SEISMIC PERFORMANCE OF MULTISTOREY FRAMES WITH BOLTED EXTENDED END-PLATE JOINTS: THE INFLUENCE OF JOINT MODELLING ASSUMPTIONS

摘要

The strength and the stiffness of bolted extended end plate beam-to-column joints generally affect the overall seismic response of steel multi-storey frames. Therefore, it is necessary to account for the joint mechanical behaviour in numerical analyses devoted to assess the seismic performance. In this paper some modelling assumptions are proposed and validated against experimental results to develop refined models accounting for the moment-rotation response of bolted end-plate moment resisting joints. To this aim, different configurations of bolted endplate connections have been modelled by varying both stiffness and strength properties. In order to highlight the accuracy of the proposed strategy, the numerical results obtained by refined modelling hypotheses have been compared with those given by using simplified assumptions.