zhou peer 2011 high performance structural walls for tall...
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RESEARCH PLAN OF HIGH PERFORMANCE CONCRETE STRUCTURAL WALLS FOR
TALL BUILDINGS
PEER Annual Meeting 2011
Ying Zhou (周颖) Associate Professor
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China
October 1, 2011
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1. Background
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1.1 Current development of tall buildings worldwide
CTBUH, 2011/8/4
Council on Tall Buildings and Urban Habitant (CTUBH): • Top 15 tallest buildings: 9 (China) • Top 38 tallest buildings (2005~2010): 17 (China); 8 (Dubai)
The construction center of tall buildings has transferred from North America to Asian and Middle East.
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1.2 Tall buildings in China
Beijing Shanghai Zhejiang
Shanghai Shanghai Guangzhou
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1.3 Structural systems for tall buildings
Planar members - Frames - Shear walls - Bracings
Spacial members - Framed tubes - Core tubes
Structural systems - Frame structures - Shear wall structures - Frame-shear wall structures - Frame-core tube structures - Bracing-framed tube structures - Tube-in-tube structures - Bundled tube structures - Mega frame-core tube structures - ...
Structural walls are indispensable elements of tall and super-tall buildings to sustain the vertical gravity and horizontal earthquake effects and wind loads.
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2. Structural walls of tall buildings
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2.1 SRC shear walls (1)Test Specimen
CC
C
CC
C
CC
C
Angel steels embedded at boundary columns
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Test Setup
2.1 SRC shear walls (2)
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Observations
2.1 SRC shear walls (3)
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Observations
-400
-300
-200
-100
0
100
200
300
400
500
-12 -9 -6 -3 0 3 6 9 12
(MM)
(KN)
-500
-400
-300
-200
-100
0
100
200
300
400
500
-12 -9 -6 -3 0 3 6 9 12(MM)
(KN)
-500
-400
-300
-200
-100
0
100
200
300
400
500
-12 -9 -6 -3 0 3 6 9 12(MM)
(KN)
2.1 SRC shear walls (4)
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Formulations
tacu VVVV ++=
Arch mechanism contribution and primarily related to the geometry and axial load
The contribution from the truss mechanism primarily from the shear reinforcement
The concrete contribution primarily from the concrete aggregate interlock mechanism
2.1 SRC shear walls (5)
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Formulations For SRC walls,
aash
yvw
cSRCWu Afh
sAf
AANbhfV
λλ5.08.01.004.0
5.01
00 ++
+−
=
The dowel action and confinement effect of edge structural steels
For SRC tubes,
aash
yvw
crSTu Afh
sAf
AANbhfV
λβ
λ5.08.01.004.0
5.01
00 ++
+
−=
Confined factor of the flange walls to the web walls, use βr = 1.3 here
First Conference on Advances in Experimental Structural Engineering (2005)
2.1 SRC shear walls (6)
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Multi-embedded sections
Steel embedded in the middle and at boundaries
-1:3; -16 specimens; -0.8/1.5/ 2.0/3.75 aspect ratio; -shear type flexual type.
2.2 SRC shear walls (1)
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MSS did not affect the final failure mode of the CSW, but they would restrain the development of cracks and prevent the concrete from serious spalling.
Only boundaries Both boundaries and middle sections
3.75 1.50 1.50 0.80
2.2 SRC shear walls (2)
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The effect of the embedded steel sections is not significant at the elastic stage. When structure entered nonlinear stage, however, the steel members encased in the reinforced concrete shear walls contributed to the good performance of structures.
Difference in inter-story drift
Difference in time-history displacement Minor Moderate Major
With steel embedded
Analytical model
Without steel embedded
SDTSB (2010)
2.2 SRC shear walls (3)
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2.3 Problems
2008 Wenchuan Earthquake 2010 Chile Earthquake
Experiment
There still are damages to shear walls.
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3. Earthquake resilience of tall buildings
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Structures without damages or
with only minor damages
happened after earthquakes
a r e c a l l e d “ E a r t h q u a k e
resilient structures”, which
recently has been a worldwide
hot issue in earthquake
engineering.
3.1 Earthquake resilient structures
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3.2 Earthquake resilience of tall bldgs
(NSFC project,
2011-2013)
Elastic
High performance
concrete shear walls
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4. HP concrete structural walls of tall buildings
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4.1 Research planMaterial Member System
Mechanical properties: - Hybrid effect - Compressive strength - Tensile strength - Flexural strength - Impact toughness
Ductility properties: - Fatigue - Impermeability - Cracking resistance - Frost resistance - Corrosion resistance
Analysis Test Analysis Test
Earthquake resilience of tall buildings
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Conclusions In the next couple of years there will be
increasing design and construction of tall buildings in China.
To improve the seismic performance of shear walls for tall buildings, steel reinforced concrete (SRC) walls have been experimentally and analytically studied.
High performance concrete shear wall will be explored for the earthquake resilience of tall buildings.
Collaboration with professors in material is strongly needed for this research.
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Thanks for your attention!
• AnyQuestion?• AnySuggestion?