Investigation of forward directivity effects on design spectra of industrial complexes near Assaluyeh fault
الموضوعات :
Ali Raoof Mehrpoor
1
(Department of Civil Engineering, Qazvin Branch, Islamic Azad University)
Masoud N. Ahari
2
(National Iranian Petrochemical Company)
الکلمات المفتاحية: Forward directivity, Design Spectrum, Near fault,
ملخص المقالة :
Recorded ground motions in near fault region have completely distinct nature from others that recorded in far field of the fault. Near source outcomes cause much of the seismic energy to appear in a single large and long period pulse at the beginning of the velocity record. Assaluyeh complex is located near the reverse Assaluyeh fault that is a segment of Mountain Front Fault. This complex contains facilities which have a wide range of structural periods. Effects of this vicinity on seismic hazard of this region can be considered by using approaches which incorporate effects of near fault in seismic hazard analysis. It can be achieved by using near source specific ground motion models in probabilistic seismic hazard analysis and using accelerograms which contain the pulse-like effects of forward directivity. The results indicate that the site-specific design spectra ofthis study fall at an upper level in comparison with the standard design spectra of Iranian 2800 standard and the specific design spectrum of International Institute of Earthquake Engineering and Seismology (IIEES). It is worth noting that near fault effects should be considered in probabilistic seismic hazard analysis and preparation of site specific design spectra if the site is located near source region of a fault.
[1]. Somerville, P. (1997, May). Engineering characteristics of near fault ground motion. In SMIP97 Seminar on Utilization of Strong-Motion Data (Vol. 8).
[2]. Bray, J. D., & Rodriguez-Marek, A. (2004). Characterization of forward-directivity ground motions in the near-fault region. Soil Dynamics and Earthquake Engineering, 24(11), 815-828.
[3]. Somerville, P. G. (1998, September). Development of an improved representation of near fault ground motions. In SMIP98 Seminar on Utilization of Strong-Motion Data (Vol. 15).
[4]. Seismic hazard and geotechnical studies of Assaluyeh region. 1st volume. August 2001.Tectonic and seismotectonic evolutions. International Institute of Seismology and Earthquake Engineering.
[5]. Berberian, M. (1981). Active faulting and tectonics of Iran. Geodynamics Series, 3, 33-69.
[6]. Berberian, M. (1995). Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. Tectonophysics, 241(3), 193-224.
[8]. Abrahamson, N. A. (2000, November). Effects of rupture directivity on probabilistic seismic hazard analysis. In Proceedings of the 6th International Conference on Seismic Zonation (Vol. 1, pp. 151-156). CA: Palm Springs.
[9]. Tothong, P., Cornell, C. A., & Baker, J. W. (2007). Explicit directivity-pulse inclusion in probabilistic seismic hazard analysis. Earthquake Spectra, 23(4), 867-891.
[10]. Shahi, S. K., & Baker, J. W. (2011). An empirically calibrated framework for including the effects of near-fault directivity in probabilistic seismic hazard analysis. Bulletin of the Seismological Society of America, 101(2), 742-755.
[11]. Campbell, K. W., & Bozorgnia, Y. (2003). Updated near-source ground-motion (attenuation) relations for the horizontal and vertical components of peak ground acceleration and acceleration response spectra. Bulletin of the Seismological Society of America, 93(1), 314-331.
[12]. Ambraseys, N. N., & Douglas, J. (2003). Near-field horizontal and vertical earthquake ground motions. Soil dynamics and earthquake engineering, 23(1), 1-18.
[13]. Campbell, K. W. (1997). Empirical near-source attenuation relationships for horizontal and vertical components of peak ground acceleration, peak ground velocity, and pseudo-absolute acceleration response spectra. Seismological Research Letters, 68(1), 154-179.
[14]. Chiou, B. S. J. (2006). Chiou and Youngs PEER-NGA empirical ground motion model for the average horizontal component of peak acceleration and pseudo-spectral acceleration for spectral periods of 0/01 to 10 seconds. Interim Report Issued for USGS Review.
[15]. Campbell, K. W., & Bozorgnia, Y. (2008). NGA ground motion model for the geometric mean horizontal component of PGA, PGV, PGD and 5% damped linear elastic response spectra for periods ranging from 0/01 to 10 s. Earthquake Spectra, 24(1), 139-171.
[16]. Ghasemi, H., Zare, M., Fukushima, Y., & Koketsu, K. (2009). An empirical spectral ground-motion model for Iran. Journal of seismology, 13(4), 499-515.
[17]. Abrahamson, N. A., & Somerville, P. G. (1996). Effects of the hanging wall and footwall on ground motions recorded during the Northridge earthquake. Bulletin of the Seismological Society of America, 86(1B), S93-S99.
[18].Mouthereau, F., Lacombe, O., & Vergés, J. (2012). Building the Zagros collisional orogen: timing, strain distribution and the dynamics of Arabia/Eurasia plate convergence. Tectonophysics, 532, 27-60.
[19]. Baker, J. W. (2008). An introduction to probabilistic seismic hazard analysis (PSHA). White paper, version, 1, 72.
[20]. Kijko, A., & Sellevoll, M. A. (1992). Estimation of earthquake hazard parameters from incomplete data files. Part II. Incorporation of magnitude heterogeneity. Bulletin of the Seismological Society of America, 82(1), 120-134.
[21]. Seismic hazard and geotechnical studies in Assaluyeh region. 3rd volume. Sep. 2001. Seismicity and seismic response of ground surface evolutions. International Institute of Seismology and Earthquake Engineering.
[22]. Iranian Code of Practice for Seismic resistant Design of Buildings. Standard No 2800, 3rd Edition. Permanent Committee for Revising the Iranian Code of Practice for Seismic Resistant Design of Buildings.
[23]. Code, U. B. (1997). UBC-97. American Association of Building Officials, Whittier, CA.
[24].Soils and foundation investigation proposed ABS & Rubbers plants of Jam petrochemical complex in Assaluyeh, Zamiran Consulting Engineers, 06 November 2010, Tehran
