ABSTRACT

To study the dynamic characteristics and seismic damage of the Bayun Pagoda,the dynamic characteristics are determined via an in-situ dynamic test, and the flexibility curvature method is used to identify the damage. Moreover, the numerical calculation results of the dynamic characteristics are compared with the test results. The mechanical parameters of the materials are determined in the consistency of the dynamic characteristics, and a plastic damage model is also introduced. From the vertical compressive stress the initial damage is defined, and the seismic damage is analyzed by inputting El-Centro, Taft, and Lanzhou artificial wave. As results, the first-order natural frequencies are close to each other in the horizontal East-West and North-South directions, and the initial damage rates of the 6th, 8th, 10th floors are higher. The distributions of the principal tensile stress excited by different seismic are similarbut the distributions of seismic damage are slightly different; the area with serious seismic damage is in the middle and bottom floors, and the damage accumulation of the first floor is more obvious than those of the other floors. Moreover, the outer edge of each floor, the pagoda eaves, and the periphery of the archway are found to be easily damaged.

摘要

为研究巴云塔的动力特性和地震破坏，通过原位动力试验确定动力特性，并采用柔度曲率法进行破坏识别。此外，将动态特性的数值计算结果与试验结果进行了比较。在动力学特性的一致性中确定了材料的力学参数，并引入了塑性损伤模型。从垂直压应力定义初始损伤，并通过输入El-Centro、Taft和Lanzhou人工波对地震损伤进行分析。结果，水平东西向和南北向一阶固有频率接近，6、8、10层的初始损伤率较高。不同地震激发的主拉应力分布相似，但地震损伤分布略有不同；地震破坏严重的区域在中层和底层，一层的破坏积累比其他楼层更明显。此外，还发现每层外缘、塔檐、牌楼外围都容易损坏。