索-混凝土组合梁结构自振特性

针对索-混凝土组合梁这一新型结构体系,应用ANSYS有限元软件进行自振特性分析,求出结构的自振频率及相应的振型。而后对索—混凝土组合梁结构的各项参数（包括索截面面积、索初始应变、梁跨度、刚性杆高度）进行了分析,研究其对结构自振特性的影响。研究发现：索—混凝土组合梁结构较柔,刚度偏弱,基频较小;索截面面积对结构自振特性影响不大;索初始应力主要影响结构的前几阶振型;随着梁跨度的增大,结构的频率明显减小,结构变柔,刚度变小;刚性杆的高度主要影响结构的前几阶振型,在实际工程应用中,刚性杆的高度以0.5～0.7 m为宜。

Studyon the Free Vibration Characteristics of the Cable-concrete Beam

Based on the new structure of cable-concrete beam structure, applying of finite element software ANSYS analysis the free vibration characteristics of its framework structure, it makes out the natural frequency and mode shapes Of the structure. Then I research the affection of every parameter of the structure free vibration, which con- rains cable areas, cable initial strains, beam lengths ~md rigid link heights. The results show that the cable-concrete beam structure is softer,the Stiffness is weaker,and the base frequency is smaller;the influence of cable areas to the free vibration characteristics is not much;the front mode shapes of the structure are influenced by cable initial strains ;with the beam lengths incresing, the frequency of the structure obvious reduces,the structure becomes soft, the Stiffness becomes smaU;the front mode shapes of the structure are influenced by rigid link heights,in the actual engineering application, height of rigid link is appropriated for 0.5 m - 0.7 m.