In our previous posts we have discussed about scouring produced foundation failure of different bridges of New Zealand. Our aim is, here, same and our concern is United States. Scouring during floods and sometimes in other times are the main causes of foundation failure of bridges in United States.
Here we are providing some failure of bridges in United States due to foundation scouring:
- Schoharie Creek Bridge
- I-5 Bridge
- Bridge AA-438
- CRANDIC bridge
1. Schoharie Creek Bridge:
Location: On Schoharie creek in New York near vicinity of fort hunter.
Date of failure: 5th April, 1987
Causes of failure:
Melting water of snow together with heavy rainfall produced cumulative foundation scouring which led to collapse of this bridge.
Five vehicles were on the bridge at this time and bodies of victims were found downstream throughout three weeks. 10 people were killed during this collapse. This was one of the most catastrophic failures due to foundation scouring of bridges.
2. I-5 Bridge:
on Los Gatos creek in the vicinity of Coalinga, California.
Date of failure: 10th march, 1995.
Causes of failures:
Failed due to scouring produced by large flood. A minimum potential scour depth of 25.2 ft was determined by standard analysis approach provided by HEC-18 & 20. This resulted column to bend at less embedment. More over significant exposed portion have no reinforcing steel.
Dear reader we will discuss rest two bridge failure in our next part of this topics and economic annual loss involvement due to such failure.