基于分离式建模的砖石古塔动力性能与响应分析  

Dynamic performance and response analysis of brick-and-stone ancient tower based on separated modeling

作　　者：卢俊龙 周谦祥 田鹏刚 王振山[1] 田建勃 LU Jun-long;ZHOU Qian-xiang;TIAN Peng-gang;WANG Zhen-shan;TIAN Jian-bo(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;Shanxi Architecture Science Research Institute Co.,Ltd.,Xi’an 710082,China)

机构地区：[1]西安理工大学,西安710048 [2]陕西省建筑科学研究院有限公司,西安710082

出　　处：《计算力学学报》2023年第5期739-748,共10页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(51778527);陕西省自然科学基础研究计划(2021JM-435);陕西省重点研发计划(2022SF-376)资助项目。

摘　　要：为研究砖石古塔的动力特性及地震响应机制,以渭南慧照寺塔为对象,采用块体-灰浆分区离散方法,分别建立刚性地基条件与考虑地基-结构相互作用条件下古塔的数值模型,计算比较了塔体的动力特性;并分别按9度小震、中震和大震输入El-Centro波、Taft波和兰州人工波,计算了结构的位移和加速度反应,与相互作用系统进行比较。结果表明,考虑土-结构相互作用后,古塔结构的一阶自振频率降低5.7%,二阶频率降低45%;El-Centro波和Taft波作用下,位移和加速度响应显著增大,大震作用时,与不考虑土-结构相互作用对比,主拉应力峰值显著增加,古塔从灰浆开裂发展为砖与灰浆同时开裂;兰州人工波作用下,考虑土-结构相互作用后,主拉应力和结构开裂变形反而降低。研究结果可为古塔抗震计算与性能评估提供参考。In order to study the dynamic characteristics and seismic response mechanism of ancient masonry pagodas,taking Huizhao Temple pagoda in Weinan as an example,the block-lime slurry partition discrete method was used to establish the numerical models of ancient pagodas under rigid foundation conditions and considering foundation-structure interaction,and the dynamic characteristics of the pagoda were calculated and compared.The El-Centro wave,Taft wave and artificial Lanzhou wave were the inputs according to the 9-degree small earthquake,medium earthquake and large earthquake,respectively,and the displacement and acceleration responses of the structure were calculated and compared with the interaction system.The results show that after considering the soil-structure interaction,the first-order natural frequency of the ancient tower structure is reduced by 5.7%,and the second-order frequency is reduced by 45%.Under the action of El-Centro wave and Taft wave,the displacement and acceleration responses increased significantly.Under the action of large earthquakes,compared with and without considering the soil-structure interaction,the peak value of the principal tensile stress increased significantly,and the ancient tower cracked from mortar to brick and mortar simultaneously.Under the action of the artificial Lanzhou wave,after considering the soil-structure interaction,the main tensile stress and cracking deformation decrease instead.The research results can provide a reference for seismic calculation and capacity evaluation of masonry pagodas.

关 键 词：砖石古塔 土与结构相互作用 动力响应 抗震性能 数值模型 

分 类 号：TU365[建筑科学—结构工程] O302[理学—力学]