engleski

Analysis of tram induced vibration influence on underground garage structure through exploitation

Light rail traffic presents significant advantages in a heavy populated urban environment in terms of quality of service, volume of passengers, delays etc. Railway vehicles in interaction with a railway structure, however, can induce vibrations that are propagating to surrounding structures. In a crowded urban environment, underground structures such as underpasses, garages or water supply and sewage facilities are often located directly under the rail track structures. In such scenarios, special attention has to be pointed to track design in terms of vibration attenuation, as well as underground structure design in respect to additional dynamical loads presented by the overhead rail traffic. The paper presents a case-study of vibration measurement and analysis on an underground garage constructed under a tramway line on Kvaternik square in Zagreb. Since three tramway routes intersect at the square, turnouts and crossings are also present. Rail discontinuities at turnouts present an impact point between tram vehicles and the track and therefore induce severe vibrations. To analyse tram induced vibrations and its effects on an underground garage structure, measurements on several locations have been conducted, including square surface and underground garage slab structures. Measurements have been conducted immediately after the construction of the garage and tram track on top of it, and repeated after 6 years of exploitation, using same principles and under same traffic load. This way the influence of exploitation wear and aging could be evaluated and analysed. Additionally, rail geometry at turnouts has also been observed on order to correlate the rail wear and measured vibrations. Such approach gives a good insight in behaviour of slab track structures built on top of another rigid structure, as well as the behaviour of underground reinforced concrete structures subjected to dynamic loads.

vibracije; podzemna garaža; tramvajski kolosijek; interakcija

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