Assessment of Hydrodynamic Properties from Free-Vibration Response of a Prestressed Girder Bridge Model

Details

• Creators:
  Higgins, Christopher ; Loyola-Romero, Jorge ; Yeh, Harry
• Corporate Creators:
  Oregon State University. Department of Civil Engineering
• Corporate Contributors:
  CREATE - Coastal REsearch And Transportation Education ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
• Subject/TRT Terms:
  Bridges Girders Hydrodynamic Pressure Prestressed Concrete Bridges Vibration Control
• Publication/ Report Number:
  2301-10
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  CREATE - Coastal REsearch And Transportation Education
• Abstract:
  An experimental investigation was conducted at Oregon State University’s Hinsdale Wave Research Laboratory to quantify hydrodynamic forces acting on bridge structures subjected to dynamic lateral motions under varying submergence conditions. A bridge model mounted on a sliding rail system was subjected to snap-released free-vibration tests under both dry and submerged conditions using two spring configurations to represent different magnitudes of structural stiffness. Dry tests were used to identify intrinsic mechanical properties of the system, including stiffness, damping, and friction. Submerged tests were then analyzed to estimate hydrodynamic added mass and drag coefficients associated with the bridge geometry at differing submergence. Two complementary parameter identification approaches were applied: numerical optimization of the equation of motion using time-history curve fitting, and an instantaneous method that evaluates the governing equation at key response instants. Results show that added mass - the parameter that characterizes the inertial effect - remains approximately constant across excitation amplitudes and is primarily governed by the submerged geometry of the bridge model. In contrast, the effective drag coefficient varies with oscillation amplitude due to nonlinear transient flow behavior.
• Format:
  PDF
• Funding:
  69A3552348330
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:77187c65b28567aecb847744b52e72dfe215fe3ce9ee4396f2138d1a479a60fc9933380bceca20c26f2e24f95510a9e9318248c601fc2c047dc582331e8cda62
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/92493/dot_92493_DS1.pdf
• File Type:
  [PDF - 2.85 MB ]