securing structural reinforcements seismic retrofitting
TRANSCRIPT
TECHNOLOGY News
DUCTILE MICROCONCRETES with High Fracture Energy and reaching fast or very fast Structural Performance
HPFRC - High Performance Fibre Reinforced Concretes
UHPFRCC - Ultra High Performance Fibre Reinforced Cementitious Composites
June 2013
High Performance Innovative Products
Securing
Structural reinforcements
Seismic retrofitting
Fire-resistant
Anti-corrosion
Innovative Products - Assistance “from Project to Jobsite”
Also following to the D.P.R. of June 6th 2012 and to the Guide Lines of June 19th 2012 after the earthquake in Emilia “Working Team Practicability of Seismic
Industrial Buildings” Tecnochem Italiana proposes:
REFOR-tec® specific System
For every Project requiring Structural Reinforcement and Seismic retrofitting:
- Low thickness jacketing (15-40 mm) without reinforcement, on reinforced concrete structures: PILLARS - FOUNDATIONS - BEAMS - NODES - WALLS
-Low thickness collaborating layer (15-40 mm) on floors in : CLAY-CEMENT,WOOD, BEAMS/BRICKS, STEEL PANELS, others.
-Combined system micro-concrete HPFRC/UHPFRCC with joints and connections 'ad hoc':
Deformation energy/ Fracture energy / Ductility /
Dissipation / Dynamic resistance
- Combined system of structural reinforcement
HPFRC/UHPFRCC (REFOR-tec®) and Composite materials /Carbon Fibre (VHDRS CarFib® also
protected with heat shields)
- Dynamic efficient 'DUCTILE' joints and connections
REFOR-tec® product range UHPFRCC (Ultra High Performance Fibre Reinforced
Cementitious Composites) represents an exceptional evolution in capacity and application fields
of (High Performance Fibre Reinforced Concretes). The products part of this product range unite a range of products with increased mechanical and compression resistances (100 to 280 MPa) and flexion (>25 to 80 MPa) with optimal ductility values (Fracture energy from 15.000 to 35.000 N/m) and other exceptional performance values.
REFOR-tec® systems : more than 18 years of R&D, Innovation,
Experimentation, Project development, Applications
Performance evidence of REFOR-tec®
as COLLABORATING LAYER ON FLOORS
1° International price in the category “Special Projects”
Award of Excellence U.S.A., November 2012 :
see Newsletter REFOR-tec® FLOORS on the page “NEWS” on our website www.tecnochem.it
In case of using REFOR-tec® GF5 ST-HS as collaborating layer: the balance of the tensile forces in the two directions is guaranteed due to the tensile strength of the material.
mkNmmm
kNF Rt /),(
,750150015000
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mkNmmm
kNF Rt /),(
,150030015000
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mkNmmm
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� increase >200% of Mrd - Moment resistant design final !!!
(REFOR-tec® thickness 15 mm)
(REFOR-tec® thickness 30 mm)
(REFOR-tec® thickness 50 mm)
Evidence of performance with HINGE TEST Of Structural reinforcement and seismic retrofitting
Of jacketing with REFOR-tec® on PILARS/NODES
Evidence of performance of jacketing with
REFOR-tec® ON BEAMS
See Presentations at Seminars: fib Symposium Prague June 2011 and ACI/Canmet Conference Prague Oct. 2012
see Presentations on the “NEWSLETTER” page of our website www.tecnochem.it Possible doubling of the ultimate load of beams under bending by applying 40 mm Refor-tec®. Increased stiffness with reduction of the arrow up to 12 times (comparable to a pre-compression).
Publication in the U.S.A. I.C.R.I magazine– International Concrete Repair Institute – o the Project
Development, Testing and Application of the
Structural reinforcement and Seismic Retrofitting of the Zagarolo (Rome) school
building. The testing, which has been
performed by the University of Bergamo
(Italy), has resulted in the approval by the Superior Board of Public Works.
see Article “High-Performance Fibre-Reinforced Concrete Jacketing in a Seismic Retrofitting Application” on the “NEWS” page on our website www.tecnochem.it
Prequalification made with the University of Liège
Of the FIRE RESISTANCE (800÷÷÷÷1000°C in the oven) on
BEAMS IN R.C. - L = 5 meter , 25 MPa ,
with jacketing REFOR-tec®, thickness 40 mm,
under constant load of 300 KN
for 130 minutes without beam failure
and a perfect behaviour of the jacket REFOR-tec®
� Maximum fire-resistance : Certificate by Liège University EF/FH/1231
Temperature of the oven: 800°C after 20 minutes; 1000°C after 80 minutes
Maximum deflection 75 mm after 130 minutes.
