RESIDUAL DEFORMATION OF STEEL FRAMES WITH HYSTERETIC DAMPERS

Abstract

This paper presents a seismic design procedure to estimate the residual deformation of steel frames with hysteretic dampers when main frames do not yield under earthquake excitations. Dynamic response analysis is carried out on single-degree-of-freedom systems with various structural parameters. From these numerical results, the critical parameters that control residual deformation are found to be (1) stiffness ratio of damper system to main frame and (2) initial yield deformation. Based upon the energy-balance consideration during a half-cycle, residual deformation is derived in explicit form as functions of these parameters. The proposed method is applicable for multistory frames.