Dynamic Behavior of Steel Frames With Tuned Mass Dampers

Abstract

In this paper, the application of tuned mass damper in improving the response of structures is considered. At first, three frames of 3, 9 and 20 stories are evaluated in which time history analysis is done according to El -Straw earthquake. The maximum reduction of among the three mentioned frames belongs to a 20-stories structure in which the rate of story displacement reduction is between 25 to 45%, and this indicates that by increasing the height of the structure, the performance of tuned mass damper improved. In the second part, the effect of semi-active tuned mass damper is studied on a 10-stories frame. Studies showed that using a tuned mass damper system with viscous damper with controller force decreases the average of maximum displacement of roof story down to 39.9 % and this amount of reduction is 22.8% for semi-active tuned mass damper. Finally, the performance of tuned Single and multiple mass Damper is evaluated on a 20-stories frame, and the results show that single and multiple dampers decrease structures 'responses and the performance of tuned multiple dampers depends on the mass and frequency ratio and also concluded that the performance of tuned multiple mass dampers is reduced by transition to middle of the structure stories.

Design of Dry Friction Damper to Reduce Vibration Impacts to Circuit Cards at Critical Frequencies

“…There are known technologies [6,7,14] designed to reduce vibration amplitude either by increasing stiffness of circuit cards or by applying viscous damping mechanisms. Increasing stiffness of circuit cards by rigid fixing to an enclosure case and by rigid fixing enclosure case to the platform, or embedding to circuit card design a stiffener to reduce its deformation are supposed to increase their mass and size and do not exclude circuit card oscillation since they copy oscillations of enclosure case and then transmit them to installed electronic components what may cause mechanical damage especially in resonance condition.…”

“…Other publications are focused on ways for vibration reduction and suppression. In [6] a viscous damper with controller force to decrease the average of maximum displacement is represented as single and multiple mass dampers. In [7] particle damping is represented as an effective method of passive vibration control, the prediction of particle damping performed by using neural network is here studied.…”

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

“…The coefficient of each structure based on its number of stories and the force in the last segment is given in Table 4. Regarding the equation of motion, a thorough explanation is given in our previous research [88][89][90], and the reader is referred to those papers.…”