Abstract
Nonlinear static analysis is a validated tool for the seismic evaluation of existing and new structures, specifically for reinforced concrete buildings. In order to assess the performance of reinforced concrete frames designed according to the new Venezuelan seismic code, configurations of low-, medium-, and high-rise concrete buildings are subjected to 20 different load patterns considering the nonlinear behavior according to FEMA P695. A total of 140 concrete frame models were analyzed using modal response spectrum analysis and nonlinear static pushover analysis. The parameters considered for analyzing the models were the response reduction factor (R), the overstrength factor (RΩ), and the ductility factor (Rµ). The results showed a performance controlled by ductile failure mechanisms in low-rise models unlike combined failure mechanisms with columns with plastic hinge in high-rise models. Reduction factor values between 4 and 14 were obtained. In addition, the pushover curves were affected by the load patterns; therefore, it was necessary to identify the representative patterns, refusing the rest of the patterns. A statistical adjustment was performed using a log-normal distribution. The strength reduction factor specified in the new Venezuelan code was higher than the values obtained for the 95% confidence levels according to the distribution assumed in the reinforced concrete frames models. Finally, the strength reduction factor more representative is R = 4.
Highlights
The static pushover analysis is a validated tool for the seismic evaluation of existing and new structures
The nonlinear response can be estimated from pushover analysis, referred to as nonlinear static analysis
The structure is subjected to incremental lateral loads, and the nonlinear behavior is obtained from the analysis by updating the stiffness matrix at each load increment [2]
Summary
The static pushover analysis is a validated tool for the seismic evaluation of existing and new structures. The nonlinear static analysis (pushover) method was used in the seismic assessment of reinforced concrete frames designed according to the new Venezuelan code COVENIN 1756-1 [19] to quantify the response reduction factor (R), the overstrength factor (RΩ), and the ductility factor (Rμ). These factors were compared with similar factors established in the Venezuelan code [19].
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