拉索预应力谷线式叉筒网壳结构的静力与稳定性研究
发布时间：2018-08-06 20:51
【摘要】：叉筒结构是一种由若干柱面网壳相贯得到的空间结构,圆柱面相交的脊线或谷线以及特殊的边界条件等使叉筒网壳具有独特的传力路径和结构性能。但是,叉筒网壳的谷线是结构力流汇集处,容易出现应力集中,限制了叉筒结构的应用与发展。拉索预应力技术在空间网格结构的运用近几年在国内迅速发展,将预应力技术引入空间网格结构,能够使网壳多数杆件卸载,改善结构的受力状态,可多次利用杆件材料的强度幅值。将拉索预应力技术与叉筒结构有机的结合,能实现改善叉筒结构力学性能,扩大适用范围,提高结构经济性的诸多目的。为此,本文综合近几十年拉索预应力技术在平面拱、空间刚架、柱面网壳、球面网壳的理论研究与工程实例,结合叉筒网壳结构的受力特性,提出适用于叉筒网壳结构的多种预应力拉索布索方案,经过系统的性能分析对比选出效果最佳的布索方案,并深入系统地研究此方案下拉索预应力单层叉筒网壳的非线性静力与稳定性能,同时研究了支座位移与支座刚度对结构稳定性能的影响。本文主要做了以下几方面的工作:本文首先针对单层谷线式叉筒网壳提出了三种布索方案,对比分析了三种布索方案下叉筒结构的静力与稳定性能,并对支座约束条件的选择进行了研究,最终提出效果较佳的布索方案与支座约束形式,并对整体结构进行系统地研究。研究了较优布索方案下拉索预应力叉筒结构的力学特性,然后从大规模的参数分析着手,并结合未布索结构相关影响参数的变化进行对比,分析了最佳布索方案下的拉索预应力单层叉筒网壳的静力性能,并得出规律性结论。对布索与未布索的单层叉筒网壳结构的非线性屈曲模态进行了分析,然后通过大规模参数分析,研究了拉索预应力单层叉筒网壳的几何非线性稳定极限承载力,并在此基础上进一步研究了荷载不均匀分布和初始缺陷对结构整体稳定性能的影响,最后在考虑几何非线性的基础上,增加材料非线性的影响因素,分析拉索预应力单层叉筒网壳在双重非线性下结构的稳定性能,并基于分析结果与概率统计方法提出拉索预应力单层叉筒网壳的塑性折减系数,为实际工程提供参考。研究支座位移与支座刚度的改变对拉索预应力单层叉筒网壳结构的稳定性能的影响,考虑不同支座位移方向、支座位移点、支座水平刚度大小等因素的影响下对结构的极限承载力与荷载位移曲线进行分析,并提出工程参考意见。
[Abstract]:The cross tube structure is a kind of spatial structure which is obtained by intersecting several cylindrical reticulated shells. The intersecting ridge or valley line of the cylindrical surface and special boundary conditions make the cross tube latticed shell have unique force transfer path and structural performance. However, the valley line of the latticed shell is the place where the force flow converges, which limits the application and development of the cross tube structure. The application of cable prestressing technology in spatial grid structures has developed rapidly in recent years. The introduction of prestressed technology into spatial grid structures can unload most of the members of latticed shells and improve the stress state of the structures. The strength amplitude of member material can be used many times. The combination of cable prestress technology and fork tube structure can improve the mechanical properties of the cross tube structure, expand the scope of application and improve the economic efficiency of the structure. Therefore, this paper synthesizes the theoretical research and engineering examples of plane arch, space rigid frame, cylindrical reticulated shell and spherical reticulated shell with cable prestressing technology in recent decades, and combines with the mechanical characteristics of cross tube latticed shell structure. In this paper, a variety of prestressed cable cabling schemes are put forward, which are suitable for the cross tube latticed shell structure. The best cable arrangement scheme is selected through the performance analysis of the system. The nonlinear static and stability properties of single-layer cantilever latticed shell with pull down cable are studied systematically, and the effects of support displacement and support stiffness on the stability of the structure are also studied. The main work of this paper is as follows: firstly, three kinds of cabling schemes are proposed for single-layer valley line cross tube latticed shell, and the static and stability properties of cross tube structure under three kinds of cabling schemes are compared and analyzed. The selection of the constraint conditions of the bearing is studied, and finally, the better cabling scheme and the constraint form of the support are put forward, and the overall structure is systematically studied. In this paper, the mechanical characteristics of the prestressing fork tube structure with the drop down cable are studied, and then the parameters of the cable are analyzed and compared with the change of the relative parameters of the uncabled structure. The static behavior of prestressed single-layer crossed tube latticed shell with cable under the optimal cabling scheme is analyzed, and the regular conclusion is drawn. The nonlinear buckling modes of single-layer latticed shell structures with and without cables are analyzed, and then the geometric nonlinear stability ultimate bearing capacity of single-layer cantilever latticed shells with prestressed cables is studied through large-scale parameter analysis. On this basis, the influence of the non-uniform distribution of loads and initial defects on the overall stability of the structure is further studied. Finally, considering the geometric nonlinearity, the influence factors of material nonlinearity are added. Based on the analysis of the stability of prestressed single-layer latticed shell with cable under double nonlinearity, the plastic reduction coefficient of single-layer latticed shell with prestressed cable is proposed based on the analysis results and the probability statistics method, which provides a reference for practical engineering. The influence of support displacement and support stiffness on the stability of cable prestressed single-layer cross tube latticed shell structure is studied. The ultimate bearing capacity and load-displacement curves of the structure are analyzed under the influence of support horizontal stiffness and other factors, and the engineering references are put forward.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399
