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基师塔位于陕西省西安市兴教寺内,是“丝绸之路”起点世界文化遗产建筑之一。为了研究基师塔的动力特性及损伤状况,为其抗震保护及加固修复提供科学依据,应用超低频动力测试系统对该塔进行了原位动力测试试验,采集了在地面脉动作用下古塔结构振动的速度及位移信号,对速度信号进行自谱分析,得到了基师塔的振动频率。应用有限元软件ANSYS建立了基师塔的数值计算模型,计算了古塔的动力特性,将计算结果与测试结果进行对比,评定了基师塔的结构损伤。结果表明,基师塔沿东西方向与南北方向第1阶振动频率较为接近,塔底底层开洞对其振动频率略有影响,宏观损伤较为严重,宜做进一步的损伤测试与分析。
The base tower is located in Xing’an Temple, Xi’an City, Shaanxi Province, and is one of the World Cultural Heritage buildings starting from “Silk Road”. In order to study the dynamic characteristics and damage status of the base tower, provide a scientific basis for its seismic protection and reinforcement and repair, and apply the ultra-low frequency dynamic test system to in-situ dynamic test of the tower, and collect the ancient tower structure under the action of ground pulsation Vibration speed and displacement signal, the velocity signal of self-spectrum analysis, the base tower vibration frequency. The finite element software ANSYS was used to establish the numerical calculation model of the base tower. The dynamic characteristics of the ancient tower were calculated. The calculated results were compared with the test results to evaluate the structural damage of the base tower. The results show that the vibration frequency of the first tower along the east-west direction is relatively close to that of the north-south direction. The opening at the bottom of the tower has a slight impact on its vibration frequency. The macro damage is more serious and should be further tested and analyzed.