Seismic Performance Analysis Of Energy-dissipation Rocking Structures

The ideal building destruction mechanism is the overall destruction caused by the failure of all beam hinges.However,under earthquakes,the frame structure often collapses due to partial destruction.Research on how to improve the seismic performance of structures has become a hot spot.Combining four-level seismic fortification objectives which can be summarized as “no damage under minor and moderate earthquake,replaceable or repairable under major earthquake,and no collapse under mega earthquake”,the seismic performance of the spring-supported rocking structure,frame-rocking wall structure,and rocking truss-frame structure are studied,and a double energy dissipation rocking truss-steel frame structure system is proposed.The main research contents are as follows:(1)A contrast model of a spring support and a fixed support steel frame are established and comparing the maximum interlayer displacement angle of two structures under frequent earthquake.Contrast the addition of viscous damping in the structure to study its working performance and the seismic performance of the whole structure under the four-level seismic fortification objectives.(2)The numerical model of the frame structure,the frame-shear wall structure and the frame-rocking wall structure are established.The static elastic-plastic analysis and dynamic time-history analysis are carried out to study the seismic performances of them from the performance indicators such as the napping capacity curve,performance points,and wall internal forces etc.(3)Based on the steel frame model,a rocking truss-frame model and a frame-concrete rocking wall structure with equivalent bending stiffness are designed.And the bearing capacity and the distribution and development of plastic hinges among the three are compared and analyzed.(4)For buildings with high seismic performance requirements,a double energy dissipation rocking truss-steel frame structure system is established,that is,viscous dampers are installed at the connection between the rocking truss and the steel frame,and self-centering energy dissipates are equipped at the bottom of the truss,and study the energy dissipation capacity of the energy dissipation device and the seismic response of the structure.(5)Summarize the above research results and look forward to the key technology of rocking structure in practical engineering application...