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BENZEŞİK DİNAMİK DENEY TEKNİĞİ VE BİR UYGULAMASI

PSEUDO DYNAMIC TESTING METHODOLOGY AND ITS AN APPLICATION

Journal Name:

  • Sigma Mühendislik ve Fen Bilimleri Dergisi

Publication Year:

  • 2009

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Pseudo dynamic testing methodology which aims to simulate earthquake behavior of structures or particular structural components subjected to dynamic loads consists of both the analytical and experimental analyses in a coupled interaction. The test specimen is idealized as a spring-mass discrete system, hydraulic actuators are positioned to the lumped mass levels, and the test specimen is deformed up to the target displacement which is extracted from the analytical calculation. The reaction forces measured from the load cells attached to the hydraulic actuators; are the terms of the stiffness matrix of the test specimen. Based on the experimentally obtained stiffness matrix and the prescribed mass and damping matrices, the dynamic equilibrium equation is generated and the displacement vector to be applied to the specimen in the next step is calculated by using a proper numerical integration technique. This process is repeated for the whole seismic event. Due to application of the loading function in a quasi-static manner, local behavior and damage propagation of the test structure could be traced. Within the context of this study, a pseudo-dynamic testing algorithm for single degree of freedom systems was developed and a computer code was produced. In order to verify the developed algorithm, a steel column was tested under different acceleration levels in the linear and non-linear regions and the test results were compared with the analytical ones.
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Abstract (Original Language): 
Benzeşik dinamik deney tekniği, yapı sistemlerinin veya yapısal elemanların dinamik karakterli yükler etkisindeki davranışının belirlenmesi için, etkileşimli olarak gerçekleştirilen deneysel ve analitik çözümü içermektedir. İncelenecek sistem yığılı kütleli olarak idealleştirilmekte; yığılı kütle konumlarına hidrolik verenler bağlanarak, numune kuramsal hesapta elde edilen yerdeğiştirme durumuna itilmektedir. Hidrolik verenlere bağlı yük ölçerlerden okunan reaksiyon kuvvetleri deney numunesinin rijitlik matrisinin terimlerine karşı gelmektedir. Deneysel olarak belirlenen rijitlik matrisi ile kuramsal olarak oluşturulan kütle ve sönüm matrisleri kullanılarak, dinamik denge denklemi kurulmakta ve seçilmiş bir sayısal integrasyon tekniği kullanılarak hesabın bir sonraki adımında numuneye etkitilecek yerdeğiştirme vektörü belirlenmektedir. Bu işlem dinamik yükleme fonksiyonu sona erene kadar sürdürülmektedir. Yüklemenin duraklamalı olarak uygulanması sebebiyle numune üzerinde hasar oluşumu ve gelişimi izlenebilmektedir. Bu çalışma kapsamında, tek dinamik serbestlik dereceli sistemler için bir benzeşik dinamik deney algoritması geliştirilmiş ve programlanmıştır. Geliştirilen algoritmanın doğrulaması amacı ile bir çelik kolon farklı genliklerdeki ivme kayıtları etkisinde doğrusal ve doğrusal olmayan bölgelerde denenmiş elde edilen sonuçlar kuramsal sonuçlar ile karşılaştırılmıştır.
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  • 4
286-302
  • Turkish

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