Y. N A K A N O L A B .

[Safer Buildings against Earthquakes and Tsunamis]

Department of Fundamental Engineering

http://s ismo. i is .u -tokyo.ac. jp/

Earthquake Engineer ing & Structural Dynamics

What happens to bui ld ings by earthquakes and tsunamis? Be-202

Department of Architecture

Seismic Performance Evaluation of Reinforced Concrete Building Structures MEMBERS: Evaluation of Residual Axial Capacity of Shear Damaged RC Columns SUB-ASSEMBLAGE: Out-of-plane Behavior Evaluation of Masonry Wall Infilled RC Frames OVERALL STRUCTURE: Response Evaluation Method of Buildings due to Waterborne Debris Impact Load INTERNATIONAL COOPERATION: Project for Technical Development to Upgrade Structural Integrity of

Buildings in Densely Populated Urban Areas and its Strategic Implementation towards Resilient Cities

Esti

mat

ion

Acc

ura

cy o

f d

isp

.

Impact Duration／Natural Period of Bldg.

Test Setup & Input Acceleration Wave

Damage to Masonry Wall with/without Reinforcement

Lateral actuator

Axial actuator

Specimen

Test Setup & Specimen after Axial Failure

RC320-0.2%-0.2 RC320-0.2%-0.3 RC320-0.4%-0.3Specimen

0.75

1.00

1.25

1.50

Re

sid

ua

l a

xia

l ca

pa

city

0.50

0.25

0

past researches

this research

mea

su

ree

valu

ation

Ratio of Evaluated-to-Measured Residual Axial Capacity

1 2 3 4 5 6-20-10

01020

Acc

. (m

/s2 )

Time (s)

Input acceleration wave（100%）

τ

F

Kamaishi (2011)

Stranded Ship after 2011 Tsunami

Time (s)

Force (kN)

Impact Load due to Ships Building Model

Impact Load

N

jj

j

j

K

Fi

K

F

1

Goodagreement

Science and Technology Research Partnership for Sustainable Development （SATREPS）

Project for Technical Development to Upgrade Structural Integrity of Buildings in Densely Populated Urban Areas and

its Strategic Implementation towards Resilient Cities

Technologies for enhancing structural resilience of buildings in Dhaka and their effective implementation schemes are proposed.

The proposed method have a better agreement with measured results than the other methods.

Unreinforcedmasonry wall

Reinforced masonry wall

Slight out-of-plane damage in reinforced masonry wall

Unreinforcedmasonry wall

Shaking table

Reinforcedmasonry wall

Estimation Eq. of disp.

The proposed Eq. successfully evaluated the building displacement.

Excitationdirection

Joint Research Group

Bangladeshi Representative

Japan

• IIS, The Univ. of Tokyo• Tohoku Univ.• Osaka Univ.etc.

• Housing and Building Research Institute

• Public Works Depart.• Univ. of Asia Pacificetc.

【Static Cyclic Loading Experiments of RC Frames with masonry wall @ Tohoku Univ.】

Weak Column Frame

Load vs. Drift Angle Strong Column FrameDue to the surrounding column capacities, the failure mode of the wall and seismic capacity of the overall frame were quite different.

＋

Sliding Failure

Compression Failure

-2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5-600

-400

-200

0

200

400

600 Weak column frame

Strong column frame

Load

(kN

)

Drift angle (%)

Final Damage