Bridge Design for Earthquake Fault Crossing: Synthesis of Design Issues and Strategies

Two approximate procedures, namely, the Fault Rupture-Response Spectrum Analysis (FR-RSA) and Fault Rupture-Linear Static Analysis (FR-LSA) procedures, were recently developed as alternatives to the nonlinear response history analysis (RHA) for bridge crossing fault rupture zones. However, obstacles still exist limiting the widespread acceptance of the approximate procedures, particularly in analysis of curved bridge and in implementation of the procedures on existing bridge analysis and design platform. To address these issues, this report first analyzed two actual multi-span curved bridges, which are typical of many bridges in California, to examine the adequacy of the FR-RSA and FR-LSA procedures. It is shown that the FR-RSA procedure provides estimates of bridge response that are close enough to the “exact” RHA results in all considered cases and therefore it is recommended for future practical application. In addition, the FR-LSA procedure is found to provide reasonable results for one bridge with three spans but overly conservative results for the other one with four spans. Analysis results from the validation work also demonstrate that the quasi-static response alone (which is caused by ground displacement offset only) is inadequate in estimating the total bridge response although it may be a significant portion of the total bridge response and even dominate the response in some cases. Finally, the research team of this project assisted Computers & Structures, Inc. in implementing the FR-RSA procedure on CSiBridge. Taking one of the considered bridge as an example, the report describes the process of model development using the FR-RSA procedure on CSiBridge, followed by assessment of the adequacy of this implementation.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Tables;
  • Pagination: 121p

Subject/Index Terms

Filing Info

  • Accession Number: 01594890
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: CA12-2177
  • Contract Numbers: 65A0379
  • Files: CALTRANS, TRIS, STATEDOT
  • Created Date: Mar 9 2016 5:04PM