Seismic response of steel frames under repeated earthquake ground motions

2004 ◽  
Vol 26 (13) ◽  
pp. 2021-2035 ◽  
Author(s):  
M. Fragiacomo ◽  
C. Amadio ◽  
L. Macorini
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Steel Frames ◽  
Earthquake Ground Motions ◽  
Repeated Earthquake

Power Analysis of Sdof Structures with Tuned Inerter Dampers Subjected to Earthquake Ground Motions

2020 ◽  
Author(s):  
Wenai Shen ◽  
Zhentao Long ◽  
Heng Wang ◽  
Hongping Zhu
Keyword(s):  
Seismic Response ◽  
Output Power ◽  
Analytical Solutions ◽  
Ground Motions ◽  
Soft Soil ◽  
Response Control ◽  
Seismic Response Control ◽  
Earthquake Ground Motions ◽  
Short Period ◽  
Soil Site

Abstract Tuned inerter dampers (TID) have been demonstrated as efficient energy dissipation devices for seismic response control. However, its potential capability for energy harvesting remains largely unexplored. Here, we present a theoretical analysis of the power of a structure-TID system subjected to earthquake ground motions. The analytical solutions of the average damping power of the system are derived for considering white noise base excitations and the Kanai-Tajimi earthquake model, respectively. Comparisons of the numerical results of a Monte Carlo simulation and the theoretical predictions verify the accuracy of the analytical solutions. Besides, we uncover the influence of the TID parameters on the damping power and output power of the system. The optimal frequency ratio of the TID for maximizing its output power slightly differs from that for seismic response control, and the former varies with site conditions. In contrast, both the damping power and output power are not sensitive to the damping ratio of the TID. For short-period structures, a small inertance-to-mass ratio (µ) of the TID is beneficial to maximize its output power, while seismic response control requires a large µ. For long-period structures, the damping power and output power are not sensitive to the µ. Generally, a structure-TID system on a soft soil site absorbs more energy from a given earthquake and is capable of harvesting more energy than that on a hard soil site. This study may help develop new strategies for self-powered control and monitoring in civil structures.

Temperature Rise Effect of Viscoelastically Damped Structures Under Strong Earthquake Ground Motions

1998 ◽  
Vol 14 (3) ◽  
pp. 125-135 ◽  
Author(s):  
K. C. Chang ◽  
M. H. Tsai ◽  
Y. H. Chang ◽  
M. L. Lai
Keyword(s):  
Energy Dissipation ◽  
Frequency Domain ◽  
Seismic Response ◽  
Time Domain ◽  
Temperature Rise ◽  
Strong Earthquake ◽  
Ground Motions ◽  
Domain Analysis ◽  
Effect Of Temperature ◽  
Earthquake Ground Motions

ABSTRACTViscoelastic (VE) dampers have been shown to be an effective energy dissipation device for structures subjected to seismic excitations. When a VE damper is under shear deformation, the temperature within the damper material will rise due to the conversion of mechanical energy into heat. The effect of temperature rise in the VE damper on a viscoelastically damped structure may be significant because the damper stiffness can decrease due to the temperature rise in the VE damper and its energy dissipation capacity may reduce under strong earthquake ground motions. This paper is intended to quantify the temperature rise effect. A VE element which can accurately describe the frequency and temperature dependent behavior of the test results of a VE damper is first presented. The effect of temperature rise within the VE material is included. Seismic response analyses of a viscoelastically damped structure which was studied extensively by shaking table tests are carried out by two analytical methods: a frequency domain analysis and a time domain analysis. Both analyses consider the effects of frequency and ambient temperature of the VE dampers. The frequency domain approach is computationally more efficient. However, it neglects the effect of temperature rise in the analysis. The time domain method is computationally less efficient. However, it can explicitly calculate the temperature rise during the earthquake and evaluate its influence on the structural responses. Finally, parametric studies on the effect of temperature rise within the VE damper material on the seismic response of a viscoelastically damped structure are analyzed and its implications on practical applications are discussed.

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.

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