Influence of Instantaneous Power Spectrum Matched Records on Inelastic Displacements of Single-Degree-of-Freedom Systems

Yıl 2022, Cilt: 22 Sayı: 1, 199 - 206, 28.02.2022

Esra Zengin

https://doi.org/10.35414/akufemubid.1025697

Öz

The use of Instantaneous Power (IP(T1)) together with elastic spectral acceleration at the first mode period of the structure (Sa(T1)) alleviates the need for explicit consideration of pulse characteristics of the near-fault records in seismic design and assessment of structures. A recently proposed record matching algorithm can simultaneously match the near-fault records to the target Sa- and IP- spectrum. This study evaluates the influence of consideration of IP in the record matching process by comparing the maximum inelastic displacements of single-degree-of-freedom systems obtained from Sa-only matched records and Sa- and IP-matched records. We also consider original records to test whether there are any differences between the results of original and matched records and to what extent the differences in structural responses can be attributed to differences in IPs of the record sets. We find that inelastic displacements can be sensitive to the median IP levels of the record sets, and that the consideration of the IP in record matching can be important for the accurate prediction of the seismic performance of structures subjected to near-fault ground motions.

Anahtar Kelimeler

Near-fault ground motions, Pulse-like records, Record matching, Nonlinear dynamic analysis

Anlık Güç Spektrumu ile Eşleştirilmiş Kayıtların Tek Serbestlik Dereceli Sistemlerin İnelastik Yer Değiştirmelerine Etkisi

Öz

Yapının birinci periyodundaki elastik spektral ivme (Sa(T1)) ile anlık güç (IP(T1)) parametresinin birlikte kullanılması, yapının sismik tasarım ve değerlendirilmesinde yakın saha deprem kayıtlarının darbe özelliklerinin açıkça dikkate alınması ihtiyacını ortadan kaldırmaktadır. Yakın zamanda önerilen kayıt eşleştirme algoritmasında, yakın saha yer hareketleri hedef Sa spektrumu ve IP spektrumu ile aynı anda eşleşmektedir. Bu çalışma, IP’nin kayıt eşleştirmedeki önemini yalnızca Sa ile eşleştirilen kayıtlardan ve Sa ve IP ile eşleştirilen kayıtlardan elde edilen tek serbestlik dereceli sistemlerin doğrusal olmayan yer değiştirmelerini karşılaştırarak değerlendirmektedir. Orijinal ve eşleştirilen kayıtların sonuçları arasında herhangi bir fark olup olmadığını ve maksimum yer değiştirmeler arasındaki farklılıkların ne ölçüde kayıt setlerinin IP'lerindeki farklılıklara atfedilebileceğini test etmek için orijinal kayıtlarla da doğrusal olmayan dinamik analizler gerçekleştirilmiştir. Yer değiştirme değerlerinin kayıt setlerinin medyan IP seviyelerine duyarlı olabileceği ve kayıt eşleştirmede IP parametresinin dikkate alınmasının yakın saha yer hareketlerine maruz kalan yapıların performanslarının doğru bir şekilde tahmin edilmesinde önemli olduğu sonucuna varılmıştır.

Anahtar Kelimeler

Yakın saha yer hareketleri, Darbeli kayıtlar, Kayıt eşleştirme, Doğrusal olmayan dinamik analiz

Kaynakça

• Abrahamson, N.A., 1992. Nonstationary spectral matching. Seismological Research Letters, 63(1), 30.
• Abrahamson, N.A., Silva, W.J., and Kamai, R., 2014. Summary of the ASK14 ground motion relation for active crustal regions. Earthquake Spectra, 30(3), 1025–1055.
• Akkar, S., Yazgan, U., and Gulkan, P., 2004. Deformation limits for simple non-degrading systems subjected to near-fault ground motions. In Proc of the 15th World Conferences on Earthquake Engineering (WCEE).
• Alavi, B., and Krawinkler, H., 2004. Behavior of moment-resisting frame structures subjected to nearfault ground motions. Earthquake Engineering & Structural Dynamics, 33(6), 687–706.
• Baéz, J. I., and Miranda, E., 2000. Amplification factors to estimate inelastic displacement demands for the design of structures in the near field. In Proc. of the 12th World Conference on Earthquake Engineering (WCEE).
• Baker, J.W., and Cornell, C.A., 2008. Vector-valued intensity measures for pulse-like near-fault ground motions. Engineering Structures, 30(4), 1048-1057.
• Bertero, V. V., Mahin, S. A., and Herrera, R. A., 1978. Aseismic design implications of near‐fault San Fernando earthquake records. Earthquake Engineering & Structural Dynamics, 6(1), 31-42.
• Chintapakdee, Ch., and Chopra, A.K., 2004. Seismic response of vertically irregular frames: response history and modal pushover analyses. Journal of Structural Engineering, 130(8), 1177-1185.
• Grant, D.N., 2012. Preservation of velocity pulses in response spectral matching. In Proc. of the 15th World Conferences on Earthquake Engineering (WCEE).
• Ibarra, L. F., Medina, R. A., and Krawinkler, H., 2005. Hysteretic models that incorporate strength and stiffness deterioration. Earthquake Engineering & Structural Dynamics, 34(12), 1489-1511.
• Liao, W. I., Loh, C. H., and Wan, S., 2001. Earthquake responses of RC moment frames subjected to near‐fault ground motions. The Structural Design of Tall Buildings, 10(3), 219-229.
• Mazzoni, S., McKenna, F., Scott, M. H., and Fenves, G. L., 2005. OpenSees command language manual. Pacific Earthquake Engineering Research (PEER) Center, Berkeley, CA.
• Nakashima, M., Matsumiya, T., Asano, K., 2000. Comparison in earthquake responses of steel moment frames subjected to near-fault strong motions recorded in Japan, Taiwan and the US. In Proc. of the International Workshop on Annual Commemoration of Chi-Chi Earthquake, Technology Aspect, Taiwan, vol. II., p. 112–23.
• Ricker, N., 1953. The form and laws of propagation of seismic wavelets. Geophysics, 18(1), 10–40.
• Somerville, P.G., Smith, N.F., Graves, R.W., Abrahamson, N.A., 1997. Modification of empirical strong ground-motion attenuation relations to include the amplitude and duration effects of rupture directivity. Seismological Research Letter, 68(1), 199-222.
• Takeda, T., Sozen, M. A., and Nielsen, N. N., 1970. Reinforced concrete response to simulated earthquakes. Journal of the Structural Division, 96(12), 2557-2573.
• Zengin, E., and Abrahamson, N.A., 2020a. A vector-valued intensity measure for near-fault ground motions. Earthquake Engineering & Structural Dynamics, 49(7), 716–734.
• Zengin, E., and Abrahamson, N.A., 2020b. Conditional ground-motion model for damaging characteristics of near-fault ground motions based on instantaneous power. Bulletin of the Seismological Society of America, 110(6): 2828–2842.
• Zengin, E., and Abrahamson, N. A., 2021a. A procedure for matching the near-fault ground motions based on spectral accelerations and instantaneous power. Earthquake Spectra, 37(4), 2545-2561.
• Zengin, E., and Abrahamson, N. A., 2021b. On the Use of Instantaneous Power for Near-Fault Record modification. 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering, doi:10.7712/120121.8818.19489.