If i model my project and add slab,what will be the difference if i dont generate plate mesh, after adding slab i add load and run analysis without generating mesh.
In Ram Concept? The program will always generate the mesh before you run the calculations. If there is a minor error in the first mesh generation, you may choose to skip re-meshing it again the next time. It's a best practice to regenerate the mesh after the design strips are modeled so that the mesh aligns with the strips as best possible.
Not in RAM, i ask in Staad Pro Connect Edition,for a person who has model and add slab without generating mesh,what will be the effect of load distribution on beams
In continuation of above, I have one more question -
How to design reinforcement of slab if we meshed a plate into 'n' no of plates ? Because in this case, every small plate have different value of BM and stresses. Same is the case for beam.
In practical case, slab and beam can't be design for 'n' no of small small elements.
I have also attached modified staad file after meshin
If you do not mesh the slab, any load acting on the slab will bypass the beams and go directly into the column. So, the slab load will not induce any bending in the beams. That slab load will not induce any bending in the slab either. In the stiffness method, the pressure is converted to concentrated forces and concentrated moments at the 4 corners of the slab. For an unmeshed slab, the 4 corners coincide with the top nodes of the columns. So, the entire slab load goes directly as point forces and moments on the columns.
Regarding viewing the applied loads - see below:
Use the programs RAM Concept or RCDC FE for designing the slab.
Use the program STAAD Advanced Concrete Design (also known as RCDC) for designing the beams.
I have seen many tread, where we can design a slab using " Floor load" also. My question is - " If we're designing a slab using "floor load" (without generating plate), how can we get the output of slab reinforcement details in this case?, because in this case, all the stresses will transfer to the beam directly and further to the column through column and may lead to design of over reinforced beam.
I have run an experiment analysis where I am getting higher reinforcement in beam (say beam no X) (when the structure is designed using Floor Load method instead of plate meshing under same loading condition) ?
Which one method is more accurate Floor load or plate meshing to design ?
I would recommend meshing the slab together with the beams - through the common nodes they will act as monolith. Apply plate loads to the plates and the loading will be distributed to beams below, etc.. If you apply floor load - it will be applied to beams, not plates. Then design beams and plates as mentioned before.
I have designed slab using parametric model (By Generating Plate mesh) and compare results by applying 1)Plate pressure load 2) Floor Load. And I got the different results in both the case. Please help me to know, which approach is the realistic approach to design slab ?
1) As, I am getting max stresses in the middle portion of the slab under plate pressure loading condition and max stresses in the middle edge beam under floor loading condition.
P.S - While Applying Plate Pressure and Floor Pressure (Keeping load value and all other parameters same for comparison)
Case 1 - Design Beam and Slab by applying Plate pressure load uniformly distributed over whole slab (In this case I am getting max stresses at the center of the plate)
Case 2 - Design Beam and Slab by applying load of Floor pressure (In this case I am getting max stresses at the middle beam).
Case - 1 Beam Design with Plate Pressure Loading
Case - 1 Plate Design with Plate Pressure Loading
Case 2 - Beam Design with Floor Pressure Loading
Case 2 - Plate Design with Floor Pressure Loading
Please help me with the answer
The results for both approaches are as expected. To design the structure where the loads are distributed over the plate that is supported by beams - go with the plate load approach. If you are not designing the slab and it is only transferring the loads to beams - go with floor load (which will include the slab self weight too).Basically, the plate mesh generation is necessary to ensure the connectivity between other elements, proper load transfer, and generation of proper analysis results - deflections, moments, other.