Review of NCDOT Practices for Analyzing Overhang Falsework

The proper design and detailing of bridge overhang falsework is an important part of the bridge construction process. Improper analysis and design of the falsework system can result in complete falsework system failure, excessive overhang formwork deflections and high locked-in lateral bending stresses in the supporting girders. This could lead to unexpected construction expenses and long construction delays. In an effort to avoid potentially serious problems with the overhang falsework, the North Carolina Department of Transportation (NCDOT) provides an extensive review of the detailed drawings and calculations submitted for each bridge project. In an effort by the NCDOT to produce standardized details for bridge overhang falsework, a need to review the current analysis and design procedures adopted by the department was identified. The objective of this research project was to provide an independent review to ensure that the analysis procedures and the design assumptions integrated into the current guidelines are in compliance with basic engineering principles and the latest ACI and AASHTO specifications. Discussions with design consultants and contractors were included as a part of the independent review. To assist with the independent review a spreadsheet program for the analysis and design of overhang falsework systems was developed utilizing the current NCDOT design and analysis provisions. It was concluded that the NCDOT analysis and design guidelines were in compliance with basic engineering principles and the current ACI and AASHTO design specifications. Additional observations, recommendations and conclusions were developed as a part of this study and are included within this report.

Language

  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 44p

Subject/Index Terms

Filing Info

  • Accession Number: 01152590
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/NC/2006-22
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 1 2010 12:09PM