ASME RT-1:2020 pdf free download

ASME RT-1:2020 pdf free download.Safety Standard for Structural Requirements for Light Rail Vehicles and Streetcars.
3.2 LRV and Streetcar Leading End Design for Protection of Street Vehicles
For light rail vehicles and streetcars operating In urban environments sharing roadways and crossings, the design of the leading end of the vehicle shall Incorporate a contoured geometry shape extending across the width of the vehicle, enclosing open area spaces to encourage deflection of struck objects from the path of the LRV/ streetcar and to minimize entrapment, override, and penetration of automobiles and light trucks. Sharp corners and protruding shapes of the contoured geometry design shall be minimized. A bumper, coupler enclosure, pilot beam. skirting, and/or alternative structures may be used to achieve these objectives.
The bottom of the car end structures as described in para. 3.1. with nominal floor height conditions, shall not be greater than the larger of 250 mm (10 in.) above the top of rail or the minimum allowable by the dynamic operating envelope.
The leading end design shall take into account collision compatibility with automotive construction.
NOTE: Side structures for typical automobiles and light trucks are designed for load-bearing reinforcement at a height above the roadway surface ranging from 250mm to 635 mm (10 in. to 25 In.). Matching the leading end geometry and structural design of the Ut V/streetcar to this height reduces the likelihood of LRV/ streetcar penetration into passenger compartments of these vehicles, thus reducing injury propensity. See SAE Paper No. 1999-01-0071 (sectIon 11).
4 STRUCTURAL REQUIREMENTS
The carbody shall withstand the maximum loads consistent with the operational requirements and achieve the required service life under normal opt-rating conditions. The carbody and vehicle design shall be based on the design load requirements specified In sectIon 5. The capability of the structure to meet these requirements shall be demonstrated by calculation and/or appropriate proof-of-design testing. The vehicle is assumed to be of double-end design with an operating cab at either end. If the vehicle is of single-end design, the rear of the vehicle should be of equivalent design, and in a collision. should respond in the same manner as the front end.
The strength of connections between structural members for all structural loading requirements outlined in Tables 4.1 and 4.2 shall exceed the ultimate load- carrying capacity of the weakest member joined. For these load cases, the ultimate load-carrying capacity is defined by applying the load at the location and in the direction specified in Tables 4-1 and 4-2 but increased in magnitude to the maximum load that can be resisted by the structure, as determined by observing that further Increase in deflection will result In a decrease in the load capable of being carried by the structure.