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Introduction to Railroad Track Structural Design

BCR2A 09 Railroad Track Design Including Asphalt Trackbeds Pre-Conference WorkshopIntroduction to Railroad Track Structural DesignDon Uzarski, , Vertical Load Distribution, and DeflectionsComponents do not function independently!Each component layer must protect the one Distribution3 Deflection ProfileSource: Selig and Waters, Track Geotechnology and Substructure Management, 19944 Static vs. Dynamic Loads Dynamic loads higher Acceleration from speed Downward rotation of wheel Smaller wheels, faster rotation, more acceleration Speed/wheel influence Pv= P + P (AREMA)wherePv= Vertical Dynamic Load (lbs) = D33x VDwx 100D = Wheel diameter (in)V = Speed (MPH)P = Static Load (lbs) Larger wheels impose less influence Additional dynamic loads from impacts such as caused by wheel flat spots, rail discontinuities ( frog flangeways), Track transitions ( bridge approaches), Track condition, Wheel

Source: Selig and Waters, Track Geotechnology and Substructure Management, 1994. 36 Design Standards, Criteria, and Approaches • Many railroads (including non-U.S. railroads) have established design standards and/or criteria • Differences do exist between railroads. Examples

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