OZM WALL Design Guidelines.pdf · concrete shear walls in accordance with the definitions within AS1170.4 (2007), and should be assessed and

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OZM WALL ENGINEERING DESIGN GUIDELINES Version C1 Issued 05.09.2011 IMPORTANT NOTICE THE INFORMATION CONTAINED IN THIS DOCUMENT IS INTENDED FOR THE USE OF SUITABLY QUALIFIED AND EXPERIENCED STRUCTURAL ENGINEERS AND BUILDING PROFESSIONALS. THIS INFORMATION IS NOT INTENDED TO REPLACE DESIGN CALCULATIONS OR ANALYSIS NORMALLY ASSOCIATED WITH THE DESIGN AND SPECIFICATION OF BUILDINGS AND THEIR COMPONENTS. ROBERT BIRD GROUP AND OZWALL PTY LTD ACCEPT NO LIABILITY FOR ANY CIRCUMSTANCES ARISING FROM THE FAILURE OF A SPECIFIER TO ADHERE TO THE REQUIREMENTS OF THE APPROPRIATE STANDARDS AND CODES OF PRACTICE, AND BUILDING CODES. A QUALIFIED PROFESSIONAL STRUCTURAL ENGINEER IS REQUIRED TO CERTIFY THE PROJECT-SPECIFIC APPLICATION OF THESE DESIGN GUIDELINES AS THEY APPLY TO THE USE OF OZM WALL PANELS AS A LOAD-BEARING STRUCTURAL ELEMENT.

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CONTENTS

1.0 HOW TO USE THESE GUIDELINES Page 3 2.0 INTRODUCTION TO OZM WALL Page 4 2.1 What are OZM Wall panels? Page 4 2.2 Product Dimensions Page 4 2.3 Concrete Filling of OZM Wall panels Page 4 2.4 Reinforcing OZM Wall panels Page 5 2.5 OZM Walls subjected to Earthquake Loads Page 5 2.5 Fire Resistance Period of OZM Walls Page 5

3.0 STRUCTURAL CAPACITY CHARTS Page 6 3.1 OZM168

Axial Load Capacity Page 6 Flexural Capacity Page 8 In-plane Shear Capacity Page 8

3.2 OZM200 Axial Load Capacity Page 9

Flexural Capacity Page 11 In-plane Shear Capacity Page 11

3.3 OZM218 Axial Load Capacity Page 12

Flexural Capacity Page 14 In-plane Shear Capacity Page 14

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1.0 HOW TO USE THESE GUIDELINES The “OZM Wall Engineering Design Guidelines” addresses the approach to structural capacity for the OZM Wall system, when the system is used as lost formwork. The guidelines are not intended as a stand alone code of practice and should be read and interpreted in conjunction with the relevant Australian Standards and Building codes including but not limited to: • AS 1170.0 – 2002 Wind Loads • AS 3600 – 2009 Concrete Structures • BCA 2011 Building Code of Australia Limitations

Application of these guidelines is limited to –

- walls constructed in accordance with the requirements of AS3600 and AS3610

- vertical walls restrained top and bottom (not cantilevered)

- structural capacities of the completed wall as a load-bearing concrete wall element

This guide does not address the performance of OZM Wall panels as a formwork system during construction.

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2.0 INTRODUCTION TO OZM WALL 2.1 What are OZM Wall panels?

OZM Wall panels are a lost formwork system, that can be reinforced and concrete-filled to create a load-bearing reinforced concrete wall system that can meet the requirements of Australian Standards and the Building Code of Australia. When used as a lost formwork system only, OZM Wall panels effectively create a reinforced concrete wall that can be designed – with limitations as described below – as a wall to AS3600. OZM panels are made from a composite fibre cement board with a high strength-to-weight ratio. There are no metal components in an OZM panel.

2.2 Product Dimensions

OZM Wall panels are manufactured to the dimensions shown below.

Currently the maximum sheet size is 3000mm long. Contact Ozwall at www.ozwall.com.au for information on the supply of longer panels.

2.3 Concrete Filling of OZM panels

OZM Wall panels can be filled with concrete in a similar manner to conventionally formed reinforced concrete walls. Placement of concrete should occur consistent with the requirements of AS3600 and AS3610, and the project structural engineer should issue project-specific specifications for the placement of concrete into OZM Wall panels on this basis. It is recommended that for OZM168 panels, a mix design adopting a maximum aggregate size of 10mm should be considered, to assist in achieving a high quality of compaction and ease of filling.

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2.4 Reinforcing OZM Wall panels

Both horizontal and vertical reinforcement can be provided in OZM Wall panels, similar to a conventionally-formed reinforced concrete wall detailed in accordance with AS3600. Typically reinforcement spacing should be specified at multiples of 300mm both vertically and horizontally, to coordinate with the dimensional set-out of the vertical web openings within the OZM Wall panel. Horizontal Reinforcement for Restraint/Shrinkage Cracking OZM Walls with control joints at maximum 8 metre centres can be considered unrestrained for the purposes of crack control reinforcement design. Crack control performance equivalent to providing minimum reinforcement to AS3600 Clause 11.7.1 is provided by the OZM Wall lost formwork shell, and hence horizontal reinforcement is not required for crack control if the wall is unrestrained. If walls are considered restrained by the definitions of AS3600, then horizontal reinforcement in accordance with AS3600 Clause 11.7.2 should be provided by the design engineer.

