Efficient construction of the motorway and highway bridge superstructure (experimental studies)
MATEC Web of Conferences
The design of the span structure of the bridge was presented. Its structure was formed by the creation of a composite steel and concrete element consisting spatial steel perforated boxlike-section blocks, a system of shear links of a special type and a monolithic reinforced concrete slab containing inside emptiness-formers The novelty of the design and methods of its creation predetermined the need for experimental testing. It was implemented in full-scale conditions and had, in addition to
... arch, acceptance nature. In this connection, the article presents the results of tests of the composite steel and concrete structure of the superstructure of the bridge over Sukhoy Torets in Barvenkovo. The nature of its deformation under the static and dynamic loads is shown. During the tests, the components of the stress-strain state were determined at the distinguished points of the structure, fixed under static load. The amplitude and frequency response of the bridge unit were established for various dynamic impact options. Based on the obtained data, the structural resistance features under load impacts was analyzed, the design model of the bridge was verified, and the compliance of the accepted design parameters with the limitations of the applicable reference documents was confirmed. Maximum relative deformation value 1•10 -4 mm corresponds to the stress value of 250 kg/cm 2 . The error in comparison of the experimental and theoretical stress values was 5-10%. Dynamic test data During the dynamic part of testing, amplitude frequency response (AFR) of the superstructure unit under different dynamic impacts were obtained. The diagram describing the dependence of amplitudes from the self-induced vibration frequencies is shown in Figure 20 .