FATİH GÖKTEPE, Hüseyin Serdar KÜYÜK, ERKAN ÇELEBİ

Doğalgaz boru hatlarında dalga bariyeri olarak yapay kaya dolgusunun dalga yayılışına etkisi

Depremler yeryüzünün büyük bir kesimini etkileyerek mühendislik yapılarına ciddi hasarlar vermekte ve önemli ekonomik kayıplara yol açmaktadır. Bu yüzden, deprem etkisi altındaki boru hatlarının dayanımı ve güvenliği hayati öneme sahiptir. Zemin titreşimlerinin yayılma alanında ve korunacak yapı çevresinde azaltmak için yatay konumlandırılmış dalga bariyer uygulamaları inşaat mühendisliği çözümleri arasında yer almaktadır. Bu çalışmada yapı-zemin etkileşimi de dikkate alınarak 1999 Kocaeli depreminden kaynaklanan titreşim etkilerinin azaltılması için zeminin radyasyon sönümünü ifade eden enerji yutucu sınırları ve doğrusal olmayan malzeme özelliklerini de içeren bir nümerik model geliştirilmiştir. Geliştirilen bu model yardımıyla dalga bariyer sisteminde farklı kontrol parametrelerinin yalıtım etkisi kapsamlı parametrik çalışmalar yapılarak elde edilmiştir. Elde edilen sonuçlar dalga engelleyici yapay kaya dolgusunun titreşim etkilerinin azaltılmasında %70 mertebesinde etkili olduğunu ve bu tür problemler çözüm olarak gelecekte uygulanabileceğini göstermektedir.

Effect of artificial rock as a wave impeding barrier for wave propagation in pipeline

Earthquakes have destructive influences onto lifeline engineering and especially leading to considerable economic loss to the underground structure. Underground structures are significant unit of lifeline engineering. . Applying horizontal wave barriers is used in civil engineering as an alternative solution to reduce the soil vibrations in the wave propagation region and surrounding of the structures to be protected. In this study, discrete computer model including non-linear soil conditions as well as radiation damping is improved for testing corresponding wave propagation of earthquake vibrations in the soil under 1999 Kocaeli earthquake strong ground motion and mitigation of buried pipeline responses. Extensive parametric investigations by using the developed numerical model for isolation systems have been executed to conceive the influence of different controlling parameters on the screening efficiency. Results indicated that WIB are very promising as a cut off frequency isolators by reduction of * 70% and a promising candidate for future application in the field.

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