In the thesis theoretical and experimental researches of bridge deck slabs, reinforced by corrugated steel decking, are considered. Corrugated steel decking on construction stage plays role of non-removable formwork; on exploitation stage (with some structural requirements observance) it can be included in joint work with concrete slab as external reinforcement.
Thesis was performed for the development purpose of effective structures of bridge deck slabs with corrugated steel decking. Determination the parameters of strength, crack resistance and deformability, development of such structures calculation method were provided. To accomplish this goal were resolved such tasks as: new structures of bridge deck slabs with corrugated steel decking development; new ways of decking fixing and anchoring development; strength, crack resistance, deformability and durability of bridge deck slabs with different anchoring of corrugated steel decking under static and repetitive loads were examined; calculation method by limit states of bridge deck slabs with corrugated steel decking under static and high-level lowcycle loads was designed; calculation method of bridge deck slabs with corrugated steel decking durability was designed.
In thesis information on monolithic concrete structures in non-removable formwork historical development is presented; analysis of design experience, engineering and research of composite steel-concrete structures, ways of joint work ensuring of external reinforcement and concrete slabs is carried out. By results of the literature overview author formulated the goal of work and made a number of conclusions that determined the future direction of work.
As the result of analytical studies of monolithic concrete slabs with corrugated steel decking author proposed a number of constructive and technological solutions of the design and manufacturing of monolithic slabs with corrugated steel decking, and methods of fixation and anchoring of steel decking in monolithic concrete slabs. 4 proposals received patents for utility model, 2 - patents for invention.
For experimental researches of monolithic concrete slabs with corrugated steel decking were designed and manufactured 6 series of test samples (models of natural bridge deck slab fragments), reinforced by corrugated steel decking with different bearing and span anchoring conditions. Samples were tested under static, low-cycle and repetitive loads with usage of classical methods of deformation measurement, electrotensometry method, digital-optical microscopy method, digital image correlation method. The author has been obtained experimental data about strength, crack resistance, deformability and durability of bridge deck slabs with different anchoring of corrugated steel decking under static and repetitive loads, coefficients of working conditions for new types of decking anchoring were determined.
Data obtained from experiments helped author to create calculation method by limit states of bridge deck slabs with corrugated steel decking under static, lowcycle and repetitive loads; author improved the analytical deflection determination methodic, which takes into account the impact on deflections of applied bearing and span anchoring of steel decking. Comparison of the results, obtained in the experimental studies, with the results of calculations is made and conclusion about their good convergence was made.
Practical application of corrugated steel decking as bridge deck slab's permanent formwork was made – information about bridge's tests is given, the results of which were used in creating of the span structure's finite-element model. This model was used to determine the efforts in deck slab and for performing of comparative calculations of deck slab's strength without steel decking and with decking as reinforcing element with different anchoring conditions and decking's thickness. The analysis of technical and economic effectiveness indicates that the costs of steel decking application as non-removable formwork is lower than the cost of removable formworks appliance, and it does not change with increasing of bridge height.
