LONGITUDINAL DEFORMATIONS OF SHORTENING OF STEEL-REINFORCED CONCRETE STRUCTURES UNDER COMPRESSION FROM SHORT-TERM LOADS
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Abstract
Determination and investigation of longitudinal deformations of shortening of steel-reinforced concrete structures is an important step in the calculation of complex spatial schemes of buildings. Ignoring these deformations can make it difficult to operate the facility and, in some cases, lead to the failure of adjacent structures. The study of longitudinal deformations of shortening of steel-reinforced concrete structures has not been given due attention before.
The longitudinal deformations of shortening for steel-reinforced concrete compressed elements using a large range of heavy concretes (from B25 to B80) and percentages of reinforcement (from 0 to 22%) are estimated. The deformations were calculated. The analysis of experimental data obtained during testing of conditionally centrally compressed models of columns of steel-reinforced concrete structures is presented. It is shown that the existing diagrams of concrete work do not accurately describe the work of a composite steel-reinforced concrete structure, it is its shortening and reduced rigidity. When the structure is compressed, concrete loses its destruction at earlier stages of loading than it would be for concrete or reinforced concrete. This fact is caused by the stress-strain state of the concrete section separated by steel elements, as well as the effects of early detachment and slippage along the «steel-concrete» contact surface. It is necessary to use a system of additional coefficients to eliminate the established discrepancy in determining the magnitude of longitudinal deformation (shortening) under the action of short-term loads and experimentally obtained data. These coefficients should increase the theoretical value of the expected relative deformations and consider the features of the work of conventional and high-strength concrete as part of compressible steel-reinforced concrete structures. When determining the stiffness values for steel-reinforced concrete structures under the action of short-term loads and bringing the calculated longitudinal stiffness to a value close to experimental data, it is proposed to introduce an additional coefficient. This coefficient further reduces the longitudinal rigidity of the structure depending on the stress level in concrete and steel.
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