Evaluation of the ductility demand in partial strength steel structures in seismic areas using static pushover

摘要

The seismic assessment of three steel structures is performed by means of non-linear static analyses and some conclusions could be reached: 1. It is observed a good agreement between the nonlinear static and dynamic analyses, in particular in terms of the horizontal displacements and inter-storey drifts results; 2. The first structure studied (E-2x4-2D) needs to be redesign or retrofitted. 3. The other two structures, E-5x2-2D and E-4x5x8-3D, exhibit overstrength, considering the horizontal displacements values and the maximum rotation values at the connections; 4. The model to simulate the hysteretic connection behaviour for the non-linear dynamic analysis presents good results; 5. The N2 method seems to be a conservative design procedure, when compared with the dynamic analysis. As a conclusion it can be ascertained that the non-linear static procedures are an alternative tool in seismic assessment and design, over just a force-based design. For structures that vibrate mainly in the fundamental mode, the pushover analysis applied in this work will provide good estimates of global, as well as local inelastic deformation demands.