Integrated Civil Engineering Design Project (Building Structure Design Example) CIVL 395

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Integrated Civil Engineering Design
Project(Building Structure Design Example)
CIVL 395

• HKUST

By Ir. K.S. Kwan Date 4/07
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Architectural Consideration

• Limitation (plot ratio, height, public
  facilities, slope)
• View/light/Wind climate
• Flat size, Number of Blocks
• Podium (Other Facilities Cube house/ Carpark/
  Commercial complex)
• Budget estimation
• Other considerations

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Structural Engineer Consideration

• Any site construction difficulties
• Site Access
• Construction platform
• Foundation option
• Time for completion
• Tower Design
• To provide a cost-effective solution

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Case A 45 storey
Lack of flexibility by structural element
End wall should be effectively used as shear wall
to provide better stiffness
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• To enhance the stiffness of building by linking
  the walls as much as possible

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Lack of flexibility by structural element
Too much wall
No support for slab
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Wall not allowed in front of stairs
Beam ahead bedroom
Too much wall
End wall should be effectively used as shear wall
to provide better stiffness
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Structural Framing Plan
Secondary Beam for gravity load only
Aspect ratio 45x3/19 7.0
Lintel Beam For both wind load and gravity load
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Case B 15 storey
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Aspect ratio 15x3/60 0.75
Column structure used
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Case C 57 storey
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Aspect ratio 57x3/24.3 7.03
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Podium Structure

• To confirm the column layout under transfer
  structure
• To confirm the transfer plate/column layout
• To confirm the size of transfer structure (e.g.
  thickness of transfer plate)
• Evaluate the tower loading and estimate the size
  of transfer structure size

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Tower Framing plan
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Transfer Structure under tower
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Supporting columns under transfer structure
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Other beam/column structure below
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Other beam/column structure below
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Other beam/column structure below
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Preliminary Computer Model

• Use the effective members for first model
• Estimate the member size for model input based on
  gravity load first and provide some reserve for
  wind load (say 20 40 of wind load)
• Check top deflection lt H/500

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• Only analysis the critical wind direction
• Only use the effective members for modeling

Minor wall not selected for preliminary modeling
Width of building to calculate the wind load
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• For preliminary model, only typical floor is used
  to simulate the whole tower.
• Building height should be maintained

Tower model
Podium model
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Element Checking

• Check critical lintel beam force (e.g. check wind
  shear stress vV/bd )
• Check critical element force (e.g. wall element
  under high compression/tension)

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Loading Schedule Checking
Check average gravity load (Total DL/Gross Floor
Area 1520 KN/m2
Total axial force 0
Check total wind shear force total wind force
applied at the building
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Q A
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