New Millennium Building Systems
Steel Joist Institute, ANSI, Steel Deck Institute Steel Joist Institute ANSI Steel Deck Institute

Design Ideas

New design-build course for better steel joist and deck design

Design-Build Course AIA/PDH credit hour

This new 1.0 AIA LU and PDH credit hour course shows you how the design-build approach can reduce a range of project costs related to steel joist, steel deck and beam design, while uplifting the overall performance of the finished building from an owner's point of view.

The course is to assist all structural steel design design professionals, including architects, engineers and their owner-developers with a specific understanding of the following:

 

  • Why the design-build approach fosters improvements in steel joist and metal decking design
  • The range of overt and covert costs related to steel joist, steel deck and beam integration
  • Engineering for total-project cost control from reduced steel tonnage to a related chain reaction of often overlooked project costs.
  • Range of steel construction materials and methods, including special profile steel joists, tension-controlled steel joist design, castellated and cellular steel beams, and related building-information modeling (BIM) process management.

 

Take this AIA/PDH course now.

 

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Application Notes

Cut costs with steel joist moment framing

Axial Load Tie Examples

Figure 1: Axial Load Tie Examples

As shown in these examples, the most cost effective way to design for induced axial loads is to provide a direct load path from the chords to the support or to another reinforcing member.

Using steel joists and joist girders as part of a rigid moment frame will often be more cost effective than wide flange beams, braced frames, or shear walls.

The axial loads caused by a rigid moment frame will develop secondary moments (M=+/- P x Ecc.) in the joist chords, especially when the load path is through the joists seats and column connection.

 

Steel joist and joist girder chords have a comparably low moment capacity. As these eccentric loads increase, so does the need for increased chord sections and/or expensive chord reinforcement. The most cost effective way to design for these induced axial loads is to provide a direct load path from the chords to the support or to another reinforcing member. The alternate load path will diminish or eliminate the eccentric moment in the joist or joist girder chord.

 

The design of this path should be left to the specifying engineer. The engineer will thereby have more control over the design of the tying mechanism between the chords and/or support. This approach will require less coordination with the steel joist manufacturer and will result in the most economical steel joist or joist girder.

 

Some example connections are indicated in Figure 1. Also, visit www.steeljoist.org/design_tools to download moment connection design tools provided free by the Steel Joist Institute.

 

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Did You Know?

Study reveals the greater value of BIM
BIM steel joist design adoption

A recent McGraw-Hill Construction study found that industry-wide adoption of building information modeling (BIM) or BIM related tools in the United States grew from 28% in 2007 to 71% in 2012.

Moreover, the study also disclosed a clear trend regarding the frequency and perceived value of model sharing processes, specifically in regard to design collaboration at the trade level, including steel joist and deck supply.

 

The study found that the frequency of model sharing between architects, engineers and contractors was more than two times higher than the frequency of model sharing between these participants and trade contractors such as steel joist, deck and beam suppliers: Yet the use of BIM at the trade level was the only area where the perceived value of BIM exceeded the frequency of its use.

 

On this point, the study found widespread agreement across BIM users and non-users that BIM would be the most valuable were it used in support of collaboration at the trade level, including steel joist, deck and beam design.

 

Benefits of BIM use at the trade (steel joist and deck) supply level include:

  • Reduced number and need for information requests
  • Improved communication between all parties
  • Improved accuracy of construction documents
  • Reduced field coordination problems
  • Shorter time drafting and more time designing
  • Reduced construction costs

 

* McGraw-Hill Construction Study

SmartMarketReport: The Business Value of BIM in North America, 2012

Free download (pdf)

Dynamic Joist® BIM Component

Since early 2010, New Millennium's industry-leading Dynamic Joist® BIM component has enhanced BIM steel joist design collaboration in real-world projects throughout the US.

Free component download

Dynamic Joist® BIM Brochure

Brochure reviews BIM-based steel joist and deck design: “4D” improved project scheduling, "5D" improved estimating and cost/value decision management, and "6D" lifetime owner-operational management.

Free download (pdf)

 

Steel Dynamics, Inc

New Millennium Building Systems is a wholly owned subsidiary of Steel Dynamics Inc.