论文部分内容阅读
为研究“丝绸之路”起点世界文化遗产建筑兴教寺测师塔的动力性能及结构损伤,采用超低频动态测试系统进行了原位动力测试试验.在环境随机激励下,采集了该塔各楼层顶部水平振动的速度响应信号,经滤波后通过积分变换进行自谱及互谱分析,得到了结构沿水平方向的前2阶自振频率与振型.并依据结构测绘结果,建立测师塔数值模型,计算了弹性模量逐渐降低时的振动特性,并与测试结果进行对比,依据结构损伤参数识别的改进形法,进行了测师塔结构损伤分析.结果表明,该塔沿东西与南北两个水平方向的前2阶频率值相近,第1阶振型呈弯曲型,第2阶振型呈弯剪型;与无损砌体弹性模量的取值比较,测师塔结构的等效弹性模量降低较多,其结构整体损伤较为严重.因此,可通过确定无损砌体的弹性模量,采用动力测试及数值计算依据等效弹性模量进行残损砖石古塔结构损伤识别.
In order to study the dynamic performance and structural damage of the tower of the Xingchi Temple, which is the starting point of the world heritage of the “Silk Road”, an in-situ dynamic test was performed using the ultra-low frequency dynamic test system. Under random excitation of the environment, the The velocity response signals of the horizontal vibration at the top of each floor of the tower are filtered and then subjected to the self-spectrum and cross-spectrum analysis through the integral transformation. The first two orders of natural frequencies and modes of the structure along the horizontal direction are obtained. Based on the results of structural mapping, the measurements are established. Based on the numerical model of the division tower, the vibration characteristics of the tower are gradually calculated and compared with the test results. Based on the improved method of identifying the structural damage parameters, the damage analysis of the tower structure of the tower is performed. The results show that the tower along the east and west Compared with the first two orders of frequency in the north and south horizontal directions, the first vibration mode is a curved type, and the second vibration mode is a curved shear type. Compared with the value of the elastic modulus of the non-destructive masonry, the structure of the tower The equivalent elastic modulus decreases more, and its overall structural damage is more severe. Therefore, by determining the elastic modulus of the lossless masonry, dynamic testing and numerical calculations can be used to carry out the damaged masonry ancient tower structure based on the equivalent elastic modulus. Recognition injury.