Građevinar 8/2012 641 GRAĐEVINAR 64 (2012) 8, 641-646 UDK: 627.824.001.2:624.159.3 Zahra Heirany, PhD Candidate Islamic Azad University (IAU) Science and Research Branch Department of Civil Engineering Tehran, Iran z.heirany@piau.ac.ir Associate Prof. Mohsen Ghaemian Sharif University of Technology Department of Civil Engineering Tehran, Iran ghaemian@sharif.edu Preliminary note Zahra Heirany, Mohsen Ghaemian Effect of foundation in dynamic analysis of concrete gravity dams In this paper, nonlinear dynamic analysis of concrete gravity dams was studied. To investigate the effect of dam-reservoir-foundation interaction, a two-dimensional approach was used including the finite element method, and smeared crack approach. The dam-reservoir interaction is solved by staggered solution procedure while the Sharan boundary condition is applied at the reservoir’s far-end truncated boundary. The foundation is defined as a part of the structure and some different boundary conditions such as Lysmer, Boulder and damper boundary conditions are applied at its truncated boundaries. Results show that when the nonlinear analysis includes the dam - foundation interaction and the foundation’s mass, flexibility and radiation damping, the gravity dam’s response will be acceptable. Key words: concrete gravity dams, dam-reservoir-foundation interaction, boundary condition Prethodno priopćenje Zahra Heirany, Mohsen Ghaemian Utjecaj temelja na dinamičku analizu betonskih gravitacijskih brana U članku se opisuje nelinearna dinamička analiza betonskih gravitacijskih brana. Zbog analize međudjelovanja akumulacije i temelja upotrebljavaju se dvodimenzionalni pristup i metoda konačnih elemenata uz primjenu modela razmazanih pukotina. Međudjelovanje brane i akumulacije riješeno je prikladnim rastavom sustava jednadžbi, dok je Sharanov rubni uvjet primijenjen na najudaljeniji rub akumulacije. Temelj je definiran kao dio konstrukcije pa se na njegove rubove primjenjuju drugačiji rubni uvjeti poput Lysmarovog i Boulderovog te rubnog uvjeta s prigušivačima. Rezultati pokazuju da je odziv gravitacijske brane zadovoljavajući kada se u nelinearnu analizu uključi međudjelovanje brane i temelja, masa temelja, fleksibilnost i radijacijsko prigušenje. Ključne riječi: betonske gravitacijske brane, međudjelovanje brana – akumulacija – temelji, rubni uvjet Vorherige Mitteilung Zahra Heirany, Mohsen Ghaemian Einfluss des Fundaments auf die dynamische Analyse von Betongewichtsstaumauern In dem Artikel wird die nicht-lineare dynamische Analyse von Betongewichtsstaumauern analysiert. Zum Zwecke der Analyse der Wechselwirkung von Talsperre, Speicher und Fundament wurde die zweidimensionale Vorgehensweise und die Finite-Elemente-Methode unter Anwendung des verschmierten Rissmodells angewendet. Die Wechselwirkung der Talsperre und des Speichers wurde durch die entsprechende Zerlegung des Gleichungssystems gelöst, während die Sharan – Randbedingung an dem am weitesten gelegenen Speicherrand angewendet wurde. Das Fundament ist als Teil der Konstruktion definiert, so dass auf seine Ränder andere Randbedingungen, wie z.B. Lysmer- und Boulder sowie jene von Tilgern angewendet werden. Die Resultate zeigen, dass die Einflussreaktion der Gewichtsstaumauern befriedigend ist, wenn in der nicht-linearen Analyse die Wechselwirkung von Talsperre und Fundament, Fundamentmasse, Elastizität und Strahlungsdämpfung mit eingerechnet werden. Schlüsselwörter: Betongewichtsstaumauern, Zwischenwirkung der Talsperren – Speicher – Fundamente, Randbedingung, Effect of foundation in dynamic analysis of concrete gravity dams Primljen / Received: 28.11.2011. Ispravljen / Corrected: 21.7.2012. Prihvaćen / Accepted: 31.8.2012. Dostupno online / Available online: 15.9.2012. Autori: