fig.2.2.1

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1

EUROPEAN COMMISSION

DIRECTORATE
-
GENERAL JRC JOINT
RESEARCH CENTRE

GOVERNMENT OF ROMANIA

MINISTRY OF EDUCATION AND
RESEARCH

JRC Information Day and S&T Workshops

11 May 2006

SITON SOLUTIONS TO INCREASE NEW OR
EXISTING NPP’s RELIABILITY & SAFETY BY
CONTROLLING, LIMITTING AND DAMPING
SHOCKS, VIBRATIONS & SEISMIC MOVEMENTS


V. Serban
1
, A. Panait
1
, I. Prisecaru
2
,

1
SITON
-

Subsidiary of Technology and Engineering for Nuclear Projects

2
UPB
-

University “Politehnica” Bucharest

2

S.I.T.O.N.

1.
GENERAL

PRESENTATION

OF

SITON



SIGMA



UPB

CONSORTIUM

ACHIEVEMENTS


2.
CONTROL,

LIMITATION

&

DAMPING

OF

SHOCKS,

VIBRATIONS

&

SEISMIC

MOVEMENTS

AS

PER

SERB
-
SITON

SOLUTION


3.
DOMAINS

IN

WHICH

SITON



SIGMA

-

UPB

CONSORTIUM

CAN

PARTICIPATE

IN

EUROPEAN

RESEARCH

PROGRAMS

FOR

THE

DEVELOPMENT

OF

NEW

TYPES

OF

ADVANCED

NPP’S


3

S.I.T.O.N.

1.
GENERAL

PRESENTATION

OF

SITON



SIGMA



UPB

CONSORTIUM

ACHIEVEMENTS




SITON



SIGMA



UPB

Consortium

has

conceived,

designed,

manufactured

and

experimented

SERB

devices

with

non
-
linear

elasticity

and

controlled

damping

for

shock,

vibration

and

seismic

movement

control

and

attenuation
.




The

devices

are

capable

to

elastically

overtake

large

permanent

loads

over

which

spatial

dynamic

loads

may

overlap

and

be

damped

.




The

non
-
linear

behavior

of

a

device

is

geometric

type,

given

by

the

modification

of

the

internal

geometry

of

the

device

structure

function

of

the

device

distortion
.




The

device

allows

the

displacements

due

to

thermal

expansions,

with

pre
-
set

reaction

forces
.




The

stiffness

and

damping

characteristics

of

the

device

are

independent

of

the

temperature

variation

within

very

large

ranges,

from

-
50

to

+
350

degrees

Celsius

in

case

of

common

devices
.




4

S.I.T.O.N.



The

device

can

be

installed

in

high

radiation

areas

due

to

the

component

materials
.

The

integrated

fast

neutron

flux

upto

which

the

performances

of

the

device

can

be

guaranteed,

is

2
x
10
19

neutrons/cm
2
.




The

devices

can

be

made

in

very

small

sizes

(
60

mm

diameter

and

20

mm

high)

having

the

stiffness

and

damping

characteristic

pre
-
set

for

large

operation

ranges
.




The

device

damping

capacity

is

practically

independent

from

the

dynamic

action

frequency
.





By

now,

the

new

devices

have

been

employed
:



to

isolate

equipment

which

generate

shocks

and

vibrations
;



to

reduce

the

stress

and

vibrations

conditions

in

pipe

networks
;



to

control,

limit

and

damp

the

building

seismic

movements
.


5

S.I.T.O.N.

2.
CONTROL,

LIMITATION

&

DAMPING

OF

SHOCKS,

VIBRATIONS

&

SEISMIC

MOVEMENTS

AS

PER

SERB
-
SITON

SOLUTION



The

first

application

related

to

shock

&

vibration

reduction

was

in

the

year

2003
.

It

was

aimed

to

isolate

a

1250
Kg

forging

hammer

and

the

inlets

and

outlets

pressurized

air

pipe

[
2
]
.





The

next

solution

was

to

reduce

the

vibrations

in

the

pipe

networks
.




At

present,

a

ground
-
floor

and

5

-

storey

building

with

reinforced

concrete

frame

structure

is

strengthened

by

SERB

devices

now

in

progress

of

application
.




SERB

supports

&

devices

are

certified

in

Romania

by

TECHNICAL

AGREMENT

016
-
03
/
144
-
2005

[
3
]
.



6

S.I.T.O.N.

Fig. 2.1.1. SERB 1 support testing.

Fig. 2.1.2.
SERB 3 support. Elongation


compression testing.

Fig. 2.1.3. SERB 3 support


balancing testing.

7

S.I.T.O.N.

Fig. 2.1.4. SERB 1 support. Force
-

displacement characteristics.
Damping 27,8%. Prestress force 1500
daN.

Fig. 2.1.5. SERB 3


support.
Force
-

distortion characteristics.

Damping 23,2%.

Fig
.
2.1.6. SERB 3


support. Force
-

distortion characteristics.

