Introduction. Brief information on manufacturers of metal corrugated structures in Ukraine and abroad is presented. Examples of transport structures made of metal corrugated structures (MCS) are presented. The necessity of improvement of the regulatory base of Ukraine as for calculation, inspection and testing of transport constructions made of metal corrugated structures is substantiated.
Problem statement. Experience in operating corrugated metal structures indicates that, in some cases, they do not have a standardized service life, which should correspond to the design durability. When operating, constructions with MCSs are prone to the formation of residual deformations in structure cross-section, which affects their bearing capacity. In order to prevent these damages, it is necessary to carry out inspections and testing of such transport facilities. This, in turn, requires the development of reliable analytical methods for assessing the load-bearing capacity of transport constructions made of corrugated metal structures when interacting with soil compaction backfill, and the improvement of experimental methods for these structure testing for static and dynamic loads.
Purpose. The purpose of the work is to develop analytical and experimental methods for assessing the load-bearing capacity of a transport structure made of metal corrugated structures, which is operated in the body of a highway embankment, during its examination and testing.
Results. The program of inspection and testing of a tunnel underpass made of metal corrugated structures on the highways of Ukraine is offered. The analytical method of estimation of load-bearing capacity of metal corrugated structures of an underpass under the influence of static loads from motor vehicles is presented, and the stress distribution in the structures at different combinations of tunnel underpass loading is obtained. The load-bearing capacity of metal corrugated structures was evaluated by the finite element method. The technique of experimental testing of a tunnel underpass made of corrugated metal structures is offered and full-scale experimental tests of an underpass for static loads are conducted.
Conclusions. The difference between the stresses obtained by loading the underpass with one and four dump trucks is up to 15 %, which leads to the conclusion that the load distribution angle is less than 45 degrees. Therefore, such structures can be used under multi-lane highways or multi-lane railways, provided that the height of the soil backfill is greater than 2.0 m. The reserve capacity of the tunnel underpass is 80 %.