PURLINS & GIRTS

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BRACE CHANNEL CAPACITY Where braces are subject to additional loads such as the support of reticulation systems, engineers should calculate axial and bending loads on the braces and then check the member for the combined axial bending and compression in accordance with the formula given on page 4 of the brochure and the following tables. Brace channel subjected to additional loads should have bolted connections to purlins. SECTIONAL PROPERTIES AREA WEIGHT SECOND MOMENT OF AREA (GROSS SECTION) SECTION MODULUS RADIUS OF GYRATION TORSION CONSTANT WARPING FACTOR A s W t I x I y Z x Z y r x r x J I w DESIGNATION mm 2 kN/m 10 6 mm 4 10 6 mm 4 10 3 mm 3 10 3 mm 3 mm mm mm 4 10 9 mm 6 100x32x0.95 169 0.0133 0.249 0.0238 5.03 1.07 38.4 11.9 50.9 0.0499 100x32x1.15 204 0.016 0.298 0.0282 6.04 1.28 38.2 11.8 89.8 0.0588 Note: All section properties are for the gross section. SECTIONAL CAPACITIES BENDING SECTION MOMENT CAPACITY DISTORTIONAL BUCKLING MOMENT CAPACITY FLEXI-TORSIONAL BUCKLING MOMENT CAPACITY (KN.M) φ b M fb x EFFECTIVE LENGTH (LE) IN METRES φ b M sx φ b M dbx DESIGNATION (kN.m) (kN.m) 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 100x32x0.95 1.18 1.11 1.05 0.941 0.814 0.667 0.522 0.42 0.348 0.293 0.252 100x32x1.15 1.42 1.34 1.25 1.13 0.977 0.809 0.638 0.517 0.431 0.366 0.316 SECTIONAL CAPACITIES SHEAR AND AXIAL COMPRESSION SHEAR CAPACITY AXIAL COMPRESSION SECTION CAPACITY AXIAL COMPRESSION MEMBER CAPACITY (KN) φ c N c EFFECTIVE LENGTH (LE) IN METRES φ v V v φ c N s DESIGNATION (kN.m) (kN.m) 1 1.25 1. 5 1.75 2 2.25 2.5 2.75 3 100x32x0.95 8.1 26.4 19.2 16 12.9 10.1 8.05 6.6 5.51 4.63 3.89 100x32x1.15 12.4 33.7 24.4 20.4 16.4 12.8 10.1 8.18 6.63 5.47 4.6 SECTIONAL CAPACITIES ELASTIC BUCKLING AXIAL COMPRESSION MEMBER CAPACITY (KN) N e EFFECTIVE LENGTH (LE) IN METRES DESIGNATION 1 1.25 1. 5 1.75 2 2.25 2.5 2.75 3 100x32x0.95 492 315 219 161 123 97.2 78.7 65. 1 54.7 100x32x1.15 589 377 262 192 147 116 94.2 77.9 65.4 BRACE CHANNEL DIMENSIONS 32 100 t = 0.95 t = 1.15 r = 3 12 24 <strong>PURLINS</strong> & <strong>GIRTS</strong> DESIGN GUIDE
DETAILING AND INSTALLATION ORDERING Orders may be placed at any Steel & Tube sales office on the standard form. Purlin size and length must be specified, along with hole size and placement. Holes are in pairs, symmetrical about the longitudinal axis in the web, or centerline of the flange. Delivery destination should be specified as it is the customer’s responsibility to have unloading facilities available at time of delivery. SECTION GEOMETRY PROFILE I PROFILE II PROFILE III b b b x S x L p d d 1 x S b 1 x L d 3 q p d d 3 d 1 x S d 2 x L b 1 d 4 q p d PURLIN DIMENSIONS PROFILE PURLIN SIZE HST d MM b MM t MM p MM q MM b 1 MM I 100/12 102 51 1.15 15 16.8 24.9 253 2.03 100/15 102 51 1.45 15 16.6 24.7 316 2.54 100/19 102 51 1.85 15 16.4 24.4 400 3.23 II 150/12 152 65 1.15 24 10 8 59 7 23.5 33.3 386 3.03 150/15 152 65 1.45 24 10 8 59 7 23.2 32.9 483 3.79 150/18 152 65 1.75 24 10 8 59 7 23 32.6 578 4.56 III 200/12 203 75 1.15 25 12 8 59 10 10 48 25.1 35.2 478 3.80 200/15 203 75 1.45 25 12 8 59 10 10 48 24.9 35.1 598 4.76 200/18 203 75 1.75 25 12 8 59 10 10 48 24.6 34.9 717 5.72 250/13 250 85 1.25 33 12 10 59 14 25 73 28.7 37.8 625 5.01 250/15 250 85 1.45 33 12 10 59 14 25 73 28.6 37.7 722 5.79 250/18 250 85 1.75 33 12 10 59 14 25 73 28.3 37.6 866 6.96 300/15 300 100 1.45 38 12 10 59 64 25 123 32.1 45.3 847 6.72 300/18 300 100 1.75 38 12 10 59 64 25 123 31.9 45.1 1018 8.08 300/24 300 100 2.4 38 12 10 59 64 25 123 31.4 44.8 1382 11.01 300/30 300 100 3 38 12 10 59 64 25 123 30.9 44.5 1711 13.71 350/18 350 100 1.75 43 12 10 70 92 25 151 30.4 45.1 1123 8.96 350/24 350 100 2.4 43 12 10 70 92 25 151 29.9 44.8 1526 12.08 350/30 350 100 3 43 12 10 70 92 25 151 29.5 44.5 1891 15.05 400/20 400 100 1.95 48 12 10 75 132 25 191 29.1 45 1365 10.78 400/24 400 100 2.4 48 12 10 75 132 25 191 28.8 44.8 1670 13.23 400/30 400 100 3 48 12 10 75 132 25 191 28.3 44.4 2071 16.48 Notes: 1. All section properties are for the gross section. 2. x L = Centroid x s = Shear Centre. d 1 MM d 2 MM d 3 MM d 4 MM x L MM x s MM AREA A s MM 2 MASS KG/M 25
Page 1 and 2: DESIGN GUIDE PURLINS & GIRTS ROOFIN
Page 3 and 4: GENERAL INFORMATION INTRODUCTION HS
Page 5 and 6: IDENTIFICATION OF SPAN TYPE SINGLE
Page 7 and 8: ULTIMATE UNIFORMLY DISTRIBUTED LOAD
Page 15 and 16: ULTIMATE AXIAL LOAD - CONCENTRIC HS
Page 17 and 18: SPLICE JOINTS SPLICE DESIGN HST 150
Page 19 and 20: SECTIONAL PROPERTIES PURLIN SIZE AR
Page 21 and 22: WORKED EXAMPLES (CONTINUED) EXAMPLE
Page 23: WORKED EXAMPLES (CONTINUED) EXAMPLE
Page 27 and 28: BRACING SPEED CHANNEL Speed Channel
Page 29 and 30: STANDARD CLEAT DETAILS HST 100 280
Page 31 and 32: FLOOR JOIST SPAN TABLE HST SINGLE S

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