Railway Track & Structures - March 2009 - (Page 18) TTCI R&D Figure 2, left, shows the effect of damping on dynamic forces, peak-topeak values. Figure 3 shows a less than optimal joint slotting. tie plate. Compromise joints, where the rail section changes, also should be placed on suspended foundations. A major western railroad is using track panels for installation of IJs. Figure 1 shows a pair of IJs and new crossties installed as a panel, which allows the replacement and compaction of ballast prior to operation. The panels are configured with wider ties under the IJ to provide improved tie support and provide a longer service life for each IJ. A rail joint foundation should accommodate the unique characteristics of a rail joint. The rail joint is a discontinuity in the rail running surface and is likely to generate dynamic loads. Optimal track stiffness and damping properties can help mitigate the effects of dynamic loading and joint deflection that lead to joint degradation. Higher foundation stiffness is often needed to compensate for the lower stiffness of the joint as compared to the surrounding rail. Uniformity of support is important to minimize rail to bar relative movement. Adding damping to the foundation will allow the rail joint to survive larger dynamic loads. This can be done by adding 18 Railway Track & Structures March 2009 www.rtands.com http://www.aar.com http://www.rtands.com
Table of Contents Feed for the Digital Edition of Railway Track & Structures - March 2009 Railway Track & Structures - March 2009 Contents On Track Industry Today Supplier News AREMA News NRC News TTCI R&D NRC Smashes Attendance Bridge Inspection Battling Bugs Ballast Fundamentals Vital to Keeping Track in Shape Products and Literature People Calendar Sales Representatives Advertisers Index Website Directory Professional Directory Classified Advertising Chicago Perspective Railway Track & Structures - March 2009 Railway Track & Structures - March 2009 - Railway Track & Structures - March 2009 (Page Cover1) Railway Track & Structures - March 2009 - Railway Track & Structures - March 2009 (Page Cover2) Railway Track & Structures - March 2009 - Contents (Page 1) Railway Track & Structures - March 2009 - Contents (Page 2) Railway Track & Structures - March 2009 - On Track (Page 3) Railway Track & Structures - March 2009 - On Track (Page 4) Railway Track & Structures - March 2009 - Industry Today (Page 5) Railway Track & Structures - March 2009 - Industry Today (Page 6) Railway Track & Structures - March 2009 - Supplier News (Page 7) Railway Track & Structures - March 2009 - Supplier News (Page 8) Railway Track & Structures - March 2009 - Supplier News (Page 9) Railway Track & Structures - March 2009 - AREMA News (Page 10) Railway Track & Structures - March 2009 - AREMA News (Page 11) Railway Track & Structures - March 2009 - AREMA News (Page 12) Railway Track & Structures - March 2009 - AREMA News (Page 13) Railway Track & Structures - March 2009 - AREMA News (Page 14) Railway Track & Structures - March 2009 - AREMA News (Page 15) Railway Track & Structures - March 2009 - NRC News (Page 16) Railway Track & Structures - March 2009 - TTCI R&D (Page 17) Railway Track & Structures - March 2009 - TTCI R&D (Page 18) Railway Track & Structures - March 2009 - TTCI R&D (Page 19) Railway Track & Structures - March 2009 - TTCI R&D (Page 20) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 21) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 22) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 23) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 24) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 25) Railway Track & Structures - March 2009 - NRC Smashes Attendance (Page 26) Railway Track & Structures - March 2009 - Bridge Inspection Battling Bugs (Page 27) Railway Track & Structures - March 2009 - Bridge Inspection Battling Bugs (Page 28) Railway Track & Structures - March 2009 - Bridge Inspection Battling Bugs (Page 29) Railway Track & Structures - March 2009 - Bridge Inspection Battling Bugs (Page 30) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 31) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 32) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 33) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 34) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 35) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 36) Railway Track & Structures - March 2009 - Ballast Fundamentals Vital to Keeping Track in Shape (Page 37) Railway Track & Structures - March 2009 - Products and Literature (Page 38) Railway Track & Structures - March 2009 - Products and Literature (Page 39) Railway Track & Structures - March 2009 - People (Page 40) Railway Track & Structures - March 2009 - Calendar (Page 41) Railway Track & Structures - March 2009 - Advertisers Index (Page 42) Railway Track & Structures - March 2009 - Website Directory (Page 43) Railway Track & Structures - March 2009 - Professional Directory (Page 44) Railway Track & Structures - March 2009 - Classified Advertising (Page 45) Railway Track & Structures - March 2009 - Classified Advertising (Page 46) Railway Track & Structures - March 2009 - Classified Advertising (Page 47) Railway Track & Structures - March 2009 - Chicago Perspective (Page 48) Railway Track & Structures - March 2009 - Chicago Perspective (Page Cover3) Railway Track & Structures - March 2009 - Chicago Perspective (Page Cover4)
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