Progress on NCHRP 12-103: Bridge Superstructure Tolerance to Total and Differential Foundation Movements

Posted by on May 9, 2017 in News and Announcements, Top News | 0 comments

Project 12-103 of the National Cooperative Highway Research Program (NCHRP) is a research study to evaluate the tolerance of bridge superstructure to total and differental foundation movements. NCS GeoResources (NCSG), through participation of Naresh Samtani, is a key part of a Research Team (RT) led by Professor Frank Moon of Rutgers to develop a comprehensive understanding of the levels of support movements that bridges may tolerate before exceeding strength or service limit states. This research was devised to satisfy the following objectives:

  1. Develop analytical procedures to objectively determine the acceptable levels of bridge foundation movements based upon superstructure tolerance consideringAASHTO LRFD strength and service limit states (Phase II).
  2. Propose revisions to theAASHTO LRFD Bridge Design Specifications that provide rational guidance for foundation movement limits that shall include vertical and rotational movements (Phases III and IV).

Phase II focuses on satisfying Objective 1 through (a) estimating tolerable support movements for common bridge types, (b) identifying the parameters that influence the level of tolerable support movement, and (c) developing simplified expressions for estimating tolerable support movement. In addition, this research examines the current AASHTO LRFD criteria (also often referred to as “Moulton’s criteria”), which were developed under previous specifications (i.e. AASHTO Standard Specifications), in light of the results obtained through (a).

The Phase II report has been completed and accepted by NCHRP and now the project has moved into Phase III. 

The work from this research will mesh in with the work done by Samtani and Kulicki (2016) and will be included in AASHTO and FHWA documents in the near future.  Stay tuned and contact us  if you would like more information.

Leave a Comment