A fiber beam-column finite element based on Timoshenko beam theory has been recently proposed by the author to model the flexure-shear interaction in reinforced concrete elements of reduced shear slenderness subjected to seismic loading. Shear resistance is obtained by modeling the principal resisting mechanisms; these are linked to the flexural behavior by means of suitable kinematics assumptions. In flexure the element differs from standard fiber beam element since, to account for the contribution to shear resistance due to arch action, fibers, which are normal to the cross-section in standard fiber elements, are here rotated. Materials non-linear behavior is taken into account by means of uniaxial and interfaces constitutive relations available in literature. The element, initially developed to model the cyclic response of the dissipative end zones of R/C bridge piers having low to intermediate shear slenderness, has been further validated in this work by reproducing some cyclic experimental results on a shear wall. The agreement with the experimental results highlights the element ability to capture the behavior of moment-resisting structural elements subjected to high shear loading.
Un modello per l'interazione taglio-flessione in elementi in C.A. soggetti ad azioni sismiche
MARTINELLI, LUCA
2000-01-01
Abstract
A fiber beam-column finite element based on Timoshenko beam theory has been recently proposed by the author to model the flexure-shear interaction in reinforced concrete elements of reduced shear slenderness subjected to seismic loading. Shear resistance is obtained by modeling the principal resisting mechanisms; these are linked to the flexural behavior by means of suitable kinematics assumptions. In flexure the element differs from standard fiber beam element since, to account for the contribution to shear resistance due to arch action, fibers, which are normal to the cross-section in standard fiber elements, are here rotated. Materials non-linear behavior is taken into account by means of uniaxial and interfaces constitutive relations available in literature. The element, initially developed to model the cyclic response of the dissipative end zones of R/C bridge piers having low to intermediate shear slenderness, has been further validated in this work by reproducing some cyclic experimental results on a shear wall. The agreement with the experimental results highlights the element ability to capture the behavior of moment-resisting structural elements subjected to high shear loading.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
