HST Tophats Product Information

PURLINS STRUCTURAL

PRODUCT INFORMATION

HST TOPHATS

CODE

OCT 2014

PRODUCT INFORMATION HST TOPHATS

PURLINS STRUCTURAL PRODUCTS

A versatile and easy to use structural product.

Steel & Tube HST Tophat sections are an economical, lightweight, versatile and easy to use product for roof purlins, wall girts, floor joists, and hundreds of other applications such as fencing, carports, racking etc.

Generally, for spans from 3m to 7m, HST Tophat purlins will provide an economical alternative to timber and Cee section purlins.

Tophat purlins are easy to use, being fastened directly to their supports, results in a saving on cleats. The symmetrical section means no braces or nogs are required to prevent twisting and the profile is easily lapped for optimal performance.

DOUBLE SPAN

DURABILITY HST Tophat purlins are manufactured from hot dipped galvanised steel with a coating weight of 275gram/sqm, in line with other common lightweight steel structural building products.

This gives good protection in most exposed internal environments, and for external use in moderate environments. Where used in a lined exterior dwelling a thermal break should be provided between the Tophat and the cladding to avoid thermal bridging. Where sections are exposed to salt spray but not rain washing, maintenance is required to remove any build up of salt deposits on the surface.

SINGLE SPAN

Run off from, or contact with, materials which are incompatible with zinc should be avoided.

HANDLING AND STORAGE HST Tophat sections must be kept dry during storage as water present between close stacked sections will cause premature corrosion. If they become wet they should be separated and stacked openly to allow for ventilation to dry the surface.

DOUBLE SPAN

LENGTHS HST Tophat sections are available in long run lengths up to 12 metres, depending on the available transport and handling facilities.

CUTTING Cutting is preferably done by shear or hacksaw. When using abrasive disc blades care must be taken to ensure the swarf produced does not affect other materials and the burred edge should be cleaned off at the completion of cutting.

LAPPED SPAN

Minimum lap (between fasteners) = 15% of TopHat span 2

HST TOPHATS PRODUCT UPDATE

HST TOPHATS DESIGN CAPACITY TABLES HST TOPHAT SECTIONAL PROPERTIES

TOPHAT SECTION

THICKNESS t(BMT)

AREA

MASS PER UNIT LENGTH

mm

mm2

kg/m

SECOND MOMENT AREA (FULL) lX lY

CENTRE OF SECTION MODULUS GRAVITY (FULL) YC ZX ZY

106mm4

106mm4

mm

RADIUS OF GYRATION rX rY

MONOSHEAR TORSION WARPING SYMMETRY CENTRE CONSTANT CONSTANT CONSTANT YE J lW BX

103mm3

103mm3

mm

mm

mm

mm4

109mm6

mm

60 HST Tophat 0.75 BMT

0.75

150

1.18

0.078

0.119

31.7

2.45

2.20

22.8

28.1

44.2

28.2

16.05

110

60 HST Tophat 0.95 BMT

0.95

190

1.50

0.098

0.151

31.7

3.09

2.78

22.8

28.1

44.2

57.3

20.33

110

100 HST Tophat 0.75 BMT

0.75

248

1.93

0.338

0.439

55.2

6.3

5.39

37.1

42.2

67.4

46.5

238.61

158

100 HST Tophat 0.95 BMT

0.95

314

2.45

0.428

0.556

55.2

7.75

6.83

37.0

42.2

67.4

94.5

302.24

158

120 HST Tophat 0.75 BMT

0.75

278

2.17

0.527

0.519

65.6

8.03

6.13

43.7

43.3

82.3

52.1

363.31

184

120 HST Tophat 0.95 BMT

0.95

352

2.75

0.667

0.657

65.6

10.16

7.76

43.6

43.3

82.3

105.9

460.20

184

150 HST Tophat 0.95 BMT

0.95

410

3.21

1.16

0.878

81.1

14.30

9.60

53.3

46.3

103.9

123.5

758.37

225

150 HST Tophat 1.15 BMT

1.15

497

3.88

1.40

1.06

81.1

17.30

11.62

53.2

46.3

103.9

219.1

918.02

225

TYPICAL HST TOPHAT PURLIN SPANS (MM) REGION 1

PURLIN SPACINGS

60 HST Tophat 0.75 BMT

60 HST Tophat 0.95 BMT

100 HST Tophat 0.75 BMT

100 HST Tophat 0.95 BMT

120 HST Tophat 0.75 BMT

120 HST Tophat 0.95 BMT

150 HST Tophat 0.95 BMT

150 HST Tophat 1.15 BMT

URBAN

RURAL

REGION 2 SECONDARY USE

URBAN

RURAL

SECONDARY USE

(MM)

