张弦结构动力分析中的若干问题研究

Some problems of dynamic analysis of beam string structures

结合镇江体育中心会展馆的曲线形大跨度钢结构屋盖工程,对张弦结构动力分析中的若干问题进行了研究.首先分析了不同质量矩阵模式(一致质量矩阵和集中质量矩阵)对单榀张弦梁及整体张弦结构振型、频率的影响;其次,通过多维地震作用下的结构动力分析,研究了索张拉应变和索截面变化对张弦结构动力性能的影响.研究表明,不同的质量矩阵模式对单榀张弦梁的振型、频率计算结果影响较大,而对整体张弦结构的计算结果影响较小;索张拉预应力及索截面的变化改变了张弦结构的振动平衡位置、波动位移及结构抗震性能.

Some problems of dynamic analysis of beam-string structures are studied combined with the project of Meeting and Exhibition Hall of Zhenjiang Sport Center.First,the influence of different mass matrix modes（including lumped and consistent mass matrix） on natural frequency and mode shape are studied.Then,based on dyamic analysis of beam-string structure under multi-component ground motion excitation,the influence of different cable tensile strain and cross sectional area on dynamic performance of beam string structure is analyzed.The results show that mass matrix mode greatly affects dynamic performance of single beam string but makes little effect on integrate structure system.The variation of cable prestress level and cross-section area change the vibration balance position,displacement fluctuant extent and seismic performance of beam string structure.