Simple design procedure of a friction damper for reducing seismic responses of a single-story structure

2010 ◽  
Vol 32 (11) ◽  
pp. 3539-3547 ◽  
Author(s):  
Kyung-Won Min ◽  
Ji-Young Seong ◽  
Jinkoo Kim
Keyword(s):  
Design Procedure ◽  
Simple Design ◽  
Friction Damper ◽  
Seismic Responses ◽  
Story Structure

A Simple Design Procedure of Seismic Reinforcement Structure with Mild Steel Dampers

2014 ◽  
Vol 1065-1069 ◽  
pp. 1397-1401
Author(s):  
Zhen Huang ◽  
Zuo Wei Qin ◽  
Peng Wu
Keyword(s):  
Energy Dissipation ◽  
Mild Steel ◽  
Design Process ◽  
Design Procedure ◽  
Time History ◽  
Simple Design ◽  
Seismic Responses ◽  
Reinforcement Structure ◽  
Rare Earthquake ◽  
Reinforcement Design

This paper presents a reinforcement design of five-story R/C structure with mild steel dampers in high seismic fortification intensity site. The details of the design process are listed in the paper, and the time history analyses under frequent and rare earthquake are performed on structure models with and without dampers. Through the comparison, the peak of maximum story drifts angles with damper-added structural is reduced by 38% and the distribution is more uniformly. The results show that energy-dissipation design with mild steel dampers can be a reliable and effective method in reducing seismic responses of reinforcement structure.

A Simple Design Approach for Excitation Controller and Power System Stabilizer

2010 ◽  
Author(s):  
G. Fusco ◽  
M. Russo
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Short Circuit ◽  
Design Procedure ◽  
Voltage Regulation ◽  
Operating Conditions ◽  
Power System Stabilizer ◽  
Simple Design ◽  
Wide Range ◽  
System Stabilizer

This paper proposes a simple design procedure to solve the problem of controlling generator transient stability following large disturbances in power systems. A state-feedback excitation controller and power system stabilizer are designed to guarantee robustness against uncertainty in the system parameters. These controllers ensure satisfactory swing damping and quick decay of the voltage regulation error over a wide range of operating conditions. The controller performance is evaluated in a case study in which a three-phase short-circuit fault near the generator terminals in a four-bus power system is simulated.

Simple Design Procedure for Liquid-Filled Steel Conical Tanks

2000 ◽  
Vol 126 (11) ◽  
pp. 1372-1374
Author(s):  
John H. Scarino ◽  
Daniël Vandepitte ◽  
A. A. El Damatty ◽  
R. M. Korol ◽  
M. El Attar
Keyword(s):  
Design Procedure ◽  
Simple Design ◽  
Conical Tanks

Seismic retrofit of structures using rotational friction dampers with restoring force

2020 ◽  
Vol 23 (16) ◽  
pp. 3525-3540
Author(s):  
Asad Naeem ◽  
Jinkoo Kim
Keyword(s):  
Ground Motions ◽  
Design Procedure ◽  
Steel Structures ◽  
Friction Damper ◽  
Heavy Duty ◽  
Limit States ◽  
Restoring Force ◽  
Friction Dampers ◽  
Torsional Spring ◽  
Capacity Spectrum

In this study, the seismic performance of a rotational friction damper with restoring force is presented. The torsional spring friction damper consists of rotational friction pads with the heavy duty torsional springs attached on both sides of the friction damper. An analytical model and a design procedure for the damper are developed using capacity spectrum method. A parametric study is carried out to investigate the influence of the torsional spring in the response of the structure when subjected to ground motions. The seismic performances of steel structures retrofitted with the torsional spring friction damper and conventional rotational friction dampers are evaluated using fragility analysis, which shows that the structure retrofitted with the torsional spring friction damper has the smallest probability of reaching the specific limit states.

DESIGN OF ISOLATED BRIDGES USING POLYNOMIAL FRICTION PENDULUM ISOLATOR

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
T. Y. Lee ◽  
L. Y. Lu ◽  
K. J. Chung
Keyword(s):  
Ground Motions ◽  
Near Field ◽  
Design Procedure ◽  
Design Parameters ◽  
Seismic Responses ◽  
Nonlinear Responses ◽  
Seismic Design Code ◽  
Friction Pendulum ◽  
Isolated Bridges ◽  
Restoring Stiffness

This paper is aimed to develop a design procedure of Polynomial Friction Pendulum Isolator (PFPI), a various-frequency sliding isolator, for decreasing the seismic responses of isolated bridges. Although sliding isolators have been widely used to mitigate seismic hazard, it may be not effective in decreasing the seismic responses of isolated structures subjected to near-field ground motions. The sliding surface of the PFPI is defined by a sixth-order polynomial function to avoid resonance under near-field ground motions. The restoring stiffness of the PFPI possesses softening section as well as hardening section. The structural acceleration response can be decreased by decreasing the restoring stiffness in softening section while the structural displacement response can be decreased by increasing the restoring stiffness in hardening section. However, it is difficult to determine the design parameters of PFPI in practical implementations. This study proposes a design procedure for the PFPI based on the bridge seismic design code in Taiwan. Designers can follow this procedure to easily design the bridge with PFPIs which satisfies the requirements of the code. The bridge with PFPIs designed by using this procedure is analyzed to realize the dynamic nonlinear responses of the bridge under artificial strong earthquake. The results show that the PFPIs effectively decrease the seismic responses of isolated bridges as compared with non-isolated bridges.

A simple design procedure for depth extrapolation operators that compensate for absorption and dispersion

Geophysics ◽  
2007 ◽  
Vol 72 (2) ◽  
pp. S105-S112 ◽  
Author(s):  
Rune Mittet
Keyword(s):  
Frequency Domain ◽  
Design Procedure ◽  
Simple Design ◽  
Prestack Depth Migration ◽  
Depth Migration ◽  
Space Frequency ◽  
Absorption And Dispersion

I compensate for the effects of absorption and dispersion in deriving the space-frequency domain depth extrapolation operators by starting from the ones without such compensation. The procedure is simple and requires only trivial cosine transforms applied to the original noncompensating operators. I show that compensating operators enhance resolution as a function of depth when applied in prestack depth migration.

Simple design procedure for the cold-formed tubular top chord of stressed-arch frames

1994 ◽  
Vol 16 (5) ◽  
pp. 377-385 ◽  
Author(s):  
Murray J. Clarke ◽  
Gregory J. Hancock
Keyword(s):  
Design Procedure ◽  
Simple Design

scholarly journals Bacteria Foraging Algorithm in Antenna Design

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Biswa Binayak Mangaraj ◽  
Manas Ranjan Jena ◽  
Saumendra Kumar Mohanty
Keyword(s):  
Optimum Design ◽  
Optimization Algorithm ◽  
Fitness Function ◽  
Design Procedure ◽  
Design Approach ◽  
Antenna Design ◽  
Simple Design ◽  
Performance Parameters

A simple design procedure to realize an optimum antenna using bacteria foraging algorithm (BFA) is proposed in this paper. The first antenna considered is imaginary. This antenna is optimized using the BFA along with a suitable fitness function formulated by considering some performance parameters and their best values. To justify the optimum design approach, one 12-element Yagi-Uda antenna is considered for an experiment. The optimized result of this antenna obtained using the optimization algorithm is compared with nonoptimized (conventional) result of the same antenna to appreciate the importance of optimization.

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