中文摘要：

古塔的自振周期是古塔损伤程度评价和抗震分析的重要参数。本文依据结构动力学基本理论和古塔动力特性实测数据,以砌体的材料性能、塔身厚度、塔身截面形状、塔身开洞率等关键参数为指标,通过古塔基本周期的理论分析和计算机模拟,提出了基于弯曲悬臂杆模型的四系数简化计算公式。按照该公式对14座典型砖石古塔的基本周期进行了计算,并与现场实测值做了对比,表明该公式计算精度满足工程要求,可用于多种类型砖石古塔的动力特性估算。

英文摘要：

Natural vibration period of structure is an important parameter of the seismic analysis and evaluation of damaged degree of ancient pagodas. According to the basic theory of structural dynamics and the test data of dy- namic behavior of ancient shape and ratio of holes of masonry pagodas pagoda , this research selects the material property, body thickness, section as the target parameters of theoretical analysis and computer simulation, and pro- poses a four coefficients simplified calculation formula of fundamental period of masonry pagodas on the basis of the model of bending cantilever column. A comparison between the calculation results and test data of the fundamental periods of 14 masonry pagodas indicates that the simplified formula meets the requirement of engineering accuracy and can be applied to the dynamic behavior estimation of ancient masonry pagodas.