Hello Everyone,
I noticed that in STAAD Pro when I use to analyze and design a building model all the floor beams at different levels are considered, considering the fact that all the floor beams are at different elevations from the ground level but practically it is not the case as "TIE BEAMS" usually rests on the ground surface and hence usually it is found that in practical case that the beams at the tie level is of smaller dimensions and even the reinforcement provided is quite less in comparison to other floor beams as we all are aware of the fact that tie beams usually carry the wall loads not the floor loads as at tie level usually the floors loads gets transferred to the soil directly and even the tie level beams gets support of the soil directly.
How to assign tie level beams in order to instruct STTAD Pro that this beams are considered as ground beams so as to isolate from the beams of other floor levels?
If you would like to model the soil supports for the tie beam, you can split the member into multiple segments and define spring supports simulating soil at the segment nodes. Depending on whether these beams are connected between your columns or between your footings ( grade beams) you would define these beams connecting the column members or the supports respectively. You can always apply appropriate loading on the member. For example if the tie beam is supporting a wall, apply the wall load as a uniformly distributed member load. Also if the floor at that level is directly supported by the soil, then you do not need to consider the floor load in the structural analysis. I hope this provides some direction.
Answer Verified By: ARIF AHAMED
Hi sir, can you please narrate/teach how to "define spring supports simulating soil at the segment nodes"???
And what soil data will i need?
So i can model tie beams corrrectly, im also designing tie beams at the moment but large dimensions and many rsb's are the results since i have not considered the soil support.