scholarly journals Inelastic Displacement Ratio Spectrum for Near-Fault Ground Motions

2013 ◽  
pp. 694-697 ◽  
Author(s):  
Gaylord Kabongo-Booto ◽  
George D. Hatzigeorgiou
Keyword(s):  
Ground Motions ◽  
Inelastic Displacement ◽  
Ratio Spectrum ◽  
Near Fault ◽  
Displacement Ratio ◽  
Inelastic Displacement Ratio

Approximate Method for Predicting Inelastic Displacement of SDF Systems

2008 ◽  
Vol 385-387 ◽  
pp. 437-440
Author(s):  
Mun Su Bae ◽  
Jong Bo Kim ◽  
Sang Whan Han
Keyword(s):  
Ground Motions ◽  
Peak Displacement ◽  
Inelastic Displacement ◽  
Long Period ◽  
Displacement Ratio ◽  
Significant Difference ◽  
Statistical Studies ◽  
Inelastic Displacement Ratio ◽  
Site Classes ◽  
Stiff Soil

The objective of this study is to develop inelastic displacement ratio for calculating peak inelastic displacement of SDF systems. The inelastic displacement ratio is defined as the ratio of peak displacement of inelastic SDF system to the peak displacement of corresponding elastic SDF system. Statistical studies are carried out to estimate median inelastic displacement ratios and those dispersion of bilinear SDF systems with given yield-strength reduction factors, natural periods, post-yield stiffness ratios and damping ratios ranging from 1 to 20% when subjected to 60 earthquake ground motions recorded on stiff soil sites. This study shows that equal displacement rule overestimates the peak inelastic displacement of the system which has a fundamental period ranging from the intermediate to long period. It is also observed that no significant difference was observed in the value of median inelastic displacement ratio across site classes.

scholarly journals Inelastic displacement ratios for non-structural components in steel framed structures under forward-directivity near-fault strong-ground motion

2021 ◽  
Author(s):  
M. A. Bravo-Haro ◽  
J. R. Virreira ◽  
A. Y. Elghazouli
Keyword(s):  
Strong Ground Motion ◽  
Ground Motions ◽  
Structural Elements ◽  
Structural Components ◽  
Framed Structures ◽  
Inelastic Displacement ◽  
Near Fault ◽  
Forward Directivity ◽  
The Mean ◽  
Strong Ground

AbstractThis paper describes a detailed numerical investigation into the inelastic displacement ratios of non-structural components mounted within multi-storey steel framed buildings and subjected to ground motions with forward-directivity features which are typical of near-fault events. The study is carried out using detailed multi-degree-of-freedom models of 54 primary steel buildings with different structural characteristics. In conjunction with this, 80 secondary non-structural elements are modelled as single-degree-of-freedom systems and placed at every floor within the primary framed structures, then subsequently analysed through extensive dynamic analysis. The influence of ground motions with forward-directivity effects on the mean response of the inelastic displacement ratios of non-structural components are compared to the results obtained from a reference set of strong-ground motion records representing far-field events. It is shown that the mean demand under near-fault records can be over twice as large as that due to far-fault counterparts, particularly for non-structural components with periods of vibration lower than the fundamental period of the primary building. Based on the results, a prediction model for estimating the inelastic displacement ratios of non-structural components is calibrated for far-field records and near-fault records with directivity features. The model is valid for a wide range of secondary non-structural periods and primary building fundamental periods, as well as for various levels of inelasticity induced within the secondary non-structural elements.

Inelastic Displacement Spectra and Its Utilization of DDB Design for Seismic Isolated Bridges Subjected to Near-Fault Pulse-Like Ground Motions

2019 ◽  
Vol 35 (3) ◽  
pp. 1109-1140 ◽  
Author(s):  
Yi-feng Wu ◽  
Hao Wang ◽  
Jian Li ◽  
Ben Sha ◽  
Ai-qun Li
Keyword(s):  
Design Method ◽  
Ground Motions ◽  
Single Degree Of Freedom ◽  
Sdof System ◽  
Inelastic Displacement ◽  
Displacement Spectra ◽  
Near Fault ◽  
The Mean ◽  
Displacement Based ◽  
Isolated Bridges

A variety of research has focused on the inelastic displacement demand of a single degree of freedom (SDOF) system when subjected to near-fault pulse-like ground motions, in which the concerned ductility, μ, is typically lower than ten for normal structures. However, for seismic isolated structures that are more prone to large displacement, the corresponding research is limited. The purpose of this paper is to investigate the inelastic displacement spectra of an SDOF system with μ ranging from 5 to 70 and further proposes a direct displacement-based (DDB) design method for seismic isolated bridges. More concretely, a pool of near-fault pulse-like records is assembled, the mean C μ as a function of T/ T p is developed, and the influences of the ductility, μ, and the post-to-pre-yield ratio, α, on C μ are carefully investigated. Then the corresponding inelastic displacement spectra, S d, are obtained, and a comprehensive piecewise expression is proposed to fit S d. After that, the utilization of the spectra for the DDB design of a three-span seismic isolated continuous bridge is performed, and the principal of simplifying the bridge to an SDOF system is carefully explained and verified.

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