Abstract
The study object is a prototype of a composite bridge prestressed concrete beam with a length of 42.0 m for road bridge desks for perception of impact from motor vehicles in the form of A14, NK-120 and NK-180 loads.
 The experimental deflection of the beam in the midspan had a value equal to fexp = 62.4 mm at a load of 2Pк = 436 kN, which was 75.2% of the control deflection value.
 Based on the test results, the girder block joints with "tooth" and "notch" device are found to be imperfect.
 The experimental load of 2PMAX = 822.7 kN was achieved during the tests, which exceeded the control load equal to 2Pк = 744 kN when checking the strength of the composite beam and the control load equal to 2Pк = 790 kN when checking the strength of No. 1 and No. 2 joints.
Highlights
The prototype of a composite beam consists of three segments - two outer and one middle (Figures 1, 2, 3)
The composite beam blocks have a T-section with a widened part at the bottom in the transverse profile to place prestressing tendons
Six tendons have been adopted when reinforcing the composite beam with prestressing tendons, where each tendon consists of seven K-7 strands
Summary
The prototype of a composite beam consists of three segments - two outer and one middle (Figures 1, 2, 3). The length of the outer blocks is 14000 mm each. The middle segment has the shape of inverted trapezoid - the block has a length of 14010 mm at the top and 14000 mm at the bottom. The composite beam blocks have a T-section with a widened part at the bottom in the transverse profile to place prestressing tendons. The concrete strength class of the beam blocks is adopted B40 in accordance with the project. Six tendons have been adopted when reinforcing the composite beam with prestressing tendons, where each tendon consists of seven K-7 strands. The controlled force due to prestressing was assumed to be equal to 1292 kN in accordance with the project
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