Development of Hazard Damaged Buildings Model by Chi-Chi Earthquake Data
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Development of Hazard Damaged Buildings Model by Chi-Chi Earthquake Data. B. J. Lee College of Construction and Development Feng Chia University Nov. 17, 2003. Contents. Introduction Overview of Building Damage Estimation of Strong Motion Fragility Curves for the Building Damage

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Development of Hazard Damaged Buildings Model by Chi-Chi Earthquake Data

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Development of Hazard Damaged Buildings Model by Chi-Chi Earthquake Data

B. J. Lee

College of Construction and Development

Feng Chia University

Nov. 17, 2003


Contents

  • Introduction

  • Overview of Building Damage

  • Estimation of Strong Motion

  • Fragility Curves for the Building Damage

  • BuildingSeismic Risk Analysis

  • Conclusions


Introduction

Chichi Earthquake & Chelungpu Fault

The Chelungpu fault cross Guangfu elementary school, Wufeng , Taichung County


Introduction

Building Damage Survey Report

8,773 buildings were surveyed in preliminary report


Introduction

incomplete

Building Damage Ratio

=

(Buildings)

=

(Buildings)

No suitable database

  • Although the survey report is very useful, the inventory of buildings was not possible to associated with data.

  • To construct the fragility curve to be used for damage assessments, however, building damage data associated by inventory are necessary.


Introduction

Building Damage Database

List of earthquake building

subsidy

Partially & Totally

Collapsed Building

Database of Building Tax

(inventory of buildings)

Address

Type of Structure

Floor Area

Name

Construction Period

……

Chichi Earthquake

Building Damage

Data Warehouse


Overview of Building Damage in the Chichi Earthquake

Use Base Area to Measure Building Damage

One Building

Base area


Overview of Building Damage in the Chichi Earthquake

Structural Type Distribution of Totally Collapsed Buildings


Overview of Building Damage in the Chichi Earthquake

Collapsed Ratio for Each Structural Type


Overview of Building Damage in the Chichi Earthquake

Collapsed Ratio of Reinforced Concrete Buildings in Different Construction Periods


Estimation of Strong Ground Motion

Distribution of Accelerometer Sites

  • Recover region :

    (Miaoli、Taichung、

    Nantou、Jiayi、Yunlin and

    Changhua)

  • Number of accelerometer

    sites : 103

  • Min=21.05 gal

    Max=989.22 gal

    Avg.=214.62 gal

    St.Dev.=177.492 gal


Estimation of Strong Ground Motion

Attenuation Model - Campbell Form

Coefficients of different strong motion factors


Estimation of Strong Ground Motion

=correction factor

= number of observation (103sites)

= data of Chichi earthquake

= data of Campell form

Correction Factor for Campbell Form (Tsai, 2001)


Estimation of Strong Ground Motion

Campbell Form Including Correction Factor

Chichi earthquake records (103 stations)


Estimation of Strong Ground Motion

Geostatistic Theory

Equation of horizontal attenuation relationship

Trend

Kriging

Residual


Estimation of Strong Ground Motion

Ordinary Kriging System (Semi-variogram)

  • Spherical Model

Data interval : 2500 M

h

Distance (M)


Estimation of Strong Ground Motion

Estimated PGA Distribution in Recover Region

PGA(gal)

Taichung County

Taichung City

Nantou County

Che-long-pu fault


Fragility Curve for Building Damage

Fragility Curves

  • A lot of seismologists hypothesize lognormal distribution between strong motion and building damage (Shinozuka, 1999; Yamaguchi & Yamazaki, 1999; Osamu Murao, 1999)

  • After Determining the mean and standard deviation, we can construct the fragility curve


Fragility Curve for Building Damage

Study region – 15 Km buffer of Chelungpu fault line


Fragility Curve for Building Damage

Fragility curves of the different structural types – totally collapsed


Fragility Curve for Building Damage

Fragility curves of RC building for three different construction periods


Near-Fault Area

Hanging Wall

Foot Wall

Puli Basin

BuildingSeismic Risk Analysis

Topographical Classification of Nantou County


BuildingSeismic Risk Analysis

CDF of estimated PGA for different topographic conditions


Topographic Condition

-

-

Hanging wall

Foot wall

Near-fault line

Basin

-

-

5.99

5.88

6.11

6.07

-

-

0.20

0.22

0.21

0.05

RC

Before 1982

6.76

0.48

7.29%

4.85%

11.05%

7.84%

1983~1989

6.87

0.45

3.83%

2.37%

6.38%

3.87%

After 1990

7.06

0.55

3.53%

2.33%

5.45%

3.72%

Reinforced Masonry

6.72

0.44

6.79%

4.36%

10.73%

7.17%

Mud-Brick

6.19

0.33

30.50%

21.23%

41.88%

35.72%

Masonry

6.48

0.40

13.78%

9.13%

20.59%

15.19%

BuildingSeismic Risk Analysis

BuildingSeismic Risk Analysis


BuildingSeismic Risk Analysis

Risk probability

  • The damage ratio of building= the degree of building resist the strong motion index (R) < PGA(S)

Risk probability of building damage refers to the probability when resistance of the building against strong motion index ( ) is smaller than significance of strong motion ( )


The stands for the cumulative probability distribution and is also called reliability index.

BuildingSeismic Risk Analysis

Risk probability


Topographic Condition

-

-

Hanging wall

Foot wall

Near-fault line

Basin

-

-

5.99

5.88

6.11

6.07

-

-

0.20

0.22

0.21

0.05

RC

Before 1982

6.76

0.48

7.29%

4.85%

11.05%

7.84%

1983~1989

6.87

0.45

3.83%

2.37%

6.38%

3.87%

After 1990

7.06

0.55

3.53%

2.33%

5.45%

3.72%

Reinforced Masonry

6.72

0.44

6.79%

4.36%

10.73%

7.17%

Mud-Brick

6.19

0.33

30.50%

21.23%

41.88%

35.72%

Masonry

6.48

0.40

13.78%

9.13%

20.59%

15.19%

BuildingSeismic Risk Analysis

Risk probability


å

m

w

N

=

Pi

k

kl

k=1

k = building category

l = indicates the subsurface soil condition

Nk = ratio of buildings with category k

w kl = risk probability of building category k on soil condition l

BuildingSeismic Risk Analysis

BuildingSeismic Risk Analysis

  • Murao et al. (1999)


BuildingSeismic Risk Analysis

Actual Damage vs. Risk Analysis

Risk level

Actual damage level


BuildingSeismic Risk Analysis

Error of Risk Analysis

>


Conclusions

Haz-Taiwan


Thank You for Your Attention


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