有限元内力分析的截面网格自动生成技术

针对进行复杂空间结构分析时需要分析其多个截面上的内力,而应用有限元内力法分析时人工准备截面信息难度大的情况,通过对有限元网格进行分析,利用网格的空间几何关系,提出了由计算机自动生成求解有限元内力所需截面信息的方法。结合有限元内力法求得截面上结点的约束内力,进而求得截面上的结构内力(轴力、剪力、弯矩)。通过对各截面交线的处理,将结构内力值以工程需要的形式在截面上表示出来,方便了工程技术人员参考使用。

Technology of mesh auto-generation in cross-section for internal force analysis with FEM

It is necessary to investigate the internal forces in multiple cross-sections for analysis of complicated spatial structure;however,it is difficult to obtain the information of cross-sections in internal force analysis with FEM.Based on the analysis of the geometric relationship of finite element meshes,a method of auto-generation of information about cross-sections by computers,which is necessary for solving the internal forces with FEM,is proposed.With this method,the internal constraining forces at nodes of the given sections are obtained,and then,the structural internal forces of the given sections,including the axial force,shear force and bending moment,can also be obtained.By dealing with the intersecting lines of the sections,the structural internal forces are expressed in specified forms in the cross-sections which are suitable for engineering projects and convenient for technical personnel.