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ASME RT-2-2014 pdf free

ASME RT-2-2014 pdf free.Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles.
This section covers geometric compatibility and crush mechanism design considerations for different vehicles operating on the same routes of the subject transit system.
3.1 AnticUmber and Coupler Interface
Each heavy rail transit vehicle shall incorporate an anticlimber at each end of the vehicle. The height and design of the anticlimber and coupler on new heavy rail transit vehicles shall be compatible with existing heavy rail transit vehicles that are operated on the same routes of the subject transit system. The anticlimber shall be designed for engagement between all vehicle types to mitigate telescoping in a collision, including any condihon of failed or deflated suspension elements. The coupler system shall be of a ‘shearback” design, to permit the couplers to collapse during a collision so as to allow engagement of the anticlimbers. See section 6 for additional requirements.
3.2 Multiple Unit Operation
All combinations of vehicles to be operated within a train shall be considered in assessing the effect of multiple unit operation in a collision.
The carbody shall withstand the maximum loads consistent with the operational requirements and achieve the required service life under normal operating conditions. The carbody 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 of the end frame for Items 6 through 11 in Table I shall exceed the ultimate load-carrying capacity of the weakest member joined. For these load cases, the ultimate load-carrying capacity is established by applying the load at the location and in the direction specified in Table 1 but increased in magnitude to the maximum load that can be resisted by the structure, as determined by observing that further increase in ddlections will result in a decrease in the load capable of being carried by the structure. References to sheathing in Table I refer only to structurally related (load carrying) sheathing.
4.1 Welding
Design of welded structures shall be in accordance with AWS D15.1, AWS Dl.l for steel, and AWS D1.2 for aluminum.
4.2 Design Parameter Tolerance
The allowable stresses for the loads specified in section 5 shall consider the limiting cases of dimensional tolerances, manufacturing processes, workmanship, and other man u ficturing conditions.
4.3 Demonstration of Strength and Structural Stability
It shall be demonstrated by analysis (section 9) and/or tests (section 10) that the requirements of section 5 are achieved.
4.4 Truck to Carbody Attachment
A mechanism for attaching the completely assembled truck, including the bolster if used, to the carbody shall be provided, with strength levels in accordance with section 5. The trucks shall remain attached to the car- body when the vehicle is raised unless first intentionally detached. The ultimate strength of the attachment mechanism in the horizontal plane (ultimate horizontal strength) shall be as specified to secure the entire truck to the carbody during collisions at any possible position of the truck in its vertical suspension travel. This shall include the condition of the vehicle raised off the track with the tnick hanging from the vehicle, and shall not depend upon external vertical loading nor upon bolster anchor rods.ASME RT-2 pdf free download.

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