9.20.5.2.Lintels or Arches

(1) Masonry over openings shall be supported by steel, reinforced concrete lintels or masonry arches designed to support the imposed loads. (2) Except as provided in Sentences (3) and (5), steel angle lintels supporting masonry above openings shall conform to Table 9.20.5.2.-A. (3) Steel angle lintels supporting masonry veneer above openings shall conform to Table 9.20.5.2.-B. Table 9.20.5.2.-A Loose Steel Lintels for Masonry – No. & Size of Angles Required(1)(2) Forming Part of Sentence 9.20.5.2.(2) Exterior Angles, mm Interior Angles, mm For Brick For Stone Wall Maximum Floor Loads per Metre of Span in Newtons(4)(6)(7) Clear 100 mm + 50 mm Thickness, Span(3)(5) 100 mm stone facing mm None 3 650 7 300 10 950 14 600 18 250 21 900 No Floor Load L-89 L-89 L-89 L-102 L-127 L-127 L-127 203 × 89 × 89 × 89 × 89 × 89 × 89 × 89 1.2 m or × 6.4 × 6.4 × 7.9 × 7.9 × 7.9 × 11 × 13 L-89 × 89 × 6.4 L-127 × 89 × 7.9 less 2Ls-89 2Ls-89 2Ls-89 2Ls-89 2Ls-89 2Ls-102 2Ls-102 305 × 89 × 89 × 89 × 89 × 89 × 89 × 89 × 7.9 × 7.9 × 7.9 × 7.9 × 7.9 × 7.9 × 7.9 L-89 L-89 L-127 L-127 L-127 L-152 203 × 89 × 89 × 89 × 89 × 89 × 89 × 7.9 × 7.9 × 7.9 × 11 × 13 × 11 1.5 m L-89 × 89 × 7.9 L-127 × 89 × 7.9 2Ls-89 2Ls-89 2Ls-89 2Ls-127 2Ls-127 2Ls-127 2Ls-127 305 × 89 × 89 × 89 × 89 × 89 × 89 × 89 × 7.9 × 7.9 × 7.9 × 7.9 × 7.9 × 7.9 × 11 L-102 L-127 L-127 L-152 203 × 89 × 89 × 89 × 102 × 7.9 × 7.9 × 7.9 × 11 1.8 m L-102 × 89 × 7.9 L-127 × 127 × 7.9 2Ls-102 2Ls-102 2Ls-127 2Ls-127 2Ls-127 2Ls-152 2Ls-152 305 × 89 × 89 × 89 × 89 × 89 × 102 × 102 × 7.9 × 7.9 × 7.9 × 7.9 × 11 × 11 × 11 L-102 L-127 L-152 203 × 89 × 89 × 102 × 7.9 × 11 × 11 2.1 m L-102 × 89 × 7.9 L-127 × 127 × 7.9 2Ls-102 2Ls-127 2Ls-127 2Ls-152 2Ls-152 305 × 89 × 89 × 89 × 102 × 102 × 7.9 × 11 × 11 × 11 × 11 L-127 L-152 203 × 89 × 102 × 7.9 × 11 2.4 m L-127 × 89 × 7.9 L-127 × 127 × 7.9 2Ls-127 2Ls-127 2Ls-152 305 × 89 × 89 × 102 × 7.9 × 13 × 11 L-127 203 × 89 × 11 2.7 m L-127 × 89 × 11 L-127 × 127 × 11 2Ls-127 2Ls-152 305 × 152 × 102 × 11 × 11 L-152 203 × 102 × 11 3.0 m L-152 × 102 × 11 L-127 × 127 × 13 2Ls-152 305 × 102 × 11 Notes to Table 9.20.5.2.-A: (1) The figures in the Table indicating wall thickness and angle cross-section are in mm. (2) fs = 138 MPa., Deflection maximum = 1/700 span. (3) See Sentence 9.20.5.2.(3.1). (4) Omit floor load in lintel when distance to bottom of floor construction is greater than width of opening. (5) Interior and exterior angles in 200 mm walls and interior angles in 300 mm walls are bolted together when clear span is over 1 800 mm. (6) When masonry lighter than brick is used over interior angles floor load may be increased by the difference in weight per square metre times the width of the opening. Not generally available. (7) Interior angles have been designed for floor load plus brick masonry of height equal to width of opening. Table 9.20.5.2.-B Maximum Allowable Spans for Steel Lintels Supporting Masonry Veneer, m Forming Part of Sentence 9.20.5.2.(3) Minimum Angle Size, mm Maximum Allowable Spans, m Vertical Leg Horizontal Leg Thickness 70 mm Brick 90 mm Brick 100 mm Stone 89 76 6.4 2.55 — — 89 89 6.4 2.59 2.47 2.30 102 89 6.4 2.79 2.66 2.48 127 89 7.9 3.47 3.31 3.08 127 89 11 3.64 3.48 3.24 127 89 13 3.82 3.59 3.33 152 89 11 4.06 3.82 3.54 152 89 13 4.32 4.07 3.77 152 102 13 4.37 4.12 3.82 178 102 11 4.57 4.30 3.99 178 102 13 4.87 4.59 4.25 (3.1) Steel lintels described in Sentences (2) and (3) shall (a) have even and level bearing and shall have not less than 150 mm length of bearing at end supports, and (b) bear on masonry, concrete or steel. (4) Steel angle lintels supporting masonry shall be prime painted or otherwise protected from corrosion. (5) Steel beams supporting masonry veneer and wood stud walls above openings shall conform to Table 9.20.5.2.-C. (6) Steel beams described in Sentence (5) shall be supported at each end by a steel column, and have a minimum 6 mm plate welded to the flange to support the masonry veneer. Table 9.20.5.2.-C Maximum Allowable Spans for Steel Beams Supporting Masonry Veneer, m (1)(2)(3) Forming Part of Sentence 9.20.5.2.(5) Section 70 mm Brick 90 mm Brick 100 mm Stone W150 × 22 4.23 4.09 3.92 W150 × 30 4.68 4.52 4.32 W200 × 27 5.26 5.08 4.84 W200 × 31 5.57 5.37 5.11 W200 × 36 5.70 5.49 5.23 Notes to Table 9.20.5.2.-C: (1) These spans assume that the beam supports the veneer, a wood stud wall and a maximum specified roof live load of 2.3 kN/m. (2) Where the steel beam carries floor loads or larger roof loads, refer to Article 9.23.4.3. (3) See Note A-Table 9.20.5.2.-C.