Damping 25,24%.



Figs
.

2
.
1
.
1



2
.
1
.
6

illustrate

the

experimental

testing

developed

on

SERB

prototypes

supports

for

pipe

networks

and

experimental

diagrams
.


8

S.I.T.O.N.



Fig
.

2
.
1
.
7

illustrates

installed

support

and

fig

2
.
1
.
8

illustrates

the

effect

of

the

support

on

the

pipe

PL
1056
.



Fig. 2.1.7. SERB 3 support. Setting pipe
PL1056 .

Fig. 2.1.8. Fourier spectra vibration
displacement before & after SERB
installation.

9

S.I.T.O.N.



To

reduce

the

shocks

&

vibrations

for

forging

hammers

at

Tool

&

Devices

Factory

(IUS



Brasov,

Romania)

SERB
-
SITON

isolation

solution

was

applied

in

two

alternatives
.


A.
As

per

the

Constructive

Alternative

2003
,

6

boxes

symmetrically

arranged

were

installed

(fig
.
2
.
2
.
1
)

each

having

4

SERB
-
194
C

supports

(fig

2
.
2
.
2
)
.


Fig.2.2.1. CM1250
foundation SERB
-
194
-
C support

Fig.2.2.2. SERB
-
194C
support type.


Fig.2.2.3. Hysteresis
curves for SERB
-
194
-
C
support.

Fig.2.2.4. Variation of
stiffness for SERB
-

194C

10

S.I.T.O.N.

SIMULTANEOUS MESUREMENTS ON THE FOUNDATION VAT AND
AT 5M AWAY FROM CM1250 FOUNDATION

Fig. 2.2.5.
Wave shape recorded on the
foundation vat and the spectral density
on the old location in point 1’

Fig. 2.2.6.
Wave shape recorded on the
foundation vat and the spectral density on the
new location in point 1

11

S.I.T.O.N.

B.
Isolation

alternative

2005

is

different

from

isolation

alternative

2003

by

that

the

forging

hammer

bed

plate

support

is

resting

on

5

boxes

(fig
.

2
.
2
.
7
)
.

One

box

is

made

up

of

one

SERB
-
375
C

device

see

fig
.

2
.
2
.
7



2
.
2
.
12
.

Fig. 2.2.7. CM1250
foundation as per SERB
-
SITON solution 2005

Fig. 2.2.8. Hysteresis
characteristic for
SERB
-
375C.

Fig. 2.2.9. Bed plate
installation at CM1250
solution 2005

12

S.I.T.O.N.

Fig. 2.2.10. Detail of SERB
-
375C
boxes installed under the bed plate


Fig. 2.2.11. Time history on
foundation and bed plate

Fig. 2.2.12. Time history acceleration
on vat and bed plate

13

S.I.T.O.N.



SERB
-
SITON

isolation

solution

is

highly

efficient

because

the

average

isolation

coefficient

experimentally

obtained,

is

97
,
6
%

for

shocks

generated

by

the

operation

of

the

forging

hammer

(isolation

alternative

2005
)

as

per

table

2
.
1
.


Table
2
.1

No.
Crt.

Bed plate (location 1)

a
1
, m/s
2

Foundation (location 2)

a
2
, m/s
2

A = a
1
/a
2

T = a
2
/a
1
%

I =

1
-
T

%

1

6,9

0,185

37,30

2,68

97,31

2

3,4

0,067

50,75

1,97

98,03

3

3,0

0,071

42,30

2,36

97,63

Average value

97,65


14

S.I.T.O.N.



Washer

type

SERB

device

(see

fig
.

2
.
2
.
13



2
.
2
.
14
)

can

be

used

to

isolate

equipment

&

pipe

networks
.


Fig. 2.2.13.1SERB
-
BS washer type device

Fig. 2.2.14. SERB
-
BS washer type device.
(e. g. pipe supports or equipment slabs
connected to structures)

15

S.I.T.O.N.

Reduction

of

shocks,

vibrations

and

seismic

movements

at

buildings





Here

below

is

a

presentation

of

two

alternatives

of

SERB
-
SITON

solution

for

reducing

shocks,

vibrations

and

seismic

movements

at

buildings
.

The

alternative

solutions

my

be

applied

both

for

new

buildings

and

for

strengthening

the

old

buildings

to

make

them

withstand

severe

future

seismic

events
.




ALTERNATIVE

1
-

Building

Isolation




For

buildings,

usually

massive,

the

strengthening

solution

consists

in

making

some

openings

in

the

basement

or

ground

floor

walls

of

the

building

(see

fig
.

2
.
3
.
1



2
.
3
.
4
)

located

at

4

m

to

6

m

and

about

l

m

high

and

1
.
2

m

wide
.


16

S.I.T.O.N.



j'
Fig. 2.3.1. Building isolation
-

stage 1.

Fig. 2.3.2. Building isolation
-

stage 2.

