Analysis of Irregular High Raised RCC Buildings by Using Tuned Mass Damping System

Abstract

Tall buildings are indispensable in urban areas due to high cost of land, shortage of open spaces and scarcity of lands. The tall buildings are in general highly vulnerable to lateral forces arising out of cyclones and earthquakes. Designing the structures to withstand these occasional lateral forces is very expensive; hence it is not always desirable. The measures to reduce the lateral forces are by way of reducing the weight of the structure and by reducing the exposed faces to thwart wind. However the architectural requirement and the utility of the building have to be honored at all times by the structural designer. Though the technique of Tuned mass damping (TMD) is very well appreciated, the mathematical implications involved in finding the magnitude of mass, stiffness and damping of the TMD is highly intricate and suitable TMD system for a given building structure, which shall remain an integral part of the structure itself, placed on top of the building yet serves the purpose of reducing the earthquake effects on buildings. The TMD methodology adopted for three irregular R.C. framed models having + (Plus)-shape , C-shape and Tshape in plan. This apart the device shall find its utility for all zones of seismic activity and ground/structural conditions and introduces various structural motion control methodologies with focus on tuned mass damping systems. The control properties and some aspects of TMD parameters are outlined. ETABS software is used for dynamic analysis of various shapes of the framed buildings.

Optimal Location of Multiple Tuned Mass Dampers in Regular and Irregular Tall Steel Buildings Plan

“…Selected structures are two-dimensional with 5, 10, and 20 floors, and irregularity is created by changes in the properties of the floors. Reddy et al [23] concluded that mass dampers with mass percentages of 5 are more effective and the dimensions of the dampers should be proportional to the frequency of the structure. Bagheri and Rahmani-Dabbagh [24] used a viscous damper with mass damper to control the vibration of structures and concluded that the mass dampers significantly reduced the structural response and suggested an optimum mass damper (combined mass and viscose dampers) without the need for viscous damper with appropriate performance to be used.…”

Vibration control of steel frames with setback irregularities equipped with semi-active tuned mass dampers

“…Lu et al investigated the effect of the mass ratio of TMDs on super high-rise structures to control structural vibration [18]. The vibration control of high-rise irregular reinforced concrete structures by TMDs was studied by Reddy et al and the results showed that the performance of the TMDs did not change significantly with the addition of shear walls [19]. Elias et al showed that TMDs efficiently reduce the acceleration response of structure more than the displacement of a tall building under the effect of wind and seismic loads [20,21].…”