Long Span C Purlin Roof Design

For outwards loads on equal continuous spans the bridging shown is required in the end spans.

Long span c purlin roof design.

If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Monoslope pitched single. For purlins calculate 1 2 inch of depth for every foot of span. Cpe 0 9 and cpi 0 2.

Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports. Four or more equi spaced supports. For 2x4s purlins the posts are spaced in 4 feet distance. Use recommended minimum roof pitches as specified by roof sheet supplier.

The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses. 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. Data is given in each table for. Three equi spaced supports equal spans.

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. These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span. C purlin and c girt structural steel wind snow weight tables. Tables are given for 5 or more spans.

If a steel girder must span 24 feet between columns it should be at least 18 deep. Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns. The c sections can also form part of the columns and rafters in these smaller applications. Max roof span allowed 12m.

C purlins and c girts. Arrangement of purlins by default purlin sections assume the slope of the roof they are supporting. Maximum roof slope is 5 for monoslope and 22 5 for pitched roof. Two supports one at each end double span.

High pressure zones kl 1 5 and 2 0 included. The number of supports beams or purlins affects the allowable span length. Spantec has prepared these tables for use by people skilled in the design and specification of the. We manufacture any component from 1 2 steel subgirts to 12 section up to 10 gauge.

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. Safe roof purlins spans. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. This post will be focusing on design of steel purlin using cold formed sections.

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.