Design of steel piles for integral abutment bridges

This thesis deals with integral abutment bridges, with focus on the design of steel piles carrying such bridges. As outlined in Chapter 1, integral abutment bridges have large advantages over bridges with expansion joints and bearings. However, there are some questions to be answered and some of these questions are formulated as research questions in this thesis. Cross shaped steel piles were axially loaded to failure, simulating the effect of the bridge length varying with the annual temperature variations. The tests showed that 25 mm imposed deformations of the pile tops do not significantly influence ultimate capacity of the piles (Chapter 2 and Paper I). In order to study how steel piles in integral abutments are used in different countries an international workshop was arranged in Stockholm and a literature study was conducted (Chapter 3). Furthermore the bridge over Leduån was designed, built and monitored. The monitored values with respect to deflections and pile stresses gave a fairly good agreement with FEA carried out with soil parameters from the Swedish Bridge Code Bro 94 (Chapter 4, Paper III and Paper IV). In order to investigate the behavior of steel piles in fatigue with strains exceeding yield strains, bending tests of piles encased in concrete were carried out (Paper V). The tests demonstrated that a pile can accommodate strains many times the yield strain and still last for hundreds of cycles. Finally the results above are discussed and a design method is suggested in Chapter 5. In Chapter 6 answers to the research questions from Chapter 1 are formulated and discussed.

Language

  • English

Media Info

  • Pagination: 170
  • Serial:
    • Doctoral thesis
    • Publisher: Luleå University of Technology, Sweden
    • ISSN: 1402-1544

Subject/Index Terms

Filing Info

  • Accession Number: 01631301
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • ISBN: 9789175834160, 97891
  • Files: ITRD, VTI
  • Created Date: Mar 30 2017 12:16PM