Seismic Performance Analysis And Design Of High-rise Buildings With Energy Dissipation Devices Under Super-strong Earthquake

The earthquake is a kind of natural calamity with great harmfulness. It often causes heavy casualties and economic losses due to the randomness and uncertainty of its occurrence. With the development of the society and the improvement of living standards, the requirements of seismic performance of important structures and urban function-protected structures are also increasingly higher. However, the structures designed by traditional seismic fortification criterion of no damage under frequent earthquake, repairable damages under basic earthquake and no collapse under severe earthquake may cause enormous economic losses after severe earthquake, may be difficult to ensure no-collapse under super-strong earthquake, and may be difficult to ensure that important structures and urban function-protected structures can work under severe earthquake. The structures with energy dissipation devices are safe, economical and easy to realize higher seismic performance. Thus the structures with energy dissipation devices provide the possibility of no-collapse under super-strong earthquake within the acceptable economic level. A higher seismic fortification criterion of repairable under severe earthquake and no-collapse under super-strong earthquake is proposed on the basis of the traditional seismic fortification criterion. Detailed analysises on seismic performance of high-rise buildings with energy dissipation devices under super-strong earthquake were made. The main contents and conclusions are following.(1) The necessity and feasibility of high-rise buildings with energy dissipation devices meeting the requirement of no-collapse under super-strong earthquake is discussed at first. Secondly, a 12-story plane reinforced concrete frame structure is designed with "the structural design software PKPM, under the requirements for 8-degree fortification against earthquakes. And then viscous damper, friction dampers, and buckling-restrained brace are arranged in the structure, respectively. Thus three structures with energy dissipation devices are got. Finally, nonlinear time history analysis of the four structures are conducted. The calculation and analytical results show that:the friction dampers and the buckling-restrained brace do not slide or yield, viscous dampers can provide larger additional damping for the frame structure; friction dampers can play a better control effect under frequent earthquake, severe earthquake and super-strong earthquake; the three structures with energy dissipation devices meets the requirement of no-collapse under super-strong earthquake. (2) A 48-story mega frame structure is designed with the generalized structural analysis and-design software SAP2000, under the requirements for 8-degree fortification against earthquakes. And then, all the braces of the mega structure are replaced by BRBs whose stiffness are equal to common braces or BRBs whose area are equal to common braces, respectively. The two updated structures are referred to as the EKBRB structure or EABRB structure, respectively. Finally, nonlinear time history analysis of the three structures are conducted under 8,8.5 and 9 degree earthquake. The calculation and analytical results show that:inter-story drift ratio of BRB structure is significantly reduced and changes more uniformly under 8 degree earthquake compared to the mega structure; the BRB structure meets the seismic fortification criterion of repairable under severe earthquake and no-collapse under super-strong earthquake. Thus it can be seen that the BRB structure provides enough emergency capacity for structures.(3) A 20-story reinforced concrete shear wall structure of 7 degrees fortification was selected. Friction dampers are arranged in 2-13th floor of the structure. Thus a structures with energy dissipation devices is got. And then nonlinear time history analysis of the two structures are conducted. The calculation and analytical results show that:friction dampers on the main structure can play a good control effect; friction dampers can provide larger additional damping for the reinforced concrete shear wall structure; dampers should be arranged in each floor of the structure in order to avoid that inter-story drift ratio of floors without energy dissipation devices in the updated structures are larger than inter-story drift ratio of floors in the original structure; the structure with friction dampers meets the seismic fortification criterion of no-collapse under super-strong earthquake.