The present invention applies to a bridge structure for road bridges including a beam (1) composed of two types of concrete parts laid alternatively with pre-stressing rods placed in a cable in their centre allowing for continuous changes of the pre-stressing force according to the external load intensity. The bridge structure (1 ) for road bridges comprising a bridge beam consisting of at least one row of nine parts (2), (3), (4) arranged sidewise where the end parts (4) of full cross section are supported from the bottom with a strut (10) and both end parts (4) are provided with an anchor (9) with pre-stressed ropes (6) of a cable passing through across the full length of the beam (1).The bridge beam (1) consisting of at least one row of nine parts (2), (3), (4) arranged sidewise. The beam (1) comprises five parts (2) of full cross section in trapezoidal shape extending downwards and four parts (3) lightened in their cross section and forming a bottom-open frame of trapezoidal shape extending downwards, where the beam (1) is symmetrical around its centre with the individual part types (2), (3), (4) arranged symmetrically from the centre towards the sides.
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