Scaling of residual displacements in terms of elastic and inelastic spectral displacements for existing SDOF systems
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Structures undergoing inelastic displacements during earthquake ground motions are known to sustain some amount of residual displacements, which may make them unusable or unsafe. In this study an attempt is made to estimate residual displacements for elastic-perfectly-plastic single-degree-of-freedom oscillators with a given lateral strength ratio. It is observed in the case of a class of ground motions that there are no trends in the dependence of residual displacement on the temporal features of the ground motion, and thus any estimation of residual displacements should be carried out only in the statistical sense. Statistical estimation of residual displacement spectrum via normalization with respect to inelastic or elastic spectral displacements is considered, and it is found that normalization with respect to inelastic spectral displacements is preferable. Expressions for residual displacement spectra are proposed for both types of normalizations and for the given-lateral-strength-ratio type oscillators.
Keywordsresidual displacement spectrum lateral strength ratio elastic-perfectly-plastic oscillator inelastic displacement spectrum elastic displacement spectrum horizontal ground motions
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- Christopoulos C, Pampanin S and Priestley MJN (2003), “Performance-Based Seismic Response of Frame Structures Including Residual Deformations— Part I: Single-Degree-of-Freedom Systems,” Journal of Earthquake Engineering, 7(1): 97–118.Google Scholar
- Harikrishnan MG (2009), “Estimation of Residual Displacement for Horizontal Ground Motions,” MTech Thesis, Department of Civil Engineering, IIT Kanpur, Kanpur, India.Google Scholar
- Kumari R and Gupta VK (2007), “A Modal Combination Rule for Peak Floor Accelerations in Multistoried Buildings,” ISET Journal of Earthquake Technology, 44(1): 213–231.Google Scholar
- Lee VW and Trifunac MD (1987), “Strong Earthquake Ground Motion Data in EQUINFOS: Part 1,” Report CE 87-01, Department of Civil Engineering, University of Southern California, Los Angeles.Google Scholar
- Mahin SA and Bertero VV (1981), “An Evaluation of Inelastic Seismic Design Spectra,” Journal of the Structural Division, ASCE Proceedings, 107(ST9): 1777–1795.Google Scholar
- Mukherjee S and Gupta VK (2002), “Wavelet-Based Generation of Spectrum-Compatible Time-Histories,” Soil Dynamics and Earthquake Engineering, 22(12): 817–822.Google Scholar
- USNRC (1973), “Design Response Spectra for Seismic Design of Nuclear Power Plants,” Regulatory Guide 1.60, United States Nuclear Regulatory Commission, Washington.Google Scholar