After a lot of search here and there I come to the conclusion that there is no proper method in staad to analyse and design shear wall as per Indian code, particularly in regard to application of lateral load at the shear centre, bifurfucation of 25% and 100% load etc,
If you can provide some more details of the problem you are facing, specifically the sections of the code that are not compatible with the program's capabilities, we can look into it.
When I do not know the shear centre of shear wall, how can I apply the shear force which should be applied to the shear centre. How shall I distribute the shear force at different floor level? How can I ensure that 25% shear force is taken by the frame alone along with gravity load? Whether dynamic analysis can be done with shear wall in the frame. If yes how shall I apply the lateral shear force? Whether there will be any difference in the output if I apply dynamic shear force obtained from Response Spectrum in +X or –X direction because motion of the frame is in both the direction at a time.
What does shear centre of a shear wall mean? Aren't shear centres associated with cross sections like channels or angles?
A load like gravity is distributed through every particle of the wall, so, when the wall is accelerated by a seismic movement, the force caused by the acceleration will act throughout the body of the wall. Isn't modeling the wall using a sufficiently dense plate element mesh an adequate way to represent this?
Response spectrum results being absolute quantities, applying a spectrum along -X wouldn't be any different from applying it along +X. Both yield positive numbers. +X or -X would make a difference only if you use a static method like ELFP.
Suppose I get the base shear from the static or dynamic analysis. Now my job would be to assign and distribute the shear force so obtained to the shear wall, isolating the frame (from shear wall) so that entire shear force is taken by the shear wall alone and analyse and design the shear wall. How can I do the above exercise with the software? Whether Staad can design shear wall as per Indian code. As per my understanding the shear wall has to be analysed and designed in isolation( i.e. without frame in the model) with the lateral load. May I request you to post a sample file to explain the sbove exercise?
Suresh ji ,
I think modelling the wall along with the frame is more pracitcal, after the the lateral for due to eccentricities will get distributed as per stifeness.
Regarding 25% issue it needs trial and error, check the base reaction(Horizontal), sum it up for columns and also find that of wall.