The Distribution Of Interlaminar Hysteretic Energy Demand Of Chevron Steel Braced Frames

The design method based on bearing capacity is used in Code for Seismic Design of Building, without considering the influence of inelastic response of structures and duration of strong earthquakes. The energy-based seismic design method considering force, displacement, duration and other factors, can give a comprehensive assessment of the structural damage. The hysteretic energy is the main research content and predicting the distribution of hysteretic through the structure is the basis of the rational energy based design method.In this paper, the Chevron Steel Braced Frames(CSBF) with 10-layer 3-span,15-layer 3-span and 20-layer 3-span are designed by SAP2000. The beam element model is used, and input motions are some far-fault seismic records and near-fault seismic records with pulse effect. The distribution of interlaminar hysteretic energy demand and it’s distribution law, the proportion of hysteretic energy of the brace of three models under 8-degree(0.3g) far-field and near-field seismic records are obtained. The formulas for distribution ratio of interlaminar hysteretic energy demand of Chevron Steel Braced Frames(CSBF) are analysed under far-field and near-field seismic records are proposed, and the results show that near-field earthquake will increase the response of bottom of the structure and Chevron Steel Braced Frames designed according to Code for Seismic Design of Building underestimate the role of near-field earthquake with pulse effect on structures.The influence of the characteristics of ground motions and structures on the distribution law of interlaminar hysteretic energy is analysed.