How Different Scaling and Matching Approaches Affect the Base Shear?

Anas Al Johmani

Muğla Sıtkı Koçman University

https://orcid.org/0000-0002-7641-8572

Ebru Harmandar

Muğla Sıtkı Koçman University

https://orcid.org/0000-0001-9802-2993

DOI: https://doi.org/10.56038/oprd.v5i1.526

Keywords: Scaling methods, time history analysis, ASCE 7-16, einforced concrete structures


Abstract

Proper selecting and scaling of earthquake data are very important to obtain an accurate input which is compatible with the target spectrum for the dynamic analysis of the structures. In this study, six sets of earthquake data were selected where each set contained 11 earthquakes. Magnitude, site conditions, fault mechanisms as well as the distance from the faults are considered as the selection criteria. Then, the selected earthquake data were scaled in three different methods, mainly, time domain scaling, spectral matching in frequency domain and spectral matching in time domain. The scaled data was used to perform the time history analysis on a 5-storey and 11 storey reinforced concrete buildings located in Turkey. At the end, the results are compared with respect to the engineering demand parameter (base shear). As expected, the results are affected with respect to fault mechanism and distance. The highest predicted lateral force on the base of the system due to seismic loads is calculated based on the method, spectral matching in frequency domain.


References

Katsanos EI, Sextos AG, Manolis GD: Selection of earthquake ground motion records: A state-of-the-art review from a structural engineering perspective. Soil Dyn Earthq Eng. 2010; 30(4): 157–169. DOI: https://doi.org/10.1016/j.soildyn.2009.10.005

Bommer JJ, Acevedo AB: The use of real earthquake accelerograms as input to dynamic analysis. J Earthq Eng. 2004; 43–91. DOI: https://doi.org/10.1080/13632460409350521

Al Atik L, Abrahamson N: An improved method for nonstationary spectral matching. Earthq Spectra. 2010; 26(3): 601–617. DOI: https://doi.org/10.1193/1.3459159

Fahjan YM: Selection and scaling of real earthquake accelerograms to fit the Turkish design spectra. Teknik Dergi/Technical J Turkish Chamb Civ Eng. 19(SPEC. ISS.); 2008; 1231–1250.

Özdemir Z, Fahjan YM: Comparison of time and frequency domain scaling of real accelerograms to match earthquake design spectra. In: Sixth Natl Conf Earthq Eng; 2007; 435: 446.

Huang YN, Whittaker AS, Luco N, Hamburger RO: Scaling earthquake ground motions for performance-based assessment of buildings. J Structural Eng. 2011; 137(3): 311–321. DOI: https://doi.org/10.1061/(ASCE)ST.1943-541X.0000155

Samadzad M, Esmaili O, Epackachi S, Mirghaderi R: Effects of time-domain ground motion scaling method on nonlinear response of tall shear walls and RC structures. In: Ninth Canadian Conference on Engineering; 2007 26-29 June; Ottawa, Ontario, Canada.

Graves RW, Pitarka A, Somerville PG: Ground-motion amplification in the Santa Monica area: Effects of shallow basin-edge structure. Bull Seism Soc Am. 1998; 88 (5): 1224–1242.

Doi: https://doi.org/10.1785/BSSA0880051224. DOI: https://doi.org/10.1785/BSSA0880051224

Kaul MK: Spectrum-consistent time-history generation. J Eng Mechanics Division. 1978; 104(4): 781-788. DOI: https://doi.org/10.1061/JMCEA3.0002379

Lilhanand K, Tseng WS: Generation of synthetic time histories compatible with multiple-damping design response spectra. In: Transactions of the 9th international conference on structural mechanics in reactor technology. 1987, K1.

Abrahamson NA: Non-stationary spectral matching. Seismological Res Letters. 1992; 63.1: 30.