The Investigation of the effect of earthquake type on the structure s behavior with Tuned liquid damper with variable baffles under semi-active control

Earthquake as a natural hazard jeopardizes civil structures and infrastructures. Iran is a seismically susceptible country compelling experts to adopt appropriate counter measures in design practices. In this regard the structural control conceptis well known from which semi active control methodologies have been addressed vastly by scholars during last two decades. These methods impose controlling actions by changing stiffness and damping traits of the structure. In addition to provisions to be considered in the structure side, earthquake properties originated from distance to source fault should be dealt with as near and far field categories. In this paper, we are aimed to evaluate efficacy of a liquid damper with adjustable blades in a semi active scenario. Generally, liquid dampers have low installation and maintenance costs that make them as a suitable choice in many applications. The structural model is single degree of freedom subjected to 6 far field and 6 near field earthquakes. A fuzzy algorithm has been developed to handle the blades rotation in the semi active control.The algorithm adjusts the blade angle based on corresponding damping ratios adopted from a previous research. Results of analyses demonstrate that the damper can reduce structural responses significantly. This reduction about responses from near field ground motions are greater than those of far field ground motions.