* Email: khoshnud@aut.ac.ir

*

IBCNEHRP

][

][

Fabio

Mazza Alfonso Vulcano][

””

Rubber Isolator

SAP2000][

AISC-LRFD

type T(s) eff K1

(Ton/cm)

α=

12

KK

Fy

(Ton)

Keff

(Ton/cm)

1 2 20% 0.067 W 0.1 0.14 W 0.01 W

2 2 15% 0.076 W 0.1 0.11 W 0.01 W

3 3 20% 0.03 W 0.1 0.065 W 0.004 W

1k2k

yF

””

Park, Wen, Ang ][

Nagarajaiah, Reinhorn, Constantinou

Iso 1

Iso 6 Iso 7

Iso 4

222 )1( ZFuy

FF y

y

333 )1( ZFuy

FF y

y

yF

y

2F3F

2Z3Z

2Z3Z

3

2

33233232

33322222

3

2

3

2 .)()(

)()( .

u

u

ZuSignZZuSignZZ

ZuSignZZZuSignZ

u

uA

Z

ZY

A,,

PGA

(g)

PGA

(g)

PGA

(g)

Name Year 1 (L) 2 (T) 3(V) V/L

Imperial

valley 1979 0.48 0.352 0.707 1.47

Bam 2003 0.815 0.649 1.008 1.24

Northridge 1994 0.843 0.604 0.535 0.63

LV

Iso 3

Iso 3Iso 3

Iso 3

Iso 1

Iso 1

Iso 1Iso 1

Iso 2

Iso 2

Iso 2

Iso 2

0

50

100

150

200

250

300

350

400

0% 5% 10% 15% 20% 25% 30% 35%

ex

AX

IAL

(T

ON

)

Iso 3

Iso 1

Iso 2

2

2

2

2

33

33

0

20

40

60

80

100

120

140

160

0% 5% 10% 15% 20% 25% 30% 35%

ex

AX

IAL

(T

ON

)

2 3

2

2

2

2

3

3

33

0

20

40

60

80

100

120

140

160

180

0% 5% 10% 15% 20% 25% 30% 35%ex

AX

IAL

(T

ON

)

2 3

.

0.0

20.0

40.0

60.0

80.0

100.0

Err

or%

0% 10% 20% 30%

ex

Sylmar

Elcentro

Bam

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

Err

or%

0% 10% 20% 30%

ex

Sylmar

Elcentro

Bam

LV

-40000

-30000

-20000

-10000

0

10000

20000

30000

-0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2

Displacement(m)

Forc

e (

Kgf)

ISO 1

ISO 2

ISO 3

ex=

-40000

-30000

-20000

-10000

0

10000

20000

30000

-0.25 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15

Displacement (m)

Forc

e(

Kgf)

ISO 1

ISO 2

ISO 3

ex=

0

2000

4000

6000

8000

0% 5% 10% 15% 20% 25% 30% 35%ex %

EL

oo

p (kgf.m

)

iso 1 iso2 iso3

Eloop

LoopE

-50000

0

50000

100000

150000

200000

250000

0 10 20 30 40 50

Time (sec)

En

erg

y

0%

10%

20%

30%

-20000

0

20000

40000

60000

80000

100000

120000

140000

160000

180000

0 10 20 30 40 50

Time(sec)

En

erg

y

0%10%20%30%

1 - Shakib, H. and Fuladgar. (2003). “A Response of pure-friction sliding structures to three components of

earthquake excitation.” J. Computers and structures, VOL. 81, PP. 189–196.

2 - Shakib, H. and Fuladgar. (2003).“Effect of vertical component of earthquake on the response of pure-friction

base-isolated asymmetric buildings.” J. Engineering structures, VOL. 25, PP. 1841–1850.

3 - Mazza, F and Vulcano, A (2006). “Nonlinear response of base-isolated buildings under near-fault ground

motions.” Proc.,13h European Conference on Earthquake Engineering and Seismology, Switzerland, PP. 481,

3-8 September.

4 - Computer and Structures, (1999). Inc, SAP User’s Manual, Berkeley, California, USA.

5 - Park, Y. L., Wen, Y. K. and Ang, A. H. (1986). “Random vibration of hysteretic system under bi-directional

ground motions.” J. Earthquake Engineering and Structural Dynamics, Vol. 14.

6 - Nagrajaiah, S., Reinhorn, A. M. and Constantinou, M. C. (1993). “Torsion in base isolated structures with

elastomeric isolation system.” J. Structural Engineering, ASCE, Vol. 119, No. 10.

1 - Local Uplift

2 - Isolator unit