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The Research on Static Behaviors and Structural Optimization of Pretensioned Spherical Reticulated Mega-structure

Author: ZhouJiaWei
Tutor: HeYongJun
School: Hunan University
Course: Structural Engineering
Keywords: Prestressed Spherical reticulated mega- structure Static performance Construction tension Three optimization method The Bousso sterile type Geometric nonlinearity
CLC: TU399
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 1
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Abstract


Pretensioned spherical a giant grid structure is a spherical the giant grid structure arranged of prestressed Lasuoshijia new spatial structure, it has good mechanical properties, in theory, save steel, suitable to a large cross-development many advantages, but the study of the structure at home and abroad is relatively scarce. From cable tension construction, optimization analysis, optimize the structure of the basic static performance aspects of the the pretensioned spherical giant grid structure more in-depth study, including the following: First, based in batches the tension in the cable tension with the deformation of the structure changes, as well as batch after batch tension cable tension cable be an impact, proposed a process batches construction tension cable tension of the Iteration to solve each cable in batches tension process should produce the initial strain, the use of the calculation results allows each cable tension once there is actual tension value and the target tension value equal or close enough without having to repeated adjustments. And a numerical example to verify the effectiveness and feasibility of the method. Then, for pretensioned spherical reticulated mega-structure static performance optimization problem, pretensioned, three-dimensional truss beam height rod cross-section of the three-level optimization method. Different objectives and methods were used for each variable stepwise optimization. Optimization of the cross section of the rod to the structural weight as the objective function and using the full stress method; three-dimensional truss beam height by internal force peak and deflection than two indicators to be determined; optimize pretensioned with the square of the structural member forces and minimum objective function is a mathematical model, the use of the impact matrix linear optimization method and complex-shaped method to solve. A 180-meter span structure, five different Bousso program to optimize the analysis, and in accordance with the results of the analysis, choose the best Bousso way. Finally, the first analysis of the pretensioned spherical reticulated mega-structure of the main structure and the bottom of the sub-structure of most of the pole pieces of the internal forces distribution. Followed by parametric analysis in the form of the main structure of the vector cross-ratio and span, the height of the sub-structure, the mesh size and the prestressed structure is mainly affected by the force rod internal forces, nodal displacements, support reactions, the average amount of steel, deflection lower coefficient. And draw the static properties with geometrical parameters change the law; under different span ratio for deflection reduction factor, prestressed best value range. Reference to the recommendations given for the values ??of various parameters at the same time.

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