Featured　Application　A　bolt-compression　steel　plate　(BCSP)　system　is　usually　used　for　strengthening　the　flexural　performance　and　improving　the　failure　mode　of　over-reinforced　beams　and　may　easily　be　employed　in　normal　design　applications.　This　method　is　applicable　for　protecting　sections　against　further　deterioration　and　for　strengthening.　This　method　provides　an　economical　solution　for　the　retrofitting　or　rehabilitation　of　structures,　regardless　of　their　elements.　This　study　presents　an　experimental　investigation　and　finite　element　modelling　(FEM)　of　the　behavior　of　over-reinforced　simply-supported　beams　developed　under　compression　with　a　bolt-compression　steel　plate　(BCSP)　system.　This　study　aims　to　avoid　brittle　failure　in　the　compression　zone　by　improving　the　strength,　strain,　and　energy　absorption　(EA)　of　the　over-reinforced　beam.　The　experimental　program　consists　of　a　control　beam　(CB)　and　three　BCSP　beams.　With　a　fixed　steel　plate　length　of　1100　mm,　the　thicknesses　of　the　steel　plates　vary　at　the　top　section.　The　adopted　plate　thicknesses　were　6　mm,　10　mm,　and　15　mm,　denoted　as　BCSP-6,　BCSP-10,　and　BCSP-15,　respectively.　The　bolt　arrangement　was　used　to　implement　the　bonding　behavior　between　the　concrete　and　the　steel　plate　when　casting.　These　plates　were　tested　under　flexural-static　loading　(four-point　bending).　The　load-deflection　and　EA　of　the　beams　were　determined　experimentally.　It　was　observed　that　the　load　capacity　of　the　BCSP　beams　was　improved　by　an　increase　in　plate　thickness.　The　increase　in　load　capacity　ranged　from　73.7%　to　149%　of　the　load　capacity　of　the　control　beam.　The　EA　was　improved　up　to　about　247.5%　in　comparison　with　the　control　beam.　There　was　also　an　improvement　in　the　crack　patterns　and　failure　modes.　It　was　concluded　that　the　developed　system　has　a　great　effect　on　the　parameters　studied.　Moreover,　the　prediction　of　the　concrete　failure　characteristics　by　the　FE　models,　using　the　ABAQUS　software　package,　was　comparable　with　the　values　determined　via　the　experimental　procedures.　Hence,　the　FE　models　were　proven　to　accurately　predict　the　concrete　failure　characteristics.