Development of a guideline for estimating tsunami forces On bridge superstructures.

Details

• Creators:
  Yim, Solomon C. ; Boon-Intra, Sutaporn ; Nimmala, Seshu B. ; Winston, Holly M. ; Azadbakht, Mohsen ; Cheung, Kwok F.
• Corporate Creators:
  Oregon State University. School of Civil and Construction Engineering ; University of Hawaii (Honolulu). Department of Ocean and Resource Engineering
• Corporate Contributors:
  Oregon. Dept. of Transportation. Research Section
• Subject/TRT Terms:
  Bridge Members Bridges, Tsunami, Forces, Model Bridge Superstructures Fluid Mechanics Load Factor Repeated Loads Tidal Waves Tsunamis
• Publication/ Report Number:
  OR-RD-12-03
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Section
• Abstract:
  "The Pacific Northwest is vulnerable to seismic events in the Cascadia Subduction Zone (CSZ) that could generate a
  
  large tsunami that could devastate coastal infrastructure such as bridges. In this context, this paper describes the
  
  development of a guideline for estimating tsunami forces on bridge superstructures along the Oregon Coast. A multiphysics
  
  based numerical code is used to perform numerical modeling of tsunami impact on full-scaled bridge
  
  superstructures of four selected bridges – Schooner Creek Bridge, Drift Creek Bridge, Millport Slough Bridge, and
  
  Siletz River Bridge – located on Highway 101 in the Siletz Bay area on the Oregon Coast. Two different types of
  
  bridge superstructure, deck-girder and box sections, are developed in the case of the Schooner Creek Bridge to study
  
  the effect of geometry of bridge cross-section. The results show that tsunami forces on box section superstructures are
  
  significantly higher than the forces on deck-girder sections; therefore, the box section design might not be appropriate
  
  to be used in a tsunami run-up zone. Moreover, numerical simulation of a deck-girder bridge with rigid rails and with
  
  open rail spacing, subjected to identical tsunami loads, was performed to examine the effect of rails on tsunami forces.
  
  The results suggested that horizontal and vertical tsunami forces on bridges with rails are larger than those on bridges
  
  with open rail spacing, up to 20% and 15%, respectively. These numerical results are finally incorporated into the
  
  mathematical formulations from the existing literature to develop a simplified method for estimating tsunami forces on
  
  bridge superstructures. Appropriate empirical coefficients for bridge superstructures under tsunami loads were
  
  evaluated based on an average value of the scattering data from the numerical results. The developed guideline is
  
  intended to be used as a preliminary guidance for design only as it did not account for uncertainties; thus, an
  
  appropriate load factor must be included in the calculations. A previous analysis of tsunami forces on the Spencer
  
  Creek Bridge on the Oregon Coast is revisited to examine the applicability of the guideline developed in the present
  
  work. This paper also presents the results of a study on the optimal number of CPUs for running fluid-structure
  
  interaction (FSI) numerical models of bridge superstructures using LS-DYNA on high-performance computing (HPC)
  
  systems."
  
  
• Format:
  PDF
• Funding:
  SR 500-340
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4f27be64080bf1d92923b7a7e0c33738ad4b2db4034fb11a627c5edd5849f91936162b54f8df08f3cd6242c73d1535491d39ff3046b2df80db5cd8f73fb6da2a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23516/dot_23516_DS1.pdf
• File Type:
  [PDF - 3.06 MB ]