Seismic Analysis of RC Silos Dynamic Discharge Phenomena
Islam M. Ezz El-Arab
Islam Ezz El-Arab, Structural Engineering Department, Tanta University, Faculty of Engineering, Tanta, Egypt.
Manuscript received on November 22, 2014. | Revised Manuscript received on December 11, 2014. | Manuscript published on December 30, 2014. | PP: 91-99 | Volume-4 Issue-2, December 2014. | Retrieval Number: B3598124214/2013©BEIESP
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Abstract: This paper presents the characteristics of the flow pattern and wall pressures observed during filling and emptying of cylindrical silo during gravity discharge. The paper presents recent and current researches on these phenomena. The dynamic discharge phenomenon is influenced by various factors related to the type of flow pattern developed in the silos and the flow properties of the bulk material of particular, and the velocity at critical sections in the silo during discharge. Moreover, In order to ensure the accuracy for modified finite element model that is presented in paper; it is verified with other’s experimental results. Under different three types of earthquake ground excitations; Al-Aqba, 1995, Northridge, 1994, and El-Centro, 1940; the paper is dissected the silo discharge phenomenon; which has a stress peak during the dynamic discharge of the silo. Caused by that fact, the modeling of silo should be taken this phenomena effect in the simulation. Especially, this phenomenon has great effect on the silo mass distribution which reflects on the flow of granular material during filling and discharge. In order to ensure the presented finite element results; it is investigated for a real case study, Silo of Royal El-Menia Factory in Upper Egypt to be checked a model results with ACI 313-97 provision results to evaluate and comment on results.
Keywords: Silo, Seismic analysis, Dynamic discharge phenomena.