The Design And Study On Seismic Behavior Of Energy Dissipation-Eccentrically Braced Frames

Eccentrically braced frames is a new kind lateral-loads-resisting system,the system combine the advantages of both moment-resisting frames and concentrically braced frames, which can meet the requirements of strength, stiffness and energy dissipation capacity of the structure.Structure vibration control technique is an active research domain in the structural engineering .And because the passive control doesn't need the importation of the outside energy ,so it become the mainstream of the present structure vibration control technique.Energy dissipation devices be set on the diagonal brace of eccentrically brace in this paper .The devices be in the elasticity state with enough initial rigidity, and the structure still have the enough lateral rigidity to meet the use requirements ,under the wind load and small earthquake. While the medium or violent earthquake coming , the devices occur elastic-plastic behavior firstly ,consume earthquake energy input to the structure ,and attenuate earthquake reaction rapidly ,avoiding the main structure occurs elastic-plastic behavior obviously , protect the main structure be destroyed in the violent earthquake.Based on examples of the eccentrically braced frames and energy dissipation- eccentrically braced frames, conclusion is drawn with response spectrum analysis and time history analysis that though the rigidity of structures reduced while the energy dissipation device set ,it still can be satisfied the requirement of the code ,and the structure have better energy dissipation capacity . At last ,use the Pushover method draw the base shear-displace curve ,the place and sequence of the plastic hinge . The energy dissipation device can consume part of earthquake energy before the links and delay the links yield ,protect the contiguous columns and braces to the links effectually.Setting energy dissipation device on the diagonal brace of eccentrically brace still be placed in the blank states. The research results of this paper confirm that the new structure system have better earthquake resistant behavior, and provide theory foundation for further step theory analysis and engineering application.