Seismic Design of a Super High-Rise Hybrid Structure

Abstract eng:
In China, hybrid structure is frequently used for super high-rise building, and this structural system has an advantage of reducing investment. This paper is concerned with the seismic design of a super high-rise hybrid structure on a background of project by using linear elastic analysis and nonlinear elasto-plastic analysis. The hybrid structure consists of concrete shear walls, steel reinforced concrete (SRC) columns, concrete-filled square steel tubular (CFSST) columns, SRC beams and steel beams. Firstly, comparing steel structure and hybrid structure on seismic behavior and construction cost, we choose the latter system. Then, two structural design programs are utilized for elastic response spectrum analysis combined with elastic time-history analysis, and the results of two programs are quite close. Thirdly, static nonlinear analysis (pushover analysis) and dynamic nonlinear analysis (elasto-plastic time-history analysis) are performed to evaluate the seismic performance of the hybrid structure. Moreover, the important parts, such as strengthened part at bottom and hotel lobby at middle, are analyzed carefully to ensure the key columns are in elastic state under fortifiable earthquake. Conclusion can be drawn that the super high-rise hybrid structure achieves the earthquake performance objective, and the seismic design of the building can satisfy the inspection due to out-of-codes.

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