scholarly journals Damping reduction equation for the equivalent linear analysis of seismic isolated structures subjected to near fault ground motions

2020 ◽  
Vol 220 ◽  
pp. 110834
Author(s):  
Murat Dicleli ◽  
Emrah Kara
Keyword(s):  
Ground Motions ◽  
Linear Analysis ◽  
Near Fault ◽  
Equivalent Linear ◽  
Reduction Equation ◽  
Isolated Structures ◽  
Equivalent Linear Analysis

Consideration of Three Seismic Isolation Performances as Design Objectives for Equivalent Linear Analysis of Bilinear Hysteretic Isolation Systems

2021 ◽  
pp. 2250001
Author(s):  
Shiang-Jung Wang ◽  
Yin-Nan Huang ◽  
Hsueh-Wen Lee ◽  
Yu-Wen Chang
Keyword(s):  
Seismic Isolation ◽  
Ground Motions ◽  
Linear Analysis ◽  
Analysis Procedure ◽  
Numerical Comparison ◽  
Near Fault ◽  
Equivalent Linear ◽  
Isolation Systems ◽  
Seismic Isolation Systems ◽  
Equivalent Linear Analysis

The design displacement, its corresponding acceleration performance, and the re-centering performance of bilinear hysteretic isolation systems are adopted as previously determined design objectives for equivalent linear analysis. To demonstrate the applicability and generalization of the analysis procedure, two sets of values for damping modification factors are employed in the analysis: those provided by ASCE/SEI 7-16, and those estimated for different ranges of the ratios of effective periods of seismic isolation systems to pulse periods of ground motions. To investigate a broad range of seismic responses of base-isolated structures, 15 pulse-like near-fault ground motions are used for numerical demonstration. The analysis procedure is numerically verified to be practically feasible. A numerical comparison also shows that the three design objectives previously determined in the analysis procedure are sufficiently conservative compared with analysis results from nonlinear dynamic response history, even when subjected to pulse-like near-fault ground motions. Regarding the approximation to maximum inelastic acceleration and displacement responses, it is particularly more conservative for the former when the design displacement is greater and when adopting values of the damping modification factors provided in ASCE/SEI 7-16. For the approximation to dynamic residual displacement responses, the influences of pulse-like near-fault ground motions and different design objectives on the re-centering performance of bilinear hysteretic isolation systems still need further study.

Improved Effective Damping Equation for Equivalent Linear Analysis of Seismic-Isolated Bridges

2006 ◽  
Vol 22 (1) ◽  
pp. 29-46 ◽  
Author(s):  
Murat Dicleli ◽  
Srikanth Buddaram
Keyword(s):  
Ground Motion ◽  
Nonlinear Response ◽  
Ground Motions ◽  
Linear Analysis ◽  
Frequency Characteristics ◽  
Accurate Estimation ◽  
Effective Period ◽  
Equivalent Linear ◽  
Isolated Bridges ◽  
Equivalent Linear Analysis

In this study, an improved effective damping (ED) equation is proposed to obtain more reasonable estimates of the actual nonlinear response of seismic-isolated bridges (SIB) using equivalent linear (EL) analysis procedure. For this purpose, first the EL analysis results using AASHTO's ED equation is evaluated using harmonic and seismic ground motions. The effect of several parameters such as substructure stiffness, isolator properties, and the intensity and frequency characteristics of the ground motion are considered in the evaluation. Next, the effect of the superstructure mass on the ED ratio is studied. It is found that the accuracy of the EL analysis results is affected by the frequency characteristics and intensity of the ground motion. It is also demonstrated that AASHTO's ED equation should incorporate the effective period of the SIB and isolator properties for a more accurate estimation of the seismic response quantities. A new ED equation that includes such parameters is formulated and found to improve the accuracy of the EL analysis.

scholarly journals Evaluation on the Soil Flexibility of the Largest HEP Dam Area in East Malaysia using 1-D Equivalent Linear Analysis

2021 ◽  
Vol 11 (4) ◽  
pp. 1535
Author(s):  
Raudhah Ahmadi ◽  
Muhammad Haniz Azahari Muhamad Suhaili ◽  
Imtiyaz Akbar Najar ◽  
Muhammad Azmi Ladi ◽  
Nisa Aqila Bakie ◽  
...  
Keyword(s):  
Linear Analysis ◽  
Equivalent Linear ◽  
East Malaysia ◽  
Soil Flexibility ◽  
Equivalent Linear Analysis
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