Diaphragm Orientation Effect on the Rotation of Exterior Girders during Construction in Skewed Bridges

The unbalanced eccentric loads on the overhang portion of the deck slab during construction cause excessive rotation in the exterior girders and deflection of the overhang formwork. Hence, issues during the construction occur in addition to future deficiencies in the deck slab. This study investigates the effect of different lateral bracing system layouts on exterior girder rotation in skewed bridges during construction. Finite element models of bridges with different diaphragm layouts and screed machine orientations are developed to examine this phenomenon. The results showed that utilizing the diaphragms perpendicular to the girders leads to lower rotation values compared to using diaphragms parallel to the skew. It also concluded that placing the screed machine perpendicular to the girders can cause a high differential rotation between both exterior girders.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 57-67
  • Monograph Title: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components

Subject/Index Terms

Filing Info

  • Accession Number: 01723001
  • Record Type: Publication
  • ISBN: 9780784482230
  • Files: TRIS, ASCE
  • Created Date: Apr 22 2019 3:02PM