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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.
Combined with curved long-span steel structure roof project of Zhenjiang Sports Center, a series of problems in the dynamic analysis of the string structure are studied.Firstly, the paper analyzes the influence of different mass matrix modes (uniform mass matrix and central mass matrix) The influence of the tension and the cable cross-section on the dynamic performance of the chord structure was studied by the dynamic analysis of the structure under the action of multidimensional earthquakes. The results show that different The mass matrix model has a great influence on the vibration mode and frequency calculation results of the single 榀 stringed beam but has little effect on the calculation results of the whole stringed string structure. The changes of cable prestress and cable cross section change the vibration equilibrium position of the string structure , Fluctuating displacement and structural seismic performance.