Research notes : base isolation bearings hold up.

Oregon. Dept. of Transportation. Research Unit

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Research notes : base isolation bearings hold up.

2003-05-01
By Oregon. Dept. of Transportation. Research Unit

[PDF-331.98 KB]

English

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Alternative Title:

Base isolation bearings hold up.
Corporate Creators:

Oregon. Dept. of Transportation. Research Unit
Subject/TRT Terms:

[+]

Base Isolation Bearings Bridge Decks Bridges Dynamics Earthquake Resistant Design Inspection Superstructures
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
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:2acd494b6e834dffafc31d30e3cd964306466416b87bb1148dcaf5bfbfccfaee
Download URL:

https://rosap.ntl.bts.gov/view/dot/22622/dot_22622_DS1.pdf
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Research notes : base isolation bearings hold up.

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