2.5 OZM Walls Subjected to Earthquake Loads

Without reinforcement, OZM Walls should be considered as unreinforced concrete, or masonry elements, and should be assessed and detailed as a part of the overall structural load-resisting system in accordance with AS1170.4 (2007). Generally, this will mean that unreinforced OZM Walls should not be utilised in structures with an effective height of greater than 15 metres. If reinforced horizontally and vertically, OZM Walls can be considered as limited ductile reinforced concrete shear walls in accordance with the definitions within AS1170.4 (2007), and should be assessed and detailed appropriately as a part of the overall structural load-resisting system.

2.6 Fire Resistance Period of OZM Walls

The fire resistance period of OZM Walls can be calculated in accordance with AS3600 Section 5.7. When considering minimum effective thickness of walls, the full thickness of the OZM wall section can be considered.

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3.0 STRUCTURAL CAPACITY CHARTS The following charts present structural design capacities for each Ozwall OZM Wall series, being –

- OZM168

- OZM200

- OZM218 The following structural capacities are provided in this guide –

- AXIAL LOAD CAPACITY Load capacities are presented based on standard eccentricities for continuous or discontinuous floors, with wall capacities presented for various effective heights of walls in accordance with AS3600 Section 11.

- FLEXURAL CAPACITY If the wall is subject to significant axial compression force, i.e greater than 0.03 fc’ or 2.0 MPa, the engineer should –

- Determine the maximum moment on the wall from the horizontal load - Convert the moment to an additional equivalent vertical load eccentricity - Determine the reduced axial capacity of the wall under the additional vertical load eccentricity

If there are no significant vertical loads applied to the wall, a maximum ultimate uniformly distributed horizontal load can be applied in accordance with the values given in the tables.

- IN-PLANE HORIZONTAL SHEAR CAPACITY In-plane horizontal shear capacities are calculated in accordance with AS3600, and are presented based on a minimum amount of reinforcement to be provided in both horizontal and vertical directions. Capacities are only provided for walls where Hw/Lw is less than 1.0. Control joints in walls should be carefully considered in the design, as these create in-plane shear discontinuity in the walls, which needs to be considered when assessing the ration of Hw/Lw in accordance with AS3600.

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3.1 OZM168

AXIAL COMPRESSION CAPACITY

Values below are the maximum ultimate compression capacity, in kN/m

H.wu (mm) 25 32 40 25 32 40

4500 622 796 995 427 546 683

4200 691 885 1106 496 635 793

3900 756 967 1209 560 717 896

3600 815 1043 1304 620 793 992

3300 870 1114 1392 675 864 1080

3000 920 1178 1472 725 928 1160

2700 965 1236 1545 770 986 1232

2400 1006 1288 1609 811 1038 1297

2100 1042 1333 1667 846 1083 1354

1800 1073 1373 1716 877 1123 1404

OZM 168

f'c (Mpa)

Continuous Floor e=0.050t.wK = 1.00

Discontinuous Floor e=0.167t.w

f'c (Mpa)

NOTE: Provide N12-900 vertical starter bars 800mm long overall, placed central in the wall

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3.1 OZM168



H.wu (mm) 25 32 40 25 32 40

4500 857 1097 1371 661 847 1058

4200 896 1146 1433 700 896 1121

3900 932 1193 1491 737 943 1178

3600 965 1236 1545 770 986 1232

3300 996 1275 1594 801 1025 1281

3000 1024 1311 1639 829 1061 1327

2700 1050 1344 1680 855 1094 1367

2400 1073 1373 1716 877 1123 1404

2100 1093 1399 1748 898 1149 1436

1800 1110 1421 1776 915 1171 1464

OZM 168

K = 0.75Continuous Floor e=0.050t.w Discontinuous Floor e=0.167t.w

f'c (Mpa) f'c (Mpa)

NOTE: To achieve fixity, provide N12-600 vertical starter bars 1000mm long overall, placed central in the wall

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3.1 OZM168

FLEXURAL CAPACITY Values below are the maximum ultimate uniformly distributed horizontal load, in kPa. Vertical reinforcement as noted in the table is continuous vertical reinforcement placed centrally, and should be lapped as required in accordance with AS3600.

H.wu (mm) 900 600 300

4500 1.30 1.96 3.91

4200 1.50 2.24 4.49

3900 1.74 2.60 5.21

3600 2.04 3.06 6.11

3300 2.42 3.64 7.27

3000 2.93 4.40 8.80

2700 3.62 5.43 10.86

2400 4.58 6.88 13.75

2100 5.99 8.98 17.96

1800 8.15 12.22 24.44

168N12 Vertical reinforcement spacing (mm)

OZM

IN-PLANE HORIZONTAL SHEAR CAPACITY Values below are the maximum ultimate horizontal in-plane shear capacity in kN/m length of wall. Reinforcement as noted in the table is continuous reinforcement placed centrally, and should be lapped as required in accordance with AS3600.

