The collapse margin ratio of steel frames considering the vertical component of earthquake ground motions

2022 ◽  
Vol 188 ◽  
pp. 107054
Author(s):  
Mohammadjavad Hamidia ◽  
Nima Shokrollahi ◽  
Reza Rasti Ardakani
Keyword(s):  
Ground Motions ◽  
Steel Frames ◽  
Vertical Component ◽  
Earthquake Ground Motions ◽  
Collapse Margin Ratio

scholarly journals Reduction of Maximum and Residual Drifts on Posttensioned Steel Frames with Semirigid Connections

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Arturo López-Barraza ◽  
Edén Bojórquez ◽  
Sonia E. Ruiz ◽  
Alfredo Reyes-Salazar
Keyword(s):  
Seismic Performance ◽  
Ground Motions ◽  
Soft Soil ◽  
Steel Frames ◽  
Time History ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Steel Buildings ◽  
Earthquake Ground Motions ◽  
Semirigid Connections

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.

Directivity in NGA Earthquake Ground Motions: Analysis Using Isochrone Theory

2008 ◽  
Vol 24 (1) ◽  
pp. 279-298 ◽  
Author(s):  
Paul Spudich ◽  
Brian S. J. Chiou
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Strike Slip ◽  
Motion Prediction ◽  
Spectral Acceleration ◽  
Correction Factors ◽  
Ground Motion Prediction ◽  
Earthquake Ground Motions

We present correction factors that may be applied to the ground motion prediction relations of Abrahamson and Silva, Boore and Atkinson, Campbell and Bozorgnia, and Chiou and Youngs (all in this volume) to model the azimuthally varying distribution of the GMRotI50 component of ground motion (commonly called “directivity”) around earthquakes. Our correction factors may be used for planar or nonplanar faults having any dip or slip rake (faulting mechanism). Our correction factors predict directivity-induced variations of spectral acceleration that are roughly half of the strike-slip variations predicted by Somerville et. al. (1997), and use of our factors reduces record-to-record sigma by about 2–20% at 5 sec or greater period.

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