Abstract
In this study shaking table tests which are applied on 3-Storey reduced shear frame models with TLD’s subjected to harmonic loadings are presented. Firstly, free vibration experiments are conducted on the structure and 1st free vibration frequency of the structure is determined. The structure is shaken under harmonic loading at a frequency equal to 1st frequency of the structure which provides the resonance condition. Displacements and accelerations are measured at storey levels of the structure. A container in a rectangular prism shape is manufactured as a TLD model. Liquid is poured in the container and the same experiments are repeated at different liquid heights. The effect of TLD application on the structural models considering displacement and acceleration of the structure are investigated. In addition the effect of TLD application and its allocation at different storey levels are calculated experimentally. As a result of the conducted experiments, most convenient TLD models considering both displacement and acceleration behavior are determined. It is observed that all the damping models cause significant levels of reduction in seismic behavior of the structure under harmonic loading.
Highlights
In recent days, a number of methods have been developed in order to reduce dynamic excitation such as wind and earthquake excitations
Two types of Tuned liquid dampers are commonly used which are called (i) tuned liquid dampers which consist of rectangular section tank and (ii) tuned liquid column dampers which have two limbs of tubes filled with same kind of liquids as seen schematically in Figures 2 (a) and 2 (b)
TLD formulation can be simplified in order to explain their behavior associated to EPJ Web of Conferences 143, 02001 (2017 )
Summary
A number of methods have been developed in order to reduce dynamic excitation such as wind and earthquake excitations. As shown for a single degree of freedom system with TLD model, Tuned Liquid Dampers (TLD’s) are passive energy dissipation systems which consist of water tank and sloshing viscous fluid. These devices absorb dynamic inputs; structures are protected against damage or collapse. For the condition of lateral accelerations of water tank, while part of water level rises, another part decreases simultaneously This sway movement supplies energy absorption arising from dynamic forces. Characteristics of multiple tuned liquid column dampers (MTLCD) were searched by Gao et al [12] for suppressing structural vibration They have discussed advantages and disadvantages of multiple tuned liquid column dampers in their research. On the other hand an MTLD has almost equal influence, if breaking waves has already existed
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