Hello, Your system consists of discontinuous frames and especially columns of large length. I think the system selection is not good. If possible, look for ways to make more effective column-wall-beam design together with the architectural project. The real building - the project and the model you set up is to be reflected in the program in the most appropriate way. For example, if we consider elements such as the basement floor beam K21; It is connected to a column (wall) element with a very high rigidity from one end. Since the earthquake effects are already great on the rigid shear, naturally there is a problem with your beam. This is the simplest explanation for shear and torsion problems. However, if you model large-length or semi-tubular curtain elements such as LU as shells, you will create a model closer to the real behavior. The rigid arms are uniformly distributed in the curtain and the beam makes a more harmonious displacement with the curtain. *** Stiffness reduction is not applied in the program for beams with curtains on one end and columns on the other. (50% automatic reduction is done if the beam is connected to the curtain at both ends). Since there may be articulation in the support where the beam is attached to the curtain, it may be appropriate to reduce the stiffness in those supports. I think your basic system is not suitable for this structure. It may be appropriate to solve the project with beamless raft flooring by modeling the curtains and "curtains that you enter as columns" as shells. Good work...
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