ASME RT-2:2021 pdf free download

ASME RT-2:2021 pdf free download.Safety Standard for Structural Requirements for Heavy Rail Transit Vehicles.
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 truck hanging from the vehicle and shall not depend upon external vertical constraints nor upon bolster anchor rods.
4.6 CoLLision and Corner Posts
Collision posts are required in end frames to protect the occupants at the end of the train, normally a cab end, from the severity of a collision with another train. For Intermediate carbody ends between like vehicles and not designed for configuration at the ends of a train, the function of a collision post maybe relocated to the corner of the end frame to become a high-strength corner post. The design of the high-strength corner post shall include features that prevent anticlimbing. provide strength resistance against override, and exhibit a distributed load transfer into the car structure along its length, including the roof level end-frame to end-frame reaction at the roof to side frame structural connection.
4.7 CoLLision WaLL
A collision wall may be substituted for collision posts provided it meets all of the same performance requirements as required in Table 4-1, Items S through 7. For intermediate carbody ends between like vehicles and not designed for configuration at the ends of a train, the function of a collision wall may be relocated to the corner of the end frame with strength equivalent to a high-strength corner post.
4.8 Open Gangways
For heavy rail vehicles using an open gangway design, the open gangway as defined provides passage width between cars that prevents the common location of collision posts by the nature of its design. As a result, the side corner posts at open gangway-equipped ends require higher strength criteria to provide the necessary passenger protection and loading resulting from collision events.
Open gangways are only located in the middle of the train and are not subjected to high acceleration loading seen by leading cab cars. Therefore, the longitudinal load requirements for the high-strength corner posts are lower than for the cab end collision posts.
Gangways between vehicles constituting flexible connections are excluded from the global vehicle shortening requirements of para. 9.3.
In the event of a collision, according to the scenarios defined in this Standard, the following criteria apply:
(a) The open gangway attachment points to the carbody end frame shall comply with Table 4-1, Item 20.
(b) The open gangway attachments shall withstand all forces imparted by the open gangway, including those resulting from negotiating all applicable track conditions on the system, loads from jacking, and lifting.
(c) The open gangway attachments shall withstand the carbody volume capacity load.
(d) The gangway system shall not prevent the design function of a drawbar coupler, energy absorber elements, or anticlimbers. The minimum length of compressed gangway components shall be taken into account.