ASME RT-1-2009 pdf free download.Safety Standard for Structural Requirements for Light Rail Vehicles.
1.1 Subjects Covered by This Standard
This Standard applies to carbodies for newly constructed light rail vehicles for transit passenger service in North America. The Standard defines requirements for the incorporation of passive safety design concepts related to the performance of the carbody of light rail vehicles in collisions, so as to enhance passenger safety and limit and control damage. This Standard does not cover heavy rail transit vehicles; automated people movers; and freight, commuter, high-speed, or any other rail vehicles under the jurisdiction of the Federal Railroad Administration.
1.2 Subjects Not Addressed by This Standard
There are several issues related to safety that are not addressed, such as, but not limited to
(a) structural repairs
(b) fatigue
(c) corrosion
(d) fire protection (NFPA 130)
(e) interior vehicle design
(f) emergency egress from vehicle (NFPA 130)
1.3 Effective Date
This Standard applies to carhodies of newly constructed light rail vehicles and streetcars for transit passenger service in North America ordered 18() days following the date of issuance of this Standard by the Standards Committee and ASME.
2 DEFINITIONS
This Standard relies, where practical, on terms already
in use by ASME, the American Public Transportation
Association (APTA), and the Institute of Electrical and
Electronics Engineers (IEEE). For the purposes of this
Standard, the following definitions apply:
anIklinzb’r: a structural member located at each end of the vehicle, used to engage the anticlimber of an opposing or other coupled vehicle to resist relative vertical travel between the two carbodies during a collision.
arhculatwn: the connection sometimes used at the center of a vehicle or at the intermediate ends of carbody sections to allow negotiation of tracks with various vertical and horiiontal profiles.
average acceleration: the average computed longitudinal acceleration at the vehicle center of gravity predicted by finite element modeling of a collision. The average computed acceleration is defined over a period of time from first contact between vehicles to a time when the contact force between vehicles first reaches a magnitude of iero.
belt rail: a longitudinal structural member in the side frame arranged below the passenger side windows.
carbody (light rail): the vehicle body comprising its main load-carrying structure above all truck suspension units. It includes all components and structural articulation connector parts, if any, that are connected to this structure and contribute directly to its strength, stiffness, and stability. Mechanical or electrical equipment and other mounted parts are not considered part of the carbody, though their attachment brackets are. The “coupler” ends of the carbody are the outside vehicle ends that contain the means for coupling to another vehicle. The “intermediate” ends, if any. contain the articulation system.
closing speed: the speed of a vehicle relative to another object or vehicle at the time of initial impact.
collision posts: a set of two structural posis located at each end of the carbody, extending from the bottom of the end undcrframe structure up to the structural shelf. 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 a collision post is the use of a 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.
consist: the makeup or composition of the individual units of a train, generally by number and type of vehicle.