Discussion of Displacement-based Seismic Design Method

The multi-degree-of-freedom system is equivalent to the single-degree-of-freedom system according to the characteristics of RC frame structures.The equivalent parameters of the single-degree-of-freedom system are calculated.A newly-modified method of displacement-based seismic design is presented.The seismic performance is divided into five levels,i.e.function integrity,function continum,damage control,loss control and life-safety,and different levels are quantified with storey drift ratios.Compared with the force-based procedure on the deformation and the ration of reinforcement based on the seismic code,displacement-based seismic design is applied in case studying,it is revealed that the displacement-based seismic design can more effectively control the structure reaction under the earthquake,and the five performance levels are more easily used for the multi-levels design for satisfying the owner's different demands about anti-seisic performance objective.