CodeChronicle

OBC 2006 Division B

9.23.4.3.

Version 0 — in force 31 December 2006

In force
Verified · covered Verified against the 2006-12-31–2007-04-01 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 9.23.4.3. — Pro

Base · O. Reg. 350/06 · ext← current

Original — base regulation

O. Reg. 503/09, cl. 210(2) · ext v1 →

In force 2010-01-01

Next: O. Reg. 503/09, cl. 210(2) · ext (not in force until 2010-01-01) v1 →

OBC 2012 · continues as 9.23.4.3. — Pro

9.23.4.3. — Steel Beams

(1) The spans for steel beams with laterally supported top flanges shall conform to Table 9.23.4.3. for floors and Tables A-20 to A-29 for roofs and floors.

(2) Beams described in Sentence (1) shall at least meet the requirements for Grade 350 W steel in CAN/CSA-G40.21, “Structural Quality Steel”.

(3) A beam may be considered to be laterally supported if,

(a) the wood joists bear on its top flange at intervals of 600 mm or less over its entire length,

(b) the load being applied to this beam is transmitted through the joists, and

(c) 19 mm by 38 mm wood strips in contact with the top flange are nailed on both sides of the beam to the bottom of the joist supported.

Text · e-Laws consolidated snapshot

Table 9.23.4.3. Maximum Spans for Steel Beams Supporting Floors in Dwelling Units Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Supported Joist Length, m (Half the sum of joist spans on both sides of the beam)

2.4

3.0

3.6

4.2

4.8

5.4

6.0

Section

One Storey Supported

W150 × 22

5.5

5.2

4.9

4.8

4.6

4.5

4.3

W200 × 21

6.5

6.2

5.9

5.7

5.4

5.1

4.9

W200 × 27

7.3

6.9

6.6

6.3

6.1

5.9

5.8

W200 × 31

7.8

7.4

7.1

6.8

6.6

6.4

6.2

W250 × 24

8.1

7.6

7.3

7.0

6.6

6.2

5.9

W250 × 33

9.2

8.7

8.3

8.0

7.7

7.5

7.3

W250 × 39

10.0

9.4

9.0

8.6

8.4

8.1

7.9

W310 × 31

10.4

9.8

9.4

8.9

8.4

8.0

7.6

W310 × 39

11.4

10.7

10.2

9.8

9.5

9.2

9.0

Section

Two Storeys Supported

W150 × 22

4.9

4.4

4.1

3.8

3.5

3.4

3.2

W200 × 21

5.6

5.1

4.6

4.3

4.1

3.8

3.7

W200 × 27

6.4

6.1

5.6

5.3

4.9

4.7

4.4

W200 × 31

6.9

6.5

6.2

5.8

5.4

5.1

4.9

W250 × 24

6.8

6.1

5.6

5.2

4.9

4.6

4.4

W250 × 33

8.2

7.7

7.0

6.5

6.1

5.8

5.5

W250 × 39

8.8

8.3

7.8

7.2

6.8

6.4

6.1

W310 × 31

8.7

7.8

7.2

6.7

6.2

5.9

5.6

W310 × 39

10.0

9.3

8.5

7.9

7.4

7.0

6.7

Table A-20 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Exterior Stud Walls with Brick Veneer – 1.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

