Reference 2

Seismic Retrofitting Promotion Planand its Implementation of TMG

CONTENTS
IEarthquake Damage

II Damage Estimation and Current
Situation of Tokyo
III Plan of TMG
IV Effort of TMG

H. Kobayashi, Urban Development Bureau, TMG

1

2

I Earthquake Damage
Damages of Great Hanshin-Awaji earthquake（17 January 1995）

Now

90% of death arecrushing death due
to collapse ofbuildings
24% of severely or
collapsed RC
buildings were thatbuilt with oldstandards

Magnitude

Buildings
collapsed

Buildings
partially
damagedDeath andmissing

7.3

104,906

144,274

6,4373

Seismic retrofitting plan41

Reference 2

II Damage Estimation of Tokyo

A scene in urban areaz

The occurrence of a big earthquake in MinamiKanto area is about 70% probability in the coming
30 years （Central Earthquake ResearchCommittee, 2004)z

One fourth of the buildings may collapse when theearthquake occur■ Earthquake Resistance Standards
1950 Building Standards law
1981 Revision of Building Standards law（newEarthquake Resistance Standards）
1995 Great Hanshin-Awaji earthquake
Seismic Retrofitting Promotion Act5Niigataken2004）
Niigataken-Chuetsu Earthquake （23 Oct. 2004）

MagnitudeBuildings
collapsed

Buildings
partially
damagedDeath andmissing

6.8

3,175

13,792

65
7

Seismic retrofitting plan

6

Around Daikoku Park

82Reference 2【Damage Estimation】

Spread of Fire

Magnitude

Buildings
collapsed

Buildings
partially
damagedDeath andmissing

1 Sept. 1923
Kanto Earthquake

7.9

128,266

126,233

142,807

17 Jan. 1995
Great Hanshin-Awaji Earthq.

7.3

104,906

144,274

6,437

23 Oct. 2004
Niigataken-Chuetsu Earthq.

6.8

3,175

13,79265

7.3

127,000

347,000

5,600

7.3

52,000303,000

3,400

Damage estimation (DisasterPrevention Committee, TMG)North Tokyo Bay Earthq.
Damage estimation (DisasterPrevention Committee, TMG）

Tama Earthquake

9

III Plan of Tokyo

10Seismic Retrofitting Promotion Plan of TMG

Revision of Seismic Retrofitting Promotion Act （Jan. 2006）（Formulated in March, 2007）〔After revision 〕 ○ Obligation of endeavor of public○ Basic policy by national government○ Seismic retrofit promotion plan by local government

Houses

Offices, rental apartments, etc.
Guidance / Advice〔addition〕

Purpose and Situation

Approval of theseismic retrofit plan
〔Expansion of thescope of approval〕

Hospitals, Department stores,Hotels, etc.

Houseswhich may
block roads〔Addition〕
Schools, Nursing homes, etc.

Guidance /Advice

Instruction, Informationcollection and dissemination,
on-site inspection

Promoting seismic retrofitting of houses andbuildings to halve the estimated damagesz

Providing guidelines for municipalities fordevelopment of seismic retrofit promotion plans

Target buildings
Seismic retrofitting
does not require theimprovement of theother inadequateness11

Seismic retrofitting planzz

Houses and Buildings built before new earthquake
resistance standards enforced (1 June 1981)123Reference 2

Number of Houses Required to Achieve theObjectives of Earthquake Retrofitting

Seismic Retrofitting Promotion Plan
■ Time span - 10 years from FY2006 to FY2015

Million houses
７■ Objectives

End of FY2005

End of FY2015

Houses (detached house, apartment)

76.3%

90%

Buildings for special use

76.7%

90%

Buildings available to general public,
such as department store, hotel,theater, etc.

77.6%

100%

Primary and middle schools

72.8%

100%

Public buildings critical to disaster reduction

78.0%

100%

Insufficientquake-proof
1.32 Mil４３２(Fire stations, police stations, etc.)

Buildings along emergency road

５Houses

Types of Buildings

Insufficientquake-proof
６Ratio of quakeproof buildings

Quake-proof
4.25 Mil（76.3%）

Insufficientquake-proof
0.95 Mil

0.61 Mil
0.34 Mil（5.6%）

Number ofhouses
required to be
retrofitted toaccomplish
the objective
Quake-proof
5.17 Mil（84.4%）