SIMPLE

LAPPED

SIMPLE

LAPPED

SIMPLE

LAPPED

SIMPLE

LAPPED

SIMPLE

LAPPED

SIMPLE

LAPPED

1200

2200

2800

2000

2600

2600

3200

2100

2700

1900

2500

2500

3200

1800

1800

2400

1700

2300

2100

2700

1800

2300

1700

2200

1900

2500

1200

2300

3000

2200

2900

2700

3600

2300

3100

2100

2700

2700

3600

1800

2000

2700

1900

2500

2400

3100

2000

2600

1800

2400

2300

2900

1200

3600

4600

3200

4200

3600

5400

3400

4400

3000

4000

3400

4800

1800

3200

4000

3000

3700

3800

4600

3000

3800

2800

3600

3600

4000

1200

4000

5000

3700

4700

4300

5400

3800

4800

3600

4500

4000

5800

1800

3500

4400

3200

4100

3600

5000

3400

4200

2900

4000

3400

4800

1200

4300

5400

4000

5000

5100

6000

4200

5200

3900

4800

4900

5800

1800

3400

4800

3000

4400

3400

5300

3200

4500

2800

4200

3200

4900

1200

4800

6000

4400

5600

5100

6300

4600

5600

4200

5400

4800

6200

1800

4200

5200

3800

4900

5000

5800

4000

5000

3700

4600

4400

5600

1200

5600

70000

5000

6600

5600

8000

5200

6800

4800

6400

5200

7800

1800

4600

6200

4100

5800

4600

6800

4200

6000

3900

5500

4200

6600

1200

5100

7700

5700

7200

7000

8000

5800

7400

5200

6900

6200

8000

1800

5000

6800

4800

6300

5000

7800

5000

6500

4600

5500

5000

6800

PERFORMANCE The Typical Spans are designed to give information for preliminary design and costings and are based on the factors noted. Full design Load Tables are available for specific design and Building Consent purposes.

Notes: REGION 1

Auckland, Central North Island, South Island (except Marlborough & Southland).

REGION 2

Northland, Wellington, Marlborough, Southland.

URBAN

Any Built up area with numerous houses/buildings 3 to 5 metres high (Terrain Category 3).

RURAL

Areas with scattered obstructions, hedges, trees, buildings etc. (Terrain Category 2 1/2).

SECONDARY USE

Buildings of low importance (secondary nature) where higher roof deflections are acceptable.

In areas with scattered obstructions, hedges, trees, buildings etc. (Terrain Category 2 1/2).

SNOW

These tables do not apply for elevations in excess of 300 metres or for Canterbury/Otago/Southland above 50 metres. In these areas “Snow Loads” should be considered by a qualified engineer.

FASTENERS

Use 14 gauge tek screws typical.

Use 2 screws at simple ends and 4 screws at lapped supports typically, except: • for fittings to cold rolled purlins with thickness less than 2.5mm BMT, use at simple ends use 2 screws, except use 4 screws for 150 Tophats.

• at lapped supports use 4 screws for 60 Tophats, 6 screws for 100 Tophats, 8 screws for 120 & 150 Tophats.

OR Use strap detail.

LAP

Minimum lap between fixing is 15% of Tophat span.

3

HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - SINGLE SPAN 60 x 0.75 Fixings

