Effect of CFRP Retrofitting on Seismic Vulnerability of Reinforced Concrete Frame Structures in Pakistan
Keywords:Seismic Vulnerability, Hazard, Nonlinear Analysis, Reinforced Concrete Frame Structures, Risk, Retrofitting, Response Spectrum, Capacity Spectrum.
The objective of this research work is to study the effect of CFRF retrofitting on the seismic vulnerability of typical reinforced concrete structures in Pakistan. Pakistan is located in high seismicity zone as it lies on seismic fault line which divides the area in such a way that half of it lies in Eurasian plate and other half lies in Indian plate. After the massive earthquake of Kashmir 2005 most of the structures failed because of the high seismic vulnerability of existing structures. After 2005 event, earthquake zones were also changed to a higher hazard level, hence increasing the seismic demand on the existing structures that were constructed prior to the earthquake 2005. This research accounts for the seismic vulnerability assessment of reinforced concrete frame structures in Pakistan and the effect of retrofitting on these structures. After carrying out a detailed survey of Pakistan a hypothetical reinforced concrete frame structure, typologically similar in construction practices in Pakistan is designed and modelled in Perform 3D to study the effect of lateral forces on these structures. Seismic vulnerability curves are computed using Capacity Spectrum Method and the effect of seismic forces on existing structure is studied. In order to improve the seismic performance the joints of RC frame structure are retrofitted using CFRP which are the critical elements for structural performance. By using the confined properties of concrete through CFRP, an analytical curve is developed again using the same procedure. These curves are compared and the effect of retrofitting is studied.
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