Precast concrete stair core - projected stair flight self weight

[Anonymous]

Hi, I was wondering if anyone could help me, I am currently modelling a precast stair core in Robot and was wondering when I model a stair flight as a diagonal slab, is this load taken as a projected load for the self weight of the stair flight concrete slab? I have modelled in the dead weight of the risers separately and have now changed them to a projected load, however is the self weight of the slab itself taken as a projected load? or do I need to define this in the load definition? I have attached screencast link below hopefully it works. your help on this would be appreciated!

[Anonymous]

Hi, I was wondering if anyone could help me, I am currently modelling a precast stair core in Robot and was wondering when I model a stair flight as a diagonal slab, is this load taken as a projected load for the self weight of the stair flight concrete slab? I have modelled in the dead weight of the risers separately and have now changed them to a projected load, however is the self weight of the slab itself taken as a projected load? or do I need to define this in the load definition? I have attached screencast link below hopefully it works. your help on this would be appreciated!

[Artur.Kosakowski · Accepted solution]

The self weight by default acts in the vertical (-Z) direction and is the function of the panel area, its thickness and the density of a material assigned to it. In other words it is not projected and IMHO should not be. 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous]

Thanks for the reply, when you talk about the -Z direction, is that in the global orientation or local panel orientation? I.e, if a stair flight is on a slope, the local panel z axis is in the diagonal direction? 

[Artur.Kosakowski]

It is in the global direction. You can decide on X+/X-/Y+/Y-/Z+/Z- where the last is the default self weight direction.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous · Accepted solution]

Thanks.

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