Building structures effective design should ensure uniform strength of all building load-bearing elements. Steel-reinforced concrete structures are made both during new construction and during the reconstruction of buildings or structures by a successful combination of steel, mainly rod elements, and monolithic concrete. Quite often, in order to increase the manufacturability of such floors installing and reduce the construction time, a monolithic reinforced concrete slab is arranged on a fixed formwork made of profiled flooring. To include a profiled sheet in compatible work with a monolithic slab, anchoring means are provided: protrusions on the sheets surface, rod reinforcement, etc. However, due to the usually equal pitch of the profiled sheets (steel beams) supports, they are unevenly stressed. On the basis of the conducted theoretical analysis, 6 slabs 6 m long, 1.06 m wide and 0.53 m made of K35-0.5 steel profiled flooring were designed, manufactured and tested according to a continuous three-span scheme, as a fixed formwork for monolithic steel-reinforced concrete floors. The samples were loaded with bricks. To measure deflections during sample loading, watch-type indicators with a division value of 0.01 mm were used. To measure strain electro tensile resistors were used. An analysis of supports installation variable step influence, as one of the methods of these floors load-bearing capacity use level balancing was carried out. It has been experimentally confirmed that when equalizing the values of the span or support bending moments (at the same time, the support moments are twice as large as the span), as well as deflections, the lengths of the extreme spans should be 25% less than the central spans.

steel-reinforced concrete floor, fixed formwork, profiled flooring, force adjustment

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