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  1. TTK

    Track Clearances at Passenger Platforms

    I was provided with a sample track clearance diagram for an urban transit authority. The project that I am working on does not necessarily have to follow these clearances, but I don't want to deviate from them unless absolutely necessary. One of the clearance dimensions is a distance from the...
  2. TTK

    Historic Alloy Steel Properties

    Hello, I am trying to identify the chemical and strength properties of high strength silicon steel used in the 1920's and 1930's. More specifically, the steel would have been used in bridge construction and it would have likely been the highest strength steel being used in this industry at...
  3. TTK

    Seismic Connection Force for SPC A Bridges

    Section 5.2 of AASHTO Division I-A requires the fixed line of bearings to resist a seismic force equal to 20% of the TOTAL superstructure weight not just the fixed bearing reactions. For long multispan bridges this design force becomes extremely large and creates problems in the fixed bearing...
  4. TTK

    Fabricated Steel W-shapes

    I have a need to use fabricated I-sections rather than wide flange rolled beams (W12 & W14), and would welcome any discussion on the following question:<br><br>Is there a particular size (width/depth) of section that is more economical to fabricate due to the size of the automated SAW equipment...

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