ASME RT-1-2020 pdf free

ASME RT-1-2020 pdf free.Safety Standard for Structural Requirements for Light Rail Vehicles and Streetcars.
crash energy management (CEM): a method of design and manufacture of vehicles that enhances crashworthiness by assigning certain structural members or components of the carbody and the coupler system the task of absorbing a portion of the collision energy in a controlled manner (see energy absorption zone).
crashworthiness: capability of a vehicle structure to protect occupants from injury or fatality in the event of a collision between trains or between trains and obstacles.
end frame: structure inboard of the extreme ends of the vehicle that typically supports the corner posts, collision posts, or collision wall.
end sill compression load (buff load): longitudinal compressive force applied at the ends of the carbody.
energy absorption zone: a zone, typically located at the ends of the vehicle, designed for controlled deformation or crush, while the integrity of the remaining structure outside this zone Is maintained.
light rail vehicle (LRV): vehicle that operates on a light rail transit system and is not part of mainline railroads. Light rail vehicles are capable of boarding and discharging passengers at track/street level or elevated curbs and platforms. The light rail vehicle is a mode of rail transit characterized by its ability to operate on exclusive rights-of-way, shared street running, and through roadway grade crossings (see also sfreetcar).
occupied volume: the volume of the light rail vehicle or streetcar where passengers or crewmembers are normally located during service operation, such as the operating cab and passenger seating arid standing areas. The entire width of a vehicle’s end compartment that contains a control stand is an occupied volume. An articulation or gangway is typically not considered occupied unless there are seats.
override: the behavior of end-to-end colliding vehicles such that one vehicle vertically rides above the other resulting in unintended crush deformations. Overriding can lead to telescoping intrusion of carmodules.
permanent deformation: a condition resulting from a stress greater than the minimum yield strength of the material, or where the material has deformed to the extent that it will not return to its original shape or position within 0.2% after the load is released. Localized stresses above yield are allowable, provided
(a) a plastic finite element analysis (FEA) for the relevant load case shows the affected areas to be small within 1% plastic strain.
(b) the overall structure does not take a permanent set beyond its initial dimensions.
(c) the structure continues to function as designed to meet the requirements of this Standard.ASME RT-1 pdf download.