Research notes : base isolation bearings hold up.

Details

• Alternative Title:
  Base isolation bearings hold up.
• Corporate Creators:
  Oregon. Dept. of Transportation. Research Unit
• Subject/TRT Terms:
  • Earthquake resistant design
  • Bridges
  • Bearings
  • Base isolation
  • Inspection
  • Bridge decks
  • Superstructures
  • Dynamics
• Publication/ Report Number:
  RSN 03-05
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Unit
• Abstract:
  Existing bridges, such as the Marquam Bridge in Portland, are given seismic retrofits, and new bridges are designed to more demanding seismic standards. Other structures may have a seismic device built in. The ODOT Research Unit has monitored one such structure since 1994 – the connector ramp from the Clackamas Highway (224) to 99E near Milwaukie, Oregon. ; The seismic device used on this structure is a base isolation bearing made by Dynamic Isolation Systems, Inc. Note in the drawing below that the bearings are rubber-based with lead cores. These bearings carry the load of the deck and superstructure of the bridge. Their action is similar to motor mounts in a car engine. Their flexible nature allows them to move with the earthquake motion and then return to their original position.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22622/dot_22622_DS1.pdf
• File Type:
  [PDF - 331.98 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:022560f72212cef6a7e939fcf49cd6cbca8490dfe3e4dec328c0c99d9f2352ed45db6c642f882433d51e35dd5baba65aa481a591abc4c4a69abba9e6041b55c8