Maximum seismic displacement assessment of composite steel-concrete structures from residual deformations

Abstract

This study examines the inelastic seismic behavior of composite steel-concrete structures, with a particular emphasis on the correlation between maximum and residual displacements. Firstly, 32 regular composite plane frames are designed, which include a range of structural configurations from 3 to 24 stories. The frames are constructed following Eurocodes and feature concrete-filled steel tube columns along with composite beams. A detailed databank is established by subjecting these frames to a variety of strong seismic records at different scale factors, capturing both maximum and permanent displacements of the upper story and including soil-structure interaction phenomena. Through a statistical analysis of this extensive dataset, an empirical relationship between permanent and maximum displacements is derived. This relationship serves as a significant resource for post-earthquake evaluations of composite structures, facilitating the estimation of maximum seismic displacements based on observable residual deformations. The results enhance the comprehension of the inelastic response of composite structures and contribute to the refinement of seismic performance assessments.