Displacement-based seismic design method of steel moment resisting frame

In contrast to the traditional method of force-based seismic design,the newly developed displacement-based seismic design will more easily fulfill the requirement of performance-based seismic design.According to lots of documents previously studied,a seismic design method is put forward based on displacement for steel moment resisting moment.This method is established in condition that the yield displacement of steel frame can be determined by its geometrical dimension;then the objective displacement(ultimate displacement)can be determined in light of performance level of the structure,and the corresponding coefficient of ductility can be obtained.Thereafter,the design base shear of steel frame structure can be calculated by the use of reduced elastic spectrum.Thus,the design of stiffness and capacity can be conducted on steel frame structure.The analysis of case study indicates that the displacementbased seismic design method addressed herein is of reasonable safety and reliability,and of operational convenience,which can still realize the seismic design of steel frame structure at different performance levels.