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New Jerusalem Road Bridge

 

New Jerusalem Road Bridge

The New Jerusalem Road Bridge, Woolwich Township  is located on a dead end road and spans over the Canagagigue Creek. 

 

There are only two land owners located on the opposite side of the creek which use the bridge.

 

The bridge was posted at 10 tonne but was being used daily by large milk trucks and grain delivery trucks which weighed well over 10 tonnes.

 

The municipality began the process to replace the bridge with a new one which would be capable of supporting the daily traffic.


In lieu of replacement it was proposed to perform a full scale load test on the bridge in order to determine the real load carrying capacity of the bridge with the hope to save the structure.
Saving the structure would result in significant cost savings.  The bridge was load tested by installing fibre optic stands and fibre optic extensometer.


The result of the load testing showed that the bridge was behaving in an elastic manner and that the test load resulted in near uniform load sharing across the width of the bridge.  Based on the load testing it was concluded that the bridge can be rated at 25 tonnes, a 2.5 times increase over the original load posting.  The new load rating for the bridge would allow the truck traffic to cross the bridge and the Township now has the peace of mind to know that the bridge is safe.

 

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Nafziger Road Bridge

 


 

The Nafziger Road Bridge is a 3 span reinforced concrete bridge.  No load limit posting on the bridge, however two previous structural evaluations for the bridge indicated that the middle span was deficient with respect the the Bridge Design Code.  There where no drawings for the bridge and therefore the reinforcing details are unknown.

 

Due to the previous engineering studies and lack of physical information on the bridge, a full scale  load test to determine how the structure behaves under load was completed to determine if the structure is safe.


Fiber Optic strain strands were installed on the T beams of the center span and the bridge was load tested.

 

The load testing showed that the center span of the bridge performed significantly better than theoretical calculations would suggest for the bridge.  The load test also showed that the load distribution across the bridge deck to the T beams was different than the Highway Bridge Design Code suggests.

 

It was concluded that the center span of the bridge complies with the requirements of the Highway Bridge Code and does not need strengthening.  This resulted in a significant saving of money to the owner of this bridge.

 

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