Based on the steel - concrete coordinating relations , element stiffness matrix of geometrically nonlinear analysis , formulas for self - stresses by temperatures and displacements , stresses of corresponding superfluous structures are further studied . furthermore , a new theory and method for structural geometrical nonlinearity and buckling analysis is put forward 根据钢混协作关系进一步推导出钢混组合构件几何非线性分析单元刚度矩阵、温度自应力及钢混超静定结构温度位移和应力的计算公式，建立了一种新的基于钢混协作关系的异种材料组合构件的几何非线性和结构稳定性分析方法。
This dissertation mostly focuses on the theme : the theory study of lateral stiffness of special - shaped column and application on internal force and displacement of special - shaped column frame structure . and getting two formulas : ( 1 ) story lateral stiffness of special - shaped column frame structure . ( 2 ) element stiffness matrix of special - shaped column 得到了二个研究成果： ( 1 )异形柱框架的抗侧移刚度公式； ( 2 )异形截面杆的单元刚度矩阵，并在此基础上，编制了异形柱结构内力分析程序。
Firstly , related to the problem about many kinds of geometric non - linear factors and shear deformation which are not differentiated definitely in a lot of studies , several kinds of beam element stiffness matrices respectively corresponding to geometric non - linear factors and shear deformation are derived as far as planar beam element is concerned and geometric non - linear factors of beam element in frame structure are analyzed systematically 本文首先针对众多研究中对多种几何非线性因素及剪切变形等不加以明确区分的问题，以平面杆单元为例，分别推出与多种几何非线性因素及剪切变形相对应的杆单元刚度矩阵，系统阐述框架分析中杆单元的几何非线性因素。
Firstly , the paper introduces the principle of instituting contact interface element and the format of integral method for element stiffness matrix ; secondly , because of the zero of displacement and load of soil in the infinite boundary , the unique shape of element stiffness matrix is obtained for coupling the three different elements 文中首先阐述了接触元建立的方法以及单元刚度矩阵的积分方法；由于无限远处的土场位移、地震作用力皆为零，计算中对该单元刚度矩阵的形式不同于四节点等参元，文中推导了平行无限元的单元刚度拒阵方，并介绍了无限元单元刚度矩阵组装原理。
It discusses the influence factors of pile groups effect , such as pile space , pile number , pile diameter , pile length and soil parameter etc . subsequently , using linear interpolation function to approximate the soil ' s anti force to piles , the article combines p - y curves with pole system fem . in this way , a new pile - soil interaction element calculated model is designed , the pile - soil interaction element stiffness matrix is deduced , and establishes finite element equation of p - y model , writes the relevant finite element program with matlab language , calculates and analyses pile groups subjected to lateral loads with engineering examples 随后，本文将p - y曲线法与杆系有限元法相结合，采用线性插值函数来逼近土对桩的约束反力，得到新的桩?土相互作用的单元计算模型，推导了桩?土相互作用的单元刚度矩阵，建立了p - y模型的有限元求解方程，用matlab语言编制了相应的p - y曲线有限元法计算程序，进行横向承载桩的计算分析。
Theoretical research based on the quasi - static test such as theoretical analysis in nonlinear finite element method , programs to shape function of isoparametric element of hexahedron with eight nodes and to stiff matrix of elements , application of resilience model in degeneration equation of elastic module of concrete goes along 在试验基础上进行了理论研究，用非线性有限元方法分析框架，编写了六面体八节点等参元形函数、单元刚度矩阵等部分程序，将恢复力模型应用到混凝土弹性模量退化方程中。
Some interface contact models of soil - structure and resolution principles of contact element in universal fem program are introduced . considering the energy dissipation between soil and the box foundation , a modified three dimension goodman contact element is presented , and its element stiffness matrix is derivated . also , some seismic response analysis which in different max acceleration features are presented by using spring in marc program for simulating the modified contact element 4 、介绍了目前几种土与结构接触面常用的界面模型,以及一些大型通用有限元软件的接触单元计算原理,然后在前人研究的基础上考虑土-箱基动力相互作用中的能量耗散,计入阻尼成分,提出了一种改进的goodman三维土-箱基接触单元,并推导了相应的接触单元的单元刚度矩阵。
This paper presents the element stiffness matrix and equivalent node force of the variable cross - section bar . so the approximation in structural analysis is avoided , and the calculation capacity of equivalent frame method is also developed . this helped the engineers avoid the fem , which consume much time and is difficult to master 本文对板带宽度变化的板柱结构推导了变截面直杆单元的单元刚度矩阵和等效结点荷载列阵，避免了在结构分析时所作的近似，也扩大了等代框架法的计算范围，使工程技术人员免于使用占用机时、难于掌握的有限元分析法。
In this paper , a generalized hybrid finite strip method is deduded for analyzing the shear lag effect in box girders . it has the advantage of the generalized finite strip method and hybrid stress element . shear lag effect in thin - walled box girder is analyzed with this method and stiffness matrix of generalized hybrid finite strip element is deduced . a calculating program for thin - walled box girder " s generalized hybrid finite strip method is compiled with fortran language and performed in visual fortran environment of pc computer . a typical example demonstrates that the proposed method has higher accuracy and efficiency , is suitable for analysis of shear lag effect in box girders 本文结合应力杂交元法和广义有限条法导出一种用来分析箱梁剪力滞效应的广义应力杂交有限条法，它兼有应力杂交元和有限条法的优点。运用这种方法对薄壁箱形梁的剪力滞效应进行了分析，推导出广义应力杂交有限条元的单元刚度矩阵，用fortran - 77语言编写薄壁箱形梁广义杂交有限条法程序( hfsbg . for )在visualfortran环境下运行。具体算例的数值结果表明：广义应力杂交有限条法用于计算箱形梁的应力分析具有很好的精度和效率，适合于分析箱形梁的剪力滞效应。
The fixity factor is identified by bp neural network the fem correction method of truss structure based neural network technique is developed in this paper , and transient dynamic analysis is used on the fem . thirdly , the optimizational layout for acceleration transducer and the actual measured method for the modal parameter of the truss structure are also discussed in this paper and the accuracy of the fem correction is verified by the finite element transient dynamic temporal analysis , according to the research of this paper , bp neural net can be well adapted to structural fem correction 建立了以固结系数表示的三维空间有限元模型，根据单元刚度矩阵中的固结系数的变化，建立固结系数与结构动力特性的关系，应用bp神经网络，进行结构节点固结系数的识别；研究了用于振动测试的加速度传感器的优化配置与网架结构模态参数的实侧方法，通过在风荷载作用下有限元瞬态动力学时程分析检验了有限元模型修正的精确性。