1.0

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

2.96

2.79

2.86

2.71

2.78

2.65

2.71

2.59

W 150 × 30

3.32

3.14

3.22

3.05

3.13

2.98

3.04

2.91

W 150 × 37

3.62

3.41

3.50

3.32

3.40

3.24

3.32

3.17

W 200 × 27

3.80

3.59

3.68

3.49

3.58

3.41

3.49

3.33

W 200 × 31

4.06

3.83

3.93

3.73

3.82

3.64

3.72

3.56

W 200 × 36

4.17

3.94

4.04

3.83

3.93

3.74

3.82

3.65

W 200 × 42

4.42

4.18

4.29

4.06

4.16

3.96

4.05

3.87

W 250 × 33

4.71

4.44

4.56

4.32

4.43

4.22

4.31

4.12

W 250 × 39

5.04

4.76

4.88

4.63

4.75

4.52

4.62

4.41

W 250 × 49

5.32

5.02

5.15

4.89

5.01

4.77

4.87

4.66

W 310 × 39

5.66

5.34

5.49

5.20

5.33

5.07

5.19

4.96

W 310 × 45

5.96

5.62

5.77

5.47

5.61

5.34

5.46

5.22

W 310 × 52

6.33

5.98

6.13

5.82

5.96

5.67

5.8

5.54

W 310 × 60

6.50

6.14

6.30

5.98

6.12

5.83

5.96

5.69

W 360 × 33

5.61

5.29

5.43

5.15

5.28

5.03

5.14

4.91

W 360 × 39

6.01

5.68

5.83

5.53

5.66

5.39

5.51

5.27

W 360 × 45

6.38

6.03

6.19

5.87

6.01

5.72

5.85

5.59

W 360 × 51

6.70

6.32

6.49

6.16

6.31

6.00

6.14

5.87

W 360 × 57

7.00

6.61

6.78

6.43

6.59

6.28

6.42

6.13

Table A-21 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Interior Stud Walls or Exterior Stud Walls with Siding – 1.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

1.0

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

4.20

3.82

3.98

3.67

3.81

3.51

3.66

3.35

W 150 × 30

4.72

4.30

4.48

4.13

4.28

3.98

4.11

3.85

W 150 × 37

5.14

4.68

4.88

4.49

4.66

4.33

4.48

4.19

W 200 × 27

5.41

4.92

5.13

4.72

4.90

4.56

4.71

4.41

W 200 × 31

5.77

5.25

5.48

5.04

5.23

4.86

5.02

4.71

W 200 × 36

5.93

5.40

5.63

5.18

5.38

5.00

5.16

4.84

W 200 × 42

6.29

5.72

5.97

5.50

5.70

5.30

5.47

5.13

W 250 × 33

6.69

6.09

6.35

5.85

6.06

5.64

5.82

5.45

W 250 × 39

7.17

6.52

6.80

6.26

6.49

6.04

6.24

5.85

W 250 × 49

7.56

6.88

7.17

6.61

6.85

6.37

6.58

6.17

W 310 × 39

8.05

7.32

7.63

7.03

7.29

6.78

7.01

6.56

W 310 × 45

8.47

7.71

8.03

7.40

7.68

7.14

7.37

6.91

Table A-22 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Exterior Stud Walls with Brick Veneer – 1.5 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

1.5

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

2.86

2.71

2.74

2.62

2.64

2.53

2.55

2.46

W 150 × 30

3.22

3.05

3.08

2.94

2.97

2.85

2.87

2.76

W 150 × 37

3.50

3.32

3.36

3.20

3.23

3.10

3.13

3.01

W 200 × 27

3.68

3.49

3.53

3.37

3.40

3.26

3.29

3.16

W 200 × 31

3.93

3.73

3.77

3.60

3.63

3.48

3.51

3.38

W 200 × 36

4.04

3.83

3.88

3.70

3.73

3.58

3.61

3.47

W 200 × 42

4.29

4.06

4.11

3.92

3.96

3.79

3.82

3.68

W 250 × 33

4.56

4.32

4.37

4.17

4.21

4.03

4.07

3.91

W 250 × 39

4.88

4.63

4.68

4.47

4.51

4.32

4.36

4.19

W 250 × 49

5.15

4.89

4.94

4.71

4.76

4.56

4.60

4.42

W 310 × 39

5.49

5.20

5.26

5.01

5.06

4.85

4.89

4.71

W 310 × 45

5.77

5.47

5.53

5.28

5.33

5.11

5.15

4.95

W 310 × 52

6.13

5.82

5.88

5.61

5.66

5.43

5.47

5.26

W 310 × 60

6.30

5.98

6.04

5.76

5.81

5.57

5.62

5.41

W 360 × 33

5.43

5.15

5.21

4.97

5.01

4.81

4.85

4.66

W 360 × 39

5.83

5.53

5.58

5.33

5.38

5.15

5.20

5.00

W 360 × 45

6.19

5.87

5.93

5.65

5.71

5.47

5.52

5.31

W 360 × 51

6.49

6.16

6.22

5.93

5.99

5.74

5.79

5.57

W 360 × 57

6.78

6.43

6.50

6.20

6.26

6.00

6.05

5.82

Table A-23 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Interior Stud Walls or Exterior Stud Walls with Siding – 1.5 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

