Effect of Seismic Retrofit on Seismic Risk Mitigation for Reinforced Concrete Buildings

Abstract eng:
It is of great importance to assess the seismic risk of existing buildings located in a high seismic region to avoid destructive damage due to severe earthquakes. In Japan, seismic capacity evaluation and strengthening have been applied to existing buildings especially after the 1995 Hyogoken-Nambu Earthquake. Judging criteria in seismic capacity for screening candidates to strengthening and required capacity level is generally set to harmonize with current seismic code. However, there has been few study that tried to prove the effect of seismic retrofit on mitigation of seismic risk such as damage ratio, repair cost, and number of injuries and death induced by severe earthquake. In this paper, therefore, the effect by seismic retrofit is investigated. First, the relationship between seismic capacity and damage ratio of reinforced concrete buildings suffered 1995 Hyogoken-Nambu Earthquake is discussed. Secondly, seismic capacity of public buildings in Sendai City before and after seismic retrofit is statistically examined and distribution of seismic capacity of R/C public buildings is calculated. Damage ratio due to earthquakes, which are expected to attack Sendai City in the near future, is estimated by probabilistic approach for both before and after retrofit. The cost for repair and reconstruction of damaged buildings based on the estimated damage ratio and the effect of seismic retrofit on mitigation of seismic risk is examined. Finally, parametric study with different target seismic capacity for retrofit is carried out and the relationship between the target seismic capacity and predicted seismic risk was discussed from a cost point of view.

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