Single and multiple TMD optimization to control seismic response of nonlinear structures

2022 ◽  
Vol 252 ◽  
pp. 113667
Author(s):  
Martín Domizio ◽  
Hernán Garrido ◽  
Daniel Ambrosini
Keyword(s):  
Seismic Response ◽  
Nonlinear Structures

Time-Delay Effects on Controlled Seismically Excited Linear and Nonlinear Structures

2016 ◽  
Vol 16 (07) ◽  
pp. 1550031 ◽  
Author(s):  
Helmi Temimi ◽  
Mohamed Ben-Romdhane ◽  
Sami El-Borgi ◽  
Young-Jin Cha
Keyword(s):  
Time Delay ◽  
Eigenvalue Problem ◽  
Seismic Response ◽  
Critical Time ◽  
Control Design ◽  
Nonlinear Structures ◽  
Stability Criteria ◽  
Delay Effects ◽  
Linear And Nonlinear ◽  
Simulation Results

The main purpose of this paper is to examine the influence of time delay associated with a semi-active variable viscous (SAVV) damper on the response of seismically excited linear and nonlinear structures. The maximum time delay is estimated on the basis of stability criteria, which consist of analyses of structural modal properties. Numerical computation of the critical time delay is performed by using dichotomic approach, which is based on multiple solving of the eigenvalue problem. Simulation results indicate that variable dampers can be effective in reducing the seismic response of structures, and that time-delay effects are important factors in control design of seismically excited structures. Furthermore, simulation results show degradation of performance whenever the actual delay exceeds the calculated critical time delay, which shows the accuracy and reliability of the proposed approach.

A Simplified Procedure to Assess the Seismic Response of Nonlinear Structures

2000 ◽  
Vol 16 (4) ◽  
pp. 715-734 ◽  
Author(s):  
T. Albanesi ◽  
C. Nuti ◽  
I. Vanzi
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Iterative Procedure ◽  
Nonlinear Structures ◽  
Plastic Range ◽  
Maximum Displacement ◽  
Equal Energy ◽  
Dynamic Integration ◽  
Simplified Procedure ◽  
Equal Displacement

The paper presents an improvement of the iterative procedure proposed in the ATC 40 document to evaluate seismic response of nonlinear structures in terms of maximum displacement and acceleration, given the structural initial elastic period, the yielding acceleration and the hardening ratio in the plastic range. As a second issue the results of the procedure are compared with nonlinear step by step dynamic integration, with the bilinear and Takeda model, and with the assumptions of equal energy and equal displacement. Two case studies of existing reinforced concrete buildings are further examined. For the cases examined, the ATC 40 procedure is overall as or less precise than the simpler equal energy and equal displacement principles.

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