Retrofitting of Structure for Seismic Force Using Post Tensioning of RC Shear Wall

In the seismic design of buildings, reinforced concrete structural walls, or shear walls, act as major earthquake resisting members. Structural walls provide an efficient bracing system and offer great potential for lateral load resistance. The properties of these seismic shear walls dominate the response of the buildings, and therefore, it is important to evaluate the seismic response of the walls appropriately.

In this present study, main focus is to determine the solution to strengthen the shear wall. General practice is to apply pre-stressing and post-tensioning while design and constructing new structure, These technologies can also effectively used for retrofitting of old structures.
The lift core wall acts as a shear wall in reinforced concrete (RC) building in many cases. Major shear force is contributed by lift core wall. It is not practical and easy solution to strengthen each and every joint as well as column and beam. If we focus on shear wall strengthening we can effectively provide retrofitting solution. In this project we model the existing structure which is to be checked for any deficiencies and failure due to edge and seismic force.

We analyze the structure with the help of software. We check the existing members. The main idea is to retrofit the shear wall which is main horizontal load resisting member. This report covers the technique of retrofitting of shear wall with the help of post tensioning cables connected to top steel girder, which is supported on shear wall. The cables are anchored at the bottom in the rock. By applying post tensioning in the cable, we indirectly apply axial force which in turn reduce the negative stress due to bending moment at the bottom. Under reinforced can be made safe by this technique as long as concrete compressive 


Retrofitting of Structure for Seismic Force Using Post Tensioning of RC Shear Wall
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