2nd year architectural technology 2011

CTD exercise 3

09.06.2011 Steel framed residential structures: House Sue, by Derick de Bruyn House Sue makes use of a steel framed structure in the form of a portal frame structure, namely a haunched portal frame.

The primary structure is made up of I-beam or H-beam, which are hot-rolled steel sections which deal well with bending moments, axial loads and shear forces. The sections are pre-fabricated for on site assembly with calculated moment-resisting connectors at the eaves and crown, where the maximum moments occur, to transfer horizontal thrusts downwards. These connectors ate the key to making the structure work as they resist lateral and gravity loadings.

The secondary structure is the channel purlins and the brickwork. The frames will stand without these elements but they form an essential part of the structure by connecting the individual frames and adding to their strength. Even though lightweight cladding could be used to enclose the entire structure, the brickwork serves to enclose the space with a means of impact resistance and it will resist, to an extent, the warping/buckling of the frame during a fire.

The tertiary structure is the cladding/finishing. Whether it is glass or sheeting, the structure will stand strong without these elements. They exist to enclose the space and keep out the elements.

SECTION

10

1

3

2

4

5 6

7

8

9

4

2

3

11

12

13

4

7

14

15

E,J,

EAVE DETAIL WALL/STANCHION FIXING

18

Fd

c

t

Fh

Fd

Fd

Fh

Fu

1. Crown connector/gusset plate 2. Eave connector/knee gusset 3. Reinforcing 4. Stanchion/column 5. Base plate

6. Holding down bolts 7. Brickwork 8. Floor Slab 9. Skylight 10. RC pad foundation

11. ‘C’ channel purlin 12. Roof sheeting 13. High-tensile holding bolts 14. Beam/Girder 15. Hoop iron ‘shotnailed’ to into beam & built

into brickwork

LEGEND:

Yusuf Sampson 210044594 References:

M. Rodseth, Principles of Structure in buildings, .PDF ‘Ora. Joubert, 10 years 100 buildings, 2009, Bell Roberts Publishing R. Chudley, Building Construction Handbook, 2006, Butterworth-Heinemann