摘要
为研究泰塔纠偏后的动力性能与抗震能力,进行了塔体原位动力测试,采集了地面脉动激励下各楼层结构的振动信号,得到泰塔的动力特性,依据动力特性参数的变化采用柔度曲率法进行古塔损伤识别,确定结构损伤状态;进行结构动力特性数值计算并与测试结果对比,按动力特性的一致性要求确定塔体材料的基本力学参数,引入塑性损伤模型,输入3条地震波进行古塔结构的地震损伤分析。结果表明:泰塔沿东西与南北两个水平方向的前2阶自振频率较为接近,塔体第3层及第6层损伤率略高,受地震作用后塔体损伤首先出现于初始损伤严重的楼层,其损伤累积较其他楼层显著,且最终损伤最为严重;同时,各楼层塔檐及洞口周边易形成贯通裂缝而破坏。研究结果能够为砖石古塔抗震能力评定提供参考。
In order to study the dynamic performance and seismic capacity of the Tai Pagoda after deviation rectification,the in-situ dynamic test of the pagoda was carried out.The vibration signals of each floor excited by the ground pulsation were gathered and the dynamic properties of the pagoda were acquired.Based on the varying of the dynamic characteristic parameters,the flexibility curvature method was used to identify the damage of the ancient pagoda and determine the damage of the structure.The numerical calculations of structural dynamic properties were carried out and compared with the test results.The mechanical parameters of the materials used in the Tai Pagoda were determined according to the consistency of dynamic characteristics.The plastic damage model was introduced and the seismic damage of pagoda's structure was analyzed excited by three seismic waves.As results,the first two vibration frequencies of the pagoda in the east-west and north-south horizontal directions are relatively close,and the damage rate in the third and the sixth floors of the pagoda is slightly higher.The damage of the pagoda's structure first appears on the floor with serious initial damage after the earthquake and the damage accumulation is more significant than that of other floors,and the final damage presents most serious.Penetrating cracks are always occurred along pagoda eaves and surrounding openings that cause the damage of pagoda's structure.The research results can provide references for evaluation to seismic capacity of the ancient masonry pagoda.
作者
卢俊龙
张晨
王振山
贠作义
LU Jun-long;ZHANG Chen;WANG Zhen-shan;YUN Zuo-yi(School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China;Shaanxi Architecture Science Research Institute Co.Ltd.,Xi'an 710082,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2021年第6期1112-1123,共12页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51778527)。
关键词
损伤分析
古砖塔
动力特性
柔度矩阵
刚度退化
damage analysis
ancient masonry pagoda
dynamic properties
flexibility matrix
stiffness degradation
