SEISMIC RETROFITTING THROUGH EXTERNALLY ATTACHED SUB-STRUCTURES TO IMPROVE STRUCTURAL RESILIENCE

Abstract

SPSW has become a new innovative approach in seismic retrofitting through externally attached sub structure due to its numerous advantages like having low space requirements, high energy absorption capacity and lateral load resisting capacity. This thesis comprises a thorough investigation of Special SPSW at 6 different orientations. 5 different earthquakes are chosen, and detailed study is done for these different intensities of earthquake to assess at which orientation SPSW performs well. The orientation at which SPSW is attached to structure are front and back, at center, at rectangle lift, at cross and L shaped at corners. Ther results are compared with the model devoid of SPSW. Nonlinear time history analysis (NTHA) is conducted to analyze the behavior in terms of story drift, story displacement, story shear, and overturning moment. The SPSW at front and back and L shaped showed a significant reduction in all these factors like story drift, energy absorption, lateral load resisting, story displacement and help in mitigating the seismic effect. Also, Story shear values increased to a great extent by application of in these two configurations. This has provided Stability to structure against seismic forces. Correspondingly there was an increase in Acceleration values that indicates the potential reduction of Dynamic cultural behavior of structure during earthquakes. This study provided solution to seismic retrofitting of old structures that don’t meet the seismic criteria today by applying SPSW at front and back and L shaped plates at corner has a significantly effect. Keywords: SPSW, Shear Wall Orientations, NTHA, Retrofitting, Earthquake Resistant Structure