Abstract
In order to significantly reduce the weight of flat monolithic reinforced concrete floors, foundations, and other slab structures, construction operations have increasingly involved effective inserts as the separate articles made from relatively light and cheap materials that are placed in the midsection and left in the slabs after concreting.The inserts made from relatively light and cheap materials, with respect to concrete, have the strength and rigidity that are orders of magnitude less and are essentially used to form hollows. The inserts considered in this paper are prismatic. When the inserts are arranged in two directions, which is typical for most slab structures, we obtain the I-sections, whose calculation involved the analysis of the impact exerted by the general and local strength factors. Under such conditions, slabs must be calculated taking into consideration the biaxial work of concrete. In this paper, we have examined the stressed-strained state of the slab reinforced concrete structures with a bidirectional location of inserts and have substantiated the estimation schemes and calculation dependences related to the procedure for calculating the floors and other slab reinforced concrete structures with a bidirectional location of inserts. The paper gives an example of the calculation of a monolithic flooring slab based on the proposed procedure, which demonstrated that accounting for the biaxial stressed-strained state of concrete significantly increases the strength of concrete and the rigidity of a flooring slab, by 19.3 %.Thus, the consideration of biaxial compression of concrete is an important factor in the design of slab structures with a bidirectional arrangement of inserts
Highlights
IntroductionConstruction operations have increasingly exploited monolithic reinforced concrete floors and other slab structures with effective inserts whose application yields a signi ficant reduction in the natural weight of slabs, thereby saving concrete and reinforcement fittings [1]
Construction operations have increasingly exploited monolithic reinforced concrete floors and other slab structures with effective inserts whose application yields a signi ficant reduction in the natural weight of slabs, thereby saving concrete and reinforcement fittings [1].While the plastic inserts of various shapes are mainly used abroad, operations in Ukraine involve prismatic polystyrene inserts that have the one-way or two-way arrangement of inserts.Under conditions of arranging the inserts in both directions, which is characteristic of most slab structures, it is necessary to take into consideration the biaxial stressed-Applied mechanics strained state of concrete; the current calculation procedures do not account for it
Our analysis of the literary sources allows one to conclude that there are neither justified estimation schemes nor analysis of the stressed-strained state, which could be used to calculate slab structures with a bidirectional arrangement of inserts considering the biaxial work of concrete
Summary
Construction operations have increasingly exploited monolithic reinforced concrete floors and other slab structures with effective inserts whose application yields a signi ficant reduction in the natural weight of slabs, thereby saving concrete and reinforcement fittings [1]. While the plastic inserts of various shapes are mainly used abroad, operations in Ukraine involve prismatic polystyrene inserts that have the one-way (one direction) or two-way arrangement of inserts. Under conditions of arranging the inserts in both directions, which is characteristic of most slab structures, it is necessary to take into consideration the biaxial stressed-. Applied mechanics strained state of concrete; the current calculation procedures do not account for it
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