EVALUATION OF THE DAMPING POTENTIAL OF WATER SUPPLY TANKS DUE TO DYNAMIC WIND-INDUCED RESPONSES IN CONCRETE BUILDINGS

Pedro José Furlani Vidal¹; Tereza Denyse de Araújo¹

¹ Universidade Federal do Ceará

doi:10.20906/CPS/CILAMCE2015-0286

Resumo

Understanding as each structural element contributes to the dynamic behavior of the structure is important for a correct building design. Water supply projects in Brazil place water tanks at the top of structures. A large concrete substructure full of water placed over the roof of buildings may affects global lateral displacement, either by amplifying horizontal motion or by acting as an auxiliary damping system known as tuned liquid damper (TLD). These effects are verified analyzing a 14-storey concrete construction and its reservoir. Modeling of the building and the water reservoir are made using the finite element software SAP2000 v14, through a 3-D solid mesh. Water motion inside the tank is simulated using the mechanistic model proposed by Housner (1963). Results show that the tank's concrete structure raises lateral displacements caused by dynamic loads of wind as its water acts to reduce these displacements. Depth variation due to water consumption changes considerably the reservoir's damping characteristics, meaning that the water plus tank ensemble raises lateral displacement. Water supply tanks effects over dynamic behavior should not be neglected during the structural design of high buildings.

Palavras-chave: Concrete buildings; Passive vibrations control; Wind-induced vibrations; Tuned Liquid Dampers