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Topology Optimization Design for the Thick Plate Transition Layer

Author: LiYan
Tutor: HeYiBin
School: Hunan University
Course: Structural Engineering
Keywords: High-rise building Thick plate transition layer Topology optimization design Space truss theory Strut-and-tie model
CLC: TU375.2
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
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Abstract


With the rapid development of our country’s economic construction, the functional requirements of the high-rise building is becoming more and more complicated. The development trend of the modern high-rise building is to the multi-function and comprehensive application.The bays in different sizes are needed for the different structure form and the layer with various usages.To satisfy the requirement of the architectural function and realize the anti-conventional structure arrangement,the transfer layer must be used when the structure type is changed.The thick plate transfer layer is a necessary structural form when the small size column grids at the up layer is changed into large size column grids at the bottom layer,because the beam transfer layer can’t resist the upper structures. The column grids at the bottom storey can be flexible arrangement,so no need to align with the superstructure.However, the wide application of the thick plate transfer layer in high-rise building is restricted by it’s disadvantage such as the very heavy self weight, hydration heat, poor anti-seismic performance, flexible arrangement of large equipment system and so on. In fact,the force situation of the thick plate transfer layer is very complicated.The internal force and the displacement is seriously uneven under the effect of the plate thickness,the size of the column grid,loading mode and support condition.To reduce the self weight,save up the cost and be beneficial for the seismic resistance. The FEA software ANSYS is adopted for the topology optimization design of the thick plate transfer layer which is subjected to the vertical loads, the wind loads and horizontal earthquake. Then the space truss model with strut and tie is obtained, and the mechanical behavior is analysed based on the above study. The main contents are as follows:The research history and current application of transfer layer are reviewed, especially the thick plate transfer layer are stated in detail.The theory and method of topology optimization is described in the thesis, especially for the continuum structure.The transfer mechanism of the thick plate transfer layer are obtained based on this.Based on the strain energy criterion, the thick plate of various layout of the shearing wall and column are researched by the APDL of ANSYS.Through the finite element post processing function ,the space truss model with strut and tie is obtained which reflect the optimal path of the load transferring in thick plate. This method can greatly improve and speed up the convergence.Incorporating with the result of the finite element , the bearing capacity calculation and reinforcement design of the tie rod ,strut bracing and joint for the thick plate optimized is deduced using the strut-and-tie theory in this thesis.

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