ASME RT-2:2014 pdf free download

ASME RT-2:2014 pdf free download.Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles.
anticlimber: a structural member or mechanism located at each end of the vehicle, used to engage an opposing vehicle, coupled or not, to resist relative vertical travel between the two carbodies during a collision.
antitelescoping plate: a single structural member that spans the full width of the carbody at the top of the end frame, that is attached to the tops of the collision and corner posts, and is designed to transmit the collision and corner post top reaction loads to the carbody sides.
articulation: a rotating connection at the intermediate ends of carbody sections to allow negotiation of tracks with various vertical and horizontal profiles.
average collision acceleration: the longitudinal acceleration of each car computed using a 100-ms simple moving average over the duration of the collision event and averaged over each car.
belt rail: a longitudinal structural member of the carbody located on each side of the carbody below the passenger side windows. The distance between opposite belt rails often establishes the overall width of the carbody, exclusive ofthe side door thresholds, side cameras, and mirrors.
car see heavy rail transit vehicle.
carbody: the main load-carrying structure above all truck suspension units. It includes all components that are connected to this structure and contribute directly to its strength, stiffness, and stability.
collision posts: a set of two full-height structural posts located at each end of the carbody, extending from the bottom of the underframe structure up to a structural shelf or an antitelescoping plate. Collision posts may be made of several structural members assembled to each other, provided that the required performance is met. They are located at the approximate one-third points across the width of the vehicle, and are Forward of the seating position of any passenger or crew person. An alternative to collision posts isa collision wall.
collision wall: a structure at the leading end of the vehicle spanning the area between the structural shelf, corner posts, and top of the underframe. The use of a collision wall Is intended to provide a collision performance equivalent to a collision post design.
7.3 ALuminum
Structural use of aluminum and aluminum alloys shall be in compliance with APTA PR-CS-S-al 5-99 or an equivalent.
7.4 NonmetaLLic Materials
If nonmetallic materials are being utilized, then this Standard shall be applied to the extent possible. Data from internationally accepted standards that represent the performance of the material may be applied pending demonstration of equivalency to a U.S. code or standard.
8 CRASH ENERGY MANAGEMENT (CEM)
To Improve crashworthiness, this Standard requires that the principles of Crash Energy Management (CEM) be applied. including the use of analytical tools to verify that the structural design and CEM features are stable and crush or deform as intended. Evaluation of the load cases specified in para. 4.9 and Table 4.9-1 shall be performed using time-dependent, large deflection computer simulations, Validation of the crush behavior by test shall be performed if specified.
The vehicle shall be designed to crush and absorb energy in a controlled manner when subjected to end collision loads. The design shall be based on the CEM structural energy absorption zones per the scenarios specified in Table 4.9-1. A CEM and collision survivability strategy shall be developed that is compliant with the criteria provided herein. The strategy shall define the specific features of the carbody that will provide the required zones of energy absorption.
NOTE; The specitications given within this Standard [or CEM represent a basis for protecting passengers when trains are involved in collisions with like trains or with obstacles. The specifications do not address all the considerations that may need to be examined inclusive of vehicle design and operating variances that may lead to incompatibility related to strength. geometry, or variations in the condition of coupler engagement during collisions. It is recommended that the purchaser and supplier agree on a compatibility plan to ensure performance-based scenarios are applicable.