Eccentrically braced frames (EBF) represent an optimal structural solution for ductile buildings in seismic prone areas, characterized by high dissipative capacity, ability to withstand strong seismic events and good elastic stiffness, needed to avoid the damage of non-structural elements during low-to-moderate seismic events. The knowledge of the cyclic behaviour of the dissipative link elements is required to perform accurate nonlinear analyses: notwithstanding such aspects, there is a lack of modelling techniques of EBFs equipped with short links, which dissipate energy in shear, while usually simple bilinear springs with kinematic hardening constitutive laws are used, leading to not completely reliable results. In the main framework of the European Project “MATCH: Material choice for seismic resistant structures” (2013-2016), promoted by the RFCS (Research Fund for Coal and Steel) real scale experimental tests of frames equipped with vertical and horizontal shear links, have been performed, in order to precisely define the behaviour of dissipative shear links and to calibrate a semi-analytical model able to catch the cyclic behaviour of the shear links. The semi-analytical model has been then used to assess the influence of the correct modeling of shear links on the collapse behaviour of EBF seismic structures and to evaluate the influence of the ultimate plastic rotation on collapse. To this aim, two multistory buildings, equipped respectively with vertical and horizontal dissipative shear links have been firstly designed according to the actual European Standards (EN 1998-1:2005 2005) optimizing their global dissipative behaviour until the collapse and then analyzed through Incremental Dynamic Analyses (IDA) modeling the shear links both with a classical approach and with the proposed semi-analytical model.
A semi-analytical model for dissipative shear links: experimental tests and numerical analyses
CAPRILI, SILVIA;MUSSINI, NICOLA;SALVATORE, WALTER
2017-01-01
Abstract
Eccentrically braced frames (EBF) represent an optimal structural solution for ductile buildings in seismic prone areas, characterized by high dissipative capacity, ability to withstand strong seismic events and good elastic stiffness, needed to avoid the damage of non-structural elements during low-to-moderate seismic events. The knowledge of the cyclic behaviour of the dissipative link elements is required to perform accurate nonlinear analyses: notwithstanding such aspects, there is a lack of modelling techniques of EBFs equipped with short links, which dissipate energy in shear, while usually simple bilinear springs with kinematic hardening constitutive laws are used, leading to not completely reliable results. In the main framework of the European Project “MATCH: Material choice for seismic resistant structures” (2013-2016), promoted by the RFCS (Research Fund for Coal and Steel) real scale experimental tests of frames equipped with vertical and horizontal shear links, have been performed, in order to precisely define the behaviour of dissipative shear links and to calibrate a semi-analytical model able to catch the cyclic behaviour of the shear links. The semi-analytical model has been then used to assess the influence of the correct modeling of shear links on the collapse behaviour of EBF seismic structures and to evaluate the influence of the ultimate plastic rotation on collapse. To this aim, two multistory buildings, equipped respectively with vertical and horizontal dissipative shear links have been firstly designed according to the actual European Standards (EN 1998-1:2005 2005) optimizing their global dissipative behaviour until the collapse and then analyzed through Incremental Dynamic Analyses (IDA) modeling the shear links both with a classical approach and with the proposed semi-analytical model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
