Structural Engineering Solutions to Architectural...
Transcript of Structural Engineering Solutions to Architectural...
Structural Engineering Solutions to Architectural Challenges
Dr. Karoon Chandrangsu
• 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.
• 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
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
- Composite columns were used (concrete filled steel tube)
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- Steel transfer beams
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
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)
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
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
-20
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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
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
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)
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Elevation (m)
– lateral sway can be significantly reduced by adding outrigger floors
Dhammakaya Temple
Case Study
Problem Statement
• Computer Aided Design and Construction
• Structural Mode of failure
• Fail-safe Concept
• Design – Construction Coordination
• Strength and Stability
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
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
Thank you
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