Relationships for Evaluating the Seismic Resilience Index of Reinforced Concrete Buildings Built Up with FRP Lying on Different Soil Types under Near-Field Earthquakes

• Published in: Iranian journal of science and technology. Transactions of civil engineering 2024, Vol.48 (6), p.4215-4231
• Main Authors: Pour, Hooman Barjouie Roshan, Saffari, Hamid
• Format: Article
• Language: English
• Subjects: Accelerometers; Cement industry; Ceramics industry; Civil Engineering; Concrete; Damage assessment; Earthquake damage; Earthquake resistance; Earthquakes; Engineering; Fiber reinforced plastics; Fiber reinforced polymers; Frames; High rise buildings; Low rise buildings; Multistory buildings; Near fields; Polymers; Reinforced concrete; Research Paper; Resilience; Retrofitting; Seismic activity; Seismic analysis; Seismic engineering; Soil analysis; Soil types; Soils; Strengthening; Structural damage; Sustainable development
• ISSN: 2228-6160; 2364-1843
• DOI: 10.1007/s40996-024-01404-x

In recent decades, many researchers have focused their attention on seismic evaluation and vulnerability of structures before and after the earthquakes. As recognizing the structure condition after an earthquake is of vital importance, the capability of enduring future earthquakes and continuous serviceability through estimating structural damage is defined using the damage index. In the present research, the seismic resilience assessment before and after strengthening with FRP has been accomplished for low-rise, mid-rise and high-rise buildings with Reinforced Concrete (RC) moment resisting frames in the near-field sites. In this respect, use has been made of nonlinear incremental dynamic analysis with 104 seismic accelerometer records corresponding to 4 different soil types within the near-field sites. Also the results of vulnerability and seismic resilience curves after strengthening with Fiber Reinforced Polymer (FRP) are presented for the 3, 6 and 9-story buildings. The results obtained in the present research well depict that retrofit of RC moment resisting frames with FRP could increase their resilience. The results of the research clearly show that in the moment resisting frames at lower accelerations (about 0.2 g), the vulnerability of mid-rise and high-rise buildings is much higher than that of the low-rise buildings. But there is no significant difference between the mid-rise and high-rise buildings. By increase of the site acceleration, the vulnerability of mid-rise and high-rise buildings would significantly increase with respect to the low-rise buildings, but its severity would decrease with respect to lower accelerations. In other words, by increase of the earthquake acceleration, the percentage of vulnerability in the 6-story and higher buildings would approach that of the 3-story buildings. The retrofitted structure with FRP has a higher resilience at all the levels with respect to the existing structure. But the advantage of strengthening varies in different conditions and with different number of stories and soil types.