Partial elasticreturn after unloading to 42 mm
Without spalling
Without delamination
Distributed micro-cracks
Perfect behaviour on adhesion of the REFOR-tec® jacket to the concrete
Perfect integrity of the REFOR-tec® jacket
300 KN constant load on the beam
Performance evidence of
REFOR-tec® jacket Compared to
FRP – Carbon fibre On PILLARS in R.C.
pillar as such
pillar reinforced with FRP textile in carbon fibre pillar reinforced with REFOR-tec® jacket
As a result of experimental tests, it is well known that the structural reinforcement
with Carbon Fibre Fabrics for wrapping of columns allows a limited increase in the
values of Axial Load and Resistance Moment of max. +15%.
Compared to the considerable increase with a jacket of REFOR-tec® :
with 3 cm thickness +238% Axial Load, +256% Resistance Moment
with 4 cm thickness +331% Axial Load, +362% Resistance Moment
State of facts :
Beam 30x30 cm
Concrete c 20/25
Steel 3+3 diam 16 FeB 44k
_______ Beam as such
________ BEAM REINFORCED WITH
FRP – CARBON FIBRE FABRIC -
MODULUS OF ELASTICITY 240 GPa -
Weight 400 g/m2
________ BEAM REINFORCED WITH
MICRO-CONCRETE UHPFRCC - REFOR-
TEC®
– JACKETING THICKNESS 3 cm, NO
REINFORCEMENT
Axial load Moment of Resistance
Beam 1300 KN 80 KNm
+ FRP 1500 KN 90 KNm
+ REFOR-tec® 4400 KN 285 KNm
State of facts :
Beam 30x30 cm
Concrete c 20/25
Steel 3+3 diam 16 FeB 44k
_______ Beam as such
________ BEAM REINFORCED WITH
FRP – CARBON FIBRE FABRIC -
MODULUS OF ELASTICITY 240 GPa -
Weight 400 g/m2
________ BEAM REINFORCED WITH
MICRO-CONCRETE UHPFRCC - REFOR-
TEC®
– JACKETING THICKNESS 4 cm, NO
REINFORCEMENT
Axial Load Moment of Resistance
Beam 1300 KN 80 KNm
+ FRP 1500 KN 90 KNm
+ REFOR-tec® 5600 KN 370 KNm
Compared performance tests
REFOR-tec® / FRP
Of the same DOMAIN M-N
Transferred on Histogram
PILLAR in R.C.
→ PILLAR*
→ pillar * + FRP (240 GPa, 300-400 g/m2)
→ pillar * + REFOR-tec® GF5 / ST-HS thickness 3 cm (un-reinforced jacketing )
→ pillar * + REFOR-tec® GF5 / ST-HS thickness 4 cm (un-reinforced jacketing)
Note*: C 20/25 reinforced 3+3 ø16FeB 44 K
AX
IAL
LO
AD
RE
RS
IST
AN
CE
MO
ME
NT
Comparison of the architectural and performance impact of:
Pillar in R.C.
Pillar reinforced with steel jacket
Pillar reinforced with jacket with R.C. concrete
Pillar reinforced with REFOR-tec® 40 mm jacket Courtesy of Eng. Oreste Mammana- Consultant for the Design of Structural Works of Seismic
Improvement of the Castel di Sangro Hospital (L’Aquila)
-------------------------------------------------------------------------------------------------------------------------
Extract from the thesis: ”The use of fiber-reinforced concretes for the seismic retrofitting of existing buioldings” - Supervisor Prof. Eng. Raffaele Landolfo – Teachers co-: Arch. Ornella Iuorio; Eng. Oreste
Mammana - Candidate Arch. Silvia Costanzo - University of Naples Federico II
PERFORMANCE COMPARISON
Interaction domain N-M for various types of reinforcement - nominal values according property of the materials
M (KNm)
N (KN)
ARCHITECTURAL IMPACT
Jacket inC.A.
