seismic design of multistorey concrete structures · 2006-06-13 · seismic design of multistorey...
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Seismic Design of Multistorey Concrete Structures
Course Instructor:
Dr. Carlos E. Ventura, P.Eng.Department of Civil EngineeringThe University of British [email protected]
Short Course for CSCE Calgary 2006 Annual Conference
Lecture 1Observed Seismic Response of Concrete
Buildings during Earthquakes
Instructor: Dr. C.E. Ventura
No. 2Seismic Design of Multistorey Concrete Structures
CONCRETE CONSTRUCTION
• Structural walls or frames• Cast-in-place, or precast prestressed• Combinations of the above
ATC-20-1:51
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No. 3Seismic Design of Multistorey Concrete Structures
Seismic Hazard
soil
Source 1
Source 2
Shaking at site depends on:• proximity of sources• return period• path• site conditions
Instructor: Dr. C.E. Ventura
No. 4Seismic Design of Multistorey Concrete Structures
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No. 5Seismic Design of Multistorey Concrete Structures
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No. 6Seismic Design of Multistorey Concrete Structures
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No. 7Seismic Design of Multistorey Concrete Structures
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No. 8Seismic Design of Multistorey Concrete Structures
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No. 9Seismic Design of Multistorey Concrete Structures
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No. 10Seismic Design of Multistorey Concrete Structures
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No. 11Seismic Design of Multistorey Concrete Structures
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No. 12Seismic Design of Multistorey Concrete Structures
KOBE, JAPAN; JANUARY 1995
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No. 13Seismic Design of Multistorey Concrete Structures
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No. 14Seismic Design of Multistorey Concrete Structures
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No. 15Seismic Design of Multistorey Concrete Structures
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No. 16Seismic Design of Multistorey Concrete Structures
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No. 17Seismic Design of Multistorey Concrete Structures
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No. 18Seismic Design of Multistorey Concrete Structures
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No. 19Seismic Design of Multistorey Concrete Structures
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No. 20Seismic Design of Multistorey Concrete Structures
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No. 21Seismic Design of Multistorey Concrete Structures
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No. 22Seismic Design of Multistorey Concrete Structures
ATC-20-1:21
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No. 23Seismic Design of Multistorey Concrete Structures ATC-20-1:21
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No. 24Seismic Design of Multistorey Concrete Structures ATC-20-1:21
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No. 25Seismic Design of Multistorey Concrete Structures
Recorded Motions in Buildings
Instructor: Dr. C.E. Ventura
No. 26Seismic Design of Multistorey Concrete Structures
1994 Northridge Earthquake
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No. 27Seismic Design of Multistorey Concrete Structures
Van Nuys, California – Holiday Inn building
Instructor: Dr. C.E. Ventura
No. 28Seismic Design of Multistorey Concrete Structures
Typical Floor Plan and Member Sections
Y12685
Y2
Y3
Y4
X1 X11 X2 X3 X4 X5 X6 X7 X8 X9
5715 5715 5715 5715 5715 5715 5715 5715
6120
61
20
6350
16×23
14× 2
2 14
× 22
16×23 16×37
16×23
14× 2
3
12× 2
2
14× 2
3
16×22 16×22 16×22 16×22
16×22 16×2216×2216×22 16×22 16×22 16×22 16×2214
× 22
14× 2
2 14
× 22
SM SM Ch.7,2 Ch.1,5
Ch.9~12 Ch.3,4,6,8
1F: Ch.13~16
C1 C8
C9 C7C6C5C3
C2 C1A C4
16×22 16×22
C10A C12
C19
C28
C13 C14 C15
C23C22C21 C20
C29 C30 C31C32 C33
C24 C25 C26
C34
C16
C27
C36 C35
C17 C18
355mm Spandrel beam 16"x22"
2#9
2#9
C4~C7, C30~C34Long. bar: 10#9 Hoop: #3@300mm 50
8mm
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No. 29Seismic Design of Multistorey Concrete Structures
Typical column reinforcement details
Instructor: Dr. C.E. Ventura
No. 30Seismic Design of Multistorey Concrete Structures
Recorded Earthquakes and Vibration Tests
Max. Base Max. Roof Drift Period Freq.
Accel. (g) Accel. (g) R-B (cm) (Sec.) (Hz)
Pre-1971 ambient measurement - - - 0.52 1.92
1971 San Fernando (M=6.5, d=20 km) 0.14 0.32 7.8 1.3 0.77
Post-1971 ambient measurement - - - 0.7 1.43
1987 Whittier (M=6.1, d=41 km) 0.14 0.17 2.8 1.1 0.91
1992 Landers (M=7.5, d=187 km) 0.04 0.13 3.2 1.2 0.83
1992 Big Bear (M=6.6, d=152 km) 0.02 0.06 1.6 1.2 0.83
1994 Northridge (M=6.7, d=7 km) 0.45 0.58 23.0 1.5 - 2.0 0.67 - 0.5
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No. 31Seismic Design of Multistorey Concrete Structures
Comparison of Roof Particle Motion
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No. 32Seismic Design of Multistorey Concrete Structures
Column damage
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No. 33Seismic Design of Multistorey Concrete Structures
Damage Details
Courtesy of Dr. Naeim
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No. 34Seismic Design of Multistorey Concrete Structures
Interior Damage
Courtesy of Dr. Naeim
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No. 35Seismic Design of Multistorey Concrete Structures
North side damage
Courtesy of Dr. Naeim
Instructor: Dr. C.E. Ventura
No. 36Seismic Design of Multistorey Concrete Structures
Temporary shoring
Courtesy of Dr. Naeim
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No. 37Seismic Design of Multistorey Concrete Structures
Repaired & Retrofitted Building (1996)
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No. 38Seismic Design of Multistorey Concrete Structures
Ground Failure
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No. 39Seismic Design of Multistorey Concrete Structures
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No. 40Seismic Design of Multistorey Concrete Structures
EXAMPLE – SEVERE GROUND DISPLACEMENT OR FOUNDATION DAMAGE
ATC-20-1:21
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No. 41Seismic Design of Multistorey Concrete Structures
Liquefaction
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No. 42Seismic Design of Multistorey Concrete Structures
Points to remember
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No. 43Seismic Design of Multistorey Concrete Structures ATC-20-1:21
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No. 44Seismic Design of Multistorey Concrete Structures
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No. 45Seismic Design of Multistorey Concrete Structures
ATC-20-1:21
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No. 46Seismic Design of Multistorey Concrete Structures
Remarks
• Instrumentation of buildings is valuable for understanding their response to severe shaking
• Observed response of RC buildings provides valuable information and lessons
• Ground motions with the same PGA, but different mechanisms can have very different demands upon a structure