Seismic pounding effects on typical building structures considering soil-structure interaction

Abstract

This study aims to evaluate pounding effects on typical building structures considering soil-structure interaction. For this purpose, 4 different adjacent building combinations were created by using 4, 8, 12 and 16 story building models. Nonlinear time history analyses were performed for 15 different ground motion records and building row effects were taken into consideration. The results indicate that, displacement demand tend to decrease in collision direction and increase in free direction. Maximum IDR demands are increasing mostly due to impact effects. However, the biggest change is in the story drift pattern and damage mechanism. Plastic rotations are shifted between column and beam members throughout building height. This behavior is apparent for all models. Maximum roof drift demands obtained for fixed-base approach reasonably close to soil-structure interaction models in average. On the other hand, the effect of modelling is obvious for pounding cases when the maximum IDR values are evaluated. Results obtained for ground motion record show large scatter due to the nature of dynamic analysis. For this reason, it is not meaningful to make a general assessment using single or few numbers of record.