The paper presents only some problems of design and constraction of the bridge. The aim of the experimental study is to establish the behavior peculiarities of multi-span structure under the external static loading. The development of structure calculation methods for multispan reinforced concrete while taking into count the stages of its work is necessary to increase the effectiveness and widespread use of it. Improvement of structure calculation methods is an important problem. One of the main advantages of multi-span reinforced concrete structures is ability to simply create beam structures of static-indefinite systems with prestressed multispan and suppressed reinforcement. With its use, it is possible to adjust the stress both while structures. The program of static testing, the design schemes of testing loading and the devices for displacement and relative deformations measuring are proposed. Experimental-theoretical studies of prefabricated monolithic reinforced concrete pre-stressed beams of 18 m length were performed to study the load-carrying capacity, stiffness and cracking strength of the prefabricated elements at different stages of work at the installation stage of locking and comparing the data obtained with the calculations. The active provides the results of the research out composite muilti-span prestressed reinforced concrete beam for time building bridges. Comparison of experimental and theoretical sizes. Values of crack resisting, deformation property and strength index are received, work stages and studied slabe collapse odes are also described. The characteristic stage of the tensely deformed state are selected. State and practic making of multi-span iron concrete constractions by high productive modern technology. The analysis of the got results of experimental research is executed. The investigation of the large-scale bridge structure with bringing them to failure, thus avoiding the scale factor effect, is very important. Improving methods for calculation will provide the lower expence of materials when designing rainforced concred strutuctes and allow more efficient using all elements that make the constraction.

1. Holyshev A. B., Polyshchuk V. P., Sunhatulyn Ya. H. (1975), Proektirovanie i izgotovlenie sbornomonolitnyh konstrukcij. [Designing and manufacturing of prefabricated monolithic structures], Budivel'nyk, Kiev, 215 p. [in Russian]

2. A. B. Holyshev. (1982), Proektirovanie i izgotovlenie sbornomonolitnyh konstrukcij. [Designing and manufacturing of prefabricated monolithic structures], Budivel'nyk, Kiev, 152 p. [in Russian]

3. Rukovodstvo po proektyrovanyyu zhelezobetonnykh sbornomonolytnykh konstruktsiy. [Manual for the design of reinforced concrete monolithic structures], (1977), Stroyizdat, Moskva, 59 p. [in Russian]

4. Sunhatulyn Ya. H. Osobennosti rascheta sborno-monolitnyh zhelezobetonnyh konstrukcij po pervoj gruppe predel'nyh sostojanij. [Features of compilation of monolithic reinforced concrete structures in the first group of limiting states], (1983), Kazan', 44 p. [in Russian]

5. Pytul'ko S. M. (1972), Issledovanie treshhinostojkosti i deformativnosti izgibaemyh sbornomonolitnyh konstrukcij pri kratkovremennom i dlitel'nom dejstvii zagruzki: avtoref. dyss. kand. tekhn. nauk. [Investigation of crack-resistance and deformability of bendable monolithic structures with shortterm and long-term loading action: Author’s thesis], Moskva, 21 p. [in Russian]

6. Polyshchuk V. P. (1982), Raschet sborno-monolitnyh konstrukcij na obrazovanie normal'nih treshhin s uchetom neuprugih deformacij, Beton y zhelezobeton, No. 3, pp. 40–41. [in Russian]

7. Salo V. Ju., Gnidec B. G. (1986), Issledovanie obrazovanija naklonnyh treshhin v naturnih mostovih konstrukcijah s dvuznachnoj jepjuroj momentov, Vestn. L'vov. politekhn. in-ta, No. 213, pp. 74–76. [in Russian]

8. Gnidec B. G., Salo V. Ju. (1987), Sovershensvovanie konstruktivno-tehnologicheskih reshenij sborno-monolitnyh nerazreznyh proletnyh stroenij mostov, Trudy SoyuzdorNII, Moskva, pp. 28–34. [in Russian]

9. Mosty` i truby`.Pravy`la proektuvannya [Bridges and pipes. Design rules]. (2006). DBN V.2.3-14:2006. Ky`yiv: Building norms of Ukraine [in Ukrainian].

10. Sporudy` transportu. Mosty` ta truby`. Osnovni vy`mogy` proektuvannya. [Constructions of transport. Bridges and pipes. Basic design requirements]. (2009). DBN V. 2.3-22:2009. Ky`yiv: Building norms of Ukraine [in Ukrainian].