本文编号：2168947
[Abstract]:The cross tube structure is a kind of spatial structure which is obtained by intersecting several cylindrical reticulated shells. The intersecting ridge or valley line of the cylindrical surface and special boundary conditions make the cross tube latticed shell have unique force transfer path and structural performance. However, the valley line of the latticed shell is the place where the force flow converges, which limits the application and development of the cross tube structure. The application of cable prestressing technology in spatial grid structures has developed rapidly in recent years. The introduction of prestressed technology into spatial grid structures can unload most of the members of latticed shells and improve the stress state of the structures. The strength amplitude of member material can be used many times. The combination of cable prestress technology and fork tube structure can improve the mechanical properties of the cross tube structure, expand the scope of application and improve the economic efficiency of the structure. Therefore, this paper synthesizes the theoretical research and engineering examples of plane arch, space rigid frame, cylindrical reticulated shell and spherical reticulated shell with cable prestressing technology in recent decades, and combines with the mechanical characteristics of cross tube latticed shell structure. In this paper, a variety of prestressed cable cabling schemes are put forward, which are suitable for the cross tube latticed shell structure. The best cable arrangement scheme is selected through the performance analysis of the system. The nonlinear static and stability properties of single-layer cantilever latticed shell with pull down cable are studied systematically, and the effects of support displacement and support stiffness on the stability of the structure are also studied. The main work of this paper is as follows: firstly, three kinds of cabling schemes are proposed for single-layer valley line cross tube latticed shell, and the static and stability properties of cross tube structure under three kinds of cabling schemes are compared and analyzed. The selection of the constraint conditions of the bearing is studied, and finally, the better cabling scheme and the constraint form of the support are put forward, and the overall structure is systematically studied. In this paper, the mechanical characteristics of the prestressing fork tube structure with the drop down cable are studied, and then the parameters of the cable are analyzed and compared with the change of the relative parameters of the uncabled structure. The static behavior of prestressed single-layer crossed tube latticed shell with cable under the optimal cabling scheme is analyzed, and the regular conclusion is drawn. The nonlinear buckling modes of single-layer latticed shell structures with and without cables are analyzed, and then the geometric nonlinear stability ultimate bearing capacity of single-layer cantilever latticed shells with prestressed cables is studied through large-scale parameter analysis. On this basis, the influence of the non-uniform distribution of loads and initial defects on the overall stability of the structure is further studied. Finally, considering the geometric nonlinearity, the influence factors of material nonlinearity are added. Based on the analysis of the stability of prestressed single-layer latticed shell with cable under double nonlinearity, the plastic reduction coefficient of single-layer latticed shell with prestressed cable is proposed based on the analysis results and the probability statistics method, which provides a reference for practical engineering. The influence of support displacement and support stiffness on the stability of cable prestressed single-layer cross tube latticed shell structure is studied. The ultimate bearing capacity and load-displacement curves of the structure are analyzed under the influence of support horizontal stiffness and other factors, and the engineering references are put forward.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399
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