ASBD Overview
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1 ASBD Overview Axial System of Bending-type Damper Invention by K. J. Chuang U. S. (2004) & Japan (200x) Patent Tested at National Earthquake Engineering Research Center (200x)
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ASBD logo. ASBD Overview. change this horizontal line to seismic waveform, use light grey color. Axial System of Bending-type Damper Invention by K. J. Chuang U. S. (2004) & Japan ( 200x ) Patent Tested at National Earthquake Engineering Research Center ( 200x ). Insert year of patent. - PowerPoint PPT Presentation
Transcript of ASBD Overview
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ASBD Overview
Axial System of Bending-type Damper
Invention by K. J. Chuang
U. S. (2004) & Japan (200x) Patent
Tested at National Earthquake Engineering Research Center (200x)
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Superior seismic isolation & protection
Affordable cost
Straightforward design analysis
Easy installation and maintenance
Can retrofit existing structure
ASBD Advantages
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Independent componentsVertical bearings support structural weightHorizontal dampers dissipate seismic
energy
ASBD Fundamentals
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Orthogonal seismic energy paths vastly simplify design and analysis work
ASBD Fundamentals
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Steel plate provides high load-bearing capacity
Vertical Bearing
Teflon coating facilitates low friction & high wear
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Friction coefficient data
Vertical Bearing
Wear characteristics data
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Horizontal Damper
Long axial displacementHigh energy dissipationConsistent damping
coefficientExcellent durability
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Force-displacement consistency
Large displacement durability test 75 ton, 100 cycles
Damping coefficient
Horizontal Damper
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Affordable components cost due to simplicity of concept and design
Lower original structure cost due to reduced reinforcement requirements against earthquakes
Cost
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Simple to install due to separate vertical and horizontal components
Can easily retrofit existing structures
Installation
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Endurance test, three-story RC structure at NCREE
Laboratory Test
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Test data, actual seismic input - El Centro (1940)
Laboratory Test
•Ground acceleration •Top floor acceleration
只要一個圖就夠了，這其中以 El Centro 對研究地震的人來說最著名．如果日本客戶，用 Kobe 也行，要依學術研究習慣註明年份 (1995) ．
地表加速度，原圖中的藍線 頂樓加速度，原圖中的紅線
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Fatigue test at NCREE withstood cumulated energy dissipation equivalent to 15 repetition of Ji-ji earthquake (1999, Richter scale magnitude 7.3)
Laboratory Test
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Technology Comparison
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Technology Comparison
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Technology Comparison
Conventional Structure ASBD
Earthquake Survivability Richter 6.5 Richter 7 to 8
Acceleration at Rooftop (under 7.3 earthquake)
Amplified 3 times
1.4 g
Reduced 80%
< 0.1 g
Rebar Usage 150 kg/m2 110 kg/m2
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Competition Comparison
LRB (Lead Rubber Bearing)
ASBD
Design Principles
Complex Simple
Capacity 0.2 m 0.8 m
Endurance 4 cycles > 100 cycles
Installation Complex Simple
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Design Principles
Competition Comparison
LRB ASBDCoupled vertical and horizontal components, prone to generating bending moment, increasing design complexity.
Separate vertical and horizontal components, simplifying design work, easy to handle.
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Large Displacement Handling Capacity
Competition Comparison
LRB ASBDEffective damping ratio tops off at 25% when displacement reaching 0.2 m.
Displacement 0.3-0.8 m can be designed upon request. Test data shows 0.4 m example.
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Damper Endurance
Competition Comparison
LRB ASBDClosed space inhibits heat dissipation. Damper stability deteriorates after 4 cycles.
Open design aids heat dissipation. Damper behavior unchanged after 100 cycles.
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Components Installation
Competition Comparison
LRB ASBD•Tedious preparation work
•Takes 4-5 weeks
•Difficult to replace
•Straightforward installation
•Less than 1 week
•Easy to replace
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Award Winning
Gold Medal 2009Chinese Society of Structural Engineering
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Breakthrough concept and design principle
Components exhibits excellent capacity, endurance, and consistency
Can withstand earthquake magnitude 7 to 8
Simple installation
Affordable cost
Conclusion
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Conclusion
We stop no earthquakes We stop the damages
Core value ASBD !
