Long Span C Purlin Roof Design

This post will be focusing on design of steel purlin using cold formed sections.

Long span c purlin roof design.

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. 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. For purlins calculate 1 2 inch of depth for every foot of span. For 2x4s purlins the posts are spaced in 4 feet distance.

Monoslope pitched single. C purlins and c girts. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. 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. 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. Use recommended minimum roof pitches as specified by roof sheet supplier. These tables are for spans in which purlins are lapped over each support where the lap length is 15 of the span.

Spantec has prepared these tables for use by people skilled in the design and specification of the. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm. Maximum roof slope is 5 for monoslope and 22 5 for pitched roof. Three equi spaced supports equal spans.

Continuous purlin span are simply supported at each end and at a series of equally spaced intermediate supports. Tables are given for 5 or more spans. Data is given in each table for. Max roof span allowed 12m.

The c sections can also form part of the columns and rafters in these smaller applications. For outwards loads on equal continuous spans the bridging shown is required in the end spans. Cpe 0 9 and cpi 0 2. The spacing of purlins usually call for careful arrangement in the sense that it should follow the nodal pattern of the supporting trusses.

If a steel girder must span 24 feet between columns it should be at least 18 deep. The number of supports beams or purlins affects the allowable span length. High pressure zones kl 1 5 and 2 0 included. Safe roof purlins spans.

Two supports one at each end double span. Flexospan provides standard even profile c purlins and c girts as well as custom profiles and punching patterns. Flat roof span tables allow for a maximum roof pitch of 5º. Four or more equi spaced supports.

C purlin and c girt structural steel wind snow weight tables.