A project to study the pier moment-rotation of compact and noncompact high performance steel HPS70W bridge I-girders was conducted at Colorado State University in the context of examining two restrictions for inelastic design of steel bridge girders in the current edition of the AASHTO LRFD bridge code (AASHTO 1998, and interims through 2001). The first restriction is that inelastic design involving the moment-rotation relationship of steel girders with a yield strength exceeding 50 ksi is prohibited. The second restriction is that the AASHTO LRFD inelastic design methods cannot be used on girders that do not meet the compactness requirements stated in the provisions. To determine whether or not these restrictions should be modified, examination of the pier moment-rotation behavior of HPS70W I-shape girders was undertaken through large-scale laboratory testing and finite element simulation. The experimental and numerical responses agree well and thus validate the numerical model. These results also show that compact/noncompact and composite/noncomposite HPS70W I-girders have the strength and ductility suitable for the application of inelastic analysis and design. This research suggests that the two restrictions for inelastic design of steel bridge girders in the current AASHTO LRFD bridge code should be modified for such girders. This work also demonstrates that the proposed Improved Simplified Inelastic Design (ISID) procedures (Barth, Hartnagel, White, and Barker, 2001) are suitable for high performance steel, HPS70W, compact and noncompact I-girders.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 96 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00964107
  • Record Type: Publication
  • Report/Paper Numbers: MPC Report No. 03-148
  • Files: UTC, NTL, TRIS
  • Created Date: Oct 3 2003 12:00AM