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Paper Details

Seismic Vulnerability Assessment of Steel Moment Resisting Frame due to Infill Masonry Walls, Variation in Column Size and Horizontal Buckling Restrained Braces

MagarPatilH.R, Jangid R.S

Journal Title:ACEE International Journal on Civil and Environmental Engineering

Steel moment resisting frame with open first storey (soft storey) is known to perform well compared with the RC frames during strong earthquake shaking. The presence of masonry infill wall influences the overall behavior of the structure when subjected to lateral forces, when masonry infill are considered to interact with their surrounding frames the lateral stiffness and lateral load carrying capacity of structure largely increase. In this paper, the seismic vulnerability of building with soft storey is shown with an example of G+10 three dimensional (3D) steel frame. The open first storey is an important functional requirement of almost all the urban multi-storey buildings, and hence, cannot be eliminated. Hence some special measures need to be adopted for this specific situation. The under-lying principle of any solution to this problem is in increasing the stiffnesss of the first storey such that the first storey stiffness is at least 50% as stiff as the second storey, i.e., soft first storeys are to be avoided, and providing adequate lateral strength in the first storey. In this paper, stiffness balancing is proposed between the first and second storey of a steel moment resisting frame building with open first storey and brick infills as described in models. A simple example building is analyzed by modeling it with nine different methods. The stiffness effect on the first storey is demonstrated through the lateral displacement profile of the building.