EUROCODE-BASED SEISMIC ASSESSMENT OF FRAME STRUCTURE WITH NON-LINEAR DYNAMIC ANALYSIS

Abstract

Seismic assessment of frame structure with non-linear dynamic analysis Nonlinear analysis enables engineers to control various aspects of seismic behavior. Utilizing nonlinear analysis, engineers can directly determine inelastic deformations of elements (e.g. rotation), as well as deformations of the structure (inter-storey drift). In addition, nonlinear analysis can be used to check the bearing capacity of the elements that should remain in elastic region of deformations in order to prevent brittle failure. Subject of this paper is comparison of the results obtained from linear and non-linear seismic analysis of concrete frame structure designed and detailed according to principles of Eurocode 8 and capacity design method. Linear-elastic seismic analysis of multi-story frame structure was performed, with design and detailing of critical regions according to results and relevant requirements of Eurocode 8. Seismic analysis was performed for seismic zone which corresponds to PGA=0.36g (peak ground acceleration) according to EC8, and for ground type C. Assessment of structure performance during strong ground motions was performed with non-linear time history (dynamic) analysis using software PERFORM 3D (Nonlinear Analysis and Performance Assessment of 3D Structures). Non-linear dynamic analysis was performed for four groups of seven ground motion records that were chosen in order to comply with spectrum defined by Eurocode 8 for analyzed frame structure. Comparison of characteristic results is presented at the end of paper, with conclusions, recommendations and critical assessment of regulation.