The new AS/NZS 2327:2017 Composite Structures – Composite steel-concrete construction in buildings Standard is a significant revision of AS 2327.1:2003 Composite Structures Part 1 – Simply Supported Beams. Its introduction is accompanied by Liberty OneSteel’s new free software, CompPanel, and a new discussion board.
The latest version of Australian Standard AS/NZS 2327:2017 Composite Structures – Composite steel-concrete construction in buildings was released late in December 2017 and represents a significant revision of AS 2327.1:2003 Composite Structures Part 1 – Simply Supported Beams.
The scope of the new Standard has been broadened from that of the previous Standard, which relates only to simply supported beams. This extended scope provides engineers with guidance in areas where previously they had to do their own research and assessment of what is most appropriate for their designs.
The extended scope now includes design provisions for:
- Composite slabs
- Continuous composite beams
- Composite columns
- Composite joints
- System behaviour of composite floors including floor vibrations
- Fire loading
- Web penetrations in beams
In developing the revised Standard, the Standards Australia committee considered the latest research and international Standards. Designers will be able to use with confidence the new Standard’s state-of-the-art design provisions that integrate with the suite of Australian steel and concrete design Standards.
An important example is that the phi-factors have been calibrated to be consistent with the suite of Australian Standards. The new Standard specifically addresses materials available in the Australian market including high-strength concretes of up to 100 MPa and high-strength steels up to 690 MPa. The availability of trapezoidal decks (open trough) in Australia is recognised with provisions now included in the composite slab and beam designs that cover these.
The new Standard also includes minor changes to the design of simply supported beams. The methodology is unchanged from the previous AS 2327.1:2003 Standard and the resulting designs should be similar. One area that has changed relates to shear studs. The introduction of trapezoidal decks requires the introduction of modification factors for the capacity of shear studs. The impact of this, however, is relatively minor on the re-entrant decks available in the Australian market. What does impact on the stud numbers of simply supported beams is a new provision that requires a progressively higher minimum degree of shear connection as the beam gets longer from 12m onwards.
New CompPanel software and discussion board
Liberty OneSteel is represented on the Standards Australia committee that produced the new Standard. A new version of the CompPanel software has been developed by Liberty OneSteel that implements the new provisions for simply supported beams. It’s available for download free of charge here.
Liberty OneSteel engineers have also revised Design Note DN3 – Span Tables for Simply Supported Composite Beams so that it is consistent with the new provision of AS/NZS 2327:2017. This design note is available for download here.
CompPanel Community, an online discussion board for CompPanel users to share information about solutions and ideas they have or ways they have addressed issues or problems with the software, has been launched. Not restricted exclusively to CompPanel or composite design only, included on the board are topic forums relating to other issues both on composite design and pure steel design.
Liberty OneSteel welcomes new members to the CompPanel Community and encourages their comments on all steel-design-related issues.