прогин

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.

The paper presents only some problems of design and constraction of the bridge. 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 active provides the results of experimental reseach abtain in investigation of the testing multi – span prestresset rein reinforced reinforced concrete bridges.

Тechnique and results of static tests of reinforced concrete without-diaphragm span structure before and after reconstruction are described.

The influence of the additive “Penetron Admix” on the coefficient of concrete technological damage is represented, as well as on the deformation of the arches during uploading a single short-term load.

The influence of the concentrated force position (in the middle of the span and eccentricity) on the deformation of reinforced concrete arches loaded single short-term load is represented.

The active provides the results of experimental reseach abtain in investigation of the testing multi – span prestresset reinforced concrete bridges. For the first time in the laboratory conditions were held experimental researches of prefabricated monolithic precast spans to check accepted methods of calculating the direct determination of efforts elements during the action of static load. Tests showed sufficient stiffness and strength of prefabricated monolithic spans working in an elastic phase, almost in the estimated load.