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Introduction to Railroad Track Structural Design(介绍铁路轨道结构设计)
BCR2A’09 Railroad Track Design Including Asphalt Trackbeds Pre-Conference Workshop Introduction to Railroad Track Structural Design Don Uzarski, Ph.D., P.E. uzarski@illinois.edu Interaction, Vertical Load Distribution, and Deflections Stress Distribution Components do not function independently! Each component layer must protect the one below. 2 Deflection Profile Source: Selig and Waters, Track Geotechnology and Substructure Management, 1994 3 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 + θP (AREMA) where Pv = Vertical Dynamic Load (lbs) θ = D33 x V Dw x 100 D = 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 (e.g. frog flangeways), track transitions (e.g. bridge approaches), track condition, etc. 4 Different Wheel Diameters 33 inches 36 inches 38 inches 28 inches 36 inches 5 Track Stiffness • Rail is assumed to be a beam on an elastic foundation • Modulus of Track Elasticity, u (or k)
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