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:
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.
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:
* McGraw-Hill Construction Study
SmartMarketReport: The Business Value of BIM in North America, 2012
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.
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.