（1 西安理工大学土木建筑工程学院， 西安 710048； 2 陕西省建筑科学研究院， 西安 710082； 3 陕西省文物保护研究院， 西安 710075）

［摘要］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。

［关键词］砖石古塔； 动力测试； 动力特性； 结构损伤

中图分类号：TU311-3文献标识码：A文章编号：1002-848X(2017)21-0105-04

Dynamic characteristic test analysis of Jishi Pagoda of Xingjiao Temple

Lu Junlong1, Si Jianhui1, Tian Penggang2, Zhang Wei3

(1 School of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an 710048, China; 2 Institute of Building Science of Shaanxi Province, Xi′an 710082, China; 3 Shaanxi Provincial Institute of Cultural Relics Protection, Xi′an 710075, China)

Abstract:Located in Xingjiao Temple in Xi′an, Shanxi Province in China, Jishi Pagoda is one of the world cultural heritage architecture of the start point of the Silk Road. In order to study the dynamic characteristics and damage state of the pagoda to provide a scientific basis for seismic protection and reinforcement, ultra-low frequency power test system was applied to in-situ dynamic test for the pagoda. The speed and displacement signals of pagoda vibration were obtained under the action of pulsating on the ground. The spectrum analysis was conducted on velocity signal to obtain the vibration frequency of Jishi Pagoda. Numerical calculation model of the pagoda was established using finite element software ANSYS, to calculate dynamical characteristics of pagoda. The calculation results and test results were compared to evaluate structural damage of the pagoda. The results show that the first-order vibration frequencies along the east-west direction and the north-south direction are closer, and the bottom hole of the pagoda has a slight impact on its vibration frequency, and the macro damage is more serious. It is appropriate to do further damage testing and analysis.

Keywords:masonry pagoda; dynamical test; dynamical character; structure damage

*国家自然科学基金资助项目（51308455），陕西省自然科学基础研究计划资助项目（2015JM5206），住房与城乡建设部科技计划项目（2014-K2-018）和陕西省博士后科学基金资助项目。

作者简介：卢俊龙，博士，副教授，硕士生导师，Email：lujunlong@sohu.com。