STAAD Pro: How to apply PARTIAL PRESSURE load to a Slab/Wall entity with a transfering this load to its boundary members?

It is possible to apply partial pressure on the surface of the plate. Choose the the local coordinate for the  start and end point of the diagonal of the square or rectangle. The area will be created whose diagonal is defined by the above two points/nodes and load can be applied on the partial area so created by the diagonal in the direction defined by you. LIke wise point load also can be applied on the plate on the node created by the local coordinate of the node. In my perception partial pressure can be applied only on the square or rectangular area.

It is possible to apply partial pressure on the surface of the plate. Choose the the local coordinate for the  start and end point of the diagonal of the square or rectangle. The area will be created whose diagonal is defined by the above two points/nodes and load can be applied on the partial area so created by the diagonal in the direction defined by you. LIke wise point load also can be applied on the plate on the node created by the local coordinate of the node. In my perception partial pressure can be applied only on the square or rectangular area.

It 's OK, sureshprsharma. But, I meant the partial pressure on a surface ENTITY, not on a surface or plate element.

For clarity, we consider an "area of UDL" on a floor for instance, not a UDL imposed fullly on the floor. The floor may be triangular, quadrilateral or polygonal. The floor is supported by beams along the perimeter.

If we model the floor as a plate or surface ENTITY we will excersice easily the partial pressure load for such the UDL said above, but no load transference between beam and floor.

(Noting that the loading area of Partial Pressure in STAAD Pro is allowed to only be rectangular.)

If we model the floor as many plates or surface elements we will get the load transference between floor and beams. The plates can be generated after meshing or created manually using "Add Plate" from Geometry menu. Thereafter we need just to apply "Partial Plate Pressure" on several exterior plates which are relevant to the boundary of the partial pressure area; while "Pressure on Full Plate" is applied to the interior plates. Doing in such manner does not enable the resultant UDL to be the same as the "area of UDL", and is complicated or unsuccessful due to the allowed loading area of UDL in STAAD, if the meshes are triangular.

This is challenging me. Can any one deal with it please?

Firstly your question is not clear to me.

The procedure for application of load on surface and plate is almost identical. If you wish to get the result out of surface/plate load same as that was defined by floor load, would not be a prudent expectation. While plate load is transferred to the beam by way of concentrated load through the various nodes generated on the beam in course of generating plate/surface. Floor load is transferred to the beam as trangular, trapezoidal or udl as per geometry of the floor. The two results may be very close to each other but not the same.

We add floor to the model is to, of course the analysis time and PC memory are consumed significanlty:

1-Take the true loading and realistic stiffness of whole structure into account rather than modelling with MEMBERs only.

2-Facilitate the loading of PARTIAL PRESSURE on floor with opening to the structure, while FLOOR LOAD and AREA LOAD are unable for Partial Pressure and for a floor with opening, and of course FLOOR LOAD and AREA LOAD are able only for the floor panel of only MEMBERs.

Obviously the load is transferred through the nodes generated from meshing. But, how can we apply the PARTIAL PRESSURE after such a series of plates is generated? If we do not mesh the SURFACE (of the floor) we apply easily the PARTIAL PRESSURE. For instance, with a LOAD of which the loading area (UDL) is 2m by 3m placed on a pentagonal floor with overal size of 10m, it is easy to apply PARTIAL SURFACE PRESSURE LOAD, but it is impossible to apply this LOAD or the divided loading areas of it to the floor after meshing. (Meshing the surface generates many plates of smaller sizes, even though the size of the loading area, obviously gives proper transference of load).

Anyway, I realised a way to deal with, but not have checked if I am right. Can anyone deal with?

Please check the correctness of what you have done and post.

Another problem: The Contour Type of Enhanced Fill includes spots. I wonder why an If this is caused by the surface mesh size which is too fine. I do not know how to increase the mesh size of the surface to an appropriately acceptable size. In the image below that I modelled the floor and wall as surface entities, the contour is for bending moment in floor and walls,the diagram is for bending moment in beams.

Can any mentor help explain and deal with?