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ASME RT-1-2015 pdf download

ASME RT-1-2015 pdf download.Safety Standard for Structural Requirements for Light Rail Vehicles.
coupler system: a system comprised of the coupler head, drawbar, draft gear, and attachments to the carbody, permitting the connection between light rail vehicles or streetcars. crash energy management (CEM): a method of design and manufacture of vehicle structures that enhances crash- worthiness by assigning certain sections of the carbody the task of absorbing a portion of the collision energy by crushing in a controlled manner (see structural energy absorption zone). The controlled crushing and energy absorption functions are typically assigned to special carbody structural members in the structural energy absorption zone that are designed to crush in a predict- able and stable manner over a distance that depends on the design of the member and the desired amount of energy absorption. crashworthiness: the ability of a carbody to manage the collision energy while maintaining structural integrity and limiting the level of acceleration, so as to minimize casualties to occupants and pedestrians and damage to other vehicles. end frame: structure inboard of the extreme ends of the vehicle supporting the anticlimber, corner posts, and collision posts. end sill compression load (buffload): longitudinal compres- sive force applied at the ends of the vehicle, usually at the anticlimber. light rail vehicle (LRV): LRVs operate on a light rail transit system, and are not part of main-line railroads. Light rail vehicles are capable of boarding and discharging passengers at track/street level or elevated platforms. The light rail vehicle is a mode of rail transit character- ized by its ability to operate on exclusive rights-of-way, shared street running, and through roadway grade crossings. (See also streetcar.) permanent deformation: for the purpose of design, perma- nent deformation is 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 after the load is released. Similarly, when testing a structure, permanent deformation is characterized by a loading condition resulting from physical stress greater than the yield strength of the material, or where there is evidence that the material has deformed to such an extent that it will not return to its original shape or position after loading is removed. streetcar: a category ofLRV that operates mainly at street level in road traffic, normally as single units or two units per train and at a maximum speed of 70 km/h (44 mph). Vehicles are typically smaller, lighter, and narrower in width than light rail vehicles. 2 structural energy absorption zone: a zone, typically located at the ends ofthe carbody, designed for controlled defor- mation or crush when the carbody is loaded beyond its elastic capacity, while the integrity of the remaining carbody is maintained. structural sheathing: the parts, if any, of the exterior cov- ering of the carbody that are used as structural compo- nents of the vehicle and included in the stress analysis. structural shelf (light rail): the structural member in the end frame that spans the full width of the carbody and is attached to the tops of the collision posts and to the corner posts, and designed to transmit the collision post top reaction loads to the carbody sides. survival volume: volume of the vehicle body containing the occupants that is maintained during the collision and that is sufficient for their survival without major injury. telescoping: the intrusion of one vehicle into another in a collision. ultimate strength: the maximum load-carrying capability of a structure, for a load applied at a specified location and direction. For further deformation of the structure, the load capable of being supported will be less than this maximum load. vehicle: a complete autonomous ready-to-run light rail vehicle orstreetcar thatcontains allthe minimumsystem requirements for operation, and that may have a coupler or drawbar at each end. The vehicle may be comprised of multiple carbody sections that are connected by artic- ulation joints and allow passage of passengers between sections while in service. vehicle vertical loads (a) ready-to-run: a vehicle that is service ready with all mounted components, including full operating reserves oflubricants, windshield fluid, etc., but without any crew or passenger load. (b) seated load: ready-to-run load plus the crew and all passenger seats occupied with average weight per person of 79.5 kg (175 lb). (c) car volume capacity load: a seated load plus all avail- able standee areas occupied with a standee density that results in a floor pressure of 488.4 kg/m 2 (100 lb/ft 2 ). NOTE: An alternate occupant weight based upon specific service conditions, such as service to airports and use of luggage racks, may be specified. yield strength: the stress value published by the American Society for Testing and Materials (ASTM) for the speci- fied material and grade. If the material used is not cov- ered by an ASTM specification or another specification, the minimum yield strength for design shall be as guar- anteed by the material supplier.

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