Experimental tests on seismic upgrading techniques for RC...
Transcript of Experimental tests on seismic upgrading techniques for RC...
Experimental tests on seismic upgrading Experimental tests on seismic upgrading techniques for RC buildingstechniques for RC buildings
MarchMarch 3030--31,31, 20072007 -- Prague,Prague, Czech RepublicCzech Republic
FF. M. . M. Mazzolani, Mazzolani, Gaetano Della CorteGaetano Della Corte, , E. Barecchia, M. D’AnielloE. Barecchia, M. D’Aniello
DeptDept. of . of StructuralStructural EngineeringEngineeringUniversity of University of NaplesNaples “Federico II”“Federico II”
The BUILDING (The BUILDING (substructuringsubstructuring))
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
ShapeMemory
Alloy races(SMAB)
Composite Materials(C-FRP)
EccentricBraces
(EB)
Steel Buckling
Restrained Braces(BRB)
Base Isolationwith rubber
bearings(BI)
Lateral Loading Test of the Bare RC Structure
Metal ShearPanels(MSP)
55 6644332211
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
DynamicDynamic IdentificationIdentification TestsTests
Dynamic shaker (vibrodyne) test
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Dynamic Identification TestsDynamic Identification Tests
Falling mass test
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Dynamic Identification TestsDynamic Identification Tests
Impacting hammer test
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Dynamic Identification TestsDynamic Identification Tests
Mode Frequency (Hz) Damping (%)
1 1.44 2.7
2 2.20 3.0
3 4.63 2.5
4 5.56 6.3
5 6.85 2.6
Mode 1 Mode 2 Mode 3
Mode 4 Mode 5
TESTTEST on the bareon the bare RC RC structurestructure
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Direction of
Loading
SECOND FLOOR
GEOMETRY OF THE STRUCTURE
Direction of Loading
General views of the reacting structure
LOADING AND MEASURING DEVICES
Close-up views of the reacting structure with the load jacksDisplacement
measuring devices
TESTTEST on the bareon the bare RC RC structurestructure
Top-story column mechanism
Close-up views of plastic hinges
PHYSICAL TEST RESULTS
TESTTEST on the bareon the bare RC RC structurestructure
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
TESTTEST on the bareon the bare RC RC structurestructure
01020304050607080
0 0.05 0.1 0.15 0.2 0.25 0.3Top Displacement (m)
Bas
e Sh
ear (
kN)
Plastic hinge model (SAP 2000)
Experimental results
Fiber model (OpenSEES)
Composite fiber reinforced materialsComposite fiber reinforced materials
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
General views of the reacting structure
LOADING AND MEASURING DEVICES
Close-up views of the reacting structure with the load jacks
Displacement measuring devices
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Composite fiber reinforced materialsComposite fiber reinforced materials
Global collapse mechanism
Close-up views of plastic hinges at the column bases
PHYSICAL TEST RESULTS: damage pattern
Composite fiber reinforced materialsComposite fiber reinforced materials
Composite fiber reinforced materialsComposite fiber reinforced materialsPHYSICAL TEST RESULTS: damage pattern
Peeling off at a wrong end detail
Cracking of beams in torsion
Local buckling of free length portions of strips
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
-200
-150
-100
-50
0
50
100
150
200
-0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04Top Drift Angle (rad)
Bas
e Sh
ear (
kN)
1.91.9
1.01.0
Composite fiber reinforced materialsComposite fiber reinforced materials
Steel Steel EccentricEccentric BracesBraces (EB)(EB)
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
-700
-500
-300
-100
100
300
500
700
-0.03 -0.02 -0.01 0 0.01 0.02 0.03Average 1st Story Drift Angle (rad)
Bas
e Sh
ear (
kN)
Steel Steel EccentricEccentric BracesBraces (test #1)(test #1)
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
No No capacitycapacity--designdesign criterioncriterion appliedapplied
-700
-500
-300
-100
100
300
500
700
-0.015 -0.01 -0.005 0 0.005 0.01 0.015 0.02Average 1st Story Drift Angle (rad)
Bas
e Sh
ear (
kN)
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
VVjj,,RkRk//VVpp = 1.89= 1.89
Steel Steel EccentricEccentric BracesBraces (test #2)(test #2)
-700
-500
-300
-100
100
300
500
700
-0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03Average 1st Story Drift Angle (rad)
Bas
e sh
ear (
kN)
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
VVjj,,RkRk//VVpp = 2.84= 2.84
Steel Steel EccentricEccentric BracesBraces (test #3)(test #3)
0
100
200
300
400
500
600
700
0 2 4 6 8 10 12
Displacement (cm)
Bas
e Sh
ear (
kN)
Bare RC structure
EB - Test n.1
EB - Test n.3
EB - Test n.2
Steel Steel EccentricEccentric BracesBraces ((comparisoncomparison))
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
8.58.5
5.85.8
7.87.8
1.01.0
Steel BucklingSteel Buckling Restrained Restrained Braces Braces (BRB)(BRB)
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
-500-400-300-200-100
0100200300400500
-0.015 -0.01 -0.005 0 0.005 0.01 0.015 0.02Average 1st story drift angle (rad)
Bas
e sh
ear (
kN)
Core fracture
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Steel BucklingSteel Buckling Restrained Restrained BracesBraces (test #1)(test #1)
-500-400-300-200-100
0100200300400500
-0.02 -0.01 0 0.01 0.02 0.03 0.04 0.05 0.06Average 1st story drift angle (rad)
Bas
e sh
ear (
kN)
Gusset plate buckling
Local failure of the restraining tube
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
End local
Steel BucklingSteel Buckling Restrained Restrained BracesBraces (test #1)(test #1)
0
100
200
300
400
500
0 2 4 6 8 10 12 14 16 18 20 22 24
Average top displacement (cm)
Bas
e Sh
ear (
kN)
Bare RC structure
BRB - Test n.1
BRB - Test n.2
Test interrupted owing to the achievement of the maximum
allowable core excursionTest interrupted owing to the core fracture
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Steel BucklingSteel Buckling Restrained Restrained BracesBraces ((comparisoncomparison))
4.24.2
5.15.1
1.01.0
ComparisonComparison of of resultsresults
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
0
100
200
300
400
500
600
0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25Top Displacement (cm)
Bas
e Sh
ear (
kN)
Bare RC structureC-FRPEB 1EB 2EB 3BRB 1BRB 2
4.24.2
5.15.1
1.01.0
8.58.5
5.85.8
7.87.8
1.91.9 FRP
Bare RC
BRB
EB
Prof. F.M. Mazzolani - UNIVERSITY of NAPLES “FEDERICO II”
Base IsolationBase Isolation
25
-10
-5
0
5
10
15
20
Time32,50 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 27,5 30
0,15
-0,15
-0,1
-0,05
0
0,05
0,1
Time (s)32,50 5 10 15 20 25 30