I cant just set P/A to zero, because there is no direct P/A component in my model for elastic stresses. I have set excel to initially choose a strain in the compressive fibre of the concrete, solve for the neutral axis based on equilibrium and then determine the resultant moment of the section...
rapt,
Could you have a look at the attachments I sent and tell me if that is correct for the limit state at transfer? Your help is much appreciated. For the elastic stress analysis should I find the geometrical centroid or the neutral axis assuming a triangular stress distribution in the...
Yeah I assumed the strength equations didnt need to be modified, except in places where axial deformation cannot occur the losses may slightly change.
"Yes, but that part is already accounted for in the strength equations. It sounds like he is trying to base the design stresses as if the PT...
I am currently setting up a spreadsheet to calculate strengths, stresses etc of prestressed beams and slabs. I have been instructed to have the option of whether or not to include the P/A component, as sometimes axial deformation cannot occur when the slab is say tied into stiff walls or frames...
I am currently setting up a spreadsheet to calculate strengths, stresses etc of prestressed beams ans slabs. I have been instructed to have the option of whether or not to include the P/A component, as sometimes axial deformation cannot occur when the slab is say tied into stiff walls or frames...
In safe the slab is modelled as a plate element. I just assumed that the thickening would be inputted as a rectangular beam and that safe would automatically calculate the beams stiffness taking into account the effective width of the flanges of concrete surrounding it. Would you suggest...
hey guys I am new to finite element analysis modelling and need to ask a basic question. Our company in the past has modelled elevated concrete slabs as a grillage of beams, and with a lot of tweaking accepteble results can be obtained. We are currently trialling the program SAFE, and comparing...
