Beam-column joints("BCJ")are critical members in low-rise to mid-rise buildings.Failure of BCJ may lead to collapse of building.As a result,many methods have been proposed to strengthen non-seismically designed BCJ.Recently,a comprehensive study has been commissioned with the objective to develop a strengthening strategy for BCJ using chamfers.Specifically,chamfers are proposed to be installed at beam-column corners and under the soffit to alleviate the undesirable joint-shear failure.This study comprises both experiments and numerical simulations.Tests were carried out on four 2/3-scale BCJ,comprising one control specimen and three strengthened specimens.They were subjected to moderate level of axial load and were loaded to failure under quasi-static cyclic loading.Parameters to be considered included chamfers with and without reinforcements and size of chamfers.It has been shown that chamfers are effective to protect a non-seismically designed BCJ against failure at joint core.Mode of failure is shifted from joint-shear in the control specimen to column-flexure in the strengthened specimens.To enhance the performance of BCJ,size of chamfer is more crucial in comparison with reinforcements in chamfers.WCOMD,a non-linear finite element programme for 2-dimensional reinforced concrete structures,was used to perform the numerical simulation.It is based on smeared model with incorporation of elasto-plastic fracture mechanics for concrete,tension stiffening/softening and taking into account the effect of cracking.Hysteresis behaviours of the specimens as per predicted by WCOMD are in close agreement with the test data obtained from the experiments.Strain in chamfers ranges from-750 micron to 500 micron,regardless of the provision of reinforcements.This confirms that the effect of chamfers is mainly affected by size of chamfers.Joint-shear failure is effectively suppressed by chamfers as evidenced by limited cracking and low strain concentration inside chamfers.