In this paper, a base isolator called a multiple direction optimized-friction pendulum system (Multiple DO-FPS) with numerous sliding interfaces is proposed. To understand the mechanical behavior of the Multiple DO-FPS isolator under multidirectional excitations, an analytical model called the multiple yield and bounding surfaces model is proposed. On the basis of the derived mathematical formulations for simulation of the characteristics of the Multiple DO-FPS isolation bearing, it is revealed that the natural period and damping effect of the Multiple DO-FPS isolator are a function of the sliding displacement and sliding direction. By virtue of the proposed model, the phenomena of the sliding motions of the Multiple DO-FPS isolator with numerous sliding interfaces subjected to multidirectional excitations can be understood in a simple manner. The analytical results indicate that the natural frequency and damping effect of the Multiple DO-FPS isolator with numerous concave sliding interfaces change continually during earthquakes and are controllable through appropriate designs.

References

References
1.
Zayas
,
V. A.
,
Low
,
S. S.
, and
Mahin
,
S. A.
,1987,“
The FPS Earthquake Resisting System Report
,” EERC Technical Report No. UBC/EERC-87/01.
2.
Al-Hussaini
,
T. M.
,
Zayas
,
V. A.
, and
Constantinou
,
M. C.
, 1994, “
Seismic Isolation of Multi-Story Frame Structures Using Spherical Sliding Isolation Systems
,” National Center for Earthquake Engineering Research, State University of New York at Buffalo, Technical Report No. NCEER-94-0007.
3.
Tsai
,
C. S.
, 1997, “
Finite Element Formulations for Friction Pendulum Isolation Bearings
,”
Int. J. Numer. Methods Eng.
,
40
, pp.
29
49
.
4.
Jangid
,
R. S.
, 2005, “
Optimum Friction Pendulum System for Near-Fault Motions
,”
Eng. Struct.
,
7
, pp.
349
359
.
5.
Tsai
,
C. S.
,
Chiang
,
T. C.
, and
Chen
,
B. J.
, 2003, “
Finite Element Formulations and Theoretical Study for Variable Curvature Friction Pendulum System
,”
Eng. Struct.
,
25
, pp.
1719
1730
.
6.
Tsai
,
C. S.
,
Chiang
,
T. C.
, and
Chen
,
B. J.
, 2003, “
Shaking Table Tests of a Full Scale Steel Structure Isolated With MFPS
,”
The ASME Pressure Vessels and Piping Conference, Seismic Engineering
,
J. C.
Chen
, ed., July, Cleveland, OH, Vol.,
466
, pp.
41
47
.
7.
Tsai
,
C. S.
,
Chen
,
B. J.
,
Pong
,
W. S.
, and
Chiang
,
T. C.
, 2004, “
Interactive Behavior of Structures With Multiple Friction Pendulum Isolation System and Unbounded Foundations
,”
Adv. Struct. Eng.
,
7
(
6
), pp.
539
551
.
8.
Tsai
,
C. S.
,
Chiang
,
T. C.
, and
Chen
,
B. J.
, 2005, “
Experimental Evaluation Piecewise Exact Solution for Predicting Seismic Responses of Spherical Sliding Type Isolated Structures
,”
Earthquake Eng. Struct. Dyn.
,
34
(
9
), pp.
1027
1046
.
9.
Tsai
,
C. S.
,
Chen
,
W. S.
,
Chiang
,
T. C.
, and
Chen
,
B. J.
, 2006, “
Component and Shaking Table Tests for Full-scale Multiple Friction Pendulum System
,”
Earthquake Eng. Struct. Dyn.
,
35
(
11
), pp.
1653
1675
.
10.
Fenz
,
D. M.
, and
Constantinou
,
M. C.
, 2006, “
Behaviour of the Double Concave Friction Pendulum Bearing
,”
Earthquake Eng. Struct. Dyn.
,
35
(
11
), pp.
1403
1424
.
11.
Kim
,
Y. S.
, and
Yun
,
C. B.
, 2007, “
Seismic Response Characteristics of Bridges Using Double Concave Friction Pendulum Bearings With Tri-linear Behavior
,”
Eng. Struct.
,
29
(
11
), pp.
3082
3093
.
12.
Tsai
,
C. S.
, 2003, “
Improved Structures of Base Isolation Systems
,” Taiwan Patent No. 207126, Publication Number: 00542278, Publication Date: July 11, Application Number: 091210175, Filing Date: July 4, 2002 (in Chinese)
13.
Tsai
,
C. S.
,
Lu
,
P. C.
,
Chen
,
W. S.
,
Chiang
,
T. C.
,
Yang
,
C. T.
, and
Lin
,
Y. C.
, 2008, “
Finite Element Formulation and Shaking Table Tests of Direction-Optimized Friction Pendulum System
,”
Eng. Struct.
,
30
, pp.
2321
2329
.
14.
Tsai
,
C. S.
,
Lin
,
Y. C.
, and
Su
,
H. C.
, 2010, “
Characterization and Modeling of Multiple Friction Pendulum Isolation System With Numerous Sliding Interfaces
,”
Earthquake Eng. Struct. Dyn.
,
39
, pp.
1463
1491
.
15.
Fenz
,
D. M.
, and
Constantinou
,
M. C.
, 2008, “
Spherical Sliding Isolation Bearings With Adaptive Behavior-Theory
,”
Earthquake Eng. Struct. Dyn.
,
37
(
2
), pp.
168
183
.
16.
Tsai
,
C. S.
,
Lin
,
Y. C.
, and
Su
,
H. C.
, 2009, “
Multiple Yield and Bounding Surfaces Model for Analysis of Multiple Friction Pendulum System
,”
In the 2009 ASME Pressure Vessels and Piping Conference
,
Seismic Engineering, Paper No. PVP2009-77307
.
You do not currently have access to this content.