25 32 40

N12-900 49 52 54

N12-600 65 67 70

N12-300 111 113 116

N16-300 186 188 191

N20-300 277 280 282

168Hw/Lw < 1.0 (ultimate in-plane shear capacity in kN/m)

f'c (Mpa)

OZM

Lesser of horz reo

and vert reo

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3.2 OZM200



H.wu (mm) 25 32 40 25 32 40

4500 965 1236 1545 733 938 1173

4200 1022 1309 1636 790 1011 1264

3900 1075 1377 1721 843 1079 1349

3600 1125 1439 1799 892 1142 1427

3300 1170 1497 1872 937 1200 1500

3000 1211 1550 1938 979 1253 1566

2700 1248 1598 1997 1016 1300 1625

2400 1282 1641 2051 1049 1343 1679

2100 1311 1678 2098 1079 1381 1726

1800 1337 1711 2139 1104 1414 1767


f'c (Mpa) f'c (Mpa)

OZM 200


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3.2 OZM200



H.wu (mm) 25 32 40 25 32 40

4500 1159 1483 1854 926 1186 1482

4200 1191 1524 1905 958 1227 1533

3900 1221 1563 1953 988 1265 1581

3600 1248 1598 1997 1016 1300 1625

3300 1274 1631 2038 1041 1333 1666

3000 1297 1660 2075 1065 1363 1703

2700 1318 1687 2109 1086 1390 1737

2400 1337 1711 2139 1104 1414 1767

2100 1353 1732 2165 1121 1435 1793

1800 1368 1751 2188 1135 1453 1816

f'c (Mpa) f'c (Mpa)

OZM 200



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3.2 OZM200


H.wu (mm) 900 600 300

4500 1.58 2.37 4.75

4200 1.82 2.72 5.45

3900 2.11 3.16 6.32

3600 2.47 3.71 7.41

3300 2.94 4.41 8.82

3000 3.56 5.34 10.68

2700 4.39 6.59 13.18

2400 5.56 8.34 16.68

2100 7.26 10.90 21.79

1800 9.89 14.83 29.66

OZM 200N12 Vertical reinforcement spacing (mm)


25 32 40

N12-900 54 57 60

N12-600 70 73 76

N12-300 116 119 122

N16-300 193 196 199

N20-300 286 289 292

OZM 200

Lesser of horz reo

and vert reo

Hw/Lw < 1.0 (ultimate in-plane shear capacity in kN/m)

f'c (Mpa)

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3.3 OZM218



H.wu (mm) 25 32 40 25 32 40

4500 1145 1466 1832 892 1142 1427

4200 1197 1532 1915 944 1208 1510

3900 1245 1594 1993 992 1270 1587

3600 1290 1651 2064 1037 1327 1659

3300 1331 1704 2130 1078 1380 1725

3000 1369 1752 2190 1115 1428 1785

2700 1403 1796 2245 1149 1471 1839

2400 1433 1835 2293 1180 1510 1888

2100 1460 1869 2336 1207 1544 1931

1800 1483 1899 2373 1230 1574 1968


f'c (Mpa) f'c (Mpa)

OZM 218


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3.3 OZM218



H.wu (mm) 25 32 40 25 32 40

4500 1321 1691 2114 1068 1367 1709

4200 1351 1729 2161 1097 1404 1755

3900 1378 1763 2204 1124 1439 1799

3600 1403 1796 2245 1149 1471 1839

3300 1426 1825 2282 1173 1501 1876

3000 1447 1852 2315 1194 1528 1910

2700 1466 1877 2346 1213 1552 1940

2400 1483 1899 2373 1230 1574 1968

2100 1498 1918 2397 1245 1594 1992

1800 1511 1935 2418 1258 1610 2013


f'c (Mpa) f'c (Mpa)

OZM 218


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3.3 OZM200


H.wu (mm) 900 600 300

4500 1.74 2.61 5.21

4200 2.00 2.99 5.99

3900 2.31 3.47 6.94

3600 2.72 4.07 8.15

3300 3.23 4.85 9.70

3000 3.91 5.87 11.73

2700 4.83 7.24 14.49

2400 6.11 9.17 18.33

2100 7.98 11.97 23.95

1800 10.86 16.30 32.59

OZM 218N12 Vertical reinforcement spacing (mm)


25 32 40

N12-900 57 60 63

N12-600 72 76 79

N12-300 119 123 126

N16-300 196 200 203

N20-300 291 294 297

OZM 218

Lesser of horz reo

and vert reo

Hw/Lw < 1.0 (ultimate in-plane shear capacity in kN/m)

f'c (Mpa)

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www.ozwall.com.au

Documents

OZM WALL Design Guidelines.pdf · concrete shear walls in accordance with the definitions within AS1170.4 (2007), and should be assessed and