The 1st to 12th vibration modes and periods which influence greatly on the truss are listed to investigate the distributions of the truss mass and stiffness.

• 在对该结构体系进行模态分析后，提取对结构有影响的前12阶模态，列出每一阶模态的自振周期及主振型，用于考察结构的质量分布和结构刚度。