bending moments

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.

A quasistatic problem of thermoelasticity for a yielding cylindrical finite-length shell under the action of axially symmetric heat sources in a wide range of heating modes is solved. The numerical calculation of the temperature fields, the ring forces and the bending moments for the values of the time at which they reach the maximal levels is carried out. The influence of the shear degree is studied.

The active provides the results of experimental reseach abtain in investigation of the testing multi – span prestresset rein reinforced reinforced concrete bridges.

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.