STRENGTHENING OF REINFORCED CONCRETE STRUCTURES WITH EXTERNAL STEEL SHEAR WALLS

In recent decades the goal of building rehabilitation and strengthening has gained research attention and numerous techniques have been developed to achieve this, as a number of buildings are damaged in earthquake prone regions or strengthening of an undamaged structure is made necessary by revisions in structural design or loading codes of practice. Most of the strengthening strategies may be carried out on a global basis by adding extra load-resisting elements such as steel frames or steel braces to the structure or it can be performed on a local basis by retrofitting the existing structural elements. In this report, a new strengthening alternative for reinforced concrete (RC) structures, namely exterior steel shear wall is discussed. Use of shear wall is a global external strengthening technique which offers advantages with respect to cost and ease of construction. Installing the shear wall will surely improve the seismic capacity and hence sway stiffness of RC structures. The perceived advantages of steel shear walls in seismic resistant structures are enhanced stiffness, strength and ductility, stable hysteresis characteristics and a large capacity for plastic energy absorption .They are also much lighter than equivalent reinforced concrete shear walls, thus reducing the dynamic forces and loads on the foundation.The advantages of using steel plate shear wall compared to other retrofiiting methods; seismic resistance of steel plate shear walls; addition of shear walls to existing structures and its connections; behaviour of building frames with steel plate shear walls; and modification of properties like base shear capacity, displacements, damages etc are discussed. Results of experimental investigations conducted on models strengthened using shear wall is also included.

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