Energy-balance Based Modal Pushover Analysis Method And Its Application In High-rise Hybrid Structure

With the development of the seismic design theory and people’s awareness of the earthquake, the Performance-based Seismic Design become has become one of the most advanced seismic design theories. Performance-based Seismic Design methods mainly include displacement-based seismic design methods and energy-based seismic design methods, and its core is nonlinear analysis. Current researches focus on the displacement-based seismic design and nonlinear dynamic analysis, but there are few researches for on the energy-based seismic design and nonlinear static analysis, especially energy-based pushover analysis. From perspective of energy-balance, and combining the modal pushover analysis(MPA) metho d with the country’s normative response spectrum, the thesis has proposed the modal pushover analysis method based on energy-balance and suitable for the norms. What’s more, the thesis has studied the application of MPA to high-rise steel frame-reinforced concrete tube hybrid structure. The main work of this thesis is done as the following:(1) On the basis of modal pushover analysis method, the energy-balance based modal pushover analysis method is presented combining with the capacity spectrum method and the energy-balance concept. This thesis elaborates energy coefficient and its solution formula as well as the detailed process of constructing energy capacity spectrum curve and energy demand spectrum curve of energy-balance based MPA method. A 12-story steel frame and reinforced concrete tube hybrid structure is given as an example to verify the practicability of the energy-balance based MPA method, compared with the conventional pushover analysis method and the dynamic time history analysis method.(2) The energy-balance based MPA method on the one-way asymmetric structure is presented and a 20-story steel frame- reinforced concrete tube hybrid one-way asymmetric structure is given as an example to verify the practicability of the energy-balance based MPA method with and without torsion, compared with the conventional pushover analysis method and the dynamic time history analysis method.(3) The energy-balance based 3D-MPA method on the two-way asymmetric structure is presented and a 20-story steel frame- reinforced concrete tube hybrid two-way asymmetric structure is given as an example to verify the practicability of the energy-balance based 3D-MPA method, compared with the 3D modal pushover analysis method and the dynamic time history analysis method.