Fig. 2.3.3. Building isolation


stage 3.

Fig. 2.3.4. Building isolation
-

stage 4.


17

S.I.T.O.N.



Fig
.

2
.
3
.
6



2
.
3
.
7

illustrate

the

force
-
displacement

characteristic

for

seismic

movements

on

vertical

direction

and

vertical

and

horizontal

direction,

respectively
.

Fig. 2.3.5. Dynamic testing of a SERB
-
I
device element subject to vertical and
horizontal dynamic loads applied
simultaneously.

Fig. 2.3.6. Force

vertical characteristics
SERB
-
I device Relative damping 46,1%.

Fig. 2.3.7. Force
-

horizontal distortion
characteristic for a SERB
-
I device element with a
permanent vertical load of 100 KN

18

S.I.T.O.N.



For

the

seismic

isolation

of

buildings,

over

which

dynamic

loads

on

three

directions

may

overlap,

device

box

0
.
5

x

1
.
2

x

0
.
7

m

only

one

may

be

used
.

The

device

lateral

displacements

are

20
-
30

cm

or

even

larger

and

are

capable

to

overtake

static

and

dynamic

loads

upto

2000

kN
.


ALTERNATIVE

2



Building

Distortion

Control
.





The

strengthening

solution

consists

in

the

insertion

of

some

SERB
-
B

mechanical

devices

into

the

flexible

building

structure

(usually

steel

frames

or

reinforced

concrete)
.




The

devices

are

installed

in

the

telescopic

braces

into

the

walls

by

means

of

which

the

relative

level

distortions

are

controlled
.

The

telescopic

braces

allow

a

relative

level

displacement

of

0
.
3
%

-

0
.
5
%

of

the

storey

hight

(function

of

the

building

type)

so

that

an

overload

of

the

beams

and

columns

should

not

occur

but

for

the

entire

building

as

an

assembly,

a

low

transfer

of

the

seismic

energy

to

the

building,

is

resulting
.

19

S.I.T.O.N.


Fig. 2.3.8. SERB
-
B devices for
control, limiting and damping relative
building distortion.



Fig. 2.3.9. SERB
-
B
-
194 device
experimental testing.


-8
-6
-4
-2
0
2
4
6
8
10
x 10
-3
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
x 10
5
Fig. 2.3.10. SERB
-
B
-
194. Force


distortion. Damping 43,3%.


-12
-10
-8
-6
-4
-2
0
2
4
6
x 10
-3
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
x 10
5
Fig. 2.3.11. SERB
-
B
-
194. Force


distortion Hysteresis loop. Prestressing
force 0 and 10 kN. Damping 41,9%

20

S.I.T.O.N.

Fig. 2.3.12 SERB
-
B experimental testing and Force


distortion Hysteresis loop
-
UTCB Lab

21

S.I.T.O.N.

3.
DOMAINS

IN

WHICH

SITON



SIGMA

-

UPB

CONSORTIUM

CAN

PARTICIPATE

IN

EUROPEAN

RESEARCH

PROGRAMS

FOR

THE

DEVELOPMENT

OF

NEW

TYPES

OF

ADVANCED

NPP’S


a.
New

solution

for

seismic

isolation

of

the

integrated

nuclear

building

as

to

a

the

general

basement
;

b.
Solution

for

pipe

network

anchoring

which

allow

displacements

due

to

thermal

expansion,

attenuate

shocks

and

vibrations

and

minimize

load

due

to

the

earthquakes
;

c.
Solution

to

reduce

shocks

and

vibrations

at

equipment

due

to

eccentric

mass

or

misalignment
;

d.
Isolation

of

electric

and

instrumentation

cabinets

or

of

sensitive

equipment

installed

on

a

common

platform

against

shocks,

vibrations

and

seismic

movements
.



22

S.I.T.O.N.

For

further

information,

please

contact

PhD

Viorel

Serban

phone

mobil
:

+
40
-
722
.
615
.
672
,

phone

+
40
-
21
.
404
.
60
.
06
,

fax
:

+
40
-
21
-
457
.
44
.
31
,

e
-
mail
:

serbanv@router
.
citon
.
ro
;

serbv@rdslink
.
ro
.



Bibliography
:



[
1
]

Serban

Viorel

Patent

no
.

119845
/
29
.
04
.
2005

“Sandwich

structure,

device

including

the

sandwich

structure

and

device

network

for

taking

over

and

damping

the

loads

for

structure

behavior

control”
;

[
2
]

Serban

Viorel,

“Damping

of

Vibrations

generated

by

the

CM

1250

kgf

forging

hammer,

located

in

Forging

Shop

SC

IUS

SA

Brasov,

Romania”,

Contract

SITON

nr
.

209
/
17
.
07
.
2003
.

[
3
]Technical

Agreement

016
-
03
/
144
-
2005
.

Permanent

Technical

Council

for

Buildings,

Bucharest,

Romania
.