Inward

G300 G450

Outward

60 x 0.95 Defl

Inward

2/12 g 2/12 g / 1.2 mm

Outward

100 x 0.75 Defl

Inward

2/12 g 2/12 g / 1.2 mm

Outward

100 x 0.95 Defl

Inward

2/12 g 2/12 g / 1.5 mm

Outward

Defl

2/12 g 2/12 g / 1.5 mm

Span 2.0

2.30

1.56

0.88

3.08

2.11

1.16

4.54

3.10

2.2

1.90

1.29

0.66

2.55

1.75

0.87

3.76

2.66

2.93

2.4

1.60

1.08

0.51

2.14

1.47

0.67

3.16

2.24

2.26

4.72

2.58

3.08

2.6

1.36

0.92

0.40

1.83

1.25

0.53

2.69

1.91

1.78

4.02

2.38

2.42

2.8

1.18

0.80

0.32

1.57

1.08

0.42

2.32

1.64

1.42

3.47

2.21

1.94

3.0

1.37

0.94

0.34

2.02

1.43

1.16

3.02

2.00

1.58

3.2

1.20

0.83

0.28

1.78

1.26

0.95

2.66

1.76

1.30 1.08

3.90

3.4

1.07

0.73

0.24

1.57

1.11

0.79

2.35

1.56

3.6

0.95

0.65

0.20

1.40

0.99

0.67

2.10

1.39

0.91

1.26

0.89

0.57

1.88

1.25

0.78

3.8 4.0

1.14

0.81

0.49

1.70

1.13

0.67

4.2

1.03

0.73

0.42

1.54

1.02

0.58

4.4

0.94

0.67

0.37

1.40

0.93

0.50

4.6

0.86

0.61

0.32

1.28

0.85

0.44

4.8

0.79

0.56

0.28

1.18

0.78

0.39

5.0

0.73

0.52

0.25

1.09

0.72

0.34 0.30

5.2

1.01

0.67

5.4

0.93

0.62

0.27

5.6

0.87

0.57

0.24

5.8 6.0 6.2 6.4 6.6 6.8 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0

2. Loads

3.Fasteners

4. Bracing

4

32

HST Tophats are rolled from galvanised high strength steel strip Grade 500 (with Zinc Weight 275 gm/m2).

The loads are ‘Limit-State’ loads to ‘NZS4203-1992’.

Defl are serviceability loads, based on defection equal to span/150.

Outward loads must be adjusted if alternative screw fixings or support member thicknesses are used.

G300 option - 2.12g indicates 2 off 12 gauge tek screws and assumes a support member minimum thickness of 3 millimetres for Grade 300 steel or a minimum embedment of 37mm into timber with T17 screws.

G450 option - 2/14g1.5mm indicates the number and gauge of fixings to cold rolled (g450/500) steel and the thickness of the support member.

Outward loads shall be adjusted to a lower value if less screws or thinner support members are used.

Battens screwed transversely along the underside the purlins will enhance the performance of the tophat purlins and are recommended where supports/restraints are further apart than 30x the tophat depth.

HST TOPHATS PRODUCT UPDATE

60

Notes: 1. Material

Centroid

65 108

HST 60 TOPHAT

HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - SINGLE SPAN 120 x 0.75 Fixings

