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Integrated Civil Engineering DesignProject

(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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Case A : 45 storey

Lack of flexibility bystructural element

End wall should beeffectively used as shear

wall to provide betterstiffness

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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 bystructural element

Too much wall

No support forslab

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End wall should beeffectively used as shear

wall to provide betterstiffness

Too much wall Beamahead

bedroom

Wall not allowed

in front of stairs 

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Lintel BeamFor both wind

load and gravityload

Secondary Beamfor gravity load

only

Structural Framing Plan

 Aspect ratio= 45x3/19

=7.0

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Case B: 15 storey

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Columnstructure used

 Aspect ratio= 15x3/60=0.75

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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 transferstructure

►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 sizeof transfer structure size

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Tower Framing plan

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TransferStructure undertower

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Supportingcolumns undertransfer structure

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Otherbeam/columnstructure below

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Otherbeam/columnstructurebelow

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Otherbeam/columnstructure below

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Preliminary Computer Model

►Use the effective members for first model

►

Estimate the member size for model inputbased on gravity load first and provide somereserve for wind load (say 20 ~40% of windload)

►Check top deflection < H/500

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Only analysis the critical wind direction

Only use the effective members for modeling

Minor wall notselected for

preliminarymodeling

Width of building to

calculate the wind load

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Tower model

Podium model

For preliminary model, only typicalfloor is used to simulate the wholetower.

Building height should be

maintained

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Element Checking

►Check critical lintel beam force (e.g. checkwind shear stress v=V/bd )

►Check critical element force (e.g. wallelement under high compression/tension)

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Loading Schedule Checking

Check average gravity load(Total D+L/Gross Floor Area = 15~20 KN/m2

Total axialforce = 0

Check total windshear force = total

wind force applied atthe building

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