1.5

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

3.98

3.67

3.73

3.48

3.53

3.30

3.36

3.12

W 150 × 30

4.48

4.13

4.19

3.91

3.97

3.74

3.78

3.59

W 150 × 37

4.88

4.49

4.56

4.26

4.32

4.07

4.12

3.91

W 200 × 27

5.13

4.72

4.80

4.48

4.54

4.28

4.33

4.11

W 200 × 31

5.48

5.04

5.12

4.78

4.85

4.57

4.62

4.39

W 200 × 36

5.63

5.18

5.27

4.92

4.98

4.70

4.75

4.51

W 200 × 42

5.97

5.50

5.58

5.21

5.28

4.98

5.04

4.78

W 250 × 33

6.35

5.85

5.94

5.54

5.62

5.30

5.36

5.09

W 250 × 39

6.80

6.26

6.36

5.94

6.02

5.67

5.74

5.45

W 250 × 49

7.17

6.61

6.71

6.27

6.35

5.99

6.06

5.75

W 310 × 39

7.63

7.03

7.14

6.67

6.76

6.37

6.45

6.12

W 310 × 45

8.03

7.40

7.52

7.02

7.11

6.71

6.78

6.44

Table A-24 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Exterior Stud Walls with Brick Veneer – 2.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

2

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

2.78

2.65

2.64

2.53

2.53

2.43

2.43

2.35

W 150 × 30

3.13

2.98

2.97

2.85

2.84

2.74

2.73

2.64

W 150 × 37

3.40

3.24

3.23

3.10

3.09

2.98

2.97

2.88

W 200 × 27

3.58

3.41

3.40

3.26

3.25

3.13

3.13

3.02

W 200 × 31

3.82

3.64

3.63

3.48

3.47

3.34

3.34

3.23

W 200 × 36

3.93

3.74

3.73

3.58

3.57

3.44

3.43

3.32

W 200 × 42

4.16

3.96

3.96

3.79

3.78

3.64

3.64

3.52

W 250 × 33

4.43

4.22

4.21

4.03

4.02

3.88

3.87

3.74

W 250 × 39

4.75

4.52

4.51

4.32

4.31

4.15

4.15

4.01

W 250 × 49

5.01

4.77

4.76

4.56

4.55

4.38

4.37

4.23

W 310 × 39

5.33

5.07

5.06

4.85

4.84

4.66

4.65

4.50

W 310 × 45

5.61

5.34

5.33

5.11

5.10

4.91

4.90

4.74

W 310 × 52

5.96

5.67

5.66

5.43

5.41

5.21

5.21

5.03

W 310 × 60

6.12

5.83

5.81

5.57

5.56

5.36

5.35

5.17

W 360 × 33

5.28

5.03

5.01

4.81

4.80

4.62

4.61

4.46

W 360 × 39

5.66

5.39

5.38

5.15

5.14

4.95

4.94

4.78

W 360 × 45

6.01

5.72

5.71

5.47

5.46

5.26

5.25

5.08

W 360 × 51

6.31

6.00

5.99

5.74

5.73

5.52

5.51

5.33

W 360 × 57

6.59

6.28

6.26

6.00

5.99

5.77

5.76

5.57

Table A-25 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Interior Stud Walls or Exterior Stud Walls with Siding – 2.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

