Blast and Impact Loading and Response of Structures
Full Session with Abstracts
Pushover analysis is a widely accepted methodology for evaluating the seismic resistance of new and existing structures and has been implemented in European and American design standards such as Eurocode 8 and ASCE-41. The application of pushover analysis falls within the performance-based design framework and aims to limit the earthquake-induced damage to a structure to an acceptable damage level depending on the importance of a structure. One advantageous outcome from this approach is that the level of damage in a structure after a specific earthquake is, in theory, known. Therefore, damage of individual members that have lost portion or their full load carrying capacity is known.
The proposed methodology uses the damaged structure for a subsequent analysis to evaluate its post-earthquake condition using principles of alternative load path method used in disproportionate collapse analysis. A first step for the subsequent analysis is to identify and assess the heavily damaged members from the analysis, taking into consideration the contribution of normally neglected large-deformation mechanisms. These mechanisms include the contribution of secondary gravity load-bearing mechanisms such as compression membrane, tension membrane, and deep beam action of walls. A second step is to estimate the collapse resistance of the damaged structure using advanced analysis tools that are able to capture the contribution of large-deformation mechanisms. In the proposed framework, the ultimate collapse resistance of the damaged structure will be assessed with performance-based criteria that depend on the importance of the structure and the occupancy of the building.