engineering references & design information for louvretec systems and support frames
ENGINEERING REFERENCES AND DESIGN INFORMATION FOR LOUVRETEC SYSTEMS AND SUPPORT FRAMES 09 2017 27 March June 2017 The following calculations and design tables are for use with LouvreTec Aluminium Louvre Systems and supporting structures. No substitution is permitted. The user of these design tables must ensure that the latest copy of the design manual is used, as calculations and tables may be amended to suit design codes and amendments applicable at the time of printing. Maximum spans for the aluminium members have been calculated using wind zones and wind speeds taken from NZS 3604:2011, which are based on AS/NZS 1170:2011. The Ultimate Limit State (ULS) wind speeds are based on a 1 in 500 year return period, and are taken as acting at the building (assuming site exposure multipliers have been applied). Serviceability Limit State (SLS) wind speeds are based on a 1 in 25 year return period. Associated pressures are calculated using AS/NZS 1170.2:2011 – Structural Design Actions Part 2: Wind Actions, and have been reduced to account for louvre frames as Importance Level 1 structures. Section capacities have been determined using AS/NZS 1664.1:1997 – Aluminium Structures, Part 1: Limit State Design. Dead load deflections for louvres and beams have been limited to span/300. Dead load deflections on louvres have also been limited to 20mm. Wind load deflections have been limited to span/40 for louvres, span/300 for beams, and height/100 for posts. Wind speeds as noted above (based on AS/NZS1170.2:2011) are as follows: Wind Zone Low Medium High Very High Extra High
ULS wind speed (m/s) 32 37 44 50 55
SLS wind speed (m/s) 26 30 37 42 46
The following load case combinations have been applied to the member loads: ULS uplift pressure 0.9G, W u ULS downthrust pressure 1.2G, W u SLS for deflection G, W s The internal and external pressure coefficients adopted conservatively apply to a number of different structure orientations and dimensions. The following limitations apply to these tables: • Louvre roof pitch must be less than 10°; • Supporting structure height to be less than 10m; Notes: 1) When the louvre structure is to be attached to an existing building, care must be taken to ensure that supporting structure has adequate strength to carry the additional loads. If there is any doubt contact LouvreTec for advice. 2) Post sizes have been calculated using loads acting on the roof of the aluminium structure only. Additional walls placed between posts will need to be self-supported, or have specifically designed posts to carry the additional wind loads.
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DATE MODIFIED : 27/06/2017 FILE: 11.04 www.louvretec.co.nz www.louvretec.com.au ©Louvretec 2017. All rights reserved. Technical details subject to change without notice.