强震动观测台站类型对地震动的影响分析

以强震动台站结构类型作为控制因素，基于集中质量显式时域动力有限元方法，系统地分析了不同场地条件下观测室结构（砌体观测房、半地下观测室、玻璃钢罩观测室）对地震动的影响。通过对北京地球观象台院内并址观测实验台站捕获的地脉动和两次地震事件数据的处理并结合数值模拟结果，分析得到不同类型观测室对地震动的影响规律。结果表明:观测室结构对地震动的影响是客观存在的，由于观测室结构自振周期和体量不同，不同观测室对地震动的影响频带和影响程度亦存在差异，相较于其它结构对地震动的影响，玻璃钢罩观测室的影响频带较窄、影响程度最小。 

The effect analysis of ground motion station types on ground motion

Based on the concentrated mass explicit dynamic finite element method, we analyzes the effects of different observation house structures on free-field ground motion by taking the observation room structures as the control factor. The analysis models were established by testing the structure types of masonry observation house, semi-underground observation room and glass fiber reinforced plastics cover observation room. Moreover, the fixed observational test was carried out at the strong motion station of the Beijing National Earth Observatory. Based on the test record processing and the numerical simulation, the influence of the observation house structure on ground motion was analyzed. The results show that the influence of the observation room structure on ground motion is objective. Due to the difference of natural vibration period and volume of the observation room structures, the influence frequency band and the influence degree of different observation room on ground motion are also different. Compared with other structures, the influence frequency band of the glass fiber reinforced plastic cover on ground motion is narrow and the influence degree is the least.