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Jiabao station double helix structure of single-layer reticulated shell

Author: LiQian
Tutor: ChenZhiHua
School: Tianjin University
Course: Structural Engineering
Keywords: Monolayer shells Double helix Static Analysis Static Stability Geometric and material nonlinearities Earthquake Response
CLC: TU399
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 0
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Abstract


Reticulated shells derived from human to mimic natural arch shell, has a long history. With the development of building materials, reticulated shells gone through several stages of development. To this day, with the shell structure calculation theory and computational means of progress and improvement in the form of reticulated shells increasingly rich, applications are increasingly widespread. Compared with the traditional single-layer lattice shell, single-layer reticulated shell Jiabao in structural forms, rod section type and structure of the span to achieve a breakthrough. The single-layer reticulated shell rod clockwise and counterclockwise spirals bidirectional distribution and cross-generation grid. This is the first in a monolayer shells are used in welding rod rectangular cross-section. The shell structure of the span in both directions are up to 143 meters and 80 meters, which is currently is the largest single-span reticulated shell. This paper considers single-layer reticulated shells Jiabao boundary conditions, load cases and impose a number of factors such manner, for the construction for a reasonable simplification, and select the appropriate unit type, built in ANSYS FEM overall model. Then the shell structure of static analysis. Through eight different load cases, structural deformation, stress and bearing reaction force calculation, to understand the structure of the static response characteristics. The calculated results show that the stress level is lower shell structure, structural deformation meet the regulatory requirements, with good static response characteristics. Secondly this paper, the stability analysis of shell structures. First introduces the basic concepts of stability and common shell stability calculation method. Upon completion of the structure eigenvalue buckling analysis, and then considered separately geometrically nonlinear, material nonlinearity and installation factors such as initial defects affecting the stability of the structure, using the arc-length method to calculate the overall shell static stability, the formation of multi-point load - displacement curve of the whole process of tracking, obtain structural stability coefficient. The results are displayed in the initial imperfections and geometric nonlinear conditions, shell stability factor of 8.3; considering initial defects and double nonlinear conditions, shell stability factor of 5.2. The structure has good stability. Finally, the shell structure of the seismic response analysis. Firstly, introduces the causes and characteristics of the earthquake, and then introduced the seismic effect common calculation method. In the vibration characteristics of the structure based on the study, respectively, using modal response spectrum method and time history analysis method to calculate the structure in three to the total response under earthquake, and seismic design evaluation and recommendations. The results showed that under the action of the earthquake, the Reticulated stress and deformation amount is not large, the seismic response is not obvious.

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CLC: > Industrial Technology > Building Science > Building structure > Other structures
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