Inward

G300 G450

120 x 0.95

Outward

Defl

Inward

2/14 g 2/14 g / 1.5 mm

150 x 0.95

Outward

Defl

Inward

2/14 g 2/14 g / 1.5 mm

150 x 1.15

Outward

Defl

Inward

2/14 g 2/14 g / 1.5 mm

Outward

Defl

2/14 g 2/14 g / 1.5 mm

Span 2.0 2.2 2.4

3.82

2.67

3.34

2.6

3.26

2.27

2.62

4.85

3.43

3.73

2.8

2.81

1.96

2.10

4.18

2.96

2.99

3.0

2.45

1.71

1.71

3.64

2.58

2.43

3.2

2.15

1.50

1.41

3.20

2.26

2.00

3.4

1.90

1.33

1.17

2.84

2.01

1.67

3.6

1.70

1.19

0.99

2.53

1.79

1.41

3.18

2.20

3.8

1.52

1.06

0.84

2.27

1.61

1.19

2.85

1.97

1.93

3.94

2.42

4.0

1.38

0.96

0.72

2.05

1.45

1.02

2.57

1.78

1.65

3.56

2.30

2.19

4.2

1.25

0.87

0.62

1.86

1.31

0.88

2.33

1.62

1.43

3.23

2.19

1.90

4.4

1.14

0.79

0.54

1.69

1.20

0.77

2.13

1.47

1.24

2.94

2.09

1.65

4.6

1.04

0.73

0.47

1.55

1.10

0.67

1.95

1.35

1.09

2.69

1.91

1.44

4.8

0.96

0.67

0.42

1.42

1.01

0.59

1.79

1.24

0.96

2.47

1.75

1.27

5.0

0.88

0.61

0.37

1.31

0.93

0.52

1.65

1.14

0.85

2.28

1.62

1.12

5.2

0.81

0.57

0.33

1.21

0.86

0.47

1.52

1.05

0.75

2.11

1.50

1.00

2.26 2.56

5.4

0.75

0.53

0.29

1.12

0.79

0.42

1.41

0.98

0.67

1.95

1.39

0.89

5.6

0.70

0.49

0.26

1.05

0.74

0.37

1.31

0.91

0.60

1.82

1.29

0.80

5.8

0.65

0.46

0.24

0.97

0.69

0.34

1.22

0.85

0.54

1.69

1.20

0.72

0.91

0.64

0.30

1.14

0.79

0.49

1.58

1.12

0.65

6.2

0.85

0.60

0.28

1.07

0.74

0.44

1.48

1.05

0.59

6.4

0.80

0.57

0.25

1.00

0.70

0.40

1.39

0.99

0.54

6.0

6.6

0.94

0.65

0.37

1.31

0.93

0.49

6.8

0.89

0.62

0.34

1.23

0.87

0.45

7.0

0.84

0.58

0.31

1.16

0.83

0.41

7.2

0.79

0.55

0.28

1.10

0.78

0.38

7.4

0.75

0.52

0.26

1.04

0.74

0.35

7.6

0.71

0.49

0.24

0.99

0.70

0.32

7.8

0.94

0.66

0.30

8.0

0.89

0.63

0.27

8.2 8.4 8.6 8.8 9.0 43

45

Centroid

R3 (T YP )

10

45°

100

5

3

2

R3 (T YP )

91 163

HST 100 TOPHAT 5

HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - LAPPED SPANS 60 x 0.75 Fixings

Inward

G300 G450

Outward

60 x 0.95 Defl

Inward

2/12 g 4/12 g / 1.2 mm

Outward

100 x 0.75 Defl

Inward

2/12 g 4/12 g / 1.2 mm

Outward

100 x 0.95 Defl

Inward

4/12 g 4/12 g / 1.5mm

Outward

Defl

4/12 g 6/12 g / 1.5 mm

Span 2.0

3.37

2.40

1.89

4.58

2.48

2.46

7.38

3.36

8.27

2.2

2.69

2.10

1.42

3.65

2.25

1.85

6.10

3.05

8.22

2.4

2.16

1.76

1.09

2.94

2.07

1.43

5.13

2.80

4.79

7.67

4.20

6.43

2.6

1.76

1.50

0.86

2.39

1.91

1.12

4.37

2.58

3.77

6.54

3.88

5.06

2.8

1.44

1.29

0.69

1.96

1.75

0.90

3.77

2.40

3.02

5.64

3.60

4.05

3.0

1.19

1.13

0.56

1.61

1.53

0.73

3.28

2.24

2.45

4.91

3.36

3.29

3.2

1.05

0.99

0.46

1.42

1.34

0.60

2.88

2.10

2.02

4.31

3.15

2.71

3.4

0.93

0.88

0.38

1.26

1.19

0.50

2.56

1.98

1.68

3.82

2.96

2.26

3.6

0.83

0.78

0.32

1.12

1.06

0.42

2.28

1.87

1.42

3.41

2.80

1.9

3.8

1.01

0.95

0.36

2.05

1.77

1.21

3.06

2.65

1.62

4.0

0.91

0.86

0.31

1.85

1.68

1.03

2.76

2.52

1.39

1.67

1.60

0.89

2.50

2.40

1.20 1.04

4.2 4.4

1.53

1.53

0.78

2.28

2.27

4.6

1.40

1.46

0.68

2.09

2.07

0.91

4.8

1.28

1.36

0.60

1.92

1.90

0.80

5.0

1.18

1.25

0.53

1.77

1.76

0.71

5.2

1.09

1.16

0.47

1.63

1.62

0.63 0.56

5.4

1.01

1.07

0.42

1.52

1.50

5.6

0.94

1.00

0.38

1.41

1.40

0.51

5.8

0.88

0.93

0.34

1.31

1.30

0.46

6.0

0.82

0.87

0.31

1.23

1.22

0.41

6.2

1.15

1.14

0.37 0.34

6.4

1.08

1.07

6.6

1.01

1.01

0.31

6.8

0.96

0.95

0.28

7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0

Notes: 1. Material

6

HST TOPHATS PRODUCT UPDATE

2

43

R3 (T YP )

120

3

5

65

Centroid R3 (T YP )

10

HST Tophats are rolled from galvanised high strength steel strip Grade 500 (with Zinc Weight 275 gm/m2).

2. Loads The loads are ‘Limit-State’ loads to ‘NZS4203-1992’.

Defl are serviceability loads, based on defection equal to span/150.

Outward loads must be adjusted if alternative screw fixings or support member thicknesses are used.

3. Fasteners G300 option - 2.12g indicates 2 off 12 gauge tek screws and assumes a support member minimum thickness of 3 millimetres for Grade 300 steel or a minimum embedment of 37mm into timber with T17 screws.

G450 option - 2/14g1.5mm indicates the number and gauge of fixings to cold rolled (g450/500) steel and the thickness of the support member.

Outward loads shall be adjusted to a lower value if less screws or thinner support members are used.