2.0

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

3.81

3.54

3.53

3.33

3.32

3.13

3.15

2.94

W 150 × 30

4.28

3.98

3.97

3.74

3.73

3.55

3.54

3.39

W 150 × 37

4.66

4.33

4.32

4.70

4.06

3.86

3.85

3.69

W 200 × 27

4.90

4.56

4.54

4.28

4.27

4.06

4.05

3.88

W 200 × 31

5.23

4.86

4.85

4.57

4.56

4.34

4.32

4.14

W 200 × 36

5.38

5.00

4.98

4.07

4.68

4.46

4.45

4.26

W 200 × 42

5.70

5.30

5.28

4.98

4.96

4.72

4.71

4.51

W 250 × 33

6.06

5.64

5.62

5.30

5.28

5.03

5.01

4.80

W 250 × 39

6.49

6.04

6.02

5.67

5.66

5.38

5.37

5.14

W 250 × 49

6.85

6.37

6.35

5.99

5.97

5.68

5.67

5.43

W 310 × 39

7.29

6.78

6.76

6.37

6.35

6.04

6.03

5.77

W 310 × 45

7.68

7.14

7.11

6.71

6.69

6.36

6.35

6.08

Table A-26 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Exterior Stud Walls with Brick Veneer – 2.5 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

2.5

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

2.71

2.59

2.55

2.46

2.43

2.35

2.33

2.26

W 150 × 30

3.04

2.91

2.87

2.76

2.73

2.64

2.62

2.54

W 150 × 37

3.32

3.17

3.13

3.01

2.97

2.88

2.85

2.77

W 200 × 27

3.49

3.33

3.29

3.16

3.13

3.02

2.99

2.91

W 200 × 31

3.72

3.56

3.51

3.38

3.34

3.23

3.20

3.10

W 200 × 36

3.82

3.65

3.61

3.47

3.43

3.32

3.29

3.19

W 200 × 42

4.05

3.87

3.82

3.68

3.64

3.52

3.48

3.38

W 250 × 33

4.31

4.12

4.07

3.91

3.87

3.74

3.71

3.60

W 250 × 39

4.62

4.41

4.36

4.19

4.15

4.01

3.97

3.85

W 250 × 49

4.87

4.66

4.60

4.42

4.37

4.23

4.19

4.07

W 310 × 39

5.19

4.96

4.89

4.71

4.65

4.50

4.46

4.33

W 310 × 45

5.46

5.22

5.15

4.95

4.90

4.74

4.69

4.55

W 310 × 52

5.80

5.54

5.47

5.26

5.21

5.03

4.98

4.84

W 310 × 60

5.96

5.69

5.62

5.41

5.35

5.17

5.12

4.97

W 360 × 33

5.14

4.91

4.85

4.66

4.61

4.46

4.42

4.29

W 360 × 39

5.51

5.27

5.20

5.00

4.94

4.78

4.73

4.60

W 360 × 45

5.85

5.59

5.52

5.31

5.25

5.08

5.03

4.88

W 360 × 51

6.14

5.87

5.79

5.57

5.51

5.33

5.27

5.12

W 360 × 57

6.42

6.13

6.05

5.82

5.76

5.57

5.51

5.35

Table A-27 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Interior Stud Walls or Exterior Stud Walls with Siding – 2.5 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

2.5

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

3.66

3.43

3.36

3.19

3.15

2.98

2.98

2.79

W 150 × 30

4.11

3.85

3.78

3.59

3.54

3.39

3.35

3.23

W 150 × 37

4.48

4.19

4.12

3.91

3.85

3.69

3.64

3.51

W 200 × 27

4.71

4.41

4.33

4.11

4.05

3.88

3.83

3.69

W 200 × 31

5.02

4.71

4.62

4.39

4.32

4.14

4.09

3.94

W 200 × 36

5.16

4.84

4.75

4.51

4.45

4.26

4.21

4.05

W 200 × 42

5.47

5.13

5.04

4.78

4.71

4.51

4.46

4.30

W 250 × 33

5.82

5.46

5.36

5.09

5.01

4.80

4.74

4.54

W 250 × 39

6.24

5.85

5.74

5.45

5.37

5.14

5.08

4.90

W 250 × 49

6.58

6.17

6.06

5.75

5.67

5.43

5.36

5.17

W 310 × 39

7.01

6.56

6.45

6.12

6.03

5.78

5.70

5.47

W 310 × 45

7.37

6.91

6.78

6.44

6.35

6.08

6.00

5.79

Table A-28 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Exterior Stud Walls with Brick Veneer – 3.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

