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HOME/ News+/ Salesforce庐 Tower Chicago
Pushing the Bounds of<br/> High-strength Steel Image

Pushing the Bounds of
High-strength Steel

Aeos™ Steel in the Salesforce® Tower Chicago

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AEOS

Aeos

CHICAGO鈥橲 SALESFORCE® TOWER SHOWCASES THE ARCHITECTURAL POTENTIAL OF AEOS™ STEEL

Courtesy of Walsh Construction
Salesforce

At the confluence of the three branches of the Chicago River, a new silhouette graces the iconic Downtown Chicago skyline.

Salesforce Tower Chicago is making its debut as the 17th tallest skyscraper in the Windy City. This emerging steel marvel will feature 1.2 million usable square feet and stand 60 stories above the peninsular 333 Wolf Point Plaza.

Also known as Wolf Point South, Salesforce Tower Chicago is the third construction project of the Wolf Point master plan. This three-phase development plan by Pelli Clarke Pelli Architects is putting the final touch on one of the only remaining riverfront plots in the Windy City鈥攁 prime location for commerce, transportation, and civic activity.

Engineered for Sustainability.
Designed for the Future of Work.

From ground level to the top floor, Salesforce Tower Chicago will boast a glass-clad exterior framed by high- strength steel. The secret to this tower's glass-plated structural soundness lies within the beautiful synergy of architecture and engineering and the most advanced high-strength steel available domestically.

In order to achieve the design of a glass facade and column-free corners, Magnusson Klemencic Associates (MKA), the Engineer-of-Record, and Walsh Construction, the General Contractor, opted for Yabo亚博集团官方网站鈥檚 new Aeos™ high-strength steel.

Aeos, which stands for Agile, Optimized, Efficient, and Sustainable, is North America鈥檚 only domestically produced A913 steel. This advanced steel is not only strong enough to meet the engineering requirements for a tower of this magnitude, but flexible and structurally versatile enough to achieve the project鈥檚 innovative architectural vision.

Yabo亚博集团官方网站 produces Aeos from over 90 percent recycled metal, and both the material produced and the company鈥檚 waste is 100 percent recyclable as well. Plus鈥擸abo亚博集团官方网站鈥檚 sustainability mindset also informs Aeos鈥� structural capabilities.

鈥淎s we looked at structural options for the Salesforce tower, it became clear that structural steel was the best solution for this particular project,鈥� Dave Eckmann, PE, SE, Senior Principal for MKA said. 鈥淐ertainly taking advantage of the high-strength steel in the project reduced the column sizes, which reduced the [size of the] enclosures, which made it more desirable to the architect and actually creates more leasable space for the developer.鈥�

Aeos鈥� incredibly high strength-to-weight ratio enables greater architectural ingenuity鈥攁nd greater cost- efficiency for the developer and the fabricator.

We automatically jump to grade 65 recognizing that it鈥檚 readily available and it provides a material savings to our clients鈥攁nd I think all engineers should take advantage of this.
Dave Eckmann, PE, SE,
Senior Principal, MKA
Rendering Courtesy of Hines

Elliot Wilm, Assistant Project Manager for Walsh Construction, also lauds Aeos鈥� advantages in the Salesforce Tower Chicago project.

鈥淪alesforce Tower is a concrete core with a concrete podium up to just below the street level. After that it鈥檚 structural steel from level one all the way up to the top,鈥� Wilm said. 鈥淯sing a higher strength steel allows you to keep a smaller section size, reducing its embodied carbon. Some of the columns that we鈥檙e picking down on the west side are 50-something thousand pounds. At that point, if it was made out of lesser grade steel, it probably would cause an issue with the crane and its capacity.鈥�

Due to Salesforce Tower Chicago鈥檚 bustling location, transporting and erecting massive pieces of steel poses inevitable logistical challenges. But this high-strength alternative to traditional steel has proven surprisingly advantageous throughout the construction process.

鈥淚n the future, I do see structural steel continuing to be developed constantly with higher strength steels, smaller sections, more efficient designs,鈥� Wilm said. 鈥淚t鈥檚 definitely not going anywhere. We know that it鈥檚 got a good use in office buildings and taller floor conditions, longer span conditions. It鈥檚 been working out well so far, and it鈥檚 going to keep going.鈥�

Rendering Courtesy of Hines

ROLLING WITH THE PUNCHES

Design Changes, Learning Curves, and Game Changing Benefits

Rendering Courtesy of Hines
Salesforce

As with any construction project, Salesforce Tower Chicago had a few adjustments along the way. When Cives Steel Company, the project鈥檚 fabricator, was faced with an unexpected design change, they turned to Yabo亚博集团官方网站 for material that would get the job done鈥攆ast.

鈥淥n the Salesforce Tower [Chicago] project, we actually had a design change after all material had already been ordered,鈥� Brian Wessel, President and General Manager at Cives Steel Midwest said. 鈥淭he owner wanted to change the height of a few floors within the building, which ultimately required reordering several column sizes, at which point we approached Yabo亚博集团官方网站 and were able to get into the next rollings and got the material ordered and delivered here on time without any real effects to our fabrication timeframe.鈥�

Although the new A913 steel posed a short learning curve for the welding processes, Cives quickly realized the advantages of fabricating with grade 65 steel.

鈥淥ne of the exciting things with grade 65 material is the potential for elimination of the preheat requirement that you would find with normal grade 50 material when welding,鈥� Wessel said. 鈥淲e鈥檝e really found that benefit to occur when splicing two grade 65 members together. I will say, initially, a lot of our welders were apprehensive in not performing the preheat. However, as we鈥檝e worked on more and more of the projects requiring grade 65 material, our welders have become more comfortable with it and are now actually eliminating the preheat on a number of splices in our shop where we鈥檙e welding grade 65 material together. So there鈥檚 a lot of possibility there for time savings in the shop, and that can translate into the field as well.鈥�

Salesforce Tower Chicago is far from completion, but it鈥檚 already defining Chicago鈥檚 urban epicenter鈥攁nd the future of steel construction.

鈥淚 feel the future of the steel industry is very bright,鈥� Eckmann said.

With the innovations that we鈥檝e seen over the last number of years with higher grade material, availability of material domestically, shorter lead times, there are just so many things that provide a real bright future for the steel industry.
Dave Eckmann, PE, SE,
Senior Principal, MKA

A new member of the Windy City skyline, Salesforce Tower Chicago displays a beautiful synergy of architecture and engineering made possible by Aeos high-strength steel.

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