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If you are talking about the seismic base shear, Vx or Vy; they are equal only when the structure has the same period of vibration for both directions.

neznajko thank you for your answer. I'm using the period only for the lateral force distribution. The problem is that i'm using the composite deck as semi-rigid diaphragm. Any suggestions about this case?

Hi everyone. I'm doing a seismic design of a 10 story steel building with composite slabs and i want to know wich are the best properties modifiers to get the more accurate period of the structure. In my first analysis, i used f11, f22, f12, m11, mm2, mm12 = 0.25 but i'm not really sure about...

Thanks for your answer KootK. I will use ASCE 7-10 load case which uses 100% of the capacity requirement from one loading direction and 30% from the other direction.

Hello everyone. I have a question about BRBF system. FEMA 450 recommendations say that columns forming part of the BRBF system must be checked assuming that BRB reaches its maximum strength corresponding to a 2x story drift. My question is, in a corner column, where two orthogonal BRB are...

Yes, your definition is correct. First of all, the modulus of the subgrade is positive if the area local axis 3 is in the same direction as the global Z axis. Also, to place restraints in the x and y direction you just have to assign values to the Local 1 and Local 2 'Springs Constants'...

Hi all. I'm starting using Starnd7 and I'd like to learn how to model a buckling restrained brace, specifically the transition zone between the core and the surrounding mortar. I need to model this gap zone in a way that only transfer the compressive stresses when the core is deformated and is...