Structural Engineering Solutions to Architectural...
Transcript of Structural Engineering Solutions to Architectural...
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Structural Engineering Solutions to Architectural Challenges
Dr. Karoon Chandrangsu
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• Primary Requirements for structural design
– Stability
– Strength and stiffness
– Economy
• Structural Planning and Design
– Architectural design “Art of making forms”
– Structural planning “Feeling for Structures”
– Structural Design “ Art of proportioning”
• Idealization of Structures
Real Structure Idealized Structure
(Mathematical and physical model of structures)
Nowadays, more and more advanced structural systems have emerged to accommodate the current challenging architectural design trends.
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• Computer Aided Design and Construction
In the past – Hand calculation
Present – 3D computer analysis
Future – 3D computer analysis with BIM
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
Well defined problem statement when dealing with free form architecture
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New SET headquarters
- Composite columns were used (concrete filled steel tube)- Steel transfer beams (4.5 m deep)
Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
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- Composite columns were used (concrete filled steel tube)
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- Steel transfer beams
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G Land Tower
- North tower has over 31m cantilever span on the top- South tower is 8 degree inclined from verticality
Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
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North TowerRC Frame and shear core interaction
Steel structure
South TowerCentral framework - RC Frame and shear core interaction
Side framework- Inclined RC frame (columns and beams)
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Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
-The total height is 315m and the width of the building is 20m.
Aspect ratio = 15 Very slender
Magnolia Waterfront Residence
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Wind Tunnel Test for Structural Loadings using High Frequency Force Balance (HFFB) method
– Lightweight model
– Measure forces at the base
– Model terrains around buildings and nearby buildings
– Wind is applied from all directions (magnitude in each direction depends on wind climate study)
-60
-40
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Wind Direction [deg]
Fy
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• Acceptance Criteria
– Structural members must be able to resist wind forces under ultimate limit state without failing
– Under service limit states, deflection must be less than Z/400 (Z = Elevations) to avoid damages to nonstructural components (partition walls, façade) and to reduce perceptions of occupants
– Acceleration must be within acceptable limits to avoid discomfort to occupants
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Special structural systems are required in order to sustain wind loads
1) Wall shaped columns and large central lift core
Special Structural Systems for Lateral Loads
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2) Outrigger floors on L26M and L42M
Special Structural Systems for Lateral Loads
– Outrigger trusses link the columns in the front and in the back so they effectively deform together
• Effects of Outriggers Trusses
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Elevation (m)
– lateral sway can be significantly reduced by adding outrigger floors
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Dhammakaya Temple
Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
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Bangkok Art and Cultural CenterPhayathai Road, Bangkok
• Long span structure• Curved structure
Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
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The new Thai House of Parliament Samsean road, Bangkok
• Considered as one of the most important buildings in Thailand
• Deep excavation near the river
• Blast resistance design for podium columns
• Long span structures and special building crown which expresses classical Thai architecture
Case Study
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Structural Modification for meeting room at Klai Kang VaunPalace, Hua-Hin
Case Study
• Eliminate columns in the middle to accommodate column free space
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Thank you
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