to model it separately and compare the MTO to get an idea which is more economic.
We have delivered an official webinar series on UG/at-grade water tank modelling analysis and design last year. Though ACI/ASCE code is not used, still you can get an idea how to handle such water/waste water tank design. You can check the recorded session using this link -event.on24.com/eventRegistration/EventLobbyServletV2?target=reg20V2.jsp&eventid=3201700&sessionid=1&key=1863895E1477266F68D84C19B9AC2828&groupId=2459179&partnerref=web&sourcepage=register By the way, I have developed a custom template to apply hydrodynamic load on water tank which will be published soon.
This section in not available in the standard database, so either you can use the define tube option available under standard tube section database to define the custom dimensions. If you use this section frequently, then you can customize the standard database and add this section. Check this video for more details -- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3bjgDY90mCk.html
