Rapid growth of performance-based earthquake engineering has caused increasing interest in Nonlinear Time History Analysis (NLTHA) as an effective tool for the estimation of dynamic structural demand and capacity. Considering the preparation of a set of ground motions as the key step for NLTHA; many ground motion selection and modification approaches have been proposed to ensure reliable analysis results by reducing possible bias due to the random selection of ground motions. Apart from the existing differences among these methods, there is a common aspect in almost all of them, which can be considered as a limitation: They are constructed on the basis of simplifying assumptions that are not necessarily valid for irregular or complex structural systems. This paper evaluates the efficiency of a recently proposed structure-specific record selection scheme in terms of collapse simulation of vertically irregular frames. Utilization of the method is assessed by case studies on which different strength, stiffness and combined irregularity patterns are applied. The influence of proposed reduction in the number of used records on the estimated collapse capacities is evaluated by statistical tools. The results confirm the ability of the method in estimating median collapse capacity with 82% reduction in computational cost and maximum observed error of 16%.
FEMA P695 (2009) Quantification of Building Seismic Performance Factors. Washington, DC.
Haselton, C.B. (2006) Assessing Seismic Collapse Safety of Modern Reinforced Concrete Moment Frame Buildings. Stanford University.
Reyes, J.C. and Kalkan, E. (2012) How many records should be used in an ASCE/SEI-7 ground motion scaling procedure? Earthquake Spectra, 28(3), 1223-1242.
Vamvatsikos, D. and Cornell, C.A. (2002) Incremental dynamic analysis. Earthq. Eng. Struct. Dyn., 31(3), 491-514.
Kayhani, H., Azarbakht, A., and Ghafory-Ashtiany, M. (2013) Estimating the annual probability of failure using improved progressive incremental dynamic analysis of structural systems. Struct. Des. Tall. Spec., 22(17), 1279-1295.
Lallemant, D., Kiremidjian, A., and Burton, H. (2015) Statistical procedures for developing earthquake damage fragility curves. Earthq. Eng. Struct. Dyn.
Baker, J.W. (2015) Efficient analytical fragility function fitting using dynamic structural analysis. Earthquake Spectra , 31(1), 579-599.
Ghafory-Ashtiany, M. and Arian Moghaddam, S. (2015) Strong ground motion record selection; approaches, challenges and prospects. 26th General Assembly of the International Union of Geodesy and Geophysics (IUGG), Prague, Czech, June 22-July 2.
Luco, N. and Cornell, C.A. (2007) Structurespecific scalar intensity measures for near-source and ordinary earthquake ground motions. Earthquake Spectra , 23(2), 357-392.
Mollaioli, F., Lucchini, A., Cheng, Y., and Monti, G. (2013) Intensity measures for the seismic response prediction of base-isolated buildings. Bull. Earthq. Eng., 11(5), 1841-1866.
Azarbakht, A., Dolsek, M. (2007) Prediction of the median IDA curve by employing a limited number of ground motion records. Earthq. Eng. Struct. Dyn., 36(15), 2401-2421.
Ghafory-Ashtiany, M., Mousavi, M., and Azarbakht, A. (2011) Strong ground motion record selection for the reliable prediction of the mean seismic collapse capacity of a structure group. Earthq. Eng. Struct. Dyn., 40(6), 691-708.
De Stefano, M. and Pintucchi, B. (2008) A review of research on seismic behaviour of irregular building structures since 2002. Bull. Earthq. Eng., 6(2), 285-308.
ASCE (2010) Minimum design loads for buildings and other structures. ASCE/SEI 7-10, Reston, VA.
Soni, D.P. and Mistry, B.B. (2006) Qualitative review of seismic response of vertically irregular building frames. ISET J. Earthq. Tech., 43(4), 121-132.
Valmundsson, E.V. and Nau, J.M. (1997) Seismic response of building frames with vertical structural irregularities. J. Struct. Eng., 123(1), 30-41.
Al-Ali, A.A. and Krawinkler, H. (1998) Effects of Vertical Irregularities on Seismic Behavior of Building Structures. John A. Blume Earthquake Engineering Center.
Chintanapakdee, C. and Chopra, A.K. (2004) Seismic response of vertically irregular frames: response history and modal pushover analyses. J. Struct. Eng., 130(8), 1177-1185.
Fragiadakis, M., Vamvatsikos, D., and Papadrakakis, M. (2006) Evaluation of the influence of vertical irregularities on the seismic performance of a nine-storey steel frame. Earthq. Eng. Struct. Dyn., 35(12), 1489-1509.
Sadashiva, V.K., MacRae, G.A., and Deam, B.L. (2012) Seismic response of structures with coupled vertical stiffness-strength irregularities. Earthq. Eng. Struct. Dyn., 41(1), 119-138.
Van Thuat, D. (2013) Story strength demands of irregular frame buildings under strong earthquakes. Struct. Des. Tall. Spec., 22(9), 687-699.
Varadharajan, S., Sehgal, V., and Saini, B. (2014) Seismic response of multistory reinforced concrete frame with vertical mass and stiffness irregularities. Struct. Des. Tall. Spec., 23(5), 362-389.
Karavasilis, T.L., Bazeos, N., and Beskos, D.E. (2008) Drift and ductility estimates in regular steel MRF subjected to ordinary ground motions: a design-oriented approach. Ear thquake Spectra , 24(2), 431-451.
Dimopoulos, A.I., Bazeos, N., and Beskos, D.E. (2012) Seismic yield displacements of plane moment resisting and x-braced steel frames. Soil. Dyn. Earthquake Engineering, 41, 128-140.
SeismoSoft, SeismoStruct. "A computer program for static and dynamic nonlinear analysis of framed structures." http://www.seismosoft.com (2006).
Krishnan, S. and Muto, M. (2012) Mechanism of collapse of tall steel moment-frame buildings under earthquake excitation. J. Struct. Eng. 27. Efron, B. and Tibshirani, R. (1993) An Introduction to the Bootstrap. Chapman & Hall: New York.
Chernick, M.R. (2011) Bootstrap Methods: A Guide for Practitioners and Researchers. Vol. 619. John Wiley & Sons: Hoboken, New Jersey.
Arian Moghaddam, S., & Ghafory-Ashtiany, M. (2015). Evaluation of a Recently Proposed Ground Motion Selection Method in Case of Vertically Irregular Frames. Journal of Seismology and Earthquake Engineering, 17(3), 165-180.
MLA
Salar Arian Moghaddam; Mohsen Ghafory-Ashtiany. "Evaluation of a Recently Proposed Ground Motion Selection Method in Case of Vertically Irregular Frames". Journal of Seismology and Earthquake Engineering, 17, 3, 2015, 165-180.
HARVARD
Arian Moghaddam, S., Ghafory-Ashtiany, M. (2015). 'Evaluation of a Recently Proposed Ground Motion Selection Method in Case of Vertically Irregular Frames', Journal of Seismology and Earthquake Engineering, 17(3), pp. 165-180.
VANCOUVER
Arian Moghaddam, S., Ghafory-Ashtiany, M. Evaluation of a Recently Proposed Ground Motion Selection Method in Case of Vertically Irregular Frames. Journal of Seismology and Earthquake Engineering, 2015; 17(3): 165-180.
)