2013 Session: AFF20

2013 Session: AFF20

  • Lack-of-fit Analysis And Locked-in Forces Calculation-a Case Study Of A Curved Steel I-girder Bridge During Construction
    Abstract: Curved bridges generally exhibit critical attributes during construction, such as torsional deformations, diaphragm forces, and potential for uplift at bearings, which may induce fit-up difficulties. However, conventional analysis commonly employed in currently practice only addresses the internal forces associated with no-load fit (NLF) detailing without considering lack-of-fit effects. In this article, a method of lack-of-fit analysis was adopted to solve this problem and applied to a real case study. In this case study, the supports of a steel-concrete composite curved bridge were uplifted in the course of construction. A 3D finite element model was established by SAP2000 to simulate the erection procedures. Lack-of-fit analysis was conducted from total dead load fit (TDLF) detailing, in which locked-in forces in the structure were determined based on the diaphragm drops due to differential camber on and between girders. The results proved that the support uplift was temporary during erection and it was validated by bridge testing. It is concluded that this method of lack-of-fit analysis (3D-FEA method or even 2D-gird method) can simulate construction procedure, estimate lack-of-fit effects, and calculate locked-in forces from steel dead load fit (SDLF) detailing and total dead load fit (TDLF) detailing.
    Authors: Fu, Chung C.; Zhao, Gengwen; Xiang, Changsheng; Ahmed, Mohamed
    Authors: Fu, Chung C.; Zhao, Gengwen; Xiang, Changsheng; Ahmed, Mohamed
    Year: 2013
    Document Type: Paper
    Subject: Bridges and Other Structures; Design
    Session: AFF20
    Paper Number: 13-3194
  • Lack-of-fit Analysis And Locked-in Forces Calculation -a Case Study Of A Curved Steel I-girder Bridge During Construction
    Authors: Fu, Chung
    Authors: Fu, Chung
    Year: 2013
    Document Type: Presentation
    Session: AFF20
    Paper Number: 13-3194
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