The present master thesis discusses the performance of modular unit ceiling corner under flexural load. For this reason a numerical model was developed in the program Abaqus as well as verified with experimental tests, performed at the Slovenian National Building and Civil Engineering Institute (ZAG). Test samples were loaded with axial force as well as vertical force at the end of the profile, causing bending moment in the ceiling corner. A single-axe tensile test was also made for the needs of numeric analysis, where actual tensile strengths of steel S235JR, S355JR and S355MC were used in the test samples. On the basis of the developed numeric model a parametric analysis was performed, testing the influence compressive load level has on the bending performance of modular unit corner. By using various means to intensify ceiling corner, its load capacity and stiffness have been improved. The final part of the thesis presents the allocation of forces in screws and the influence of additional switch tin plates on the load capacity of bolting joint. It has been proven that the actual allocation is quite different to its constructed value.