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

Year 2022, , 199 - 206, 28.02.2022

Esra Zengin

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

Abstract

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.

Keywords

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

Abstract

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.

Keywords

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

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