几何结构

Based on the variation with the structural and geometric parameters for a real engineering, dynamic characteristics for a cable-supported lattice shell is studied with the block Lanczos method by means of the finite element model combined with beam elements, truss elements and cable elements.

选用梁元、杆元和索元的组合有限元模型，采用分块Lanczos法，针对一实际工程，通过改变结构参数、几何参数等诸多因素，较系统地研究了肋环型索承网壳结构的动力特性及抗震、抗风性能，对工程应用有一定参考价值。

Aiming at the guided entity model of apiece component, some frame boards of skin, ventro-board and crossbeam is simulated with curve surface, strengthen rib, frame and bars are simulated with curves in this paper, predigesting entity models to geometry models.

在ANSYS中，选取体单元solid45、壳单元shell63、梁单元beam188、质量单元mass21分别对相应的几何模型划分网格，用耦合方程实现23-3航炮所简化的质量元同炮舱结构其它组件的连接，建立了炮舱结构的有限元模型。

In studies of interaction among pile, platform that above it and surrounding soil, this paper employ the concept of plate element to simulate the loading character of platform, and employ the concept of solid element to simulate the character of pile and soil, using the finite element method after understanding the geometry properties of pile, soil and the platform. Analyzing the loading properties of the three entities above and their deformation, this paper also employ a special element, Penalty Element. The introduction of penalty element of this kind has served to guarantee the join harmony of displacement between solid element and plate element, thereby effectively resolving the join problem between platforms, pile that support it and surrounding soil.Considering significant property difference between pile material and its surrounding soil, there may be much shear stress on their contact interface produced under vertical load, thus causing displacement or fission. Therefore it is necessary to adopt one special constitutive law of this kind of contact interface, which can reflect its feature of loading and deformation thoroughly. On the basis of the deformation feature and constitutive laws of some contact interface obtained by Zhang Dongji and people concerned through some single-shear experiments on contact interface between structure and soil, this paper employ one pile-soil three-dimensional constant thickness contact interface model to simulate the " slide" taken place on the interface between pile and its surrounding soil. With this kind model, this paper has also created one finite element model, which can be applied to perform finite element calculation and analyze the pile-loading feature, and deduced its element stiffness matrix.

在承台-桩-土共同作用中，考虑桩与承台的几何特性，采用有限元方法，用实体单元模拟桩土，用板单元模拟承台，更具体地分析桩和承台的受力特性和变形，而且还采用罚单元—既实体单元与板单元之间连接必须满足变形协调条件，来有效地解决了承台与桩土的连接问题，且在桩土共同作用中，由于桩体结构的材料性能与周围土层性质相差较大，在竖向荷载下有可能在其接触面上产生较大的剪应力从而导致错动或开裂，因此，为了充分反映桩土接触面上的受力及变形特征，应采用一种桩土接触面特有的本构关系，即利用张冬霁等人关于结构与土体接触面单剪试验所得到的接触面变形特征及其本构关系，引入桩-土三维等厚度接触单元来模拟桩与桩侧土之间的&滑移&，在此基础上建立可用于桩基承载性状分析的有限元计算单元模型，并推导出了各单元的刚度矩阵。

This level of self-similar structure appropriate to zoom in or out geometry, the same structure as a whole.

这种自相似的层次结构，适当的放大或缩小几何尺寸，整个结构不变。

Such self-similar structure, and appropriate geometric size enlarged or reduced, the whole structure unchanged.

这种自相似的层次结构，适当的放大或缩小几何尺寸，整个结构不变。

According to the geometric evolution of the substitutedcumulenes from the cumulenic-like resonance form to the acetylenic-like (charge-separated) resonance form, it is obtained that there are two kinds ofresonance form of the substituted cumulene.

根据取代累接双键烃几何构型从累接双键烃共振结构逐渐演变到多炔共振结构的过程，给出了取代累接双键烃的两种共振形式。

According to the geometric evolution of the substituted polyynes from theacetylenic-like resonance form to the cumulenic-like (charge-separated)resonance form, it is obtained that there are two kinds of resonance form of thesubstituted polyyne.

根据取代多炔几何构型从多炔烃共振结构逐渐演变到累接双键烃共振结构的过程，表明取代多炔存在着两种共振形式。

First of all, this paper analyzes the distributing situation of sectional temperature of two steel frame models within an hour utilizing the transient thermal analyse module of ANSYS;Secondly, carries on the failure analysis to two steel frame models at high temperature and obtains the fire-resistant limit and critical temperature of steel frame, utilizing the static nonlinear analyse module of ANSYS and considering the influence of geometry nonlinearity and material nonlinearity; Finally, according to the fire-protection designing requirement of structure, deduce a method to computer the thickness of fireprotection layer for steel structure and ask out the thickness of fireprotection layer of two steel frame models according to this method .

首先，利用ANSYS瞬态热分析模块，分析出两个钢框架模型在一小时内钢框架的截面温度场分布情况；其次，利用ANSYS静力非线性分析模块，综合考虑几何非线性及材料非线性影响，对钢框架模型在高温下进行失效分析，分析出两个钢框架的耐火极限及临界温度；最后，根据结构防火设计要求，推导出一种钢结构防火层保护厚度的计算方法，并据此方法求出两个钢框架模型的防火层厚度。

Concept of using geodesics cutting analysis of membrane structure is a complex issue, because the geometry of the novel membrane structure variable ...

用 测地线概念作膜结构裁剪分析的问题之所以复杂，是因为膜结构几何外形的新奇多变。。。。

Under the background of High Power Microwave technology, a novel family of waveguides for high power microwave transmission is proposed. Some other new types of guided wave structures formed by some classical geometrical curves are also explored in this dissertation.

在高功率微波技术日益得到重视的背景下，本文提出了一种新的大功率导波结构——五边形波导族，并对利用经典几何曲线构成的几种导波结构作了探索。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。