摘要
为了研究内蒙古呼和浩特市慈灯寺金刚宝座塔的动力特性,应用动态测试系统对该塔在环境激励下的振动响应进行了测试,通过时域及频域分析得到金刚宝座上五座小塔的自振频率及振型;并建立数值模型计算结构的动力特性,通过调整计算参数,使计算结果与测试结果一致,进而对动力特性进行分析。结果表明:角部四塔结构的前2阶自振频率测试结果基本接近,但均略低于中塔的自振频率,各塔前2阶振型曲线形状相似,但振型坐标略有区别;数值计算时设置金刚宝座后,各小塔振动频率计算结果降低,振型坐标增大。因此各小塔结构质量及刚度沿高度的分布规律基本一致,但因各塔结构损伤状况不同,引起局部刚度削弱,各自振型坐标及阻尼略有区别,同时金刚座对古塔动力特性的计算结果有一定影响。
To study the dynamic characters of the vajre throne pagoda of Cideng Temple in Hohhot,Inner Mongolia Autonomous Region,the vibration response of the pagoda is test excited by ground random on dynamical test equipments.The vibration frequencies and modes of five towers above the vajre are acquired by analysis in time domain and frequency domain.The numerical model is built for the calculation of the dynamical characters of the structures,with the results being consistent with those of the test by adapting to the parameters and the dynamical characters being analyzed.As results,the first two stage vibration frequencies are nearly among the four pagodas at the corner but they are fewer than those of the middle pagoda.The first two stage vibration mode curves are similar and the vibration mode coordination values appear in a different way.When the vajre is considered to be in simulation calculation,the frequencies of each pagoda are reduced while the mode coordination values are increased.Therefore,the distribution of mass and stiffness of each pagoda is consistent along with height,and however the vibration mode coordinate values and damp are influenced by local weaken stiffness because of the differences in structural damage to each pagoda.Nevertheless the vajre throne is effected to the results of dynamical characters of the pagoda.
出处
《西安理工大学学报》
CAS
北大核心
2017年第1期7-12,共6页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51308455)
陕西省自然科学基金资助项目(2015JM5206)
住房与城乡建设部科技计划项目(2014-K2-018)
陕西省博士后基金资助项目
西安理工大学科学研究计划资助项目(2015CX018)
关键词
金刚宝座塔
砖石古塔
动力特性
数值模拟
vajra throne pagoda
masonry pagoda
dynamical character
numerical simulation
