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The Dynamic Performance Analysis of Enlarged-Base Twin-Tower Structure with Conversion Layer

Author: BaiZuoXing
Tutor: MaFu
School: Taiyuan University of Technology
Course: Structural Engineering
Keywords: enlarged base twin—tower structures conversion layer vibration mode seismic performance vibration characteristics
CLC: TU347
Type: Master's thesis
Year: 2009
Downloads: 28
Quote: 4
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Abstract


Multi-Tap high-rise structure with conversion layer is a form of complicated high-rise structures, its structural mechanism is also very perplexed and it is so difficult to design. Because of mutual coupled vibration of multiple towers, its seismic performance is comparatively different from the traditional structure systems. The "High-rise building of concrete structures technology point of order"(JGJ3-2002)has done some conceptual provisions to seismic design of multi-tap structure, but has not done more in-depth and clear provisions to seismic analysis and measures, so interoperability is difficult. In terms of engineering design on the current, enlarged-base twin-tower structures mostly adopt symmetrical tower forms, while research to asymmetric twin-tower structures is finite and reference practical experience is also exile. Wherefore, this paper will mainly explore and study the overall mechanical behavior of asymmetric twin-tower structure.On the basis of theoretical analysis, this paper will make some residential project in Shan xi as target, and make use of SATWE and EPSA chassis modules of domestic engineering analysis software PKPM to systematically analyze enlarged-base twin-tower structures. Mainly the following aspects:First, integrating built project, this paper will theoretically investigate design method and force mechanism of conversion layer, and mainly analyze design and calculation method of beam conversion layer;Second, this paper will draw support the method of elastic response spectrum analysis in SATWE finite element analysis software to calculate and analyze the structure, comparatively analyze the impact of seismic force because of selecting the number of vibration mode, and propose the necessity of reasonably selecting the number of vibration mode;Third, this paper will analyze spatial reverse coupling property of the structure, explore the high-order vibration mode contribution to the structure and propose the necessity of comminuting high-order vibration mode to calculate; Fourth, on the base of project model, keeping a tower unchanging and changing the other’s rises, this paper will analyze the changes of shear at the bottom of the two towers;Fifth, this paper will compare the reverse effect of original structural model with the different tower rises model, and analyze exacerbation degree of structural reverse effect because of the increased asymmetry;Sixth, this paper will use SATWE elastic time-history analysis procedures and EPSA elastic-plastic static analysis procedures to check on the structure, then compare the consequence with the conclusions of static analysis.

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