Observations made on the response of historical masonry towers during past earthquakes indicate that in addition to the intensity of the ground shaking, the frequency content of shaking also affects the seismic performance of these monuments. To evaluate this phenomenon, the influence of the mean period of the ground motion (T_m), as a frequency content indicator, on the seismic behavior of the towers is assessed. To this end, first, the vulnerability of four towers with different aspect ratios and vibration periods (T_s) are evaluated by means of the Incremental Dynamic Analysis (IDA). For this purpose, 37 ground motion records, corresponding to the stations located in sites with different types of soil, are utilized. The nonlinear time history analyzes of the towers are carried out using the OPENSEES software by means of an Equivalent Beam Element with fiber sections. In order to investigate the effects of the frequency content of the ground motion on the seismic response of the towers, for every tower, the variation of the PGA of the ground motion and the induced internal force in the tower at the point of failure are plotted against the period ratio (T_m/T_s). According to the analysis results, it is found that the failure PGA increases as the period ratio becomes smaller. It is also noted that the induced shear in the tower exhibits a similar trend.

对过去地震中历史性砖石塔的响应进行的观察表明，除了地面震动的强度外，震动的频率含量还影响这些纪念碑的抗震性能。为了评估这种现象，评估了作为频率含量指标的地震动平均周期（T _m）对塔架抗震性能的影响。为此，首先，四个具有不同长宽比和振动周期（T _s）的铁塔的易损性）通过增量动态分析（IDA）进行评估。为此，利用了37个地面运动记录，这些记录对应于位于土壤类型不同的站点中的站点。塔的非线性时程分析是使用OPENSEES软件通过带有纤维截面的等效梁单元进行的。为了研究地震动频率含量对塔架地震响应的影响，对于每座塔架，绘制了地震动PGA的变化以及在故障点处塔架内的内力。相对于周期比（T _m / T _s）。根据分析结果，发现失效PGA随着周期比变小而增加。还应注意的是，塔架中的感应剪力表现出相似的趋势。