In this paper

the nonlinear time history analysis of structure braced with viscous dampers is discussed.The mechanics model of the brace and the damper is presented

an analysis about the selection of ground motion is made

and the advice of the selecting method is put forward.The model of two-plane-frame structure with three stories

braced with viscous dampers is built.We use IDARC 2D to make nonlinear time history analysis

and this software is accomplished in nonlinear analysis.We research the seismic response

distribution of plastic hinges and damage of structure when frame is in plastic phase

then we point out the design essentials of this kind of structure

and make it a gist for the practical engineering.