2010/5/20

E hEnhancementt off Seismic
S i i ResistanceR i toff Buildings
B ildi15-16 March 2010

Taiki Saito
Chief Research Engineer
International Institute of Seismology and Earthquake Engineering,Building Research Institute1Enhancement of seismic resistance of buildings isthe high priority in Peru to reduce the human losses
due to earthquakes. To achieve this objective, we set
the following research subjects:
1. Development of seismic performance model ofbuildings in Peru
2. Development of seismic evaluation andrehabilitation technologies for buildings in Peru
3. Enhancement plan of seismic resistance ofbuildings in Peru
4. Dissemination of knowledge to Latin countries12010/5/20

Development of seismic performancemodel of buildings in Peru Identification of building types
 Study of building damage (in Peru, Chile) Creating database of test results and models
 Conducting structural tests
 Development of performance modelstone

adobe

masonryRC

2

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Creating database of test results and models

Quite a few researches have been done conducting structural
tests of masonry structures around the world to evaluate theseismic resistance capacity. However, the test results andobtained knowledge are not shared among countries.
- Material properties- Failure patterns- Mathematical models- Design equations- etc.
load

load
L1

Height (h)piecemortarload

thickness (t)Specimen for compression test

L2
load
L2  L1

Database for seismic performance ofmasonry structures are quite useful toshare the knowledge and develop
effective technology to enhance seismic
resistance of buildings.

Conducting structural tests
Compression test on
masonry prism

Full scale test of confined masonry house

DiDiagonall
compression test
on masonry prism3

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Flexural and Rocking Failures

Flexural Failure

Rocking Failure

Shear Failures

Sliding Failure

Joint Failure

Diagonal Failure

Out of Plane Failures
Out-of-plane failure tests are very limited since it requires
dynamic loading facility

Tilting table test of Adobe house
in El Salvador, JICA-TAISHIN Project

Shaking table test, Sidney42010/5/20

Development of seismic evaluation andrehabilitation technologies for buildings in Peru Development of seismic screening method of buildings Computer simulation for seismic evaluation
 Development of rehabilitation technologies
 Conducting structural tests to verify the technologies

Seismic Evaluation Standard in Japan
Seismic Structural Index IsI S    C  F  S D  TC (Resistance)

To be strong?

ϕ: story index
SD: irregularity index
T: age index

I ＞0 6
Is＞0.6(Safe)
SeismicIndex
Is＜0.6(Danger)

To be ductile

Existing
Building

F (Ductility)52010/5/20

Computer simulation for seismic evaluation
FEM analysis

DEM analysis

Frame analysis (STERA 3D Software)

Development of rehabilitation technologies

Is = (φ× C×F ) × SD × T
C (Resistance)

Seismic index inJapanese
screening method

Replace brick wall toinfill RC wall

Improve C

Improve C & F
Is＞0.6(Safe)

SeismicIndex
Is＜0.6(Danger)

Retrofitting
by steelbrace

Improve F

Existing
Building

F (Ductility)

Retrofitting by FRP sheet

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Development of rehabilitation technologies

Retrofit using seismic dampers
C (Resistance)

Oil Damper

DamperOILES Co.
http://www.oiles.co.jp

DamperSteel Damper(Safe)(Danger)
Energydissipation byDampers

Existing
Building

F (Ductility)

Kajima Co.
http://www.kajima.co.jp

Many other devices

Development of rehabilitation technologies

Retrofit using seismic isolation
C (Resistance)

Laminated Rubber bearing((Safe))Lead damper(Danger)Steel damper

Existing
Building
F (Ductility)7

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Enhancement plan of seismic resistance ofbuildings in Peru
 Study on specific buildings in Peru Important buildings (church, hospital, school, etc.)
 Historical buildings (world heritage, colonial age, etc.)
 Residential buildings (in urban area)
 Test and analysis of existing buildings
 Non-destructive test such as micro-tremor measurement Sampling test for material strength Computer simulation of seismic performance Proposal of enhancement plan

Protection of world heritage against
earthquakes
Micro tremor measurement
Location of microtremor measurements②④①③⑦

FEM analysis⑧⑤⑥8

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Seismic vulnerability assessment ofLima Centroon 16 March, 2010
 5-year activity plan
 Database Structural test
 Structural analysis
 List of input
 Equipment
 PersonnelPl
 List of output
 Evaluation method Rehabilitation method
 Enhancement plan9