Dynamic response of adjacent structures connected by friction damper

2011 ◽  
Vol 2 (2) ◽  
pp. 149-169 ◽  
Author(s):  
C.C. Patel ◽  
R.S. Jangid
Keyword(s):  
Dynamic Response ◽  
Friction Damper ◽  
Adjacent Structures

scholarly journals Earthquake response of adjacent structures with viscoelastic and friction dampers

2015 ◽  
Vol 42 (4) ◽  
pp. 277-289
Author(s):  
Miodrag Zigic ◽  
Nenad Grahovac
Keyword(s):  
Energy Dissipation ◽  
Fractional Derivatives ◽  
Viscoelastic Body ◽  
Dynamical Behaviour ◽  
Friction Damper ◽  
Adjacent Structures ◽  
Moving Base ◽  
Earthquake Model ◽  
Horizontal Ground Motion ◽  
Fractional Zener Model

We study the seismic response of two adjacent structures connected with a dry friction damper. Each of them consists of a viscoelastic rod and a rigid block, which can slide without friction along the moving base. A simplified earthquake model is used for modeling the horizontal ground motion. Energy dissipation is taken by the presence of the friction damper, which is modeled by the set-valued Coulomb friction law. Deformation of viscoelastic rods during the relative motion of the blocks represents another way of energy dissipation. The constitutive equation of a viscoelastic body is described by the fractional Zener model, which includes fractional derivatives of stress and strain. The problem merges fractional derivatives as non-local operators and theory of set-valued functions as the non-smooth ones. Dynamical behaviour of the problem is governed by a pair of coupled multi-valued differential equations. The posed Cauchy problem is solved by use of the Gr?nwald-Letnikov numerical scheme. The behaviour of the system is analyzed for different values of system parameters.

Effects of Slenderness and Fundamental Frequency on the Dynamic Response of Adjacent Structures

2019 ◽  
Vol 19 (09) ◽  
pp. 1950105
Author(s):  
Gonzalo Barrios ◽  
Vinuka Nanayakkara ◽  
Pramodya De Alwis ◽  
Nawawi Chouw
Keyword(s):  
Dynamic Response ◽  
Fundamental Frequency ◽  
Soil Structure ◽  
Numerical Models ◽  
Ground Motions ◽  
Soil Structure Interaction ◽  
Reference Case ◽  
Maximum Acceleration ◽  
Structure Interaction ◽  
Adjacent Structures

In conventional seismic design, the structure is often assumed to be fixed at the base. However, this assumption does not reflect reality. Furthermore, if the structure has close neighbors, the adjacent structures will alter the response of the structure considered. Investigations on soil–structure interaction and structure–soil–structure interaction have been performed mainly using numerical models. The present work addresses the dynamic response of adjacent single-degree-of-freedom models on a laminar box filled with sand. Impulse loads and simulated ground motions were applied. The standalone condition was also studied as a reference case. Models with different fundamental frequencies and slenderness were considered. Results from the impulse tests showed that the top displacement of the models with an adjacent structure was reduced compared with that of the standalone case. Changes in the fundamental frequency of the models due to the presence of an adjacent model were also observed. Results from ground motions showed amplification of the maximum acceleration and the top displacement of the models when both structures have a similar fundamental frequency.

scholarly journals Seismic pounding of a case of adjacent multiple-storey buildings of differing total heights considering soil flexibility effects

2001 ◽  
Vol 34 (1) ◽  
pp. 40-59 ◽  
Author(s):  
A. M. Rahman ◽  
A. J. Carr ◽  
P. J. Moss
Keyword(s):  
Dynamic Response ◽  
Experimental Studies ◽  
Structural Response ◽  
Time History ◽  
Soil Mass ◽  
Adjacent Structures ◽  
Frequency Independent ◽  
Moment Resisting ◽  
Soil Flexibility ◽  
Simple Mass

