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Compared with the existing finite element eigenanalysis method[8]for asymptotic fields near the crack tip, current method has the following several characteristics: The jump-off that educes the virtue work formula is different; when solving the characteristic formula with FEM, the form of the element is non-confirming element; the singular transformation technique is not used in the assumption of displacement fields surrounding the wedge tip.

该方法与过去的有限元特征分析方法[8]相比的显著特点是：导出虚功原理的出发点不同；有限元单元形式为非协调元；楔形体端部邻域内的位移场假定没有采用奇异变换技术。

Then skin friction on the pile can be predicted. By comparing with FEM analysis and the measured data in site, the simplified method is verified and is convenient to be used in engineering design.

与有限元分析和现场实测结果的对比表明该简化方法具有较高的准确性，可以方便地应用到工程实际。

The primary studying works and characteristics:1 To summarize reinforcing theory of cement mixing pile composite foundation2 To analyze the primary mechanics characters and changing rules of cement mixing pile, based on analysis of test data both indoor and outdoor.3 To discuss siding frictional resistance, ending resistance, ultimate bearing capacity of simple mixing pile and effectiveness factor of grouped piles, loading ratio of soil between piles under cushion cap of grouped piles and stress ratio of pile and soil and so on, and use many computation method and experimentation method to ensure bearing capacity of mixing piles composite foundation.4 To point out and analyze eight sides flaws and problems of the bearing capacity calculation method of mixing pile compositefoundation which ensured by national and normative method/ formula.5 To apply test results of loading tests and a few settlement observation data, use gray theory to predicate ultimate bearing capacity of deep mixing piles, actual example demonstrate engaging between theoretical predicted value and actual value.6 To apply groovy layerwise summation method to discuss entity piles method, double foundation method, equivalent layerwise summation method and consolidation theoretical method and so on, especially by combination of engineering example, use FEM to calculate or discuss the settlement and changing rules of composite foundation.7 To discuss problems of critical length of composite foundation by combination of engineering example and numerical analysis method, and analyze the contrast of critical length between simple pile load and most area load of composite foundation, not only critical length of composite foundation is relative to modulus ratio between piles and soil, but also upside load distribution area of composite foundation.

主要的研究工作与特色为：(1)总结了水泥搅拌桩复合地基的加固原理；(2)在对室内外试验资料进行统计分析的基础上，系统分析了搅拌桩水泥土的主要力学特性及其变化规律；(3)探讨了搅拌单桩的侧摩阻力、端阻力、极限承载力及群桩效率系数、群桩承台下桩间土荷载分担比及桩土应力比等，提出用多种计算方法并结合试验方法来综合确定搅拌桩复合地基的承载力；(4)明确指出和分析了按国家有关规范的方法确定搅拌桩复合地基承载力所存在的八个方面的缺陷与问题；(5)利用过去没有加载至破坏阶段的载荷试验成果和较少的沉降观测数据，尝试了用灰色理论预测深层搅拌桩的极限承载力，实例表明理论预测值与实测值吻合较好；(6)在常规分层总和法的基础上，探讨了复合地基沉降计算的实体墩基法、双层地基法、等效作用分层总和法、固结理论法等，特别是结合工程实例，用有限元数值计算等方法计算和讨论了搅拌桩复合地基的沉降及其变化规律；(7)结合工程实例，用数值分析方法探讨了复合地基临界桩长的问题，指出和分析了单桩荷载下的临界桩长与复合地基大面积荷载下的临界桩长存在很大的差别，复合地基的临界桩长不仅与桩土模量比有关，而且与复合地基上部荷载分布面积有关。

On base of the study, 3D rigid-plastic FEM simulation system of tube spinning is developed. The system, in which modularized structure is adopted, has perfect preprocessing and post-processing function as well as upper automatic degree.

在上述研究的基础上，研究开发了强旋成形三维刚塑性有限元模拟系统，系统采用了模块化结构，具有完善的前后处理功能和较高的自动化程度。

In the present study, the FEM model of non-symmetric spinning has been established and the spinning process has been simulated, which reveals deformation characteristics of non-symmetric tube spinning.

文章建立了三旋轮非对称强旋的有限元计算模型，通过对非对称强旋的三维刚粘塑性有限元数值模拟，揭示了非对称强旋的变形特点。

A knowledge-based process design system for tube spinning has been established, and based on rigid plastic FEM, the method of knowledge acquisition has been discussed.

结合筒形件旋压工艺过程，建立了相应的智能设计系统。

Based on the deep analysis of finite element method and process characteristics of tube stagger spinning, through further development of the general FEM software-MSC/MARC, the three dimension plastic-elastic finite element model is founded.

本文在对有限元基本理论和筒形件错距旋压工艺特点进行深入分析的基础上，通过基于MSC／MARC的二次开发，建立了筒形件错距旋压的三维弹塑性有限元模型。

On the basis of the FEM simulation results, the forming mechanism of tube stagger spinning is studied. The studied mainly include the stress and strain distribution law, the influence of key process parameters on the spinning forces and diameter dimensions, and the main simulation defects.

主要的工作包括：应力应变分布规律研究；关键工艺参数对旋压力、内径尺寸精度的影响规律研究；以及对旋压模拟中的损伤缺陷、不贴芯模缺陷和隆起缺陷的产生原因和防上措施的研究。

In order to ensure sensitivity and precision of transducer of spring beam,according to "stress concentration" design philosophy,based on reasonable choice of transducer,its strain and strength are calculated using FEM,the paster place of spring beam should be ascertained in reason,and the transducer's maximum strain orientation and measuring range are determined theoretically.

采用弹性梁对旧式液压万能材料试验机下横梁进行改造，为确保弹性梁传感器的灵敏度和精度，根据应用"应力集中"的设计原则，在合理选择传感器结构基础上，采用有限元法对其应变和强度进行计算，合理确定弹性梁的贴片部位，从理论上确定传感器的最大应变方位及传感器的量程。

So, the factor of shear lag of box girder is researched by using the principle of the stationary value of the total potential energy, FEM and model test.

针对箱梁剪力滞效应研究不完善的现状，本文对箱梁剪力滞效应应用最小势能原理、有限元法和模型试验进行研究，并探讨了剪力滞效应的影响因素。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。