A pre-cast concrete bridge bent designed to re-center after an earthquake

In this study the post-earthquake residual displacements of reinforced concrete bridge bents were investigated. The system had mild steel that was intended to dissipate energy and an unbonded, post-tensioned tendon that was supposed to remain elastic and re-center the column. The columns tested had different mild steel to prestress ratios, which affected their re-centering ability. Two 40 percent scale specimens with large-bar connection details and a central unbonded, post-tensioned tendon were tested by using pseudo-static loading. The large-bar system is a rapidly constructible precast system for use in seismic regions. The test columns had re-centering ratios of 1.6 and 1.2. A column with the same connection details but no prestress and a re-centering ratio of 0.9 was used as a reference. The displacement at zero force in the test was used as a proxy for the residual displacement after an earthquake. The tests showed that columns with a larger re-centering ratio did experience lower residual drifts, although this distinction only became clear for drift ratios that exceeded 2 percent. The tests also showed that increases in post-tensioning force led to slight increases in damage at high drift ratios.

Language

  • English

Media Info

  • Pagination: 105p + appendices
  • Serial:
    • Issue Number: WA-RD 684.3

Subject/Index Terms

Filing Info

  • Accession Number: 01384095
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI, STATEDOT
  • Created Date: Aug 22 2012 4:12PM