Soldier Field

CTLGroup was retained to evaluate structural steel plate material and connections during construction while structural steel tubular members were erected to support the scoreboard at the north end of the stadium. While inserting bolts into the end plate/gusset plate connection, the end plate fractured in a brittle fashion between the bolt hole and the edge of the plate. Subsequently, a second fractured plate was discovered and removed from the structure.

Based on conversations with key personnel, CTLGroup performed a cursory review of the erection sequence and procedures being used by the supply firm at the time the plate fractured. CTLGroup determined that the erection procedures being used were commonly accepted methods.

Our investigation indicated that the fractures occurred during a common erection procedure performed at low temperatures due to the presence of the inclusions. Additional testing was recommended to further define the behavior of the plate material under the service conditions.


Buildings & Facilities

Consulting Services

Building Science

Project Specification Review & Development

Forensic Engineering

Product Failures & Material Incompatibilities

Materials Science + Engineering

Structural Engineering + Evaluation

Non-Destructive Evaluation

Repair, Restoration, Retrofit

Structural Condition Assessment

Laboratory Services

Concrete + Cement-Based Materials

Chemical Services


Physical Testing of Concrete + Mortar

Polymers / Organics

Specialized Testing

Soldier Field is the oldest standing NFL stadium in the country, opening in 1924 with a capacity of 45,000.


Year Completed


Hours Worked


Seated Capacity After 2003 Renovations

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