Strength and deformability of externally strenghened reinforced concrete beams

Authors

  • M. G. Chekanovich Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukrain, Ukraine
  • S. N. Romanenko Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukraine, Ukraine
  • Y. P. Andrievska Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukraine, Ukraine

Keywords:

external reinforcement, cross-section, stress, strain, strength.

Abstract

Abstract.  Purpose.  The main objective was to determine experimentally the parameters of strength and stress  -  strain state of reinforced concrete beams reinforced with a new system of external tension members.  Methodology. We consider the self-regulated, simple and reliable design of the new beams, which effectively enhanced by the action of an externalload on it through the rational redistribution  of  stresses  between  the  compressed  and  stretched  zones.  In  this  amplification  system  comprises  flexible  elements which  operate  in  tension.  The  proposed  design  solution  adjustable-intense  beam  that  contains  a  reinforced  concrete  body  and tightness, fixed at both ends on the beam cooperating in the middle of a tension element, which rests on the lower face of the beam, and a transverse outer armature cooperating in near the support zones beam with the top and bottom of its facets and a middle portion engaged with tightening. Transverse reinforcement stretched, flexible, and mirror symmetrically located in areas near the support beams inclined to the longitudinal axis of the beam. Transverse reinforcement beam fixed at one end on the upper face of the beam closer to its center with limited displacement towards the middle, and at the other end on the lower edge of the beam closer to its supports restricted displacement to the supports and longitudinally stretching the upper face of thebeam and compressing the bottom thereof faces near the support compression and transverse zones. In the middle of the transverse reinforcement interacts with the tightening.  Findings.  The experimental study of strength and deformability of normal and reinforced concrete beams and girders, reinforced  longitudinal-transverse external system;  the  results  obtained  after the  experimental studies are not  ordinary  reinforced concrete beams and girders, reinforced longitudinal- transverse external system; the comparison of experimental results; determine the  effectiveness  of  strengthening  reinforced  concrete  beams  longitudinal-transverse  external  system  rebar.The  results  of experimental comparisons of the work load of bent reinforced concrete elements of self-regulation tightening with the conventional reinforced concrete beam.  Originality.  After tests it was found that reinforced beam  БПС-ІІ  withstood a load of 1,24 times greater and БПП-ІІ  beam withstood a load of 1,16 times more than a regular bar. This reinforced beams were tougher for ordinary beam.

Author Biographies

M. G. Chekanovich, Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukrain

Ph.D., professor

S. N. Romanenko, Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukraine

post-graduate student

Y. P. Andrievska, Department of building, Kherson State Agricultural University, Str. Rosa Luxemburg, 23, 73006, Kherson, Ukraine

post-graduate student

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Published

2016-02-23

Issue

Section

Creating of high-tech ecological complexes of Ukraine based on the concept of balance (stable) development