THE EFFECT OF VISCOSITY VARIATION ON RECTANGULAR WATER TANK TUNED LIQUID DAMPER ON THE CAPACITY OF STRUCTURAL RESPONSE

• Main Author: ZAKIAH PUTRI, GITA
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/27556
• Institution: Institut Teknologi Bandung

<p align="justify">Currently the use of building control equipment, both semi-active and passive active has been implemented in various buildings in order to minimize the dynamic response caused by earthquake loads. The topic of this thesis relates to the development of passive structure device systems. The use of building control equipment aims to ensure the performance of seismic isolated structures with the use of passive energy dissipation devices. Energy dissipation devices work in such a way as to shorten the vibrational response of structures that are subjected to dynamic loads. Tuned Liquid Damper (TLD) is conceptually a Tuned Mass Damper (TMD) with fluid as a mass. Both have parameters of mass, stiffness and damping. However, TLD also has hydrodynamic pressure. Hydrodynamic pressure caused by earthquake movements is separated into impulsive and convective terms. The impulsive component is the interaction between the tank wall and the liquid and is very dependent on the flexibility of the wall while the convective component is induced by slosh waves. Sloshing waves are very instrumental in enhancing attenuation characteristics. The working principle of this silencer is to utilize the mass of the liquid and the inertial force of the wave motion which when given the sloshing phase ground ground acceleration movement is almost opposite to the phase of the structural response, the more similar the vibration period, the wave back and forth between the water and the period of building vibration is more optimal reduction of dynamic response obtained. so that the sway that occurs in the building can be muffled. Viscosity is a measure that expresses the viscosity of a liquid related to the resistance of a liquid to flow. The smaller the viscosity of the liquid, the faster the flow velocity and the more random, and conversely the greater the large viscosity value, the greater the fluid bridge to flow. Thus, the phenomenon of the attenuation effect of TLD is better. The object building is a 12-story office building with additional passive dampers, design by ETABS, then the building is tested using 4 earthquake history data, namely the El centro, Hokkaido, Mexico and Northridge earthquakes, each of which has been spectral matched to the city of Bandung, after matching the peak frequency of each earthquake in a row 0.6 Hz, 0.9 Hz, 1.0 Hz, and 0.6 Hz The main objective of this thesis research is to analyze the effectiveness of the tank rectangular Tuned Liquid Damper in controlling structural response when subjected to earthquake loads. TLD is designed for 0.612Hz structure frequency which is subject to random excitation in the form of an earthquake. The results of the calculation and analysis obtained are TLD capable of reducing the dynamic response that occurs in the structure, both acceleration, speed, and displacement. This attenuation level has not been able to significantly improve dynamic response, but it has been able to increase the level of structural comfort which refers to "Vibrations in Structures Induced by Man and Machines" where the structure is equipped with a passive damper device system TLD has a better level of comfort during a maximum earthquake happens compared to the system without additional dampers. The viscosity itself also affects the level of reduction of the TLD, but it is not so significant, the maximum increase in attenuation is up to 34.2% than the use of ordinary water. Of the 4 earthquake tests, the earthquake that is best damped by the TLD for this type of 12-story office structure is the Hokkaido and Mexico earthquakes, each of which has a peak frequency value between 0.9Hz - 1.1Hz, namely the maximum reducing given is 34.3% measured from the response displacement of the roof structure.<p align="justify"> <br />