Collisions between adjacent structures due to insufficient separation gaps have been witnessed in almost every major earthquake since the 1960's. Although many analytical, numerical and experimental studies have been conducted into the pounding phenomenon, the number of those which take into account the effects of the underlying soil mass on the dynamic response of the colliding structures are almost negligible. The present study incorporates the effects of soil flexibility on the inelastic dynamic response of a particular case of adjacent 12- and 6-storey reinforced concrete moment-resisting frames. The time- history response of this system (linear soil behaviour and nonlinear structural response) subjected to actual earthquake records is evaluated by means of the structural analysis software RUAUMOKO developed at the University of Canterbury. A simple mass-spring-dashpot model is used to represent the frequency independent dynamic soil properties. Impacts at storey levels only are considered. This study highlights serious inconsistencies in the assumptions of previous pounding studies, which neglect the effects of soil flexibility. Also, the pounding response of the adjacent structures is found to be highly sensitive to the characteristics and direction of the seismic excitation.

Dynamics of Frame Foundations Interacting With Soil

1980 ◽  
Vol 102 (2) ◽  
pp. 303-310 ◽  
Author(s):  
L. Gaul
Keyword(s):  
Dynamic Response ◽  
Boundary Value Problems ◽  
Arbitrary Shape ◽  
Mixed Boundary ◽  
Shear Stresses ◽  
Entire System ◽  
Substructure Method ◽  
Adjacent Structures ◽  
Single Structure ◽  
Underlying Soil

The dynamic response of structures such as frame foundations for vibrating machinery is calculated. The interactions between a single structure and soil as well as the interaction through the underlying soil between two adjacent structures are taken into account. Mixed boundary value problems describing the interaction between viscoelastic soil and rigid bases of arbitrary shape are solved by superposition of analytical halfspace solutions. The influence of shear stresses at the interface between soil and base is bounded by the assumptions of perfectly smooth and perfectly welded contact. The response of the entire system is evaluated by coupling soil and founded structures by means of a substructure method.

A Smart Base-Isolation Using Piezoelectric Friction Damper

2011 ◽  
Vol 250-253 ◽  
pp. 1281-1286 ◽  
Author(s):  
Na Xin Dai ◽  
Ping Tan ◽  
Fu Lin Zhou
Keyword(s):  
Dynamic Response ◽  
Control Strategy ◽  
Base Isolation ◽  
Friction Damper ◽  
Isolation System ◽  
High Efficient ◽  
Base Isolation System ◽  
External Power ◽  
Rubber Bearings ◽  
Smart Base Isolation

A smart base-isolation system, composed of low damping bearings and piezoelectric friction damper is studied in this paper. The semi-active piezoelectric friction damper (PFD[1]) is proposed for control of peak dynamic response of seismic-excited structures. In the proposed PFD device, the friction force between two sliding plates is regulated by controlling the normal force using piezoelectricity across the damper, and its advantage is that its operation requires only minimal external power. A high efficient control algorithm is proposed for the semi-active control of the friction damper using a simple static output. The effectiveness of the PFD device and the control strategy in reducing the peak dynamic response of structures is investigated through an application to a 5-story base-isolated building. Numerical results demonstrate that the proposed PFD device and the control strategy are effective in reducing the peak drift of rubber-bearings of the base-isolated building subject to earthquakes.

Theoretical Dynamic Analysis of a Cantilever Beam Damped by a Dry Friction Damper

1995 ◽  
Author(s):  
I. Korkmaz ◽  
J. J. Barrau ◽  
M. Berthillier ◽  
S. Creze
Keyword(s):  
Dynamic Response ◽  
Cantilever Beam ◽  
Dry Friction ◽  
Coulomb Friction ◽  
Contact Stiffness ◽  
Temporal Integration ◽  
Element Model ◽  
Friction Damper ◽  
Coulomb Friction Law ◽  
Good Agreement

Abstract The dynamic behavior of a cantilever beam damped by dry friction has been studied The beam is represented partly by its effective modal parameters, obtained from a finite element model. The Coulomb friction law is used and a temporal integration of the dynamic response is performed. A detailed parametric study, highlighting the influence of the static and the dynamic friction coefficients, the viscous damping coefficient, the contact stiffness and the position of the damper along the span, on the dynamic response has been conducted. A better understanding of the damping mechanism by dry friction has been obtained. The numerical results have been compared to experimental results, and a good agreement was found. The results could be applied to a turbine blade with a blade to ground damper.

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