BeamElementmm　为生成二维平面梁单元的一致质量矩阵
BeamElementStiffness　为生成二位梁单元刚度矩阵
BeamElementStiffness　为组装刚度矩阵和质量矩阵的程序
本程序可以进行有限元模型修正和结构损伤识别，优点是基本解决了测量信息有限的问题。(BeamElementmm is a consistent mass matrix for generating two-dimensional planar beam elements
BeamElementStiffness is used to generate the two-beam element stiffness matrix
BeamElementStiffness is a program for assembling stiffness matrices and mass matrices
This program can perform finite element model correction and structural damage identification. The advantage is that the problem of limited measurement information is basically solved.)