An experimental study on tuned liquid damper for mitigation of structural response

Abstract

An effective form-finding method for form-fixed spatial network structures is presented in this paper. The adaptive formfinding method is introduced along with the example of designing an ellipsoidal network dome with bar length variations being as small as possible. A typical spherical geodesic network is selected as an initial state, having bar lengths in a limit group number. Next, this network is transformed into the ellipsoidal shape as desired by applying compressions on bars according to the bar length variations caused by transformation. Afterwards, the dynamic relaxation method is employed to explicitly integrate the node positions by applying residual forces. During the form-finding process, the boundary condition of constraining nodes on the ellipsoid surface is innovatively considered as reactions on the normal direction of the surface at node positions, which are balanced with the components of the nodal forces in a reverse direction induced by compressions on bars. The node positions are also corrected according to the fixed-form condition in each explicit iteration step. In the serial results of time history, the optimal solution is found from a time history of states by properly choosing convergence criteria, and the presented form-finding procedure is proved to be applicable for form-fixed problems.

Use of Water Tank as Tuned Liquid Damper (TLD) for Reinforced Concrete (RC) Structures

“…Malekghasemi and Mercan [21] experimentally investigated rectangular TLD using real-time hybrid simulation where the structure was modelled analytically and the TLD was tested in coupled experimentsimulation mode. Bhattacharjee et al [22] investigated the performance of unidirectional tuned liquid damper (TLD) that 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. Sciuva et al [23] investigated the optimization task by using advanced techniques such as genetic algorithms.…”

Seismic Response Improvement of Existing Prototype School Buildings Using Water Tanks, Port Said City, Egypt

“…Many experimental and analytical studies have been done to measure the effectiveness of water damper. Some studies use water tanks as Tuned Mass Damper (TMD) based on Water-Structure mass ratio [8] and [9], while other researches use Tuned Liquid Damper TLD based on wave-structure interaction [10] to reduce lateral displacement of structures. Experimental studies [11] and analytical studies [12] for TLD have been carried out to evaluate the effect of TLD on structure behaviour.…”

Shaking Table Test on Different Positions of Multiple Tuned Liquid Damper

“…Most of the tall buildings have water storage at the top of it as water supply, other than that it just add dead burden on the buildings, however it can be utilize as a damper to take over the energy transfer from the foundation to the structure [4]. Water tank is commonly a rigid tank filled with shallow water (h/L<0.15) where "h" is water depth, "L" is length of tank in the direction of motion [5]. It can be used as passive Tuned Liquid Damper (TLD) without affecting its functional use and at the same time embrace low cost and maintenance.…”

“…It can be used as passive Tuned Liquid Damper (TLD) without affecting its functional use and at the same time embrace low cost and maintenance. When earthquake strike the TLD works based on liquid sloshing to absorb a portion of the dynamic energy and therefore controlling the structural vibration [5]. Large amount of sloshing and wave breaking occurs at the free surface of the liquid that dissipates a significant amount of energy when resonance occur where the frequency of tank motion is close to the frequency of the tank liquid.…”