Bruce,

 

As you are aware, the Town of Addison is currently evaluating the bridge construction.  During the process, the following two questions have emerged:

 

1.	The traffic barrier is currently designed as a load bearing member for the bridge.  What would be the effect on the integrity of the bridge is a large vehicle, i.e. a moving van,
were to slam into the traffic rail? Would the structural integrity of the bridge be compromised? Would this necessitate removing and reconstructing the bridge deck?

 

2.	The boring logs in the geotechnical report on file with the Town of Addison for Vitruvian Park show a 7’ or less penetration into the bearing strata around the bridges.  The bridge
piers are designed to go to a depth of 45’ for the straight pier and 71’ for the angled pier into the bearing strata.  It seems that the assumption was made that the bearing strength
of the strata was consistent through this depth.  Is this assumption reasonable? Should some additional bores be taken in and around the bridge structures in order to ascertain the consistency
of the bearing strata?

 

Please review these questions and respond at your earliest convenience.  If you would like to discuss the questions in more detail, please feel free to contact me.

 

Thanks,

Clay Barnett, P.E.

Town Engineer

Town of Addison

16801 Westgrove Drive

Addison, TX 75001-2818

Office: (972) 450-2857

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