拉索预应力柱面巨型网格结构稳定性能分析

利用ANSYS有限元软件,对两种不同布索方式的预应力柱面巨型网格结构进行了特征值屈曲分析,讨论了主体结构矢跨比等参数对结构稳定承载力的影响,得到了一些可供参考的结论。     

柱面网壳结构动力稳定性分析

利用ANSYS软件中的动力分析程序,研究了柱面网壳结构在地震作用下失稳时,静荷载和杆件局部失稳对结构整体失稳的影响程度,并通过计算分析,得出了一些有益的结论。     

半刚性连接网壳结构的有限元分析

建立了半刚性连接网壳结构的有限元模型,推导了考虑节点柔性的三维梁单元刚度矩阵,并对单元的固端力做了修正.在此基础上编写了相应的用户子程序UEL,该程序可以对半刚性连接的网壳结构进行节点位移和杆件内力的计算分析.算例验证了本文所提出的模型及所编程序的正确性,最后分别对单层和双层网壳结构进行了半刚性节点分析,通过计算得到了一些有益于指导网壳工程设计的重要结论.     

Experimental research and finite element analysis of plate-cone cylindrical reticulated shell

为研究板锥网壳结构的实际承载能力和破坏全过程，了解结构的受力性能和整体刚度，对板锥柱面网壳结构进行模型试验研究。对试验模型的细部构造进行设计，确定上弦节点、下弦节点、支座节点、锥体成形及连接构造。对两纵边支承的试验模型在正常荷载工况和破坏荷载工况下进行加载试验，并采用ANSYS软件对试验模型进行非线性有限元分析。结果表明：板锥柱面网壳的整体刚度大，在正常荷载模式下，结构的变形很小，最大竖向位移与跨度的比值为1/3787，弦杆的受力主要是沿拱轴方向传递；在破坏荷载模式下，锥体的节点板连接处率先发生局部屈曲，之后焊点破坏，结构丧失承载能力。有限元与试验所得承载力最大误差为11%，破坏模式基本一致，所用有限元分析方法可靠。     

板锥柱面网壳结构的试验研究与有限元分析

为研究板锥网壳结构的实际承载能力和破坏全过程,了解结构的受力性能和整体刚度,对板锥柱面网壳结构进行模型试验研究。对试验模型的细部构造进行设计,确定上弦节点、下弦节点、支座节点、锥体成形及连接构造。对两纵边支承的试验模型在正常荷载工况和破坏荷载工况下进行加载试验,并采用ANSYS软件对试验模型进行非线性有限元分析。结果表明：板锥柱面网壳的整体刚度大,在正常荷载模式下,结构的变形很小,最大竖向位移与跨度的比值为1/3787,弦杆的受力主要是沿拱轴方向传递;在破坏荷载模式下,锥体的节点板连接处率先发生局部屈曲,之后焊点破坏,结构丧失承载能力。有限元与试验所得承载力最大误差为11%,破坏模式基本一致,所用有限元分析方法可靠。     

Finite element analysis and structural design of pretensioned inverted T-beams with web openings

This paper presents the results of a research project aimed at providing standard circular web openings to the popular precast pretensioned inverted T-beam. Opening size and placement and required materials strengths were investigated. In this paper the nonlinear analysis and design of simply supported pretensioned inverted T-beam with circular web openings are presented. Two design parameters are varied: opening location and number of openings. The results from nonlinear finite element analysis were substantiated by test results from five pretensioned inverted T-beams with web opening and one solid beam. Good agreement is shown between the theoretical and the experimental results. The test results obtained from this investigation show that the performance of the specimens with web openings is almost identical to that of the specimen without web openings. A simple design method for pretensioned inverted T-beam with circular web openings is proposed.     

不同类型单层网壳的静力稳定分析

利用ANSYS结构分析软件对三种球面网壳进行了研究,分析了在均布荷载作用下模型的静力变形规律,并对各网壳的刚度,极限荷载进行了对比,结果表明,凯威特网壳结构稳定,受力合理,值得推广。     

Static properties and stability of cylindrical ILTDBS reticulated mega-structure with double-layer grid substructures

For the cylindrical intersecting-latticed-three-dimensional-beams-system (ILTDBS) reticulated mega-structure with double-layer plane-plate grid substructures, the configuration, form parameters, the support styles of the main structure, and the support ways of the substructures on the main structure are analyzed firstly in this paper. Then the geometrically nonlinear mechanical model and corresponding stability analysis procedure are developed, and the structural stability including buckling modes, ultimate loads under different kinds of conditions and a series of parametric analyses are researched. Moreover, the general failure conditions of the structure are discussed. Finally the basic static properties of the structure are investigated, and a series of parametric analyses with respect to static properties of the structure are performed. All this work will provide theoretical guidance to the actual engineering application of this structure.     

