ASME RT-1:2020 pdf download

ASME RT-1:2020 pdf download.Safety Standard for Structural Requirements for Light Rail Vehicles and Streetcars
1 SCOPE
The objective of the passive safety requirements in this Standard is to reduce the risk of passenger injury and damage to equipment resulting from collision accidents by providing a means of protection when other possibilities of preventing an accident have failed. In the event of a collision, application of this Standard provides protection for the occupants of new designs of crashworthy vehicles through the preservation of structural integrity and reducing the risk of overriding and limiting decelerations. This Standard does not extend to the design of the vehicle interior structures that may help reduce injury risk caused by impact between the occupants and the vehicle interior, beyond limiting vehicle acceleration and consequential secondary impact velocity of passengers colliding with interior surfaces. In addition, this Standard provides measures for design of light rail vehicles (LRVs) and streetcars with the goal of reducing risks to street vehicles and pedestrians when involved in collisions.
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: anticlimber: a structural member or mechanism located at each end of the vehicle, used to engage an opposing vehicle, car or other coupled or not, vehicle to resist relative vertical travel between the two carbodies during a collision. articulation: a rotating 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 horizontal profiles. average collision acceleration: the average computed longitudinal acceleration of each car-module of at the vehicle center of gravity. The average computed using a 100 ms simple moving average acceleration is evaluated over the duration period of time from first contact between colliding vehicles to the time when the contact force between vehicles first returns to a magnitude of the collision event and averaged over each car-module zero.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 rail often establishes the overall width of the carbody, exclusive of the side door thresholds, and the side cameras, and mirrors. carbody: the car-module vehicle body comprising its main load-carrying structure above all truck suspension units. It includes all components and structural articulation parts that contribute directly to its strength, stiffness, and stability.collision posts: a set of two structural posts located at each end of the carbody, extending from the bottom of the underframe structure up to the structural shelf. Collision posts may can 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 is the use of a 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.
coupler system: a system that comprises comprised of the coupler head, drawbar, draft gear, and attachments to the carbody, permitting the connection between light rail vehicles or streetcars. The coupler system may be permanently extended in position, or of the folding/retractable type often stored behind a bumper system.