EXPERIMENTAL AND ANALYTICAL INVESTIGATION OF SEISMIC RETROFIT FOR RC FRAMED SHEAR WALLS

摘要

The RC framed shear walls are popular to resist the earthquake loads efficiently. The recent past earthquakes reveal that they are vulnerable to large seismic excitation. To satisfy the demand of high energy absorption by large earthquake, it is necessary to retrofit the existing framed shear walls with converting the failure mode from shear to flexural or uplift one. Considering these facts, two retrofit techniques are proposed here. One is retrofitting of column only using steel plates, steel corner blocks and high strength steel bar (referred to as PC bar hereafter) prestressing. The other one is retrofitting of framed shear wall using additional concrete sandwiched by steel plates and PC bar prestressing. The proposed techniques are experimentally investigated and analytically evaluated. The seismic performance of the specimens are also discussed here.