A Study on Nonlinear analyses of Frame Structures To A Refined Extent Using An Superconputer

1.通过利用钢框架结构的特殊形状，只要假定上述条件，就可以对钢框架结构的杆件进行分析，从而在相当精确的程度上解决各种非线性问题.钢筋混凝土框架结构分析可以采用有限段法，该方法考虑了梁柱节点的剪切变形以及梁、柱和梁柱节点之间钢筋的连续性。非线性方法是在增量势能驻值原理的基础上发展起来的增量方法.采用基于梁理论的弹塑性分析方法对型钢混凝土结构进行分析，可以清楚地了解型钢混凝土结构各构件的应力分布和受力性能.本文建立了非线性结构分析中计算失稳结构的方法。该方法是一般非线性有限元法的改进.本文给出了板壳几何非线性问题的有限元列式和算法。该算法的一个独特之处是使用了一个新的选择性积分和有限变形本构方程的9节点拉格朗日四边形单元。

1. Members of steel frame structures could be analyzed, always provided that the aforsaid-conditions can be assumed, to a considerably refined extent in relation with various nonlinear problems through utilizing the particular shape of the frame stvucture.2. Reinforced Concrete frame construction could be analyzed using finite segment method which considers the shear deformation of beam-column joints and the continuity of reinforcing bars among beam, column and beam-column joint. The ron-linear methad is the incremental method, which has developed on a basis of the stationary principle of incremental potential energy.3. Steel reinforud concrete (SRC) construction cold be analyzed using an elestic and plastic analysis method bazed on the beam theory, and the distribution of stress and the behavior of each component member of SRC structure could be made clear.4. The authov has established a method to cslcurate an instable structure in nomlinear stvuctural analysis. This method is an impraved version of ovdimary nonlinear finite element method.5. A finite element formulation and algovithm for geometrical nonlinear problem of plates and shells is preseuted. A unique feature of this algorithm is the use of a 9-node Lagragian quadrilateral element with new selective integration and a finite-detormetion constitutive equation.