静力触探机理的有限元模拟分析

运用有限元分析软件,建立Drucker-Prager模型,并采用初始半径的转换方法对圆柱孔穴扩张过程进行模拟分析,得到饱和软土静力触探贯入过程的位移、应力和应变的变化规律。     

边坡稳定的有限元分析

为准确掌握边坡的受力特点,采用有限元强度折减法对高速公路边坡进行了稳定性分析,计算得到边坡的内力和位移的分布情况,并确定出边坡的安全系数,最后将计算结果与传统方法进行了对比,表明了该方法的可行性。     

双轮铣转台有限元静力分析

本文在对双轮铣的作业特点进行分析的基础上,选取脱困和起臂两个典型工况对转台进行受力分析,建立了力学模型,并应用有限元软件ANSYS Workbench进行静力分析,得到了转台的应力和应变云图,揭示了转台的应力分布情况,找到了转台在结构设计上的薄弱环节和富余部位,为结构进一步优化和减重提供了理论依据.     

铁路路桥过渡段长度有限元静力分析

建立了有碴轨道结构路桥过渡段的有限元计算模型,利用ANSYS有限元分析软件,计算了在静力作用下,不设置过渡段和过渡段长度分别为10m,20m和30m时,钢轨的位移和转角,提出了确定过渡段长度的部分理论依据。     

圆柱形网壳的塑性极限分析

本探讨了圆柱形网壳结构的塑性极限分析，在分析过程中，采用拟壳法将圆柱形网壳结构等效为连续的夹层壳，然后对等效夹层壳进行塑性极限分析，由于夹层壳结构的极限条件是线性的，因而在求解时问题得到了大的简化，鉴于有矩理论的复杂性，本在作极限分析时，采用了无矩理论和半无矩理论的平衡方程分别作为中短壳和长壳的平衡方程。     

浸水路堤稳定性有限元分析

通过有限元模拟计算了水位升降变化对浸水路堤变形和稳定的影响,计算分析表明,水位升降对浸水路堤变形和稳定性的影响,主要是路堤外静水压力和路堤内渗流的破坏性作用,得出了在浸水路堤工程实践中,控制路堤外水位、阻止路堤内渗流作用有利于浸水路堤的稳定的结论。     

钢—混凝土组合梁单调静力性能有限元分析

利用ANSYS软件建立了钢—混凝土组合梁的有限元模型,并对其进行了非线性分析,通过与试验结果的对比验证了建模方法的正确性,在此基础上,分析了栓钉间距、有效预应力等参数对钢—混凝土组合梁静力性能的影响,以期为钢—混凝土组合梁的设计计算提供指导。     

Research on stability of single-layer inverted catenary cylindrical reticulated shells

The structural configuration and method of analysis of the single-layer inverted catenary cylindrical reticulated shell are introduced in this paper, and the elastic as well as elastic–plastic stability of this kind of reticulated shell is then investigated. The stability of the structures with different types of grid patterns is compared, and the reasonable grid pattern is hence recommended. The structural buckling mode and ultimate load-carrying capacity are studied in detail by parametric analysis. Influence of various factors on structural ultimate load is investigated, and the fitting formula of ultimate load is thus presented. Comparison analysis between the inverted catenary and circular cylindrical reticulated shells is also carried out. The work will provide guidance in theory for practical applications of this kind of structure.     

Finite element analysis of the stability of multilayer elastomeric bearings

The stability of multilayer elastomeric bearings is considered within the framework of two-dimensional finite elasticity. For this purpose, simple constitutive equations which generalize those of a transversally isotropic linear elastic solid are considered. A finite element formulation is discussed which is capable of accounting for very general boundary conditions. For moderate deflections and classical boundary conditions this formulation leads to numerical results in close correspondence with those obtained by Haringx's one-dimensional treatment. It is shown that the presence of boundary conditions in the form of unilateral constraints explains a softening effect which has been experimentally observed during the testing of this type of composite column. Experimental results are also presented which indicate that this softening effect is not produced by a form of material instability. These experimental results provide further justification for the simple constitutive model adopted.     

多层粘钢加固钢筋混凝土梁的有限元静力分析

基于叠层梁模型，提出了一种考虑了粘结层影响的多层粘贴钢板加固的钢筋混凝土梁的有限元模型，并用MARC软件对在对称集中静载作用下的开裂载荷，变形与应力进行了仿真分析。     

西南某铁路便道边坡稳定性的有限元分析

结合西南某铁路便道边坡的工程概况,采用ABAQUS有限元分析软件,对铁路便道边坡的稳定性进行了有限元分析,并基于强度折减法,获得了该边坡的安全系数,确定了滑动面位置,进而为边坡防护与加固设计提供了参考,并给出了相应的加固处治建议。     

打桩架回转平台的静动态有限元分析

在Pro/E软件中建立某打桩架回转平台的三维实体模型,运用HyperMesh软件进行有限元分析前处理,建立回转平台有限元模型,并进行静力学和模态分析。得到了模型在两种典型工况下的变形、应力结果和振动特性,并提出了改进意见。