212 Ketter Hall, North Campus, Buffalo, NY 14260

1

• 212 Ketter Hall, North Campus, Buffalo, NY 14260
  
• www.civil.buffalo.edu
• Fax [phone] Tel [phone] x 2400
• Control of Structural Vibrations
• Lecture 5
• Devices and Models (1)
• Instructor
• Andrei M. Reinhorn P.Eng. D.Sc.
• Professor of Structural Engineering

2
Control Devices in Civil Engineering Structures
3
Classification of PED
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
Modeling of Experimental Data
8
(No Transcript)
9
(No Transcript)
10
Viscous and Viscoelastic Devices - Behaviour
Viscous F C (dx/dt)
11
Viscous Fluid Dampers

• Models and implemented Devices

12
Viscous Fluid Damper
13
Viscous Fluid Damper
14
Viscous Fluid Damper
15
Fluid Damper - Taylor Devices
16
Structure with Fluid Dampers
17
Brace with Fluid Damper
18
(No Transcript)
19
Response of Fluid Damper in Frame
20
Fluid Dampers Models with Stiffening
21
Fluid Dampers Models with Stiffening
22
Maxwell Model dependency on frequency
23
Model of fluid damper
24
Other Fluid Dampers Models
25
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
26
Typical response of fluid damper
27
(No Transcript)
28
Solid Viscoelastic Dampers

• Models and Implemented Devices

29
Viscoelastic Dampers
30
Viscoelastic Damper - 3M Corp.
31
Viscoelastic Solid Dampers
32
Viscoelastic Models
33
Viscoelastic Models
34

35
General Viscoelastic Model
36
Extended Viscoelastic Model
37
Viscoelastic Models
38
Shear Storage Modulus
39
Shear Loss Modulus
40
Effectivness vs TemperatureViscoelastic Dampers
41
Effectiveness in SystemViscoelastic Dampers
42
Energy Balance
43
Energy Balance
44
Additional Viscoelastic Dampers
45
Additional Viscoelastic Dampers
46
Design ChartFor Visco-Elastic Dampers
47
Viscous Fluid Wall Dampers
48
Sumitomo Construction Fluid Viscoelastic Wall
49
Viscous Walls -Sumitomo Industries Ltd
50
Independence of Position
51
(No Transcript)
52
(No Transcript)
53
Pot Fluid Damper (GERB) (Huffman,1985)
54
Fluid Viscoelastic Dampers
Gerb Fluid Damper
55
(No Transcript)
56
Hysteretic Dampers

• Models and Implemented Devices

57
(No Transcript)