A Study on Effect of Water Tanks Modeled As Tuned Mass Dampers on Dynamic Properties of Structures

Here a suitable TMD system (water tank as a lumped mass without sloshing effect) is modeled on top/intermediate storey of building. The Response Spectrum method is considered as per IS 1893-Part1-2002. Seven RCC framed buildings are considered; rectangular buildings with vertical irregularity of 10, 14 and 20 storey with height to depth ratio (H/D) as 0.875, 1.23 and 1.6 respectively; and 14 storey L-shaped building with H/D as 1.23; rectangular buildings with vertical regularity of 10, 14 and 20 storey with H/D as 3.9, 5.44 and 8 respectively. The TMDs are modeled, with 3% total weight of each floor, using eight different cases. In total 63 building models are analyzed with/without TMDs by ETABS software and the results are presented. It is found that for extracting the maximum benefits, the buildings shall be modeled with three TMDs using 3-Gauss points at the intermediate storey as it reduces all the three parameters viz. time period, base shear and storey drift simultaneously to the maximum possible extent; and the reduction in the base shear is significant for buildings with smaller H/D as well as with higher H/D too. The TMD models are found to improve the performance of buildings under earthquake loads.

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