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为了研究倾斜砖石古塔的动力性能及其随机振动规律,依据虚拟激励法及场地振动特性,综合考虑结构及激励的随机性,对陕西省旬邑县泰塔在倾斜矫正施工期间进行了随机动力响应分析。计算了各楼层速度及加速度响应的自功率谱,给出了结构振动的前2阶自振频率;并进行了各楼层响应与地面振动的互功率谱及频响函数分析,研究了楼层随机动力响应与地面随机振动输入及结构振动的关系。结果表明:地面随机振动加速度对底部楼层影响较为显著,而速度响应则是在顶部楼层较为明显,且随着楼层高度增加,结构自振动力响应逐渐显著。因此,进行古塔结构振动测试及随机振动分析应依据研究目的确定测点位置及所采集信号类型。
In order to study the dynamic behavior of inclined pagoda pagoda and its random vibration law, based on the virtual excitation method and the site vibration characteristics, taking into account the randomness of the structure and excitation, Taita, Xunyi County, Shaanxi Province was randomly selected Dynamic response analysis. The self-power spectra of velocity and acceleration response of each floor are calculated, and the first two natural frequencies of the structure vibration are given. The mutual power spectrum and frequency response function of floor response and ground vibration are also analyzed. Response to Ground Random Vibration Input and Structural Vibration. The results show that the ground random vibration acceleration has more significant effect on the bottom floor, while the velocity response is more obvious on the top floor. With the increase of the floor height, the self-vibration dynamic response of the structure becomes noticeable. Therefore, the structure of the ancient tower vibration test and random vibration analysis should be based on research purposes to determine the location of the measured points and the type of signal collected.