Análisis de la interacción fluido - estructura en el diseño sísmico de tanques cilíndricos de acero según las normas: americana, neozelandesa, ecuatoriana y métodos simplificados

摘要

Storage tanks are a fundamental part of industrial facilities and they are indispensable in the operation chain of many industries, as in the petroleum industry. During strong seismic events, tanks containing liquids must maintain their structural integrity in order to not jeopardize environmental, economic, nor human resources within its facilities.In comparison with conventional building dynamic behavior, storage tanks seismic response is defined by: fluid – structure interaction, system limited ductility and low structural redundancy. Storage tank seismic design is standardized by industries regulations and international codes.On the other hand, the Ecuadorian construction code does not have specified rules for seismic design of storage tanks; instead, it is commonly accepted to use international codes. Hence, fluid – structure interaction is evaluated for two cylindrical tanks with different height to radius ratios in which international codes and procedures are adapted to the Ecuadorian construction code recommendations for seismic resistant structures. Simplified mechanical models (spring – mass models) derived from each code are evaluated with its computational model made on finite element software – Sap2000. In general, calculated global response results show good agreement with those obtained through computational models; indeed, percentage differences are as low as 2% and arises up to 27% between the models.