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大跨空间结构属于缺陷敏感性结构形式,在进行地震动输入时需要考虑时空相干性对结构动力响应的影响。为分析这类结构的动力稳定性,将随机振动方法和时程分析方法结合,将包含了场地统计规律的功率谱函数转化为时程分析方法的荷载输入,人工合成具有概率意义且考虑空间相干性的地震波,对实际工程中的大跨空间结构进行多点输入。结果表明:多点输入下的地震相干效应使结构失稳峰值加速度明显小于一致输入对应的失稳峰值,该方法适用于大跨度空间结构的动力稳定分析。
The long-span space structure belongs to the defect-sensitive structure, and the influence of space-time coherence on the dynamic response of the structure needs to be considered in the input of ground motion. In order to analyze the dynamic stability of this kind of structure, the random vibration method and the time-history analysis method are combined to convert the power spectrum function containing the statistical rule of the field into the load input of the time-history analysis method. The artificial synthesis has probability significance and considers the spatial coherence Seismic waves, the actual project of large-span spatial structure of multi-point input. The results show that the seismic coherence effect under multi-input causes the peak acceleration of structural instability to be significantly smaller than that of uniform input. This method is suitable for dynamic stability analysis of long-span space structures.