Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses with Respect to Remaining Fatigue Life

The objective of this study is to evaluate an estimate of the remaining life in cantilever and butterfly steel overhead sign trusses based on American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) specifications and to develop automated C# software that performs the following: (1) Utilizes the Kansas wind speed database established during the earlier project (KSU-17-4) by extending it to every county in the state of Kansas. (2) Computes the equivalent static wind loading for the fatigue analysis based on the galloping-induced cyclic loads, natural wind gust pressure and truck-induced gust pressure. (3) Develops an interface to model cantilever and butterfly sign trusses in STAAD Pro. (4) Drives STAAD Pro to analyze the various types of overhead sign trusses and generates the stress ranges corresponding to every structural component. (5) Evaluates the remaining fatigue life for each steel component based on the damage accumulation accounted for through ratios of actual to ultimate cycle repetitions (Minor rule).

Language

• English

Project

• Status: Active
• Funding: $60,090
• Contract Numbers:

  K-TRAN: KSU-20-3

  RE-0789-01

  C2144

• Sponsor Organizations:

  Kansas Department of Transportation

  Eisenhower State Office Building
  700 SW Harrison Street
  Topeka, KS  United States  66603-3754
• Performing Organizations:

  Kansas State University Transportation Center

  Kansas State University
  Department of Civil Engineering
  Manhattan, KS  United States  66506
• Principal Investigators:

  Rasheed, Hayder

• Start Date: 20190811
• Expected Completion Date: 20240731
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Cantilevers; Databases; Estimating; Fatigue limit; Gusts; Load and resistance factor design; Overhead traffic signs; Repeated loads; Service life; Sign supports; Software; Speed; Trusses; Wind; Wind resistant design
• Geographic Terms: Kansas
• Subject Areas: Bridges and other structures; Design; Environment; Highways; Maintenance and Preservation; Operations and Traffic Management;

Filing Info

• Accession Number: 01751168
• Record Type: Research project
• Source Agency: Kansas Department of Transportation
• Contract Numbers: K-TRAN: KSU-20-3, RE-0789-01, C2144
• Files: RIP, STATEDOT
• Created Date: Sep 1 2020 1:15PM