This paper presents the structural behaviour of full-scale six-story, 2 by 2 bay concentrically braced steel building under seismic loading In this we have modelled three three-dimensional models and five two-dimensional frames with same material and section properties and dimensions. The main object is to study participation of braces and moment resisting frames in carrying storey shear. Each model is analysed using ETABS software and different parameters such as base shear, storey forces, displacement, storey shear and storey stiffness were compared and percentage storey shear carried by braces and moment resisting frames is obtained for frames with different types of bracings. The response of the building with different bracing configuration at different locations is represented in tables and graphs which will help to understand the behaviour of the concentrically braced steel building under seismic loading more accurately.