Published since 1923
DOI: 10.33622/0869-7019
Russian Science Citation Index (RSCI) Web of Science
  • Stress-Strain State Of Reinforced Concrete Beams When Changing The Force Sign
  • UDC 624.072.2:699.841
    doi: 10.33622/0869-7019.2023.02.44-52
    Sofia O. KURNAVINA,
    Ilya V. TSATSULIN,
    Moscow State University of Civil Engineering (National Research University), Yaroslavskoe shosse, 26, Moscow 129337, Russian Federation
    Abstract. In domestic regulatory documents on earthquake-resistant construction, the development of plastic deformations in structures under seismic influence is assumed. Their presence has a significant effect on the stress-strain state and bearing capacity of reinforced concrete elements when changing the force sign. This fact is neglected in the current regulatory documents. The results of experimental research of behavior of reinforced beams when changing the force sign are represented. Seven series of identical samples were tested. The samples of the first series were loaded by two monotonously increasing forces up to destruction. They were considered as reference The samples of the rest series were tested by two semi cycles of loading. In the first semi cycle the specimens were loaded until the specified coefficient of plasticity was reached. Then they were turned over and loaded according to the same scheme with a load of the opposite sign until destruction. The influence of plastic deformations of reinforcement on the stress-strain state of bent reinforced concrete elements under monotonous loading and change of the force sign was studied. Based on the results of the experiment, it was concluded that the strain diagrams along the height of the section can be approximated by a bilinear dependence both under monotonic loading and unloading. The nature of the dependence changes during loading. It is established that the maximum plastic deformations in the first half-cycle of loading significantly affect the stress-strain state, bearing capacity and the mechanism of destruction of beams when changing the sign of force. In this regard, there is a need to limit the maximum plastic deformations in seismic calculations of reinforced concrete structures.
    Keywords: alternating effects, plastic deformations, through cracks, stress-strain state, hypothesis of bilinear sections
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  • For citation: Kurnavina S. O., Tsatsulin I. V. Stress-strain State of Reinforced Concrete Beams When Changing the Force Sign. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering], 2023, no. 2, pp. 44-52. (In Russ.). doi: 10.33622/0869-7019.2023.02.44-52