Quake-proof
5.17Mil（84.4%）

Objective
90%

１100%
13

IV Endeavor of TMG

0FY2005

FY2015（natural rehabilitation）

FY2015（Objective）

14

1 Financial Aid to the Building Owners■ Promotion of earthquake retrofitting of

1 Financial aid for the houses in dense area ofwooden house

private buildings
1 Financial aid to the building owners

2 Financial aid for apartment buildings

2 Consolidate the environment for easy seismicretrofitting

3 Financial aid for the houses along theemergency road3 Raising public awareness and motivation

15

Seismic retrofitting plan164

Reference 2■

Flow of Earthquake Retrofitting
Seismic diagnosis

Seismic retrofitting
designSeismic retrofitting
construction

Financial Aid for Wooden Houses
in Redevelopment area

What is seismic diagnosis
Seismic diagnosis means tomake a judgment on whether or
not a house needs retrofitting andconfirm its earthquake
performance after the retrofittingby registered architects throughinvestigation on the strength ofwall, balance, joint condition anddeterioration of structure basedon the design drawings and/or site
inspection

17

Seismic Diagnosis
One sixth of the cost with upper limit of 25,000 Yen【In the case of partial aid】
Owner（Proportion) 1/3（Amount)
50

Country TMG Ward

1/3
50

1/625

1/6
25 thousand Yen

Seismic Retrofitting
・ Width of the road less than 6 meters
It is estimated it will cost 1.5 Mil Yen for a house to retrofit
Owner（Proportion)（Amount)

1/2
750Country TMG Ward

4.5/20 5.5/40
330 210 210 thousand Yen

18■ Financial Aid for the Elderly Persons to Prevent

Financial Aid for Apartment

Their Life in Case of the Collapse of Building

Seismic Diagnosis

Quakeproof shelter

Quakeproof bed

250,000 Yen(2 days to set up）

210,000 Yen

1/6 of the cost within 1/4 of the aid by ward
Owner

（Proportion)

1/3

Country TMG Ward

1/3

1/6 1/6

Seismic Retrofitting
1/4〜1/6 of the 23% of the total cost and within 1/4 ofthe aid of ward, JPY125,000/house

19

Seismic retrofitting plan

205

Reference 2

Financial Aid for the Houses along theEmergency Road

Financial Aid for the Houses along theEmergency Road

TMG emergency transportation road network
Dot marked part is the target

Targeted Buildings
Height45°
Distance to Road Center
Legend
1st priority
2nd priority
3rd priority
Highways

21

2 Consolidate the Environment for Easy
Seismic Retrofitting

Tax Exemption for Seismic Retrofitting
Houses○ Introduction of low-cost and reliable

Exemption of income tax (10% of the cost, upper
limit 200,000 yen)z Exemption of city planning tax and fixed property tax
zBuilt in 1965 Iｗ0.53→1.0
1.7 mil Yen 2 days

Special pay off for the income and corporate taxes
for 10% of the construction cost

23

Seismic retrofitting plan

Seismic resistant frame madeby aluminum alloy

seismic retrofitting method forwooden houses
・Introduction of equipment

Reinforcement by seismic
resistant panel

Commercial buildingsz

22・Strengthening wall by special panel
and architectural hardware
・Fixing-up from inside the room without
damaging the ceiling and floor
Built in 1960 Iw0.68→1.06
540,000 Yen around 5 days

246Reference 2○3 Raising Public Awareness and Motivation

Examples of Seismic Retrofitting● Establishment ofcommunity seismic
retrofitting promotion
committee● Information dissemination activities through earthquake safety campaign

Retrofitting technique（seismic isolator）

Retrofitting example（outside brace）
25○ Consultation system
・ Registration andannouncement of the“Seismic Diagnosis Officeof Wooden House ” for theregistered architect's office
who has the reliableengineers（234 offices at present）

Consultation services on seismic
resistance of wooden house

Seismic safety forum「Seismic Diagnosis and Retrofitting Mark Display System」Seismic retrofitting DVD【sample of the plate】■① General information② For wooden houses③ For apartment buildings

Outline of the system○ Displaying the mark for thebuildings which has finished seismicretrofitting○ using the nationally uniform mark○ Displaying at the entrance so thatthe earthquake performance can beeasily confirmed
この建築物は、耐震診断又は耐震改修の結果、現行の耐震改修促進法に基づく○ Publishing on the homepage of TMG

耐震診断の指針又は建築基準法に基づく耐震基準に適合している建築物です。

■

建築物の名称
建築物の所在地
交付年月日
交付番号

東京都
27

Seismic retrofitting plan26

26
Advertisement in the train

Target buildings
The buildings which has finishedthe seismic retrofitting in accordancewith the approved retrofitting plan
based on the seismic retrofitting
promotion act and confirmed by TMG
28

7

Reference 2

Integrated Consultation Service for Seismic Safety(From 11th May)
Consultation service for various inquires on seismic safety
Inside TMG Disaster Prevention and urban Development center
Address Bitake Bldg. 1-15-9 Shibuya
Tel 03-5778-2790（director call）

Thank Youfor Your
Attention（Access）
5 min. from Shibuya station of JR、Tokyo Metro, and private railways

Seismic retrofitting plan29308