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Volume Title: ICASGE2023

DOI: ICASGE-RCS

Ahmed Tarabia

Faculty of Engineering, Alexandria University, Egypt

In the present decade, more advanced seismic nonlinear analysis has become possible. ATC-40, FEMA-356, Eurocode, the N2 method, and FEMA-440 are popular performance-based seismic procedures. These procedures determine the performance level of the structure and the target displacement using the nonlinear static behavior of the structure and the damped response earthquake spectrum. The main objective of this study is to evaluate the performance of regular frames designed by the code equivalent static load method using several performance design methods. The studied regular RC frames are six, ten, and fourteen stories limited ductile concrete frames. The Seismostruct nonlinear finite element program was used to perform the pushover nonlinear static analysis. The maximum inelastic displacement and the performance level of the reinforced concrete buildings were determined for each performance method. In general, it was concluded that the equivalent static method is conservative, especially in tall frames, because it ignores the effect of higher modes and is dependent on the first mode. The results of this paper showed that the capacity spectrum method (ATC-40) gave the lowest target displacement in most cases, and the displacement coefficient method (FEMA-440) gave the highest target displacement. By assessing the performance level of frames designed by the code seismic method, an immediate occupancy performance level was obtained for frames subjected to 0.15 g. The expected performance level for frames subjected to 0.30 g was between immediate occupancy and life safety level.

Earthquake; pushover; Performance point; performance seismic procedure

Reinforced Concrete Structures (RCS)