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Help with Traffic Lane Optimization



I load rating a 3 span steel through girder bridge. The bridge has 2 girders spaced at 30ft apart with floorbeams running from girder to girder. The bridge is on a 21 degree skew. The travelway is 26’-0” wide and is centered between the girders. I would like to use the “traffic lane optimization” commands to find the maximum moment & shear on the girders and on the floorbeams.

However, I am not able to find the definitions of certain parameters in thehttp://manual.midasuser.com site. For example, I am confused about the “Anal. Lane Offset” and “Margin” parameters. Referencing the images below, can you please tell me what I need to enter into each of the “Traffic Lane Optimization Properties”? I have attached a hand sketch of all the wheel positions I would like to check. How many lanes do I have to define in order to capture all of the cases?

Answer:Dear User,

We are in the process of updating the manual, meanwhile you may refer the image below,

So, for the vehicle positions and carriage way as posted by you, following should be the input for Case 1 :
Optimization Lane: 20'
Lane Width: 12'
Anal. Lane Offset: 2'
Wheel Spacing: 6'
Margin: 0'
Offset distance to lane center: The input here is the eccentricity of center of carriageway from the reference element in accordance to which the lane is defined.

I hope this clarifies the doubts on input. Kindly let us know if further assistance would be required
Creation date: 10/27/2017 7:59 AM ()      Updated: 10/27/2017 5:31 PM ()
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