Tuned Liquid Damper

IRJET, 2022

The goal of this study is to examine the Tuned Liquid Damper (TLD) and Column Tuned Liquid Damper (CTLD), which are based on the movement of liquid in a rigid tank to change a structure's dynamic properties and lessen vibration energy during seismic excitation. A three-storey structure was created for this purpose and put through vibration tests. TLD and CTLD is install at top floor separately for different frequencies. A TLD and CTLD, is a device that employs water restrained in a container that is usually placed on top of a building to limit the displacement of the system when it is subjected to excitation. On a scaled model of the structure with TLD and CTLD, several experimental observations are made to assess their operation when subjected to seismic excitation. Using controlled uniaxial shake table testing, a rectangular-shaped TLD and CTLD with varying mass ratios are evaluated over various frequencies. Based on the structure's response reduction, TLD and CTLD effectiveness are assessed. The experiment's sensor, an accelerometer, measures the structure's acceleration in the presence and absence of a TLD and a CTLD while it is subjected to vibrations.

2014

Current trends in construction industry demands taller and lighter structures, which are also more flexible and having quite low damping value. This increases failure possibilities and also, problems from serviceability point of view. Several techniq ues are available today to minimise the vibration of structure, out of which concept of using of TLD is a newer one. This study was m ade to study the effectiveness of using TLD for controlling vibration of structure. For actual analysis process simple plan of building was decided according to requirements building structure water tank was designed and effective water depth designed from impulsive and co nvective concepts of water during vibration. A ten story building was considered for the study. The effectiveness of the TLD was calculated in terms of amplitude of displ acements at top story of the structure. From the study it was found that, TLD can effectively used to control the vibration of the structure. Only TLD which were properly tuned to natural frequency of structure was more effective in controlling the vibration. The damping effect of TLD is sharply decreases with mistuning of TLD.

2018

An earlier mathematical research of a single-degree-of-freedom (SDOF) framework strictly sustaining a tuned fluid damper (TLD) and also based on broad-band ground movements, has actually revealed that a TLD needs to be correctly developed for efficiently minimizing the action of the framework. In this paper, a detailed research of the impacts of numerous ground movement specifications on the capacity of a TLD to minimize architectural feedback for quake base activities exists. It is revealed that the regularity material and also transmission capacity of the ground activity do not dramatically influence the performance of the TLD. Because TLD is a nonlinear system, its efficiency raises with a boost in the strength of the ground movement. In addition, considering that TLD acts as a thick damper, it cannot lower the action in the initial couple of cycles of resonance. As a result, TLD is a lot more efficient for the far-field ground movements, where the strong-motion stage as well as ...

2021

Department of Civil Engineering, Haldia Institute of Technology, Haldia The performance of Tuned Liquid Damper (TLD) to mitigate the seismic vibration of structures under different real earthquake time history is investigated in the present study. The effectiveness of a tuned liquid damper (TLD) is demonstrated in this paper. TLD structural vibration can be used in the construction of damp structures. A tuned liquid damper is water contained in a container, usually placed on top of a building that uses the water's sloshing power to reduce the system's dynamic response to stress.Tuning is the frequency of TLD to the fundamental frequency of structure will result in a large amount of energy dissipation. Most of the researches have studied using TLD on controlling the response of structures under wind loads. Herein, a MDOF system is analysed for determining the displacement of the structure using Newmark Beta method with the help of MATLAB coding, considering a standard model o...

Civil Engineering and Architecture, 2023

A Tuned Liquid Damper (TLD) is a passive damper that is capable of reducing the dynamic response of a structure to earthquake through an anti-phase sloshing fluid mechanism that has been settled. TLD can be very effective for structural stability if its parameters are designed properly. The parameters that determine the effectiveness of the TLD are mass ratio, which is the ratio of the liquid mass to the structure mass, and frequency ratio, which is the ratio of the sloshing frequency to the natural frequency of the structure. This study investigated the performance of TLD in a building under different time history characteristics, which are classified as Near-and Far-Fault Earthquakes. In addition, six excitation frequency ratios were also investigated. A 15-story building with and without TLD was modeled using SAP2000. The building model was tested with various excitation frequency ratios and various ground motion characteristics. The reduction of peak displacement under time history and excitation frequency ratios has been investigated. The results show that TLD will be more effective under far-fault earthquakes and also if it is subjected to a dynamic load that is close to resonant frequency (f e /f s ≈ 1).

