Seismic Collapse Probability Considering Pounding and Financial Loss Estimation of Base-Isolated Reinforced Concrete Buildings

Abstract

In this paper, the seismic collapse probability of base-isolated reinforced concrete buildings considering pounding with a moat wall and financial loss estimation is studied. For this purpose, three-dimensional finite element models of a code-compliant 10-story base-isolated shear wall-frame (BI-SWF) building and a 10-story base-isolated moment resisting frame (BI-MRF) building are used. Results indicate that the BI-MRF building has a greater probability of collapse compared to that of the BI-SWF building, the probability of collapse in 50 years for the BI-MRF building is 1.3 times greater than that of the BI-SWF building for both no pounding and pounding cases. The probability of collapse increases when pounding is considered, which results in a smaller value of the collapse margin ratio compared to no pounding case for both the buildings. The financial losses resulting from damage to the BI-MRF and BI-SWF buildings under design earthquake (DE) and risk-targeted maximum considered earthquake (MCER) levels are calculated for the no pounding case, since there was no pounding under DE-level and very few instances of pounding under MCER-level. Calculation of financial losses due to damage to structural and nonstructural components, service equipment and downtime shows that the BI-SWF building results in larger repair costs and downtime cost compared to the BI-MRF building.

Seismic pounding damage to adjacent reinforced concrete frame–shear wall buildings and freestanding contents

“…While a majority of studies were focused on seismic pounding between adjacent frame buildings, very few have addressed the effect of pounding on slender RC frame–shear wall (or simply termed “frame‐wall”) systems, 14,19 which are commonly used structural forms for tall buildings in modern urban areas. Fatahi et al 14 .…”

“…Two ground motion records were adopted to demonstrate the seismic pounding effects on the distribution of internal forces and deflections along the piled buildings. Bhagat and Wijeyewickrema 19 showed that for base isolation systems, using RC frame‐wall buildings resulted in lower probability of collapse than using RC MRFs. It was shown that seismic pounding effects reduced the difference of the collapse probability between using the two stated structural systems.…”

“…While a majority of studies were focused on seismic pounding between adjacent frame buildings, very few have addressed the effect of pounding on slender RC frame-shear wall (or simply termed "frame-wall") systems, 14,19 which are commonly used structural forms for tall buildings in modern urban areas. Fatahi et al 14 developed a detailed finite element model to simulate pounding phenomenon of three equal-height pile-supported tall buildings consisting of a 15story RC MRF sandwiched by a pair of RC frame-wall buildings.…”