3.0

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

2.64

2.53

2.48

2.39

2.35

2.28

2.24

2.18

W 150 × 30

2.97

2.85

2.78

2.69

2.64

2.56

2.52

2.45

W 150 × 37

3.23

3.10

3.03

2.93

2.87

2.79

2.74

2.67

W 200 × 27

3.40

3.26

3.19

3.08

3.02

2.93

2.88

2.81

W 200 × 31

3.63

3.48

3.40

3.28

3.22

3.13

3.08

3.00

W 200 × 36

3.73

3.58

3.50

3.38

3.31

3.21

3.16

3.08

W 200 × 42

3.96

3.79

3.71

3.58

3.51

3.41

3.35

3.26

W 250 × 33

4.21

4.03

3.94

3.81

3.74

3.62

3.57

3.47

W 250 × 39

4.51

4.32

4.23

4.08

4.00

3.88

3.82

3.72

W 250 × 49

4.76

4.56

4.46

4.30

4.22

4.10

4.03

3.93

W 310 × 39

5.06

4.85

4.74

4.58

4.49

4.36

4.29

4.18

W 310 × 45

5.33

5.11

4.99

4.82

4.73

4.59

4.51

4.40

W 310 × 52

5.66

5.43

5.31

5.12

5.03

4.88

4.80

4.67

W 310 × 60

5.81

5.57

5.45

5.26

5.16

5.01

4.93

4.80

W 360 × 33

5.01

4.81

4.70

4.54

4.45

4.32

4.25

4.14

W 360 × 39

5.38

5.15

5.04

4.86

4.77

4.63

4.56

4.44

W 360 × 45

5.71

5.47

5.35

5.16

5.07

4.92

4.84

4.71

W 360 × 51

5.99

5.74

5.61

5.42

5.32

5.16

5.08

4.94

W 360 × 57

6.26

6.00

5.87

5.66

5.56

5.39

5.31

5.17

Table A-29 Maximum Spans for Steel Beams Supporting a Roof and one Floor in Dwelling Units Where Beams Support Interior Stud Walls or Exterior Stud Walls with Siding – 3.0 kPa Specified Roof Design Snow Load Forming Part of Sentence 9.23.4.3 (1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Maximum Span, m

Roof Live Load, kPa

3.0

Supported Roof Length, m

2.4

3.6

4.8

6.0

Supported Floor Length, m

2.4

3.6

2.4

3.6

2.4

3.6

2.4

3.6

Steel Beam Section

W 150 × 22

3.53

3.33

3.23

3.08

3.01

2.85

2.83

2.66

W 150 × 30

3.97

3.74

3.63

3.47

3.38

3.26

3.19

3.09

W 150 × 37

4.32

4.07

3.95

3.77

3.68

3.55

3.48

3.37

W 200 × 27

4.54

4.28

4.15

3.97

3.87

3.73

3.65

3.52

W 200 × 31

4.85

4.57

4.43

4.23

4.13

3.98

3.90

3.78

W 200 × 36

4.98

4.70

4.56

4.35

4.25

4.09

4.01

3.88

W 200 × 42

5.28

4.98

4.83

4.61

4.50

4.34

4.25

4.12

W 250 × 33

5.62

5.30

5.14

4.91

4.79

4.61

4.52

4.33

W 250 × 39

6.02

5.67

5.51

5.26

5.13

4.94

4.84

4.69

W 250 × 49

6.35

5.99

5.81

5.55

5.42

5.21

5.11

4.95

W 310 × 39

6.76

6.37

6.18

5.90

5.76

5.55

5.44

5.21

W 310 × 45

7.11

6.71

6.51

6.21

6.07

5.84

5.72

5.54