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 superstructures
  • Bridge members
  • Tsunamis
  • Tidal waves
  • Fluid mechanics
  • Load factor
  • Repeated loads
  • Bridges, Tsunami, Forces, Model
• 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."
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• Format:
  PDF
• Funding:
  SR 500-340
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23516/dot_23516_DS1.pdf
• File Type:
  [PDF - 3.06 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4f27be64080bf1d92923b7a7e0c33738ad4b2db4034fb11a627c5edd5849f91936162b54f8df08f3cd6242c73d1535491d39ff3046b2df80db5cd8f73fb6da2a