The improved modified ensemble empirical mode decomposition (MEEMD) method is used to decompose the long-period ground motion, and the introduction of permutation entropy is used to eliminate the abnormal signal, which can avoid the phenomenon of mode aliasing in the traditional empirical mode decomposition method, so that the components of the long-period ground motion can be accurately separated. Taking the separated and reconstructed ground motions as input action, the influence of long-period components on the seismic response of diagrid structure of high-rise building is studied. The results demonstrate that the MEEMD method can accurately extract long-period ground motion components from long-period ground motion. Long-period ground motion contains abundant short-term energy with low-frequency, which is the main reason for the large seismic response of long-period structure. The seismic response of diagrid structure is closely related to the natural period of the structure and the spectrum characteristics of the ground motion.

采用改进的修正集合经验模态分解（MEEMD）方法对长周期地震动进行分解，并引入置换熵来消除异常信号，避免了传统经验模态分解中模态混叠的现象方法，以便准确地分离长周期地震动的分量。以分离重建的地震动为输入作用，研究了长周期分量对高层建筑斜交网格结构地震响应的影响。结果表明，MEEMD方法可以准确地从长周期地震动中提取长周期地震动分量。长周期地震动含有丰富的低频短时能量，这是长周期结构地震反应大的主要原因。斜交网格结构的地震响应与结构的固有周期和地震动的频谱特征密切相关。