Optimal Placement of Dampers on Multistorey Frames Using Dynamic Analysis
- PDF / 1,098,899 Bytes
- 10 Pages / 594 x 792 pts Page_size
- 16 Downloads / 179 Views
OPTIMAL PLACEMENT OF DAMPERS ON MULTISTOREY FRAMES USING DYNAMIC ANALYSIS O. S. Hussiena,b,1 and M. I. Elamyc,d,2
UDC 539.4
The use of a damping system is one of the seismic protection systems that improve the seismic response of structures. The proposed methodology estimates the location (which bay and which floor) where the dampers must be placed to dissipate the maximum energy. The goal is the cost reduction comparing the optimal place to a uniform damper placement (one damper per floor). The historical analysis of two earthquakes, El Centro and Altadena, was performed to investigate the optimum locations of dampers. Numerical simulations are performed to verify the feasibility and effectiveness of the optimization method. Finally, several significant conclusions are given based on numerical results. The numerical cases based on the use of SolidWorks2016 and SAP2000 programs are modified by introducing unified mechanical properties. This made it possible to reflect the Eigen-nature of frame structures. Keywords: viscoelastic dampers, tall buildings, optimal placement, seismic resistance. Introduction. Damper optimization is a new idea, which has been investigated in recent years. The problem of choosing the optimal location to put the dampers in tall buildings has been studied over the past years. The solution to the problem is finding the location where dampers can dissolve the most amount of energy. The optimal placement is achieved when this condition is satisfied. Herein, three different optimization objectives are presented, minimize the maximum to each of the displacement at the top of the structure, inter-story drift, and acceleration at the top of the structure. Earthquake actions are considered the main factor in designing tall buildings. The objectives of the viscous dampers are to absorb and dissipate large amounts of energy, improve mechanical performance and seismic characteristics. There are many kinds of forms of viscous dampers. One is mega-brace dampers, which possess the advantage of enlarging the relative displacement at the endpoints of the dampers, thus offering the dampers a better ability of energy dissipation. The choice of places for dampers should consider two factors, namely damping and stiffness. Dampers should be set up in the positions, which hardly influence the rigidity failing but offer larger damping. Another factor reflects with how much energy the dampers devour. These devices could be active or passive, and their implementation depends on the project investment. The active devices change their properties as a function of the structural response, which makes theme the most expensive. On the other hand, passive devices are cheaper than active devices, presenting a low cost for installation and maintenance. 1. Literature Review. Tovar and López [1] presented how the variation of placement and number of dampers affected the seismic response of a frame structure and evaluated a simplified method to analyze frame a
Civil Engineering Department, Northern Border University, Arar,
Data Loading...
