Abstract
This paper investigates the correlation between ground motion parameters and displacement demands of mid-rise RC frame buildings on soft soils considering the soil-structure interaction. The mid-rise RC buildings are represented by using 5, 8, 10, 13, and 15-storey frame building models with no structural irregularity. A total of 105 3D nonlinear time history analyses were carried out for 21 acceleration records and 5 different building models. The roof drift ratio (RDR) obtained as inelastic displacement demands at roof level normalized by the building height is used for demand measure, while 20 ground motion parameters were used as intensity measure. The outcomes show velocity related parameters such as Housner Intensity (HI), Root Mean Square of Velocity (Vrms), Velocity Spectrum Intensity (VSI) and Peak Ground Velocity (PGV), which reflect inelastic displacement demands of mid-rise buildings as a damage indicator on soft soil deposit reasonably well. HI is the leading parameter with the strongest correlation. However, acceleration and displacement related parameters exhibit poor correlation. This study proposed new combined multiple ground motion parameter equations to reflect the damage potential better than a single ground motion parameter. The use of combined multiple parameters can be effective in determining seismic damages by improving the scatter by at least 24% compared to the use of a single parameter.
Highlights
The seismic hazard is quantified by the intensity measure (peak ground values of acceleration (PGA), velocity (PGV), etc.) of a ground motion, while the structural damage state is defined by the demand measures
The results showed that a medium correlation was obtained between the damage index of the 6-storey reinforced concrete (RC) frame building and the Peak Ground Acceleration (PGA), while a strong correlation was observed with Arias Intensity (Ia)
The roof drift ratio (RDR) is used for demand measure and it is obtained as inelastic displacement demands normalized by the building height
Summary
The seismic hazard is quantified by the intensity measure (peak ground values of acceleration (PGA), velocity (PGV), etc.) of a ground motion, while the structural damage state is defined by the demand measures (maximum interstorey and roof drift ratio, etc.) [1]. It is very important for PBEE to obtain a ground motion parameter, which represents the statistical relationship between IM and DM with smaller dispersions [1] For this reason, many studies are ongoing on the issue of the GMP, to reflect the statistically best structural damage potential. Elenas and Meskouris [15] examined the relation between maximum interstorey drift ratio/overall structural damage index of a 7-storey reinforced concrete (RC) frame building and 10 different GMPs using 20 acceleration records. 1040 records were selected from 4 different earthquakes, which are far-fault motion They concluded that Velocity Spectrum Intensity (VSI) has the best correlation, followed by Housner Intensity (HI) and Spectral Acceleration (Sa). This study investigates the correlation of GMPs with roof drift ratios of mid-rise RC frame buildings with no shear walls on soft soil considering soil-structure interaction. The roof drift ratio (RDR) is used for demand measure and it is obtained as inelastic displacement demands normalized by the building height
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