Residual drift demands in moment-resisting steel frames subjected to narrow-band earthquake ground motions

2013 ◽  
Vol 42 (11) ◽  
pp. 1583-1598 ◽  
Author(s):  
Edén Bojórquez ◽  
Jorge Ruiz-García
2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Edén Bojórquez ◽  
Arturo López-Barraza ◽  
Alfredo Reyes-Salazar ◽  
Sonia E. Ruiz ◽  
Jorge Ruiz-García ◽  
...  

In this paper, various moment-resisting steel frames (MRSFs) are subjected to 30 narrow-band motions scaled at different ground motion intensity levels in terms of spectral acceleration at first mode of vibration SaT1 in order to perform incremental dynamic analysis for peak and residual interstory drift demands. The results are used to compute the structural reliability of the steel frames by means of hazard curves for peak and residual drifts. It is observed that the structures exceed the threshold residual drift of 0.5%, which is perceptible to human occupants, and it could lead to human discomfort according to recent investigations. For this reason, posttensioned connections (PTCs) are incorporated into the steel frames in order to improve the structural reliability. The results suggest that the annual rate of exceedance of peak and residual interstory drift demands are reduced with the use of PTC. Thus, the structural reliability of the steel frames with PTC is superior to that of the MRSFs. In particular, the residual drift demands tend to be smaller when PTCs are incorporated in the steel structures.


2014 ◽  
Vol 595 ◽  
pp. 137-142 ◽  
Author(s):  
Edén Bojórquez ◽  
Alfredo Reyes-Salazar ◽  
Sonia E. Ruiz

In this study, various alternative vector-valued ground motion intensity measures (IMs) are used to estimate maximum inter-story drifts and hysteretic energy demands of steel framed buildings under long duration narrow-band ground motions. The vectors are based on the spectral acceleration at first mode of the structure as first parameterSa (T1). As the second parameter of the vector,IMsrelated to peak, integral and spectral shape parameters are selected. It is concluded that spectral-shape-based vector-valuedIMshave the best relation with maximum inter-story drift and energy demands in steel frames subjected to narrow-band earthquake ground motions.


2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Arturo López-Barraza ◽  
Edén Bojórquez ◽  
Sonia E. Ruiz ◽  
Alfredo Reyes-Salazar

The aim of this paper is to study the seismic performance of self-centering moment-resisting steel frames with posttensioned connections taking into account nonlinear material behavior, for better understanding of the advantages of this type of structural system. Further, the seismic performance of traditional structures with rigid connections is compared with the corresponding equivalent posttensioned structures with semirigid connections. Nonlinear time history analyses are developed for both types of structural systems to obtain the maximum and the residual interstory drifts. Thirty long-duration narrow-banded earthquake ground motions recorded on soft soil sites of Mexico City are used for the analyses. It is concluded that the structural response of steel buildings with posttensioned connections subjected to intense earthquake ground motions is reduced compared with the seismic response of traditional buildings with welded connections. Moreover, residual interstory drift demands are considerably reduced for the system with posttensioned connections, which is important to avoid the demolition of the buildings after an earthquake.


2001 ◽  
Vol 17 (4) ◽  
pp. 657-677 ◽  
Author(s):  
Mário S. Lopes ◽  
Rita Bento

In order that moment-resisting frames exhibit adequate ductile behavior under seismic actions, it is necessary that inelastic deformations spread throughout the height of the frames. It is widely accepted that this is only possible if vertical members remain essentially elastic, such as enforced in the most advanced codes of practice. The results of nonlinear dynamic analysis shown in this work demonstrate that this is not the case if frames resist earthquake ground motions together with structural walls. This was attributed to the fact that these elements prevent the development of sidesway mechanisms even if plastic hinges form at all column extremities at a given floor. As a consequence, it is proposed to relax the capacity design procedures for design of ductile frames that resist earthquake ground motions together with structural walls.


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