| Currently, the super-high-rise fram-core tube structure with strengthened stories has been more widely used. According this structure form, the paper studied its form selection, performance-based seismic design and seismic performance analysis by design and finite element analysis software(FEA) Midas Building. The main contents are as follows:(1)As a super-high-rise fram-core tube structure for example, three structural scheme comparisons were studied:different outrigger numbers; different strengthened stories and ring band members; different set positions of strengthened stories. Comparative structural modal cycle, story response and base shear of the building by response spectrum analysis. The paper proposed safety program of the structure.(2) Based on performance-based seismic design theory, Specified appropriate performance targets to the structural elements, and designed in the FEA Midas Building, then analyzed by pushover method to verify the achievement of the targets of the structure.(3)Selected the suitable three measured waves and an artificial wave by comparison of the elastic history analysis and response spectrum analysis results. Elastic-plastic analysis of the structure in four schedule loads under moderate earthquake and rare earthquake were made to verify the structural performance targets, and the results were compared with pushover analysis results to investigate the reliability of the pushover analysis method and the difference between the results of different electoral wave analysis.(4)Used the restrained brace in the outrigger trusses and ensured the brace would not yield under moderate earthquake. Selected appropriate hysteresis model for the brace in the FEA Midas Building. Contrasted the yield mechanisms and earthquake effections of the structure while using restrained brace and ordinary brace to verify the advantages of the restrained brace and the simulate effection of the software. |
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