Abstract
Extraordinary earthquakes which have been predicted in recent reports may induce the dissatisfactory of seismic demand and collapse of various existing high-rise buildings caused by the strength deterioration of structural components which is not fully considered in the past research. Various weak-beam planar-models of existing high-rise steel and concrete filled steel tube (CFT) frame buildings with different stories (20F, 30F and 40F) are designed, in which, the effects of strength deterioration after the local buckling of steel and CFT components in high-rise buildings are quantitatively considered to investigate the seismic capacity of high-rise steel and CFT buildings subjected to various high-level ground motions. Results show that the amplified effects of member deterioration on the seismic responses and hysteretic energy were captured in both steel and CFT building models. However, high-rise CFT building models demonstrate better capacity than S building models to avoid the local or global collapse, when the ground motions level is extraordinary. Assessment on the collapse resistant capacity of such tall buildings by incremental dynamic analysis clearly demonstrated the significant effect of local strength deterioration on the global seismic resistant capacity of high-rise building.
