There are two contents in this paper : one is solve the control differential equation of box girder " s shear lag by dq method , the other is rules of the shear lag for single - box - multiple - cell box girders . first we introduce what is shear lag and the status of research ; we introduce dq method and use dq method to solve several bridges in the third chapter ; also we introduce the software - ansys and analysis several bridges by ansys in chapter iii ; in chapter iv we assume several bridge models and get the stress distribution under concentrated load and distributed load ; we summarize the paper in chapter v and propose the advancing direction of shear lag 文章首先介绍了剪力滞定义及目前研究情况；第三章介绍了dq法以及用dq法解箱梁剪力滞控制微分方程的几个实例，说明了dq法在求解变截面箱梁剪力滞中的优势；第四章介绍了有限元软件ansys ，以及用ansys分析桥梁受力情况的几个例子，说明了用ansys中相关单元分析桥梁的可行性：第五章构造单箱双室、三室、四室的悬臂梁、简支梁模型，分别分析了他们在集中荷载、均布荷载作用下的受力情况。
Chapter one begin with a problem that city planners would encounter when compiling the master planning of city , analysis the phenomenon of lack relations between the development and planning , adopt the data of " permit of development " , then present the concept of " unit block analysis " , and bring out the " real - time tracking " to the city development , and then , demonstrate the feasibility of this approach . the second chapter reviewed a summary of related researches and practices in this field domestic and abroad and then , there follow the history of evolution of the city structural layout in hangzhou . 第一章为绪论部分，从当前做规划设计时碰到的一个问题切入，对现在杭州城市用地发展存在的规划和实施两个范畴相互之间缺乏反馈机制这个现象进行分析，采用了2000 - 2003年建设用地规划许可证的研究数据，提出对城市建设用地的发展进行区块单元分析的模型和研究方法，从理论和实践两方面论证这种方案的可行性和将会给城市规划提供参考依据的意义。
Which often produces some unexpected problems , such as prolonging time limit of project , increasing engineering quantities and cost , etc . through test on the site , dynamic value analysis , finite element unit method , the paper researchs construction technology of in - situ pile , transfer theory , thickness of supporting layer of head slab and depth of pile in karst area , provides some important conclusions , directs effectively the design and construction of this kind of projects 但因溶洞的分布规律性差，现有勘探手段难于事先查明它的准确位置及大小，因而常常给施工带来意想不到的问题：工期延长、工程量增加及工程费用增加等。本文通过现场试验、理论计算和有限单元分析，对岩溶地区钻孔灌注桩的施工工艺、荷载传递机理、持力层顶板厚度及嵌岩深度等方面进行了较为系统的研究，得出了一些重要结论，有效地指导了该类工程的设计和施工。
Thirdly , to improve the application of light gauge steel structure in our country , some experimentations of institute of new - style steel structure which adopting native productions are induced nally , three - dimensional finite element model is presented . compared with the tests , mumerical results are verified much accurate and efficient , therefore a reliable way is provided to utilize the computational technique adequately to reduce the tests and to utilize the experimental results adequately to improve design quality , ( 3 ) study on floor system . not only adequate strength , stiffness and integer stabilization must be provided , but also insulation , fire and acoustics must be satified 本文首先论述了lgsfcbw各种破坏模式及其原因，总结了各因素对lgsfcbw抗剪性能的影响，从而为我国引进和应用轻钢龙骨结构体系奠定了基础；其次从试验模型、试验方法和试验结果三方面探讨了国外lgsfcbw抗震性能的研究，并分析该体系的破坏模式和抗震特性、提出研究建议；然后介绍了为推动轻钢龙骨住宅国产化，我们采用国产材料开展的系列试验；最后提出了lgsfcbw的有限单元分析法，数值计算与试验结果一致，为充分利用计算技术减少试验数量和充分利用试验成果提高设计水平提供了一条可靠途径。
Using the analytic method of the anisotropic element , it is proved that the precondition is unnec - essary to the two finite element spaces - the bicubic hermite rectangular element and the acm element . then the error estimates of the narrow bicubic hermite rectangular element and the narrow acm element for the plate bending problem is obtained . in the end of the paper , numerical results are given 文章中应用各向异性单元分析方法，证明了正则性条件对双三次hermite矩形元和acm元空间是不必要的，从而得到了窄边双三次hermite矩形元和窄边acm元对板弯曲问题的误差估计。
This paper combines the experimental modal analysis technique with the techniques of analytic modal and component modal synthesis ( i . e . external superelement analysis ) provided by msc / nastran to obtain the modal parameters of complex structures . it mainly researches the process of external superelement analysis , required important sentences in msc / nastran and the method inputting modal test results . a t - kind structure and an aircraft mode , as examples , are researched through experimental modal analysis and component modal synthesis 本文的工作重点是将试验模态分析技术与msc / nastran中的解析模态计算和部件模态综合技术结合起来去解决工程实际问题，着重探索了msc / nastran中外部超单元分析的过程和重要语句，以及模态试验数据的输入等问题，并以一个t型结构和某型飞机全机模型为例做了部件模态综合计算。