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019

The behavior of tuned liquid dampers subjected to random base motion has been investigated extensively. However, their efficiency in reducing the dynamic response of structures under earthquake excitation is still not completely understood. A non-linear modeling strategy based on Yu's model was implemented to perform numerical analyses on a 21-story building subjected to seismic base excitation. Three tank shapes were investigated: a rectangular tank, a vertical cylindrical tank, and a horizontal cylindrical innovative TLD. An experimental campaign has been conducted on a scaled physical model in order to calibrate the numerical model and validate its results. The effects of the dampers were evaluated in terms of structural relative displacements and absolute accelerations. Dampers efficiency in reducing the structural response was evaluated for different mass ratios. The non-linear numerical model showed good capability in reproducing experimental results for the rectangular tank. Some limitation has been evidenced for the other tank shapes, suggesting the use of different numerical techniques or the development of specific non-linear mechanical models. Results obtained from experimental and numerical analyses show that reduction of peak response during earthquake excitation is often limited and dependent on ground motion history. However, TLDs where found to be effective in reducing structural response when the structure experience free vibration motion. COMPDYN 2019 7 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

Proceeding of 2nd International Colloquium on Computational & Experimental Mechanics (ICCEM 2021)

This study proposes a vibration attenuation technique for two-degree of freedom (two DOF) vibration system using Tuned Mass Damper (TMD) and Tuned Liquid Column Damper (TLCD). A model of a two-storey building is utilized to express a two DOF vibration system. The experimental study is conducted to evaluate the performance of TMD and TLCD for attenuating the vibration amplitude of the building. The TMD and TLCD systems were mounted on the building upper floor, and their frequencies were tuned to the first and second vibration modes of the building structure, respectively. The best values for TMD mass and TLCD fluid volume were experimentally determined. The effects due to the TMD mass and TLCD volume variation in the system response were evaluated from the Frequency Response Function (FRF) obtained through modal testing. The experimental results show that a 0.351 kg mass for TMD and 427 mL volume in liquid for TLCD were the most effective at reducing the two-storey building model's vibration response. The experimental study has shown that the appropriate selection of a TMD mass and TLCD fluid volume can significantly reduce the system response.

Second International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2015, 2015

At the present time, an earthquake is one of the problems for the high-rise building structures. This paper presents an analysis and an examination of Tuned Mass Damper (TMD) in order to study the possibility of using the water tank as the TMD. The finite element method is used as a tool in structural analysis. A study of four, eight and twelve story-three dimensional reinforced concrete buildings with water tank placing on the roof is evaluated. The total mass of the whole system including water tank, water, beams,columns and slabs are considered. The behavior of the tank subjected to both El-Centro 1940 and Chichi 1999earthquake data are studied under the condition of full water within a tank. The lateral displacements of the building without water tank are compared with the building with full water tank. In conclusion, use of the water tank is found to be able to reduce vibrations from earthquake in some cases.

This paper investigates the performance of a new type of cost-efficient damper for mitigating wind and earthquake induced vibrations in tall buildings. Tuned Liquid Damper (TLD) is a type of Tuned Mass Damper (TMD) where the mass is replaced by a liquid (usually water). A TLD relies upon the motion of shallow liquid in a rigid tank for changing the dynamic characteristics of a structure and dissipating its vibration energy under harmonic excitation. The effectiveness of TLD is evaluated based on the response reduction of the structure which is a two-storied steel building frame. Various parameters that influence the performance of TLD are also studied.