4. Lapping Laps shall be a minimum of 15% of the span between supports, measured between the lap screws. Provide 2 screws at lap ends for 60/100 tophats and 4 screws for 120/150 tophats.

5. Bracing Battens screwed transversely along the underside the purlins will enhance the performance of the tophat purlins and are recommended where supports/restraints are further apart than 30x the tophat depth.

98 170

HST 120 TOPHAT

HST TOPHATS DESIGN CAPACITY TABLES UNIFORMLY DISTRIBUTED LOAD - LAPPED SPANS 120 x 0.75 Fixings

Inward

G300 G450

Outward

120 x 0.95 Defl

Inward

4/12 g 6/12 g / 1.5 mm

Outward

150 x 0.95 Defl

Inward

4/14 g 6/14 g / 1.5 mm

150 x 1.15

Outward

Defl

Inward

4/14 g 6/14 g / 1.5 mm

Outward

Defl

6/14 g 8/14 g / 1.5 mm

Span 2.0 2.2 2.4

5.14

4.60

2.6

4.74

4.25

7.26 5.71

3.43

3.73

2.8

4.41

3.94

4.57

2.96

2.99

3.0

3.97

3.68

3.72

5.92

3.68

5.08

3.2

3.49

3.45

3.06

5.20

3.45

4.19

3.4

3.09

3.24

2.55

4.61

3.25

3.49

3.6

2.76

2.89

2.15

4.11

3.07

2.94

5.16

3.07

3.8

2.48

2.59

1.83

3.69

2.91

2.50

4.63

2.91

4.90 4.17

6.41

3.87

5.35

4.0

2.24

2.34

1.57

3.33

2.76

2.15

4.18

2.76

3.58

5.78

3.68

4.58

4.2

2.03

2.12

1.36

3.02

2.63

1.85

3.79

2.63

3.09

5.25

3.50

3.96

4.4

1.85

1.93

1.18

2.75

2.51

1.61

3.46

2.51

2.69

4.78

3.35

3.44

4.6

1.69

1.77

1.03

2.52

2.40

1.41

3.16

2.40

2.35

4.37

3.20

3.01

4.8

1.55

1.63

0.91

2.31

2.300

1.24

2.90

2.30

2.07

4.02

3.07

2.65

5.0

1.43

1.50

0.80

2.13

2.21

1.10

2.68

2.21

1.83

3.70

2.94

2.35

5.2

1.32

1.39

0.71

1.97

2.08

0.98

2.47

2.12

1.63

3.42

2.83

2.09 1.86

5.4

1.23

1.28

0.64

1.83

1.93

0.87

2.29

2.04

1.45

3.17

2.73

5.6

1.14

1.19

0.57

1.70

1.80

0.78

2.13

1.97

1.30

2.95

2.63

1.67

5.8

1.06

1.11

0.51

1.58

1.67

0.70

1.99

1.90

1.17

2.75

2.54

1.50

6.0

0.99

1.04

0.46

1.48

1.56

0.64

1.86

1.84

1.06

2.57

2.45

1.36

6.2

0.93

0.97

0.42

1.39

1.47

0.58

1.74

1.78

0.96

2.41

2.37

1.23

6.4

0.87

0.91

0.38

1.30

1.38

0.52

1.63

1.70

0.87

2.26

2.30

1.12

6.6

0.82

0.86

0.35

1.22

1.29

0.48

1.54

1.59

0.80

2.12

2.23

1.02

6.8

0.77

0.81

0.32

1.15

1.22

0.44

1.45

1.50

0.73

2.00

2.12

0.93

7.0

0.73

0.76

0.29

1.09

1.15

0.40

1.37

1.42

0.67

1.89

2.00

0.86

7.2

0.69

0.72

0.27

0.79

1.03

1.09

0.37

1.29

1.34

0.61

1.79

1.89

7.4

0.97

1.03

0.34

1.22

1.27

0.56

1.69

1.79

0.72

7.6

0.92

0.98

0.31

1.16

1.20

0.52

1.60

1.69

0.67

7.8

0.88

0.93

0.29

1.10

1.14

0.48

1.52

1.61

0.62

8.0

0.83

0.88

0.27

1.05

1.09

0.45

1.45

1.53

0.57

8.2

0.99

1.03

0.42

1.38

1.46

0.53

8.4

0.95

0.98

0.39

1.31

1.39

0.49

8.6

0.90

0.94

0.36

0.46

1.25

1.32

8.8

1.20

1.25

0.43

9.0

1.14

1.21

0.40

R3 (T YP )

2

43

100

150

3

5

Centroid

10

R3 (T YP ) 110 183

HST 150 TOPHAT 7

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