overstressed walls under and above a thick transfer slab
overstressed walls under and above a thick transfer slab
(OP)
Hi guys,
I am working on a structure where i have a thick transfer slab supporting walls from above and resting on walls below. I have conducted the analysis and found that a big part of the walls at the floor directly above and directly below are overstressed in shear. When u go down (or up), all the walls become ok versus shear. As a first trial, i have selected all the walls overstressed and reduced their stiffness (the one related to the shear) so they can throw some of their shear to the adjacent elements (the ones that can carry an additional shear force).
I am aware that a construction sequence should be conducted to evaluate a more correct shear. The problem is that a non linear version isnt available right now (it will take some time to arrive). so i will do it manually by deleting floors through several runs and adding shear forces (i am talking of adding of shear force of the own weight only).
Any comments or suggestions ?
thank you
I am working on a structure where i have a thick transfer slab supporting walls from above and resting on walls below. I have conducted the analysis and found that a big part of the walls at the floor directly above and directly below are overstressed in shear. When u go down (or up), all the walls become ok versus shear. As a first trial, i have selected all the walls overstressed and reduced their stiffness (the one related to the shear) so they can throw some of their shear to the adjacent elements (the ones that can carry an additional shear force).
I am aware that a construction sequence should be conducted to evaluate a more correct shear. The problem is that a non linear version isnt available right now (it will take some time to arrive). so i will do it manually by deleting floors through several runs and adding shear forces (i am talking of adding of shear force of the own weight only).
Any comments or suggestions ?
thank you






RE: overstressed walls under and above a thick transfer slab
I hope this helps,
Rgs
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: overstressed walls under and above a thick transfer slab
Yes, I am using Etabs. i have verified the results given by Etabs and matched the hand calculations. I will be interested to know how did u overcome this issue specially that the more i thicken the walls, the more shear i will get.
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
i have attached for u 2 screenshots of the walls below the transfer and the walls above. as u can notice, walls below and above layout is totally different. the high shear values are coming from the defections (minor) that the slab is experiencing. I tried to multiply the slab inertia by 10 and the shear values decreased 20%.
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
RE: overstressed walls under and above a thick transfer slab
These shear walls would likely be non-flexural elements, so the most appropriate approach in design would be strut and tie, not beam theory.
RE: overstressed walls under and above a thick transfer slab
How tall is this building? It is a shame that you have a 3m thick transfer slab.
RE: overstressed walls under and above a thick transfer slab