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Architecture fit for a king and queen…
To be honest, we didn’t know the project was a castle. Our contribution was to provide all the steel joists and metal decking to achieve what the builder, Iwanski Pyzi Masonry, wanted – then sync with construction and stage the project precisely. Having previously designed schools in the area that happen to stand in what is locally called tornado alley, the builder’s vision was to combine remarkable structural endurance and unique design.
It wasn’t until the project was put on the market and the local trade press in the Chicago area started buzzing, that we learned it was a residence. Listed with Coldwell Banker at $5.7M as of this writing, the residence seems like a vision out of Camelot, though without the usual moat or damsels in distress.
If you are in the market, check out the web site that was built to sell The Castle: http://www.kingwanted.com
How to calculate rolled chords…
In the process of developing our latest expanded specifications catalog for special profile joist designs, we recently addressed several engineering problems that have long been neglected in the realm of published technical documents pertaining to steel joist design. One of these issues is in regard to rolled chords.
At the core of any structural analysis package is a stiffness matrix created in the modeling of the structure (e.g. truss, joist, girder, etc.) The matrix mathematically represents the stiffness properties of the structure being analyzed. All of the
node-to-node forces occur along a straight-line, or node-to-node, distance.
Joists with rolled chords are therefore analyzed as joists with multi-pitched chords, where the web-to-chord location is correct but between the chord nodes there is a divergence of the linear element (usually a pair of angles). The forces created by this condition may be visualized by imagining the forces that exist in an archer’s bow. The compression in the bow is balanced by the tension in the string, but within the bow there is a secondary bending stress that occurs due to the divergence of the member from the line of force in the string.
A similar condition exists between every panel point of a truss with rolled chords members. In the New Millennium Standard Specification, SP-Series, this stress condition was given the term “divergence stress” and added as a component to be included in the design of rolled chord elements.
For more information on this subject, download our article:
Raising Expectations: New Design Freedom for Architects and Engineers (176 KB pdf)
3-week turn-around claim is put to the test...
In our last edition of Roof-Lines we made the observation here that our flexible manufacturing model enabled us to turn around a project in three weeks. As though to retest this assertion, another one of you challenged us to again do just that.
Here is a quote from Brian Oshea, Project Manager, Ohio Steel Fab:
“I would like to take the time to thank you for your outstanding service provided to Ohio Steel Fabrication on a recent fast-track project, K & M Tire, in Delphos, Ohio. From the time I said “go”, you were able to detail, coordinate with my structural detailer, get out for approval, back from approval, update drawings, fabricate, and deliver to site in less than three weeks. Not only did New Millennium turn this job around in less than three weeks, I did not have a single call from the field. This was a first time job with this customer, and with New Millennium’s help, we blew him away with quality and service.”
For more information about the competitive business advantages we can offer your firm, download our report:
Steel Joist and Deck Design, Manufacturing and Delivery (804 KB pdf)
New Millennium steel joists and metal decking achieved the structural integrity sought by the builder.
The forces created along a bow joist using rolled chords may be visualized by imagining the forces that exist in an archer’s bow.
When necessary to your business, our dynamic manufacturing model can enable the delivery of steel joists in 3 weeks or less.
New Millennium Building Systems is a wholly owned subsidiary of Steel Dynamics Inc.
