RESPONCE OF R.C BEAMS UNDER EXTERNAL ECCENTRIC COMPRESSION FORCE

Some methods and techniques for strengthening of R. C. beams were used in the present
years. These methods aimed to increase the ultimate strength capacity, decrease the elastic
deformations, increase the structure safety, and serviceability.
The aim of this present study is to investigate the response of R. C. beams strengthened using
external eccentric compression force.
In this investigation ten beams were studied, one reference and another nine beams were
divided into three groups (1, 2, and 3). Each group contains three beams. The main
investigated parameters are the magnitude and different eccentric ratios of external forces.
The magnitude was taken constant in each group, which equals to (2.0, 2.5 and 3.0) tons for
groups (1, 2, and, 3) respectively. While the eccentricity equals to (.025, 0.05, and, 0.075)
meters for each beam in each group respectively.
Deflection under load, mid-span, longitudinal tensile, compressive deformations about mid
span, and initial cracking loads were recorded for each beam during loading up to till failure.
The ultimate loads were recorded as well as modes of failure. Comparison between the tested
and calculated results were considered and discussed to achieve the best recommendations.
The tested results indicated the efficiency of these technique of the strengthened investigated
in this research, suitability, cheaper, quickly and the simplicity for applications.