桁架结构

Considering the axial symmetry of the structure, the computation model can be simplified as a planar truss.

考虑到该结构是一种轴对称结构，将结构简化为半榀平面桁架，采用节点平衡理论进行分析。

Membrane structures can be divided to: Structure forms: including hanging system canting pull system tensioned membrane structure etc.

按照结构形式索膜结构可分为悬挂体系斜拉体系张弦拉屋架平面索桁架单层索网空间索网格整体张拉结构和张拉膜结构。

In this dissertation, the roof of certain tube-truss gymnasium was studied, we can find that the arrangement of the structure is reasonless, and the unsubstantial shore can not stand the large counterforce at the end support.

本文通过对某中学体育馆管桁架屋盖结构进行分析，发现了原方案在结构布局上不合理，且下部较薄弱的支撑柱难以承受较大的支座反力。

Secondly, the construction simulation were performed by the model in ANSYS. The effect were emphasized in the construction process, which induced by temperature, geometric nonlinearity, and boundary condition. The conclusions were given that the stress decreased thirty percent for temperature change 10℃, and decreased fifteen percent for considering the elasticity support.

基于单元生死法施工模拟原理，运用ANSYS有限元软件建立了体育馆屋盖模型，进行了施工过程数值模拟，重点探讨了温度效应、几何非线性及支承条件对结构受力性能的影响规律，同时指出支承柱临界截面的存在，温度效应和边界条件变化对网壳结构边桁架杆件受力影响最为显著，温度变化10℃影响达30%，考虑支承弹性的影响在15%以上。

Aim at the special structure form for the first time used of the long span space truss and cross inhaul cable of the Guangzhou gymnasium light steel roof, supply the theoretical basis for the construction, therefore, improved feasibility and advanced nature of construction scheme greatly, and gained very good economic and social benefit.

5针对广州体育馆大跨度空间桁架+交叉支撑拉索轻型钢结构屋盖这一国内首次使用的结构形式，加之构件几何尺寸细小、刚度小、稳定性差，安装和拆除过程中各工况内力变化复杂且相互影响的技术难题，运用虚拟建造技术对施工方案中八大难题进行仿真分析，为实际施工提供科学的理论依据，大大提高了施工方案的可行性和先进性，取得了很好的经济和社会效益。

In the program the Newton-Raphson's method is used to iterative computation; and the method of either the cylinder-arc-length or the minimum residual displacement is adopted to control the iterative process.

在分析非线性静力和动力有限元计算方法的基础上，本文采用修正的Newton-Raphson方法进行迭代计算，并采用柱面弧长法和最小残余位移法控制迭代过程，编制了一个适合于杆件体系结构的有限元分析程序，结构可以按桁架、刚架或梁杆组合体系分析。

Combining the fully stressed optimality criterion with finite element analysis, the material distribution is optimized after several iterations.

采用满应力准则法，借助有限元结构分析，经过少量迭代，建立优化的材料连续分布场，即类桁架连续体结构。由于首先建立的拓扑优化结构是各向异性连续体，从而得到更大优化空间。

Based on considering seven types of load combination,static performance of roof structure with steel tube truss of one gymnasium was analyzed.

通过考虑7种不同的荷载工况组合，对某体育馆的钢管桁架屋盖结构进行静力性能分析，从而得到了结构杆件的内力分布、支座反力及整体结构的变形情况。

After studying the curve of the vibration frequencies, which are varying with the changing of the structural parameters such as the rigidity of pier, the rigidity of straining beam, the rigidity of truss, the high of pier, the width of deck, and so on, some rules about the changing of vibration frequencies and the influencing of the structure that vary with the parameters were achieved.

研究了桥墩刚度、横系梁刚度、桁架片刚度、桥墩高度、桥面宽度等参数对结构动力特性的影响，通过对结构的自振振型及频率进行相应分析，得出结构参数变化对结构的横向刚度、竖向刚度、纵向刚度和扭转刚度及其他动力特性的影响程度及规律。

This papaer presents a new structure,which is compound large span structures of Γ frame parabolical three hinged arch space truss.

提出一种新型屋架结构——Γ型柱抛物线三铰拱空间桁架组合大跨结构，导出了该结构有关的设计计算公式。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。