Alfred Vinyu 210044535 Construction and Detailing 2 : House Tzaneen Analysis

CTD 2 –Exercise 2 : Analysis of Timber Framed Residence – House Tzaneen

Primary Structure

The primary structure acts as the main framework of a building. The primary structure transmits the loads exerted on the building. These

forces can be

Wind forces

Dead loads – the actual weight of the structure itself

Live loads – the load exerted by people and other weights in the structure.

For House Tzaneen, the primary structure is composed of the vertical posts, the masonry core and the foundations

Secondary Structure

The secondary structure is fixed to the primary structure. The secondary structure is mainly incorporated to support the primary structure and

add stability by bracing and preventing the primary structure from failing due to forces exerted upon it. The secondary structure is composed

of the horizontal joists, horizontal beams and the diagonal timber members for bracing.

Tertiary Structure

The tertiary structure is the cladding elements of the structure. These serve to enclose the structure and do not provide any structural support.

The tertiary structure also serves as an aesthetic element for the structure. The tertiary structure is composed of timber slats to prevent glare,

the corrugated roofing material, the windows and doors which enclose the structure.

Alfred Vinyu 210044535 Construction and Detailing 2: House Tzaneen Analysis

Primary Structure –. Vertical poles,

foundations and masonry core.

1:100 draught of House Tzaneen

Secondary Structure – Horizontal

beams and joists. Diagonal poles

Tertiary Structure – Roof sheeting,

windows, doors. Enclosing elements..

Alfred Vinyu 210044535 Construction and Detailing 2 : House Tzaneen Analysis

The primary structure is composed of mainly the gum poles which are posts,

the roof truss and the main central masonry core area.

The posts are paired together to withstand vertical downward force exerted

upon them by gravity. Due to timber being flexible and being susceptible to

buckling, pairing also adds strength and support against this as well as

resistance to lateral deflection from wind. The posts are also used as support

for the different floor levels with beams fixed in between them as well as the

roof.

Structural masonry walls provide support for the ground as well as 1st floor

WC. A concrete slab is used instead of timber to deal with point loads from

the WC.

Foundation for the walls helps distribute vertical downward forces exerted

from walls. The concrete footings anchor the poles embedded into the ground

and prevent movement.

The primary structure in essence withstands, wind forces, live-loads and

dead-loads.

Primary Structure

Alfred Vinyu 210044535 Construction and Detailing 2: House Tzaneen Analysis

A vertical roof brace supports the rafters and

adds stability.

The beam stabilizes the roof structure as it

is connected to the structural core walls

The beams upon which the joists are fixed

onto play a secondary function of supporting

the joists for the different floor levels.

The masonry walls have a secondary

function of acting as stability against

lateral forces and brace the structure.

The diagonal brace helps to transfer force

back to the strong core thereby avoiding

topling of outer posts as forces are transferred

back to the middle of the structure.

Secondary Structure

The tertiary structure is composed of the corrugated roofing, timber slats that filter the sun and the windows and doors which are the structural

enclosing elements and play no role in the structural stability of the house.

Tertiary Structure

References:

Rodseth, M. Principles of Structure in Buildings.

Available http://dl.dropbox.com/u/29112329/CTD%202%20 NOTES principles%20of%20structure%20in%20buildings.pdf (2011/06/04)

Available http://www.colorcoat-online.com/en/technical/functional_design/buliding_structure/ (2011/06/27)

Available http://www.aspenpitkin.com/Portals/0/docs/City/Comdev/HPC/chapter_8.pdf (2011/06/27)