Energy dissipation optimal design considering accidental eccentricity of structures

Considering that accidental eccentricity magnifies the seismic response of certain structure and has impact on the energy dissipation components in structures, a combined energy dissipation strategy blending viscous-fluid damper with buckling-restrained brace was put forward. Dampers were installed on the isolation layer at the bottom to dissipate seismic energy, and buckling-restrained brace was installed at the four corners of the building above the isolation layer,which enhances torsional rigidity of the structure and relieves the impact of accidental eccentricity and facilitates dissipating seismic energy in earthquake. Besides, two 10-storey-framework buildings with length-width ratios of 1.00 and 2.33 were selected and elastic analysis and elastic-plastic time-history analysis were made by adopting ETABS and PERFORM-3D. The results show that the impact of accidental eccentricity on the dissipation capacity of damping structure can not be ignored. With a proper number of dampers at the isolation layer, the seismic response control effect is greatly improved when lateral rigidity of buckling-restrained brace is increased. This energy dissipation strategy requires fewer dissipation components and meanwhile can ensure the utilization ratio of architectural space. Therefore, it is an optimized design for energy dissipation structures and has practical value. ©, 2015, Central South University of Technology. All right reserved.