DART Expansion, Dallas TX
As we move into 2009, we are finishing up with our data preparation for the DART expansion project in Dallas. Of the 26 miles of new rail corridor, about 12 miles are on elevated structures consisting mostly of composite deck on AASHTO beams. Our last major task is the development of cambered digital terrain models for the deck that reflect the superposition of nominal geometry and anticipated dead-load deflection. This allows survey crews to easily set grades for the stay-in-place deck forms without struggling with grade sheets in the field. A similar set of DTMs with partial camber can be used to grade the plinths that carry rails on the deck. Definitely another interesting and enjoyable project.
June 12th, 2009 at 12:13 pm
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June 15th, 2009 at 6:12 am
Hi, very nice post. I have been wonder’n bout this issue,so thanks for posting
June 16th, 2009 at 6:54 am
How soon will you update your blog? I’m interested in reading some more information on this issue.
June 27th, 2009 at 1:01 pm
The DART project is pretty much wrapped up for me. Moving on to some interesting bridge and transit projects in the New York and New England areas. These are two of my favorite types of work. Transit work is fun because the alignment mathematics are more interesting than typical roadways, and bridges are particularly challenging because of the time/stage dependent nature of their geometry.
Steve Moore