Jacket in steel
Jacket in REFOR-tec®
• Significant increase in the geometry
• Necessary to plaster
• Light increase in the geometry
• Necessary to apply fire protection
• Necessary to plaster
• No increase in the geometry of the element
• Only need for finishing layer (paint)
• Texture
Axial load Resistance Moment
Pillar
2000 KN
170 KNm
With steel jacket; extra thickness 10 mm
3000 KN
350 KNm
With jacket in R.C., extra thickness 65 mm
7000 KN
700 KNm
with REFOR-tec® jacket; thickness 40 mm, no extra thickness(thickness equal to what is removed by scarification)
10.300 KN
870 KNm
Performance evidence of
Jacket with REFOR-tec® not reinforced Compared to
Jacket in R.C. of 80 MPa
Certificate from the Milan Politecnico "Cyclic tests of bending beam specimens in reinforced concrete pillar
Comparison of two different structural reinforcement systems through experimental tests "
Performance comparison after test “hinge” with axial load 60 KN :
DISPLACEMENT 8 mm 16 mm 32 mm 48 mm 64 mm
DRIFT 0,5% 1% 2% 3% 4%
Performance comparison between PILLAR Nr.1 and PILLAR Nr.2
-200
-150
-100
-50
0
50
100
150
200
250
-80 -60 -40 -20 0 20 40 60 80
incamiciatura armata 12FI14
REFORTEC
PILLAR Nr. 1 Jacketing 40 mm non reinforced with REFOR-tec® GF5 /ST-HS
PILLAR Nr. 2 Jacketing 50 mm reinforced With grout 80 MPa
On the pillar no. 1 the
program has been completed with all
the displacement
involved: 8-16-32-48-
64 mm. Pillar
perfectly intact, it
maintains its structural capacity*,
only some micro-crack.
The pillar no. 2 shows the beginning of spalling of the concrete already with displacement of 16 mm
and with 1% of drift. With 32 mm displacement and
2% of drift, with probable load of 170 KN, the
concrete shows widespread cracking, crushing and
spalling, tensile failure of some bars with loss of its structural capabilities*.
Note*: 93% resistance remains in respect to the original maximal resistance.
Note * : 53 of the resistance finally remains in respect to the maximal original resistance.
Disintegrated beam Integral beam alter the hinge test, with displacement up to 64 mm.
Since the Regulation 3274 dated May 2003, Tecnochem Italiana Promotes, Assists and Applies REFOR-tec® systems for the Structural Reinforcement and
Seismic Retrofitting of structures in R.C.
Post-earthquake in Emilia shows the great pre-seismic solutions in evidence
with REFOR-tec® ductile systems and Combined systems REFOR-tec® and Steel
for Iso-Static Solutions for Industrial Buildings
Pre-seismic REFOR-tec® solutions for the
Seismic retrofitting of Isostatic Structures of
industrial constructions
Collapsed structure after seismic event
0,10-0,15 g SEISMIC CLASS 3
Tecnochem Italiana promotes, assists in projects
and applies the Ductile System REFOR - tec®
since
before the Ordinance 3274-Gazzetta Ufficiale n.
72, 8 May 2003 and subsequent publications in
our Periodic Technical – Scientific Paper
TECNOlogica n°5 May 2005 entitled: “Seismicity in
the Territory Italy – Standards and Projected
Evolutions – Can ductility be designed?” ….and
following to the Decree of June 6, 2012 and the
Guidelines of June 19, 2012.
After Emilia Earthquake.
18 years of R&D - Hundreds of Projects and Applications realised: Structural Reinforcement – Seismic retrofitting - Engineering
BEAM jacket PILLAR jacket Jacket PILLAR-FOUNDATION
Collaborating layer on FLOORS Connections and joints Jacket WALL-FLOOR
Experimentation with dynamic loads as seismic simulations
- PILLAR-FOUNDATION
Experimentation with dynamic loads as seismic simulations - NODES BEAMS-PILLARS
SHAPE ENGINEERING
Request for information or project assistance :
U.A.P.P. – TECNOCHEM Engineering Office - e-mail : [email protected]
TECNOCHEM ITALIANA SPA - Via Sorte 2/4 - 24030 Barzana (BG) www.tecnochem.it - [email protected]
Pls consult our web-site www.tecnochem.it