摘要
为研究中国古城楼建筑准确的有限元建模方法,从而给该类型建筑遗产的结构计算提供理论依据,本文以南京鼓楼建筑为例,基于现场动力特性测试结果对该城楼建筑的有限元计算模型进行修正.首先建立了不考虑城台和围护墙结构效应的城楼建筑有限元计算模型,将数值计算结果与现场动力特性测试结果进行比较分析,从而提出考虑城台结构效应及考虑围护墙结构效应共3种有限元计算修正模型,通过对这3种修正模型计算结果与现场动力特性测试结果的比较分析,选择出适合该建筑结构分析的最优修正模型.研究结果表明:考虑城台后的修正模型自振频率略有下降,但均在1%以内,故利用固有频率对该类建筑进行模型修正时,可以不考虑城台的影响;在考虑围护墙结构效应的两种修正模型中,整体墙元模型计算结果与动力特性测试结果误差在2%以内,是较为精确的模型,而等效斜撑模型模拟的计算误差则在45%左右.研究结果可为同类型古城楼建筑的结构计算模型修正提供依据.
In order to develop accurate finite element(FE)model of city gate tower in China for further structural analysis,Nanjing Drum Tower was studied as an example.The FE model of this building was modified by the results of the structural dynamical characteristic test.First,the FE model without considering city gate effect and infilled wall effect was established to analyze the dynamical characteristics.Then,the structural dynamical characteristic test was carried out on site.Through comparison of test results and the calculation results of unmodified FE model,three modified models considering city gate effect and infilled wall effect were put forward,and the calculation results of these three modified models were also compared with the results of the structural dynamical characteristic test.The best modified model which is suitable for this type of heritages was found out eventually.The study results show that:Firstly,the natural vibration frequencies of the model considering city gate effect decrease within 1%compared with the unmodified FE model.Thus,the city gate effect can be ignored when nature frequencies are used to make model updating.Secondly,in the two methods considering infilled wall effect,the result of the integral simplified model is numerically closer to the dynamical test result,and the error is less than 2%,while the error of the results of the equivalent diagonal strut model and the dynamical test is about 45%.The results can provide the scientific basis for the structural computing model modification of the similar ancient city gate towers.
作者
华一唯
淳庆
郭华瑜
HUA Yiwei;CHUN Qing;GUO Huayu(School of Architecture,Southeast University,Nanjing 210096,China;School of Architecture,Nanjing Tech University,Nanjing 211800,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2020年第2期407-421,共15页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51778122,51578127)
关键词
城楼
木构建筑
结构模型修正
结构动力特性
围护墙
整体墙元模型
等效斜撑模型
city gate tower
wooden buildings
FE model
structural dynamical characteristic
infilled wall
integral simplified model
equivalent diagonal strut
