Tyler L. Krahn

Experience

Tyler Krahn joined WJE in 2008 and has focused on investigation and inspection of steel and reinforced concrete structures with an emphasis on bridges. Most of his bridge projects involve fracture critical inspection of steel components, including use of specialized rope access techniques when appropriate. Mr. Krahn is also experienced in fatigue and fracture retrofit design and installation of bridges. He is trained in the use of visual, ultrasonic, and magnetic particle nondestructive testing techniques and has extensive experience using ultrasonic testing to evaluate bridge pins.

Mr. Krahn has been heavily involved in the investigation and repair installation for multiple bridge member or component failures, including a cable-stayed pedestrian bridge cable connection failure and a deck truss primary compression chord buckling failure due to fire damage. His reinforced concrete experience has focused on investigating and repairing structural foundation problems, especially for wind turbine generators.

REPRESENTATIVE PROJECTS

Nondestructive Testing

• Prefabricated Steel Building - Evansville, WI: Ultrasonic inspection of complete joint penetration welds in plate girders
• Pin-Connected Bridges - ID: Visual inspection and ultrasonic testing of bridge pins in twelve bridges throughout Idaho
• Huey P. Long Bridge - Jefferson Parish, LA: Ultrasonic inspection of pins to detect fabrication defects
• Truss Bridges - TN: Ultrasonic inspection of more than three hundred truss pins at various locations
• US-41 Bridge - Princeton, IN: Ultrasonic inspection of pin-and-hanger assemblies
• Pony Truss Bridges - OK: Ultrasonic inspection of pins at twenty-four truss bridges

 

Bridge Engineering

• Fremont Bridge - Portland, OR: Fatigue retrofit installation in 1,200-foot-span, steel tied-arch bridge
• Bridge of the Americas - Panama: Inspection of 5,425-foot steel truss bridge over the Panama Canal using rope access
• Julien Dubuque Bridge - Dubuque, IA: Inspection of 845-foot span steel arch truss using rope access techniques
• State 291 Bridge - Kansas City, MO: Field measurements and retrofit of steel deck-truss primary gusset plates
• IA-415 Over Saylorville Reservoir - Polk City, IA: Retrofit installation at 348 lateral gusset plates
• I-40 and SH100 Bridges - Gore, OK: Inspection of two-girder bridges using rope access techniques
• Guy West Pedestrian Bridge - Sacramento, CA: Rope access inspection of suspension bridge
• Hawaii Concrete Bridge Evaluation - Hilo: Inspection, assessment, sampling, and load rating of four reinforced concrete bridge substructures
• Two-Girder Bridge Retrofits - IA: Retrofit work at more than two dozen bridges to address constraint induced fracture concerns

 

Repair and Rehabilitation Design

• Holy Name Cathedral - Chicago, IL: Inspection, analysis, repair development, and construction observation for historic wood roof structure damaged by fire
• Clubhouse Ceiling Distress Repair - Hanover Park, IL: Inspection, analysis, and repair development for wood-framed ceiling structure

 

Structural Evaluation

• Light Pole Inspection - Rapid City, SD: Visual inspection of more than 2,500 light pole and signal mast-arm structures

 

Failure Investigation

• 1.5 Megawatt Wind Turbine - Fenner, NY: Investigation of collapse
• Sabo Bridge - Minneapolis, MN: Investigation of cable connection failure and repair installation
• Liberty Bridge - Pittsburgh, PA: Investigation and repair supervision for deck truss compression chord member buckling failure due to fire

Professional Affiliations

American Welding Society
Society of Professional Rope Access Technicians

Registrations

NHI Course 130055 - Safety NDT Level II UT and MT
Inspection of In-Service Bridges
NHI Course 130078 - Fracture Critical Inspection Techniques for Steel Bridges
Professional Engineer in IL
Society of Professional Rope Access Technicians - Level I  Technician
Structural Engineer in IL

Education

University of Minnesota
Bachelor of Civil Engineering, 2006

Purdue University
Master of Science, Civil Engineering, 2007