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- Severe damage of RC buildings with structural walls were
- bserved.
- Three retrofitted RC buildings are picked up and the
damage are investigated.
- The reason of the damage and what happened during the
INVESTIGATION ON THE PERFORMANCE OF BUILDINGS WITH STRUCTURAL WALLS - - PowerPoint PPT Presentation
INVESTIGATION ON THE PERFORMANCE OF BUILDINGS WITH STRUCTURAL WALLS - - PowerPoint PPT Presentation
INVESTIGATION ON THE PERFORMANCE OF BUILDINGS WITH STRUCTURAL WALLS IN THE TOHOKU, JAPAN, EARTHQUAKE OF 2011 Toshikatsu Ichinose, Nagoya Institute of Technology Santiago Pujol, Purdue University Susumu Takahashi, Nagoya Institute of Technology
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- Built in 1968
- 6-story RC building
- Retrofitted in 1997
6600 18800 5600 6600 3200 8000 8000 8000 8000 8000 8000 8000 56000
1st story plan
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Observed damage in longitudinal direction
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Observed damage in longitudinal direction
15.0 5.0 5.0 1.0 6.0 10.0 1.5 1.5 10.0 5.0 1.0
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Limit analysis
A B C D
Σatσy
This frame has large strength. …But, coupling beams deform 5 times as much as walls.
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A B B’ C D
15 1975 800
(mm)
1/910 1/620 1/790 1/540 1/1360 1/1410
Estimated deformation
15.0 5.0 5.0 1.0 6.0
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6th story plan
8000 56000 3000 6600 6000 6600 19200 3000 8000 8000 8000 8000 8000 8000
7 8 9 10 11 12 13 14 H I J K
- Built in 1966
- 8-story RC building
- Retrofitted in 1996
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Observed damage in longitudinal direction
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Observed damage in transverse direction
2F 3F 4F 5F 6F 7F 8F RF
600 280 430 D25 (#8)
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Observed damage in transverse direction
2F 3F 4F 5F 6F 7F 8F RF
- utside
window inside
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Observed damage in transverse direction Damage in left hand side was serious.
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Reinforcement with carbon fiber
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Pushover analysis
Large deformation In short beam
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Effect of Longitudinal Web Reinforcement Discontinuities on the Drift Capacity of Structural Walls
Ying Wang Santiago Pujol Purdue University
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Plan View (stories: 1-2)
8m 6.75m
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8m 6.75m
Plan View (stories: 3-9)
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3.3m
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Earthquakes and Strengthening
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Miyagi Earthquake 1978
Shiga et al. (1981)
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Strengthening in 2001
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Tohoku Earthquake 2011
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Discontinuity (bottom of third story)
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Tohoku Earthquake 2011
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
Displacement Response (m) Period (sec)
1978NS-2%Damping 2011NS-2%Damping
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Hypothesis
Discontinuity
( longitudinal web reinforcement )
Strain Concentration
Decrease in drift capacity
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Experimental Program
2' 10" 3'-9" 10"
Specimens 2,5 and 6 Specimens 1,3 and 4
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Experimental Program
10"
lbe = 2" tbe = 4"
2" 1" 1"
tw = 2" lbe = 2" lw = 6"
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5 10 15 20 25 30 0.000 0.020 0.040 0.060 0.080 Height (in) Maximum Tensile Unit Strain
Tensile Strain Distribution at a Drift Ratio of 3%
No Cutoffs Cutoffs
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No Cutoffs Cutoffs
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