The selection and scaling criteria of natural Ground motions for Non Linear Time History analysis significantly influence the predictive capacity of the engineering demand parameters. This problem is even more felt in the case of 3d analysis on structures with irregular behaviour and, to date, there is no unique and recognized method in international codes and literature for this purpose. Herein is presented a 3D performance-based earthquake assessment of an industrial gas filter structure, characterized by the presence of important masses placed at significant height and of different horizontal resisting systems, such as moment resisting frames, inverted V bracings and diagonal bracings. A set of natural unscaled Ground motions is selected to be coherent with the Uniform Hazard Spectrum and then scaled to different Intensity Measures. The structural response is computed through push-over and Non-Linear Time history analyses with both scaled and unscaled sets. A comparison of the structural performance assessment is presented and discussed with focus on the predictive efficiency and sufficiency of the Intensity Measures adopted for scaling.
Performance based assessment of an industrial steel structure with scaled and unscaled ground motions
Francesco Morelli;Andrea Piscini;Walter Salvatore;
2017-01-01
Abstract
The selection and scaling criteria of natural Ground motions for Non Linear Time History analysis significantly influence the predictive capacity of the engineering demand parameters. This problem is even more felt in the case of 3d analysis on structures with irregular behaviour and, to date, there is no unique and recognized method in international codes and literature for this purpose. Herein is presented a 3D performance-based earthquake assessment of an industrial gas filter structure, characterized by the presence of important masses placed at significant height and of different horizontal resisting systems, such as moment resisting frames, inverted V bracings and diagonal bracings. A set of natural unscaled Ground motions is selected to be coherent with the Uniform Hazard Spectrum and then scaled to different Intensity Measures. The structural response is computed through push-over and Non-Linear Time history analyses with both scaled and unscaled sets. A comparison of the structural performance assessment is presented and discussed with focus on the predictive efficiency and sufficiency of the Intensity Measures adopted for scaling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
