Many seismic regions have seen recently an ever-increasing use of probabilistic performance-based procedures in the design and the assessment of structures. In such procedures the relationships between expected seismic performance levels of the building, usually identified with different levels of structural damage, and ground motion intensity measures are investigated. In order to estimate the structural response with high levels of accuracy, nonlinear time-history analysis utilizing 2 or 3-D computer models are usually adopted. Sophisticated analytical tools are particularly needed when buildings characterized by irregular seismic behaviours are considered. The objective of the present work is the study of the torsional response of asymmetric-plan RC frames subjected to bi-directional earthquake loads. Selected for the investigation is a three-story irregular structure designed to resist to vertical loads only. Natural strong motion accelerograms are used for exciting the structure far into the nonlinear range. Local and global displacement-based response quantities, namely element and roof inter-storey drift ratios, are observed. The prediction power of intensity measures derived from the elastic response of a single-degree-of-freedom system or obtained only from the properties of the ground motion records is investigated.
SEISMIC RESPONSE OF ASYMMETRIC RC FRAMES SUBJECTED TO BI-DIRECTIONAL GROUND MOTIONS / Lucchini, Andrea; Mollaioli, Fabrizio; Monti, Giorgio; S., Kunnath. - ELETTRONICO. - 1:(2011), pp. 111-114. (Intervento presentato al convegno fib Symposium Prague - Concrete engineering for excellence and efficiency 2011 tenutosi a Praga nel 8-10 June 2011).
SEISMIC RESPONSE OF ASYMMETRIC RC FRAMES SUBJECTED TO BI-DIRECTIONAL GROUND MOTIONS
LUCCHINI, Andrea;MOLLAIOLI, Fabrizio;MONTI, Giorgio;
2011
Abstract
Many seismic regions have seen recently an ever-increasing use of probabilistic performance-based procedures in the design and the assessment of structures. In such procedures the relationships between expected seismic performance levels of the building, usually identified with different levels of structural damage, and ground motion intensity measures are investigated. In order to estimate the structural response with high levels of accuracy, nonlinear time-history analysis utilizing 2 or 3-D computer models are usually adopted. Sophisticated analytical tools are particularly needed when buildings characterized by irregular seismic behaviours are considered. The objective of the present work is the study of the torsional response of asymmetric-plan RC frames subjected to bi-directional earthquake loads. Selected for the investigation is a three-story irregular structure designed to resist to vertical loads only. Natural strong motion accelerograms are used for exciting the structure far into the nonlinear range. Local and global displacement-based response quantities, namely element and roof inter-storey drift ratios, are observed. The prediction power of intensity measures derived from the elastic response of a single-degree-of-freedom system or obtained only from the properties of the ground motion records is investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
