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Sensitivity Analysis of Member Length Errors of Flexible Tensile Structures

Author: ChengJun
Tutor: DengHua
School: Zhejiang University
Course: Structural Engineering
Keywords: Cable structures Tensile structures Dynamic Relaxation Method Component error Tension deviation Construction tension Sensitive indicators Sensitivity matrix Genetic Algorithms Sensitivity Active tension cable Initial pre- tension
CLC: TU399
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 2
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Abstract


The basic structural characteristics of prestressed cable-strut tensile structures, are responsible for providing structural rigidity and to ensure stability of the structure morphology. As a class of prestressed structures, member length error (ie the cable length and rod length error, hereinafter referred to as the \How to effectively control the length of the error effect of such structural design, construction design tension especially critical problem. This article focused on the cable - strut member length error effect, carry out the following three aspects of the research work. First, this paper gives the member length error effects (including pre the tension deviation and form deviation), the mathematical description of the analysis of the problem and not be required to establish the overall stiffness matrix of dynamic relaxation method to solve, and the use of a catenary cable element model and The precise coordination equation to ensure the calculation accuracy. Sensitivity matrix' dissertation">Sensitivity matrix to reflect the pre-tension deviation length error relationship. Active tension cable select an engineering method. Taking into account the actual construction of the structure forming in sheets of cable force to control the situation, further length error effect of the presence of cable force constraints based on Newton's method for solving strategy, pointing out that the ability to effectively control the effect of the length of the error was to evaluate the tension cable an important basis of the scheme is reasonable. Second, for a length of flexible pre-tension cable rod system in the process of construction tension error sensitivity, this paper Sobol analysis of variance-based sensitivity analysis methods. Use of the derivation of the analytical expression of the the length error sensitivity matrix, the length of error of two different cable-strut tensile structures-order sensitivity index is calculated and analyzed to compare the different tensioning programs on the structure of the initial pre-tension impact. Also length error sensitivity analysis of the advantages and disadvantages of using Sobol and effectiveness. Third, the the actual pretension state judge for cable-strut tensile structures and pre-tension deviation adjustment problems, most agile solution strategy long error combinations cable-strut tensile structures based on genetic algorithms, based on the measured initial pre-tension anti quest long error combinations of analysis methods. Advantages and disadvantages of mast cable-stayed suspension system combined with an actual project also solving and measured the least agile long error combinations pre-tension deviation analysis using the above method, and using genetic algorithms for the above problem analysis and effective sex is discussed.

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