Análise do potencial amortecedor de caixas d'água sobre vibrações devido ao vento em edifícios de concreto

Abstract

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 liquid placed over the roof of buildings may affects global lateral displacement, either by amplifying horizontal motion or by acting as an 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 (CSI, 2009), 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. The water and its depth variation due to consumption do not affect lateral displacement considerably, 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 buildings, but liquid motion may be ignored when designing small buildings