212 Ketter Hall, North Campus, Buffalo, NY Fax: Tel: x 2400 Control of Structural Vibrations Lecture #5 Devices and Models (1) Instructor: Andrei M. Reinhorn P.Eng. D.Sc. Professor of Structural Engineering

Control Devices in Civil Engineering Structures

Classification of PED

Modeling of Experimental Data

Viscous and Viscoelastic Devices - Behaviour Viscous: F = C (dx/dt)

Viscous Fluid Dampers  Models and implemented Devices

Viscous Fluid Damper

Fluid Damper - Taylor Devices

Structure with Fluid Dampers

Brace with Fluid Damper

Response of Fluid Damper in Frame

Fluid Dampers Models with Stiffening

or

Maxwell Model dependency on frequency

Model of fluid damper

Other Fluid Dampers Models

Fluid Dampers Models Solution of fluid dampers modeled as fractional derivatives is done in the frequency domain since derivatives are product of the function by the argument at the power of order of derivative (approximately) Makris, 1990

Typical response of fluid damper

Solid Viscoelastic Dampers  Models and Implemented Devices

Viscoelastic Dampers

Viscoelastic Damper - 3M Corp.

Viscoelastic Solid Dampers

Viscoelastic Models

General Viscoelastic Model

Extended Viscoelastic Model

Viscoelastic Models

Shear Storage Modulus

Shear Loss Modulus

Effectivness vs Temperature Viscoelastic Dampers

Effectiveness in System Viscoelastic Dampers

Energy Balance

Additional Viscoelastic Dampers

Design Chart For Visco- Elastic Dampers

Viscous Fluid Wall Dampers

Sumitomo Construction Fluid Viscoelastic Wall

Viscous Walls -Sumitomo Industries Ltd

Independence of Position

Pot Fluid Damper (GERB) (Huffman,1985)

Fluid Viscoelastic Dampers Gerb Fluid Damper

Hysteretic Dampers  Models and Implemented Devices