【摘要】 以顶部带有 2层钢框架的北京机场控制塔台的振动台试验模型为计算对象 ,采用基于振型叠加的结构地震响应时程分析法 ,计算了该高耸塔台模型在地震作用下各个振型的时程反应 .计算中采用了Rayleigh阻尼 ,由于结构是钢钢筋混凝土结构 ,振型阻尼比不易确定 ,在本次计算中振型阻尼比取振动台试验测出的第 1阶和第 2阶振型阻尼比 .结果表明高振型对塔台结构的最大位移的影响不大 ,但高阶振型对塔台结构地震剪力的影响却不容忽视 .将计算结果与试验值进行了对比分析 ,验证了所得结论的正确性 .更多还原

【Abstract】 The seismic response of each vibration mode of the high-rise tower model is obtained based on a mode-superposition time-history analysis method with respect to the control tower with a steel frame top at the Beijing airport. The Rayleigh damping is assumed in the analysis with the modal damping ratio taken as the first modal and the second modal damping ratio measured in the shaking table test due to the steel-RC composite structure. The calculation results reveal that the high-order modes contribute a little to the seismic displacement of the tower; however, the high-order modes play an important role in the seismic shear force of the tower. The analysis of the calculation results compared to the test results verify the correctness of the conclusion presented in this paper.更多还原