摘要
为测定单层球面网壳模型振动台实验时的动力特性,进行噪声采集实验,剔除对实验干扰较大的各种环境噪声。通过模型在各种不同幅值白噪声及快速正弦扫频作用下动力响应确定实验所需测试幅值,测定模型的动力特性。通过锤击测定结构动力特性,并通过随机减量技术与HHT相结合方法对锤击结果进行分析。实验结果表明:网壳结构频率密集,各种环境噪声对实验结果干扰较大,应剔除环境噪声影响;采用快速正弦扫频、白噪声激励、锤击法均可准确测定结构的动力特性且结果相差不大。采用有限元软件ABAQUS对实验进行数值模拟,与实验结果对比分析表明,建模精确,有限元模拟可准确确定结构的动力特性。此可为模型振动台实验及结构抗震性能研究奠定基础。
In order to measure dynamic characteristics of a single-layer reticulated dome model during shaking table test, firstly the acquisition of noise was performed to eliminate various environment noises with bigger interferences in shaking table test. Then, the dynamic responses of the model under the actions of white noise and the fast sine sweeping with different amplitudes were used to datermine the response amplitude to be measured for the test and the dynamic characteristics of the model. In addition, the hammering method was also used to measure the dynamic characteristics of the model, its results were analyzed using the random decrement technique combined with HHT method. It was shown from the test results that the modal frequencies of a single-layer reticulated dome are intensive and the environment noise interference must be eliminated for their large effect on the test results; the results of the dynamic characteristics of the model are almost identical using the above mentioned three methods. Finite element simulation for the dynamic characteristics of the model with ABAQUS was completed. Comparing results showed that the numerical results are in good agreement with the test results, so the dynamic characteristics of the model can be accurately simulated using ABAQUS based on an accurate FE model. All the results provided a foundation for the further shaking table test and aseismic performance study of reticulated shells.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第22期200-204,共5页
Journal of Vibration and Shock
基金
中国地震局工程力学研究所基本科研业务费专项资助(2013B12)
基于多性态需求的结构地震安全关键技术研究(2012DFA70810)
关键词
单层球面网壳
动力特性测试
白噪声激励
快速正弦扫频
锤击法
数值模拟
single-layer reticulated dome
dynamic characteristics measurement
white noise excitation
fast sinesweeping
hammering method
numerical simulation
