Rot Index for Assessing the Torsional Effect on the Seismic Performance of RC Buildings

Abstract eng:
Due to the eccentric setback nature of structures, torsional moments will be induced by a set of lateral loads on buildings. Although the effect on the response of reinforced concrete buildings was the subject of intensive research over the last decades still lacks a criterion valid in both elastic and plastic region. In this study a criterion capable of assessing torsional effect is proposed. In order to evaluate the proposed criterion with code provisions, two test examples are considered. A torsionally stiff, mass eccentric one-storey and a fourstorey horizontally irregular building designed according to Eurocode provisions subjected to bidirectional excitation are considered. Nonlinear dynamic analyses are carried out implementing natural record selected for three hazard levels. The performance of the proposed criterion is evaluated and its correlation with other structural response quantities like interstorey drifts, displacements, base torque, shear forces and diaphragm rotation is presented. Through this investigation it was found that the proposed criterion is able to provide a reliable prediction of the magnitude of torsional effects for all test cases considered.

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