A-Table 9.20.5.2.-C Steel Beams Supporting Masonry Veneer.

Design Assumptions

1.

Density of Veneer:

• Brick = 18.9 kN/m3
• Limestone or Sandstone = 22.62 kN/m3

2.

Dead Load of Veneer:

• 70 mm Brick = 0.070 x 18.9 = 1.32 kPa
• 89 mm Brick = 0.089 x 18.9 = 1.68 kPa
• 100 mm Stone = 0.10 x 22.62 = 2.26 kPa

3.

Design Standards:

• CSA S304.1-94, “Masonry Design for Buildings (Limit States Design)”
• CSA S16.1-94, “Limit States Design of Steel Structures”

4.

Design Assumptions - Steel Angles in Table 9.20.5.2.-B:

• For angle sizes (150 x 90 x 10; 150 x 90 x 13; 150 x 100 x 13; 180 x 100 x 10; 180 x 100 x 13)
• Mid-span deflection limited to span/700 as per Note (6) of Table 9.20.5.2.-A in the Building Code.
• Arch action of the brick veneer is assumed, which means that all brick weight within a 45 degree angle of the edge of the opening is not considered in the design of the lintel.
• The steel yield strength is 300 MPa.

5.

Design Assumptions - Steel Wide Flange Beams in Table 9.20.5.2.-C:

• Mid-span deflection limited to span/700 as per Note (6) of Table 9.20.5.2.-A in the Building Code for the brick load only.
• Mid-span deflection limited to span/600 as per Clause 6.3.5.1 of CSA S304.1 for brick weight plus roof live load (see below).
• Arch action of the brick veneer is assumed, which means that all brick weight within a 45 degree angle of the edge of the opening is not considered in the design of the lintel.
• The beam is designed for a roof live load of 2.3 kN/m. This is to account for the fact that the steel beam will typically support a wood stud wall and a gable truss or outlook rafters as well as the brick veneer.
• The beam is considered to be laterally unsupported along its length since it does not support a floor.
• The beam is supported by steel columns at each end.
• The steel yield strength is 300 MPa.