THEORETICAL AND NUMERICAL FINDINGS ON THE REDUNDANT TORSIONAL STRESSES

Abstract eng:
Considerable research efforts and numerous publications, regard the torsional effects on shear cantilever types of building structures. This work concerns recent findings of the redundant torsional stresses, as quantified by the Ratio Of Torsion (ROT) index. In the first part, a large number of multiple test structures are considered in order to quantify associations between torsional design criteria and structural response parameters. The analysis of this database is performed through linear regression, as well as artificial neural networks. The results, depict that the center of twist and the ratio of torsion (ROT) index proved numerically to be highly correlated with the modal rotation and displacements, while utilizing the connection weights approach, the Center of Strength, Torsional Stiffness and the Base Shear Torque curves were found to exhibit the highest impact numerically. In the second part, a theoretical proof of the ratio of torsion (ROT) independency of the forces acting on the structure is provided. This is essential for other design and evaluation criteria against torsion such as center of rigidity and center of strength. However, in the case of ROT, this evidence could be characterized as inconsistent, since ROT is a function solely of the forces acting on the structural members, nevertheless it is proven to be independent of them. Given that ROT stands for the amplification of the shear forces due to in-plan irregularities, this work depicts that this increase of internal shear forces rely only on the structural topology.

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