On the Effect of Effort Regulation by Means of Temporary Continuityin Split Span Structures of Steelreinforced Concrete Bridges

Abstract

Abstract. The publication shows the effectiveness of applying the principle of temporary continuity by combining split span structures into acontinuous couplingusing a temporary joint. The method can be viewed as an option for effort regulation, creating abearing capacity reserveinload-bearing constructions within the span structures of bridges. The calculations provided show the effect on stress rate and bending moment in split span structurescombined into a double-spancontinuous coupling by a temporary joint.

Justification of the parameters of regulationof forces for steel-reinforced concrete span structures from project “43282 km” by TSNIIPSK

“…The authors of [8] noted a characteristic detail of the projects for the reconstruction of steel-reinforced concrete bridges, presented in the developments of the department "Bridges, Grounds and Foundations" of the TOGU, in which the key condition is the installation of temporary supports [8] under the last assembly joints in the span structures developed by TsNIIPSK "43282 km" project. This position of temporary supports divides the span into three parts of almost equal length.…”

“…Thus, favorable conditions are created for the relative freedom of maneuver of load-lifting mechanisms and vehicles necessary for the disassembling of sidewalk blocks, rail-ANALYSIS AND DESIGN OF BUILDING STRUCTURES ings, dismantling and removal of bridge deck clothes, dismantling of concrete of monolithic "windows", transverse and longitudinal seams of blocks of the passage slab and, accordingly, dismantling of existing road slab blocks. In connection with the peculiarity of the formation of the supporting structure of steel-reinforced concrete span structures, it is necessary to prevent the loss of stability of the bending-torsional form by solid-walled beams and to minimize the risks of this situation [8].…”

“…The order of work with the characteristics of technological operations and work of span structures, that satisfy the conditions of strength and stability of the flexural-torsional form and create the basis for regulating efforts in order to form a reserve of bearing capacity necessary to create a greater load capacity and a developed dimension of the carriageway and sidewalks, is presented. This, in turn, also makes the issue of developing a low-cost, efficient and safe technology for changing the passage slab on spans of steel-reinforced concrete bridges relevant [8]. For a substantive solution of the problem on the designated issue with reference to the stiffness characteristics of a particular span, the development of TsNIIPSK "43282 km" project was carried out (Figure 1).…”

“…Thus, taking into account the scope of work carried out in the sequence accompanying the formation of the bearing structure of the steel-reinforced concrete span structure, the deflection of the beam with a span of l = 42.12 m was assessed under the action of: the weight of metal structures, the weight of the reinforced concrete slab [9]. The composition of the loads, indications of the nature of the work of the section of the span beam are given in Table 1.…”