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ASME RT-2–2021 pdf download

ASME RT-2–2021 pdf download.Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles.
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated bythe experience gained from the application ofthe Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Interpretations. Upon request, the RTVStandards Committee will renderan interpretation ofanyrequirementofthe Standard.InterpretationscanonlyberenderedinresponsetoawrittenrequestsenttotheSecretaryoftheRTVStandards Committee. Requests for interpretation should preferably be submitted through the online Interpretation Submittal Form. The form is accessible athttp://go.asme.org/InterpretationRequest. Upon submittal ofthe form, the Inquirer will receive an automatic e-mail confirming receipt. If the Inquirer is unable to use the online form, he/she may mail the request to the Secretary of the RTV Standards Committee at the above address. The request for an interpretation should be clear and unambiguous. It is further rec- ommended that the Inquirer submit his/her request in the following format: Subject: Cite the applicable paragraph number(s) and the topic ofthe inquiry in one or two words. Edition: Cite the applicable edition ofthe Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation ofa specific requirement suitable for general understandingand use, notas a requestforan approval ofa proprietarydesign or situation. Please provide a condensedand precise question, composedin such awaythata “yes” or “no” reply is acceptable. Proposed Reply(ies): Provide a proposed reply(ies) in the form of “Yes” or “No,” with explanation as needed.
coupler system: a system comprised of the coupler head, drawbar, draft gear, and attachments to the carbody, permitting the connection between vehicles or trains. crash energy management(CEM): a method ofdesign 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 ofthe 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 ofa collision between trains or between trains and obsta- cles. end frame: structure inboard of the extreme ends of the vehicle that typically includes the corner posts, collision posts, or collision wall. 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. heavy rail transit vehicle: typically an electrically propelled, bidirectional vehicle, capable of multiple unitoperation,anddesignedforrapid,high-levelboarding and discharging ofpassengers. The vehicle is operated on amodeofrailrapidtransitgenerallycharacterizedbyfully grade-separated construction on exclusive rights of way, with station platforms at the floor level of the vehicles. These systems are commonly referred to as subways or metros. high-strength corner post: a structural post typically located at the extreme corners of the carbody, at the noncab ends of the leading and intermediate cars in a train, typically found in open gangway designs, replacing the need for collision posts, extending from the bottom of the underframe structure up to the level of the roof rail.
4 STRUCTURAL REQUIREMENTS Thecarbodyshallwithstandthemaximumloadsconsis- tent with the operational requirements and achieve the required service life under normal operating 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 strength of connections between structural members for all structural loading requirements outlined inTable4-1 shallexceedtheultimate load-carryingcapac- ityoftheweakestmemberjoined. Fortheseloadcases, the ultimate load-carrying capacity is defined by applying the load at the location and in the direction specified in Table 4-1 butincreased in magnitude to the maximum load that can be resisted by the structure, as determined by obser- ving that further increase in deflections will result in a decrease in the load capable ofbeing carried by the struc- ture. References to sheathing in Table 4-1 refer only to structurally related (load-carrying) sheathing.

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