Cpe 0 9 and cpi 0 2.
Long span c purlin roof design.
Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports.
Here is the formula for calculation of a roof purlin.
High pressure zones kl 1 5 and 2 0 included.
C purlin and c girt structural steel wind snow weight tables.
Spantec has prepared these tables for use by people skilled in the design and specification of the.
Monoslope pitched single.
Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns.
This post will be focusing on design of steel purlin using cold formed sections.
For purlins calculate 1 2 inch of depth for every foot of span.
Maximum roof slope is 5 for monoslope and 22 5 for pitched roof.
The c sections can also form part of the columns and rafters in these smaller applications.
Four or more equi spaced supports.
For outwards loads on equal continuous spans the bridging shown is required in the end spans.
The number of supports beams or purlins affects the allowable span length.
For 2x4s purlins the posts are spaced in 4 feet distance.
C purlins and c girts.
If a steel purlin must span 24 feet between girders it should be at least 12 deep for girders calculate 3 4 inch of depth for every foot of span.
Arrangement of purlins by default purlin sections assume the slope of the roof they are supporting.
Use recommended minimum roof pitches as specified by roof sheet supplier.
The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.
Three equi spaced supports equal spans.
Safe roof purlins spans.
If a steel girder must span 24 feet between columns it should be at least 18 deep.
These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span.
Data is given in each table for.
We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge.
Purlins rails eaves beams z e d p u r l i n s y s t e m s e a v e s be a m s z e d c e e s h e e t i n g r a i l s fl o o r c e e s design guide september 2014.
Tables are given for 5 or more spans.
Cos of live load dead load x cos of the purlin spacing x purlin span squared 8 x sm section modulus of the member x duration of load 1 15 in areas with snowfall x cr repetitive member factor of 1 15 where members are 24 on center or less fb fiberstress required.
If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts.
Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m.
Max roof span allowed 12m.
The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses.
