ASME RT-1-2020 pdf download
ASME RT-1-2020 pdf download.Safety Standard for Structural Requirements for Light Rail Vehicles and Streetcars.
This Standard relies, where practical, on terms already inusebyASME, the AmericanPublicTransportationAsso- ciation (APTA), and the Institute ofElectrical and Electro- nics Engineers (IEEE). For the purposes ofthis Standard, the following definitions apply: anticlimber: a structural memberormechanism located at eachendofthevehicleusedtoengageanopposingvehicle, coupled or not, to resist relative vertical travel between the two carbodies during a collision. articulation: a rotating connection at the intermediate ends of carbody sections to allow negotiation of tracks with various vertical and horizontal profiles. average collision acceleration: the longitudinal accelera- tion of each car-module of the vehicle computed using a 100 ms simple moving average over the duration of the collision event and averaged over each car-module. beltrail: a longitudinal structural member ofthe carbody located on each side of the carbody below the passenger side windows. The distance between opposite belt rails often establishes the overall width of the carbody, exclu- siveofthesidedoorthresholds,sidecameras,andmirrors. carbody: the car-module 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. car-module: a fully assembled vehicle section that spans between couplers, articulating joints, or a coupler and an articulation. Amodulemaybesupportedbyatruckormay be suspended between two articulations without a truck. collision posts: a setoftwo structural posts located ateach end of the carbody, extending from the bottom of the underframe structure up to the structural shelf. Collision posts may be made of several structural members assembled to each other, provided that the required performance is met.
endsillcompression load(buffload):longitudinalcompres- sive 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. lightrailvehicle (LRV): vehicle thatoperates on a lightrail transit system and is not part ofmainline 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 transitcharacterized by its ability to operate on exclusive rights-of-way, shared street running, and through roadway grade crossings (see also streetcar). 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 and 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 car-modules.
In case ofcollision, interior equipmentinterfacing with occupants that may become loose within the occupied volume shall be securely fastened. An analysis shall be provided for such interior equipment that weighs over 11.3 kg (25 lb) (e.g., display panels, seats, fire extin- guishers, luggage stowage racks) excluding the interior liners such as side and end walls, door pockets, ceiling-lining materials, and floors. All other equipment attached to the carbody (interior equipment not interfa- cing with occupants and exterior equipment) weighing over67.8 kg(150 lb) shall be analyzed. Equipmentattach- ments shall be ofsufficientstrength to supportequipment underloadingandacceptancecriteriaspecifiedbyItem14 in Tables 4-1 and 4-2. Equipment housed within a fixed compartment need not be analyzed provided it can be shown that contained equipmentwill notpenetrate the walls ofa fixed compart- ment when exposed to the specified acceleration loads in Item 14 in Tables 4-1 and 4-2. For any portion of the proposed design that is based on a service-proven vehicle, data from previous tests, historical data from operations or structural analyses as required to satisfy the applicable requirements may be provided in lieu of new analyses or tests. 9.1 Structural Illustrations Structural illustrations shall be provided to clearly define the primarycarbodystructure. The structural illus- trations shall include a side view, a top view showing one longitudinalhalfoftheroofandonelongitudinalhalfofthe underframe, and typical carbody cross-sections, which may include side-frame and doorframe posts; end, side, draft, and centersills; beltrail, top, and roofrails; collision andcornerposts; bolsters, floorbeams, and cross bearers; roof carlines and purlins; roof sheathing or corrugation; and side-frame sheathing and/or corrugation.
