摘要
为研究陕西省蒲城县崇寿寺塔在地震作用下的损伤机制,依据古塔原位动力测试结果修正结构等效弹性模量,并引入砌体损伤参数确定受拉与受压损伤因子,建立了古塔结构的数值计算模型,按场地条件选择EL-Centro波作为输入地震动,分别按中震及大震要求输入相应峰值的地震波,完成动力计算得到了崇寿寺塔在各工况条件下结构楼层的受拉及受压损伤云图,分析了结构损伤累积的模式。结果表明,中震作用下崇寿寺塔不发生受压损伤,受拉损伤开始于第7层,并逐步往下扩展至第4层;而在大震作用下古塔中轴线部分区域产生受压损伤,受拉损伤开始于第6层并逐步累积并扩展至其它楼层,最终除顶部两层外,其余楼层均发生受拉损伤。由计算结果可见,崇寿寺塔地震损伤模式为中部楼层受拉损伤累积而扩展至其它楼层,从而使结构发生破坏。
The damage mechanism under earthquake is studied for Chongshousi Pagoda lying in Pucheng County,Shaanxi Province,with the equivalent elastic modulus modified based on the in site dynamic test results.Tensile and compressive damage factors are determined based on the masonry damage parameter.Then the numerical model of the pagoda is established.According to site conditions of and the requirement for moderate and strong earthquake,the El-Centro wave is selected as the ground motion with different peak values of the seismic waves input.Through a dynamic analysis,tensile and compressive damage contours are calculated in different cases with the damage accumulation model of the structure analyzed.As results,the compress damages can not appear and the tension damages started at the 7 th floor,then extended to the 4 th floor under a moderate earthquake.Under a strong earthquake,the compress damages emerged in the mid axis area and the tension damages extended from the 6 th floor to other floors,with the floors except the top two floors damaged by tension.The results show that the damage model of Chongshousi Pagoda is the tension in mid floors extending to another floors,thus destroying the structure.
作者
司建辉
李凯
卢俊龙
陈策
李嘉怿
SI Jianhui;LI Kai;LUJunlong;CHEN Ce;LI Jiayi(School of Civil Engineering and Architecture,Xi＇an University of Technology,Xi＇an 710048,China;College of Civil Engineering,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《西安理工大学学报》
CAS
北大核心
2018年第2期153-158,共6页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51778527
51308455)
住房与城乡建设部科技计划资助项目(2014-K2-018)
关键词
砖石古塔
地震损伤
数值分析
masonry pagoda
seismic damage
numerical analysis
