The formulation of geometrical non-linear finite element is deduced for analyzing cable-membrane structure. Then the incremental theory of geometrical nonlinearity of linear cable element and plane triangular membrane element on the basis of updated lagrange coordinate are obtained. 本文首先推导了用于索膜结构分析的几何非线性有限元基本列式及基于修正的拉格朗日坐标的两节点直杆索单元和平面三角形常应变膜单元的几何非线性增量理论。
Incremental Implementation of Time-space Coordinate Transformation and Research on the Incremental Time Grating Displacement Sensor 时空坐标转换方法的增量式实现与增量式时栅位移传感器研究
The present paper studies a priori estimates of incremental unknowns methods for Dirichlet problems with space dimensions three. One gets the estimates on a class of special nonuniform meshes which are the same in the three coordinate directions. 文中讨论了三维Dirichlet问题的增量未知元方法的先验估计,这种估计是在三个坐标方向上的部分具有相同的非一致性的特殊情形下得到的。
Differed from cantilever method, the most prominent characteristic of incremental launching method is that the coordinate, supporting condition as well as the corresponding internal force and deformation of the structure are constantly changing during the construction. 顶推施工不同于悬臂施工,其最大特点在于随着施工过程的进行,结构的坐标、边界支承条件以及相应的结构内力、变形等均在不断地发生变化。